Initial commit

.gitignore

+.DS_Store
+.dart_tool/
+.idea
+.packages
+.pub/
+
+build/

.gradle/buildOutputCleanup/cache.properties

+#Thu May 09 15:59:56 ICT 2019
+gradle.version=5.1.1

.metadata

+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: 7a4c33425ddd78c54aba07d86f3f9a4a0051769b
+  channel: stable
+
+project_type: plugin

CHANGELOG.md

+## 1.1.8
+* Fix bug on ios build
+
+## 1.1.7
+
+* dartdoc comments and Dart formatter
+
+## 1.1.6
+
+* Add print3Column method
+* Add print4Column method
+* Support format string
+
+## 1.1.5
+
+* Migrate to Android embedding v2
+
+## 1.1.4
+
+* Fix Error Null-Safety
+
+## 1.1.3
+
+* Fix Cast Error on getBondedDevices
+
+## 1.1.2
+
+* Migrate to null-safety
+
+## 1.1.1
+
+* Support different charset in print methods, thanks to danilof
+
+## 1.1.0
+
+* Add print image bytes method, thanks to mvanvu
+
+## 1.0.9
+
+* Avoiding activity null pointer, thanks to wmattei
+
+## 1.0.8
+
+* fix crash with "Methods marked with @UiThread must be executed on the main thread, thanks to ricardochen
+
+## 1.0.7
+
+* change documentation
+
+## 1.0.6
+
+* add size to printleftright
+
+## 1.0.5
+
+* fix bug
+
+## 1.0.4
+
+* fix bug
+
+## 1.0.3
+
+* Add print left + right
+
+## 1.0.2
+
+* Add Endline in QRCODE
+
+## 1.0.1
+
+* Add Doc.
+
+## 1.0.0
+
+* initial release.

LICENSE

+THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS COMMON PUBLIC
+LICENSE ("AGREEMENT"). ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM
+CONSTITUTES RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
+
+1. DEFINITIONS
+
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+
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+documentation distributed under this Agreement, and
+
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+
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+
+    ii) additions to the Program;
+
+    where such changes and/or additions to the Program originate from and are
+distributed by that particular Contributor. A Contribution 'originates' from a
+Contributor if it was added to the Program by such Contributor itself or anyone
+acting on such Contributor's behalf. Contributions do not include additions to
+the Program which: (i) are separate modules of software distributed in
+conjunction with the Program under their own license agreement, and (ii) are not
+derivative works of the Program.
+
+"Contributor" means any person or entity that distributes the Program.
+
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+necessarily infringed by the use or sale of its Contribution alone or when
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+
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+When the Program is made available in source code form:
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+    a) it must be made available under this Agreement; and
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+
+4. COMMERCIAL DISTRIBUTION
+
+Commercial distributors of software may accept certain responsibilities with
+respect to end users, business partners and the like. While this license is
+intended to facilitate the commercial use of the Program, the Contributor who
+includes the Program in a commercial product offering should do so in a manner
+which does not create potential liability for other Contributors. Therefore, if
+a Contributor includes the Program in a commercial product offering, such
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+5. NO WARRANTY
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+EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, THE PROGRAM IS PROVIDED ON AN
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER EXPRESS OR
+IMPLIED INCLUDING, WITHOUT LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE,
+NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each
+Recipient is solely responsible for determining the appropriateness of using and
+distributing the Program and assumes all risks associated with its exercise of
+rights under this Agreement, including but not limited to the risks and costs of
+program errors, compliance with applicable laws, damage to or loss of data,
+programs or equipment, and unavailability or interruption of operations.
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+6. DISCLAIMER OF LIABILITY
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+EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, NEITHER RECIPIENT NOR ANY
+CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING WITHOUT LIMITATION LOST
+PROFITS), HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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+OUT OF THE USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS
+GRANTED HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
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+
+If any provision of this Agreement is invalid or unenforceable under applicable
+law, it shall not affect the validity or enforceability of the remainder of the
+terms of this Agreement, and without further action by the parties hereto, such
+provision shall be reformed to the minimum extent necessary to make such
+provision valid and enforceable.
+
+If Recipient institutes patent litigation against a Contributor with respect to
+a patent applicable to software (including a cross-claim or counterclaim in a
+lawsuit), then any patent licenses granted by that Contributor to such Recipient
+under this Agreement shall terminate as of the date such litigation is filed. In
+addition, if Recipient institutes patent litigation against any entity
+(including a cross-claim or counterclaim in a lawsuit) alleging that the Program
+itself (excluding combinations of the Program with other software or hardware)
+infringes such Recipient's patent(s), then such Recipient's rights granted under
+Section 2(b) shall terminate as of the date such litigation is filed.
+
+All Recipient's rights under this Agreement shall terminate if it fails to
+comply with any of the material terms or conditions of this Agreement and does
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+No one other than the Agreement Steward has the right to modify this Agreement.
+IBM is the initial Agreement Steward. IBM may assign the responsibility to serve
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+Agreement will be given a distinguishing version number. The Program (including
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+under which it was received. In addition, after a new version of the Agreement
+is published, Contributor may elect to distribute the Program (including its
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+2(a) and 2(b) above, Recipient receives no rights or licenses to the
+intellectual property of any Contributor under this Agreement, whether
+expressly, by implication, estoppel or otherwise. All rights in the Program not
+expressly granted under this Agreement are reserved.
+
+This Agreement is governed by the laws of the State of New York and the
+intellectual property laws of the United States of America. No party to this
+Agreement will bring a legal action under this Agreement more than one year
+after the cause of action arose. Each party waives its rights to a jury trial in
+any resulting litigation.
\ No newline at end of file

README.md

+# blue_thermal_printer
+
+https://pub.dev/packages/blue_thermal_printer
+
+A new Flutter plugin for connecting to thermal printer via bluetooth
+(Android Only),
+this plugin is still under development
+Note: Migrate your project to AndroidX
+
+## Getting Started
+
+1. Depend on it
+
+Add this to your package's pubspec.yaml file:
+
+    dependencies:
+      blue_thermal_printer: ^any
+
+2. Install it
+
+You can install packages from the command line:
+
+with Flutter:
+
+    $ flutter packages get
+
+Alternatively, your editor might support flutter packages get. Check the docs for your editor to learn more.
+3. Import it
+
+Now in your Dart code, you can use:
+
+     import 'package:blue_thermal_printer/blue_thermal_printer.dart';
+
+
+EXAMPLE:
+
+    import 'dart:io';
+    import 'dart:typed_data';
+    import 'package:flutter/material.dart';
+    import 'dart:async';
+    import 'package:blue_thermal_printer/blue_thermal_printer.dart';
+    import 'package:flutter/services.dart';
+    import 'package:path_provider/path_provider.dart';
+
+    void main() => runApp(new MyApp());
+
+    class MyApp extends StatefulWidget {
+     @override
+     _MyAppState createState() => new _MyAppState();
+    }
+
+    class _MyAppState extends State<MyApp> {
+
+      BlueThermalPrinter bluetooth = BlueThermalPrinter.instance;
+
+      List<BluetoothDevice> _devices = [];
+      BluetoothDevice _device;
+      bool _connected = false;
+      bool _pressed = false;
+      String pathImage;
+
+      @override
+      void initState() {
+       super.initState();
+       initPlatformState();
+       initSavetoPath();
+      }
+
+     initSavetoPath()async{
+        //read and write
+        //image max 300px X 300px
+        final filename = 'yourlogo.png';
+        var bytes = await rootBundle.load("assets/images/yourlogo.png");
+        String dir = (await getApplicationDocumentsDirectory()).path;
+        writeToFile(bytes,'$dir/$filename');
+        setState(() {
+         pathImage='$dir/$filename';
+       });
+     }
+
+
+      Future<void> initPlatformState() async {
+        List<BluetoothDevice> devices = [];
+
+       try {
+         devices = await bluetooth.getBondedDevices();
+       } on PlatformException {
+         // TODO - Error
+       }
+
+       bluetooth.onStateChanged().listen((state) {
+         switch (state) {
+            case BlueThermalPrinter.CONNECTED:
+              setState(() {
+                _connected = true;
+                _pressed = false;
+             });
+             break;
+            case BlueThermalPrinter.DISCONNECTED:
+             setState(() {
+               _connected = false;
+               _pressed = false;
+              });
+             break;
+            default:
+              print(state);
+              break;
+         }
+       });
+
+        if (!mounted) return;
+       setState(() {
+          _devices = devices;
+       });
+      }
+
+     @override
+     Widget build(BuildContext context) {
+        return MaterialApp(
+          home: Scaffold(
+            appBar: AppBar(
+              title: Text('Blue Thermal Printer'),
+           ),
+            body: Container(
+             child: ListView(
+               children: <Widget>[
+                 Padding(
+                   padding: const EdgeInsets.fromLTRB(10.0, 10.0, 10.0, 0.0),
+                   child: Row(
+                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
+                     children: <Widget>[
+                       Text(
+                          'Device:',
+                         style: TextStyle(
+                            fontWeight: FontWeight.bold,
+                         ),
+                        ),
+                       DropdownButton(
+                          items: _getDeviceItems(),
+                          onChanged: (value) => setState(() => _device = value),
+                          value: _device,
+                       ),
+                       RaisedButton(
+                          onPressed:
+                         _pressed ? null : _connected ? _disconnect : _connect,
+                          child: Text(_connected ? 'Disconnect' : 'Connect'),
+                        ),
+                     ],
+                   ),
+                 ),
+                  Padding(
+                    padding: const EdgeInsets.only(left: 10.0, right: 10.0, top: 50),
+                    child:  RaisedButton(
+                      onPressed: _connected ? _tesPrint : null,
+                     child: Text('TesPrint'),
+                   ),
+                 ),
+                ],
+             ),
+            ),
+         ),
+       );
+     }
+
+
+      List<DropdownMenuItem<BluetoothDevice>> _getDeviceItems() {
+        List<DropdownMenuItem<BluetoothDevice>> items = [];
+       if (_devices.isEmpty) {
+         items.add(DropdownMenuItem(
+           child: Text('NONE'),
+         ));
+        } else {
+         _devices.forEach((device) {
+           items.add(DropdownMenuItem(
+            child: Text(device.name),
+              value: device,
+           ));
+         });
+       }
+       return items;
+      }
+
+
+     void _connect() {
+        if (_device == null) {
+         show('No device selected.');
+       } else {
+          bluetooth.isConnected.then((isConnected) {
+           if (!isConnected) {
+              bluetooth.connect(_device).catchError((error) {
+               setState(() => _pressed = false);
+             });
+             setState(() => _pressed = true);
+           }
+          });
+        }
+     }
+
+
+      void _disconnect() {
+        bluetooth.disconnect();
+        setState(() => _pressed = true);
+     }
+
+    //write to app path
+     Future<void> writeToFile(ByteData data, String path) {
+        final buffer = data.buffer;
+        return new File(path).writeAsBytes(
+            buffer.asUint8List(data.offsetInBytes, data.lengthInBytes));
+     }
+
+      void _tesPrint() async {
+        //SIZE
+        // 0- normal size text
+        // 1- only bold text
+        // 2- bold with medium text
+        // 3- bold with large text
+        //ALIGN
+        // 0- ESC_ALIGN_LEFT
+        // 1- ESC_ALIGN_CENTER
+        // 2- ESC_ALIGN_RIGHT
+        bluetooth.isConnected.then((isConnected) {
+        if (isConnected) {
+            bluetooth.printNewLine();
+            bluetooth.printCustom("HEADER",3,1);
+            bluetooth.printNewLine();
+            bluetooth.printImage(pathImage);   //path of your image/logo
+            bluetooth.printNewLine();
+            //bluetooth.printImageBytes(bytes.buffer.asUint8List(bytes.offsetInBytes, bytes.lengthInBytes));
+            bluetooth.printLeftRight("LEFT", "RIGHT",0);
+            bluetooth.printLeftRight("LEFT", "RIGHT",1);
+            bluetooth.printLeftRight("LEFT", "RIGHT",1,format: "%-15s %15s %n");
+            bluetooth.printNewLine();
+            bluetooth.printLeftRight("LEFT", "RIGHT",2);
+            bluetooth.printLeftRight("LEFT", "RIGHT",3);
+            bluetooth.printLeftRight("LEFT", "RIGHT",4);
+            bluetooth.printNewLine();
+            bluetooth.print3Column("Col1", "Col2", "Col3",1);
+            bluetooth.print3Column("Col1", "Col2", "Col3",1,format: "%-10s %10s %10s %n");
+            bluetooth.printNewLine();
+            bluetooth.print4Column("Col1","Col2","Col3","Col4",1);
+            bluetooth.print4Column("Col1","Col2","Col3","Col4",1,format: "%-8s %7s %7s %7s %n" );
+            bluetooth.printNewLine();
+            String testString = " čĆžŽšŠ-H-ščđ";
+            bluetooth.printCustom(testString, 1, 1, charset: "windows-1250");
+            bluetooth.printLeftRight("Številka:", "18000001", 1, charset: "windows-1250");
+            bluetooth.printCustom("Body left",1,0);
+            bluetooth.printCustom("Body right",0,2);
+            bluetooth.printNewLine();
+            bluetooth.printCustom("Thank You",2,1);
+            bluetooth.printNewLine();
+            bluetooth.printQRcode("Insert Your Own Text to Generate", 200, 200, 1);
+            bluetooth.printNewLine();
+            bluetooth.printNewLine();
+            bluetooth.paperCut();
+            }
+       });
+      }
+
+
+     Future show(
+          String message, {
+           Duration duration: const Duration(seconds: 3),
+          }) async {
+        await new Future.delayed(new Duration(milliseconds: 100));
+       Scaffold.of(context).showSnackBar(
+          new SnackBar(
+            content: new Text(
+              message,
+             style: new TextStyle(
+                color: Colors.white,
+              ),
+           ),
+            duration: duration,
+          ),
+        );
+     }
+    }
+
+
+If you like my content, please consider buying me a coffee. Thank you for your support!
+
+
+[![ko-fi](https://ko-fi.com/img/githubbutton_sm.svg)](https://ko-fi.com/Z8Z6656JW)
+
+<a href="https://www.buymeacoffee.com/QP1rCmf5L" target="_blank"><img src="https://www.buymeacoffee.com/assets/img/custom_images/orange_img.png" alt="Buy Me A Coffee" style="height: 41px !important;width: 174px !important;box-shadow: 0px 3px 2px 0px rgba(190, 190, 190, 0.5) !important;-webkit-box-shadow: 0px 3px 2px 0px rgba(190, 190, 190, 0.5) !important;" ></a>

analysis_options.yaml

+include: package:flutter_lints/flutter.yaml
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options

android/.gitignore

+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.DS_Store
+/build
+/captures

android/build.gradle

+group 'id.kakzaki.blue_thermal_printer'
+version '1.1.3'
+
+buildscript {
+    repositories {
+        google()
+        jcenter()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.5.0'
+    }
+}
+
+rootProject.allprojects {
+    repositories {
+        google()
+        jcenter()
+        maven { url 'https://jitpack.io' }
+        mavenCentral()
+    }
+}
+
+apply plugin: 'com.android.library'
+
+android {
+    compileSdkVersion 30
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    defaultConfig {
+        minSdkVersion 18
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+    lintOptions {
+        disable 'InvalidPackage'
+    }
+    buildToolsVersion '29.0.2'
+}
+dependencies {
+    implementation 'androidx.appcompat:appcompat:1.0.2'
+    implementation 'com.google.zxing:core:3.3.3'
+    implementation 'com.android.support:multidex:1.0.3'
+    implementation 'com.journeyapps:zxing-android-embedded:3.6.0@aar'
+    implementation 'com.github.bingoogolapple.BGAQRCode-Android:zxing:1.3.8'
+    implementation 'com.blankj:utilcode:1.30.1'
+    implementation files('libs/gprintersdkv2.jar')
+}

android/gradle.properties

+org.gradle.jvmargs=-Xmx1536M
+

android/settings.gradle

+rootProject.name = 'blue_thermal_printer'

android/src/main/AndroidManifest.xml

+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="id.kakzaki.blue_thermal_printer">
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
+    <!-- Request legacy Bluetooth permissions on older devices. -->
+    <uses-permission android:name="android.permission.BLUETOOTH"
+        tools:remove="android:maxSdkVersion" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"
+        tools:remove="android:maxSdkVersion" />
+
+    <!-- Needed only if your app looks for Bluetooth devices.
+         You must add an attribute to this permission, or declare the
+         ACCESS_FINE_LOCATION permission, depending on the results when you
+         check location usage in your app. -->
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
+    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
+
+    <!-- Needed only if your app makes the device discoverable to Bluetooth
+         devices. -->
+    <uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />
+
+    <!-- Needed only if your app communicates with already-paired Bluetooth
+         devices. -->
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
+
+</manifest>

android/src/main/java/id/kakzaki/blue_thermal_printer/BlueThermalPrinterPlugin.java

+package id.kakzaki.blue_thermal_printer;
+
+import android.Manifest;
+import android.app.Activity;
+import android.app.Application;
+import android.bluetooth.BluetoothAdapter;
+import android.bluetooth.BluetoothDevice;
+import android.bluetooth.BluetoothManager;
+import android.bluetooth.BluetoothSocket;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.pm.PackageManager;
+
+import androidx.annotation.NonNull;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.util.Base64;
+import android.util.Log;
+import android.os.AsyncTask;
+import android.os.Handler;
+import android.os.Looper;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+
+import cn.bingoogolapple.qrcode.zxing.QRCodeEncoder;
+import io.flutter.embedding.engine.plugins.FlutterPlugin;
+import io.flutter.embedding.engine.plugins.activity.ActivityAware;
+import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding;
+import io.flutter.plugin.common.BinaryMessenger;
+import io.flutter.plugin.common.EventChannel;
+import io.flutter.plugin.common.EventChannel.StreamHandler;
+import io.flutter.plugin.common.EventChannel.EventSink;
+import io.flutter.plugin.common.MethodCall;
+import io.flutter.plugin.common.MethodChannel;
+import io.flutter.plugin.common.MethodChannel.MethodCallHandler;
+import io.flutter.plugin.common.MethodChannel.Result;
+import io.flutter.plugin.common.PluginRegistry;
+import io.flutter.plugin.common.PluginRegistry.Registrar;
+import io.flutter.plugin.common.PluginRegistry.RequestPermissionsResultListener;
+
+import com.google.zxing.BarcodeFormat;
+import com.google.zxing.MultiFormatWriter;
+import com.google.zxing.WriterException;
+import com.google.zxing.common.BitMatrix;
+import com.gprinter.command.LabelCommand;
+import com.journeyapps.barcodescanner.BarcodeEncoder;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+
+import com.blankj.utilcode.util.LogUtils;
+
+public class BlueThermalPrinterPlugin implements FlutterPlugin, ActivityAware, MethodCallHandler, RequestPermissionsResultListener {
+
+    private static final String TAG = "BThermalPrinterPlugin";
+    private static final String NAMESPACE = "blue_thermal_printer";
+    private static final int REQUEST_COARSE_LOCATION_PERMISSIONS = 1451;
+    private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
+    private static ConnectedThread THREAD = null;
+    private BluetoothAdapter mBluetoothAdapter;
+    private ExecutorService executorService;
+
+    private Result pendingResult;
+
+    private EventSink readSink;
+    private EventSink statusSink;
+
+    private FlutterPluginBinding pluginBinding;
+    private ActivityPluginBinding activityBinding;
+    private Object initializationLock = new Object();
+    private Context context;
+    private MethodChannel channel;
+
+    private EventChannel stateChannel;
+    private EventChannel readChannel;
+    private BluetoothManager mBluetoothManager;
+
+    private Application application;
+    private Activity activity;
+    private String lastDevice = "";
+//    private Handler handler;
+
+    public static void registerWith(Registrar registrar) {
+        final BlueThermalPrinterPlugin instance = new BlueThermalPrinterPlugin();
+        //registrar.addRequestPermissionsResultListener(instance);
+        Activity activity = registrar.activity();
+        Application application = null;
+        instance.setup(registrar.messenger(), application, activity, registrar, null);
+
+    }
+
+    public BlueThermalPrinterPlugin() {
+    }
+
+    @Override
+    public void onAttachedToEngine(@NonNull FlutterPluginBinding binding) {
+        pluginBinding = binding;
+    }
+
+    @Override
+    public void onDetachedFromEngine(@NonNull FlutterPluginBinding binding) {
+        pluginBinding = null;
+    }
+
+    @Override
+    public void onAttachedToActivity(@NonNull ActivityPluginBinding binding) {
+        activityBinding = binding;
+        executorService = Executors.newFixedThreadPool(1);
+        setup(
+                pluginBinding.getBinaryMessenger(),
+                (Application) pluginBinding.getApplicationContext(),
+                activityBinding.getActivity(),
+                null,
+                activityBinding);
+    }
+
+    @Override
+    public void onDetachedFromActivityForConfigChanges() {
+        onDetachedFromActivity();
+    }
+
+    @Override
+    public void onReattachedToActivityForConfigChanges(@NonNull ActivityPluginBinding binding) {
+        onAttachedToActivity(binding);
+    }
+
+    @Override
+    public void onDetachedFromActivity() {
+        detach();
+    }
+
+    private void setup(
+            final BinaryMessenger messenger,
+            final Application application,
+            final Activity activity,
+            final PluginRegistry.Registrar registrar,
+            final ActivityPluginBinding activityBinding) {
+        synchronized (initializationLock) {
+            Log.i(TAG, "setup");
+            this.activity = activity;
+            this.application = application;
+            this.context = application;
+            channel = new MethodChannel(messenger, NAMESPACE + "/methods");
+            channel.setMethodCallHandler(this);
+            stateChannel = new EventChannel(messenger, NAMESPACE + "/state");
+            stateChannel.setStreamHandler(stateStreamHandler);
+            readChannel = new EventChannel(messenger, NAMESPACE + "/read");
+            readChannel.setStreamHandler(readResultsHandler);
+            mBluetoothManager = (BluetoothManager) application.getSystemService(Context.BLUETOOTH_SERVICE);
+            mBluetoothAdapter = mBluetoothManager.getAdapter();
+            if (registrar != null) {
+                // V1 embedding setup for activity listeners.
+                registrar.addRequestPermissionsResultListener(this);
+            } else {
+                // V2 embedding setup for activity listeners.
+                activityBinding.addRequestPermissionsResultListener(this);
+            }
+
+//            handler = new Handler(Looper.getMainLooper());
+        }
+    }
+
+
+    private void detach() {
+        Log.i(TAG, "detach");
+        context = null;
+        activityBinding.removeRequestPermissionsResultListener(this);
+        activityBinding = null;
+        channel.setMethodCallHandler(null);
+        channel = null;
+        stateChannel.setStreamHandler(null);
+        stateChannel = null;
+        mBluetoothAdapter = null;
+        mBluetoothManager = null;
+        application = null;
+    }
+
+    // MethodChannel.Result wrapper that responds on the platform thread.
+    private static class MethodResultWrapper implements Result {
+        private Result methodResult;
+        private Handler handler;
+
+        MethodResultWrapper(Result result) {
+            methodResult = result;
+            handler = new Handler(Looper.getMainLooper());
+        }
+
+        @Override
+        public void success(final Object result) {
+            handler.post(new Runnable() {
+                @Override
+                public void run() {
+                    methodResult.success(result);
+                }
+            });
+        }
+
+        @Override
+        public void error(final String errorCode, final String errorMessage, final Object errorDetails) {
+            handler.post(new Runnable() {
+                @Override
+                public void run() {
+                    methodResult.error(errorCode, errorMessage, errorDetails);
+                }
+            });
+        }
+
+        @Override
+        public void notImplemented() {
+            handler.post(new Runnable() {
+                @Override
+                public void run() {
+                    methodResult.notImplemented();
+                }
+            });
+        }
+    }
+
+    @Override
+    public void onMethodCall(MethodCall call, Result rawResult) {
+        Result result = new MethodResultWrapper(rawResult);
+
+        if (mBluetoothAdapter == null && !"isAvailable".equals(call.method)) {
+            result.error("bluetooth_unavailable", "the device does not have bluetooth", null);
+            return;
+        }
+
+        final Map<String, Object> arguments = call.arguments();
+
+        switch (call.method) {
+
+            case "isAvailable":
+                result.success(mBluetoothAdapter != null);
+                break;
+
+            case "isOn":
+                try {
+                    assert mBluetoothAdapter != null;
+                    result.success(mBluetoothAdapter.isEnabled());
+                } catch (Exception ex) {
+                    result.error("Error", ex.getMessage(), exceptionToString(ex));
+                }
+                break;
+
+            case "isConnected":
+                result.success(THREAD != null);
+                break;
+
+            case "getLastDevice":
+                result.success(lastDevice);
+                break;
+
+            case "openSettings":
+                ContextCompat.startActivity(context, new Intent(android.provider.Settings.ACTION_BLUETOOTH_SETTINGS),
+                        null);
+                result.success(true);
+                break;
+
+            case "getBondedDevices":
+                try {
+
+                    if (ContextCompat.checkSelfPermission(activity,
+                            Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
+
+                        ActivityCompat.requestPermissions(activity,
+                                new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, REQUEST_COARSE_LOCATION_PERMISSIONS);
+
+                        pendingResult = result;
+                        break;
+                    }
+
+                    getBondedDevices(result);
+
+                } catch (Exception ex) {
+                    result.error("Error", ex.getMessage(), exceptionToString(ex));
+                }
+
+                break;
+
+            case "connect":
+                if (arguments.containsKey("address")) {
+                    String address = (String) arguments.get("address");
+                    String name = (String) arguments.get("name");
+                    Log.d(TAG, "连接蓝牙名字：" + name);
+                    lastDevice = name;
+                    connect(result, address, name);
+                } else {
+                    result.error("invalid_argument", "argument 'address' not found", null);
+                }
+                break;
+
+            case "disconnect":
+                disconnect(result);
+                break;
+            case "writeBytes":
+                if (arguments.containsKey("message")) {
+                    byte[] message = (byte[]) arguments.get("message");
+                    writeBytes(result, message);
+                } else {
+                    result.error("invalid_argument", "argument 'message' not found", null);
+                }
+                break;
+            case "printTSCImage":
+                if (arguments.containsKey("config") && arguments.containsKey("data")) {
+                    final Map<String, Object> config = (Map<String, Object>) arguments.get("config");
+                    final List<Map<String, Object>> list = (List<Map<String, Object>>) arguments.get("data");
+                    printTSCImage(result, config, list);
+                }
+                break;
+            case "printNewLine":
+                printNewLine(result);
+                break;
+
+            case "paperCut":
+                paperCut(result);
+                break;
+
+            case "printImage":
+                if (arguments.containsKey("pathImage")) {
+                    String pathImage = (String) arguments.get("pathImage");
+                    printImage(result, pathImage);
+                } else {
+                    result.error("invalid_argument", "argument 'pathImage' not found", null);
+                }
+                break;
+
+            case "printImageBytes":
+                if (arguments.containsKey("bytes")) {
+                    byte[] bytes = (byte[]) arguments.get("bytes");
+                    printImageBytes(result, bytes);
+                } else {
+                    result.error("invalid_argument", "argument 'bytes' not found", null);
+                }
+                break;
+
+            case "printQRcode":
+                if (arguments.containsKey("textToQR")) {
+                    String textToQR = (String) arguments.get("textToQR");
+                    int width = (int) arguments.get("width");
+                    int height = (int) arguments.get("height");
+                    int align = (int) arguments.get("align");
+                    int light = (int) arguments.get("light");
+                    int weight = (int) arguments.get("weight");
+                    if (light == 0 && weight == 0) {
+                        printQRcode(result, textToQR, width, height, align);
+                    } else {
+                        printQRcode(result, textToQR, width, height, light, weight);
+                    }
+                } else {
+                    result.error("invalid_argument", "argument 'textToQR' not found", null);
+                }
+                break;
+            case "printBarCode":
+                if (arguments.containsKey("textToBar")) {
+                    String textToQR = (String) arguments.get("textToBar");
+                    int width = (int) arguments.get("width");
+                    int height = (int) arguments.get("height");
+                    int align = (int) arguments.get("align");
+                    int light = (int) arguments.get("light");
+                    int weight = (int) arguments.get("weight");
+                    if (light == 0 && weight == 0) {
+                        printBarCode(result, textToQR, width, height, align);
+                    } else {
+                        printBarCode(result, textToQR, width, height, light, weight);
+                    }
+                } else {
+                    result.error("invalid_argument", "argument 'textToQR' not found", null);
+                }
+                break;
+            case "printLeftRight":
+                if (arguments.containsKey("string1")) {
+                    String string1 = (String) arguments.get("string1");
+                    String string2 = (String) arguments.get("string2");
+                    int size = (int) arguments.get("size");
+                    String charset = (String) arguments.get("charset");
+                    String format = (String) arguments.get("format");
+                    printLeftRight(result, string1, string2, size, charset, format);
+                } else {
+                    result.error("invalid_argument", "argument 'message' not found", null);
+                }
+                break;
+            case "print3Column":
+                if (arguments.containsKey("string1")) {
+                    String string1 = (String) arguments.get("string1");
+                    String string2 = (String) arguments.get("string2");
+                    String string3 = (String) arguments.get("string3");
+                    int size = (int) arguments.get("size");
+                    String charset = (String) arguments.get("charset");
+                    String format = (String) arguments.get("format");
+                    print3Column(result, string1, string2, string3, size, charset, format);
+                } else {
+                    result.error("invalid_argument", "argument 'message' not found", null);
+                }
+                break;
+            case "print4Column":
+                if (arguments.containsKey("string1")) {
+                    String string1 = (String) arguments.get("string1");
+                    String string2 = (String) arguments.get("string2");
+                    String string3 = (String) arguments.get("string3");
+                    String string4 = (String) arguments.get("string4");
+                    int size = (int) arguments.get("size");
+                    String charset = (String) arguments.get("charset");
+                    String format = (String) arguments.get("format");
+                    print4Column(result, string1, string2, string3, string4, size, charset, format);
+                } else {
+                    result.error("invalid_argument", "argument 'message' not found", null);
+                }
+                break;
+            case "initPrinter":
+                initPrinter(result);
+                break;
+            case "printMarginLeft":
+                if (arguments.containsKey("left")) {
+                    int left = (int) arguments.get("left");
+                    printMarginLeft(result, left);
+                } else {
+                    result.error("invalid_argument", "argument 'message' not found", null);
+                }
+
+                break;
+            case "getQRcode":
+                if (arguments.containsKey("textToQR")) {
+                    String textToQR = (String) arguments.get("textToQR");
+                    int width = (int) arguments.get("width");
+                    int height = (int) arguments.get("height");
+                    int align = (int) arguments.get("align");
+                    int light = (int) arguments.get("light");
+                    int weight = (int) arguments.get("weight");
+                    try {
+                        getQRcode(result, textToQR, width, height, align);
+                    } catch (Exception ex) {
+                        result.error("Error", ex.getMessage(), exceptionToString(ex));
+                    }
+                }
+                break;
+            case "getBarCode":
+                if (arguments.containsKey("textToBar")) {
+                    String textToBar = (String) arguments.get("textToBar");
+                    int width = (int) arguments.get("width");
+                    int height = (int) arguments.get("height");
+                    int align = (int) arguments.get("align");
+                    int light = (int) arguments.get("light");
+                    int weight = (int) arguments.get("weight");
+                    try {
+                        getBarCode(result, textToBar, width, height, align);
+                    } catch (Exception ex) {
+                        result.error("Error", ex.getMessage(), exceptionToString(ex));
+                    }
+                }
+                break;
+            case "write":
+                if (arguments.containsKey("message")) {
+                    String message = (String) arguments.get("message");
+                    write(result, message);
+                } else {
+                    result.error("invalid_argument", "argument 'message' not found", null);
+                }
+                break;
+
+
+            case "printText":
+                if (arguments.containsKey("message")) {
+                    String message = (String) arguments.get("message");
+                    int size = (int) arguments.get("size");
+                    int align = (int) arguments.get("align");
+                    boolean bold = (boolean) arguments.get("bold");
+                    String charset = (String) arguments.get("charset");
+                    String format = (String) arguments.get("format");
+                    int light = (int) arguments.get("light");
+                    int weight = (int) arguments.get("weight");
+                    if (light == 0 && weight == 0) {
+                        printText(result, message, size, bold, align, charset, format);
+                    } else {
+                        printText(result, message, size, bold, light, weight, charset, format);
+                    }
+
+                } else {
+                    result.error("invalid_argument", "argument 'message' not found", null);
+                }
+                break;
+            default:
+                result.notImplemented();
+                break;
+
+        }
+    }
+
+    /**
+     * @param requestCode  requestCode
+     * @param permissions  permissions
+     * @param grantResults grantResults
+     * @return boolean
+     */
+    @Override
+    public boolean onRequestPermissionsResult(int requestCode, String[] permissions,
+                                              int[] grantResults) {
+
+        if (requestCode == REQUEST_COARSE_LOCATION_PERMISSIONS) {
+            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+                getBondedDevices(pendingResult);
+            } else {
+                pendingResult.error("no_permissions", "this plugin requires location permissions for scanning", null);
+                pendingResult = null;
+            }
+            return true;
+        }
+        return false;
+    }
+
+    private void initPrinter(Result result) {
+        if (THREAD == null) {
+            result.error("write_error", "not connected", null);
+            return;
+        }
+
+        try {
+            THREAD.write(PrinterCommands.initPrinter());
+            result.success(true);
+        } catch (Exception ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("write_error", ex.getMessage(), exceptionToString(ex));
+        }
+    }
+
+    private void printMarginLeft(Result result, int left) {
+        if (THREAD == null) {
+            result.error("write_error", "not connected", null);
+            return;
+        }
+
+        try {
+            THREAD.write(PrinterCommands.printMarginLeft(left));
+            result.success(true);
+        } catch (Exception ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("write_error", ex.getMessage(), exceptionToString(ex));
+        }
+    }
+
+    /**
+     * @param result result
+     */
+    private void getBondedDevices(Result result) {
+
+        List<Map<String, Object>> list = new ArrayList<>();
+
+        for (BluetoothDevice device : mBluetoothAdapter.getBondedDevices()) {
+            Map<String, Object> ret = new HashMap<>();
+            ret.put("address", device.getAddress());
+            ret.put("name", device.getName());
+            ret.put("type", device.getType());
+            int majorDevice = device.getBluetoothClass().getMajorDeviceClass();
+            if (majorDevice == 1536) {
+                list.add(ret);
+            }
+        }
+
+        result.success(list);
+    }
+
+    private String exceptionToString(Exception ex) {
+        StringWriter sw = new StringWriter();
+        PrintWriter pw = new PrintWriter(sw);
+        ex.printStackTrace(pw);
+        return sw.toString();
+    }
+
+    private void connect(Result result, String address, String name) {
+
+        if (THREAD != null) {
+            THREAD.cancel();
+            THREAD = null;
+            lastDevice = "";
+            result.error("connect_error", "already connected", null);
+            statusSink.success(0);
+            return;
+        }
+
+        executorService.submit(() -> {
+
+            try {
+                BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
+                boolean b = device.fetchUuidsWithSdp();
+                LogUtils.i("进来了，device连接方法++++++");
+                if (device == null) {
+                    if(THREAD != null)
+                    THREAD.cancel();
+                    THREAD = null;
+                    lastDevice = "";
+                    result.error("connect_error", "device not found", null);
+//                    sendStatus(3);
+                    return;
+                }
+
+                BluetoothSocket socket = device.createRfcommSocketToServiceRecord(MY_UUID);
+
+                if (socket == null) {
+//                    sendStatus(3);
+                    if(THREAD != null)
+                    THREAD.cancel();
+                    THREAD = null;
+                    lastDevice = "";
+                    result.error("connect_error", "socket connection not established", null);
+                    return;
+                }
+
+                // Cancel bt discovery, even though we didn't start it
+                mBluetoothAdapter.cancelDiscovery();
+
+                try {
+                    LogUtils.i("进来了，连接方法++++++");
+                    socket.connect();
+                    THREAD = new ConnectedThread(socket);
+                    THREAD.start();
+                    lastDevice = name;
+                    result.success(true);
+                } catch (IOException ex) {
+                    Log.e(TAG, ex.getMessage(), ex);
+                    if(THREAD != null)
+                    THREAD.cancel();
+                    THREAD = null;
+                    lastDevice = "";
+                    LogUtils.i("异常了，连接方法++++++");
+//                    sendStatus(3);
+                    result.error("connect_error", ex.getMessage(), exceptionToString(ex));
+                }
+            } catch (Exception ex) {
+                Log.e(TAG, ex.getMessage(), ex);
+                if(THREAD != null)
+                THREAD.cancel();
+                THREAD = null;
+                lastDevice = "";
+                LogUtils.i("异常了，连接方法++++++");
+//                sendStatus(3);
+                result.error("connect_error", ex.getMessage(), exceptionToString(ex));
+            }
+
+
+        });
+
+
+    }
+
+    /**
+     * @param result result
+     */
+    private void disconnect(Result result) {
+
+        if (THREAD == null) {
+            result.error("disconnection_error", "not connected", null);
+            return;
+        }
+        executorService.submit(() -> {
+            try {
+                if(THREAD != null)
+                THREAD.cancel();
+                THREAD = null;
+                lastDevice = "";
+                result.success(true);
+            } catch (Exception ex) {
+                Log.e(TAG, ex.getMessage(), ex);
+                result.error("disconnection_error", ex.getMessage(), exceptionToString(ex));
+            }
+        });
+    }
+
+//    private void sendStatus(int event) {
+//        handler.post(() -> statusSink.success(event));
+//    }
+
+    /**
+     * @param result  result
+     * @param message message
+     */
+    private void write(Result result, String message) {
+        if (THREAD == null) {
+            result.error("write_error", "not connected", null);
+            return;
+        }
+
+        try {
+            THREAD.write(message.getBytes());
+            result.success(true);
+        } catch (Exception ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("write_error", ex.getMessage(), exceptionToString(ex));
+        }
+    }
+
+    private void writeBytes(Result result, byte[] message) {
+        if (THREAD == null) {
+            result.error("write_error", "not connected", null);
+            return;
+        }
+
+        try {
+            result.success(true);
+            THREAD.write(message);
+        } catch (Exception ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("write_error", ex.getMessage(), exceptionToString(ex));
+        }
+    }
+
+    private void printText(Result result, String message, int size, boolean bold,
+                           int align, String charset, String format) {
+        // Print config "mode"
+        byte[] cc = new byte[]{0x1B, 0x21, 0x03}; // 0- normal size text
+        // byte[] cc1 = new byte[]{0x1B,0x21,0x00}; // 0- normal size text
+        byte[] bb = new byte[]{0x1B, 0x21, 0x08}; // 1- only bold text
+        byte[] bb2 = new byte[]{0x1B, 0x21, 0x20}; // 2- bold with medium text
+        byte[] bb3 = new byte[]{0x1B, 0x21, 0x10}; // 3- bold with large text
+        byte[] bb4 = new byte[]{0x1B, 0x21, 0x30}; // 4- strong text
+        if (THREAD == null) {
+            result.error("write_error", "not connected", null);
+            return;
+        }
+
+        try {
+            switch (size) {
+                case 0:
+                    THREAD.write(cc);
+                    break;
+                case 1:
+                    THREAD.write(bb);
+                    break;
+                case 2:
+                    THREAD.write(bb2);
+                    break;
+                case 3:
+                    THREAD.write(bb3);
+                    break;
+                case 4:
+                    THREAD.write(bb4);
+                    break;
+            }
+
+            switch (align) {
+                case 0:
+                    // left align
+                    THREAD.write(PrinterCommands.ESC_ALIGN_LEFT);
+                    break;
+                case 1:
+                    // center align
+                    THREAD.write(PrinterCommands.ESC_ALIGN_CENTER);
+                    break;
+                case 2:
+                    // right align
+                    THREAD.write(PrinterCommands.ESC_ALIGN_RIGHT);
+                    break;
+            }
+            if (format != null) {
+                message = String.format(format, message);
+            }
+            if (charset != null) {
+                THREAD.write(message.getBytes(charset));
+            } else {
+                THREAD.write(message.getBytes());
+            }
+            THREAD.write(PrinterCommands.FEED_LINE);
+            result.success(true);
+        } catch (Exception ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("write_error", ex.getMessage(), exceptionToString(ex));
+        }
+    }
+
+    private void printText(Result result, String message, int size, boolean bold, int light,
+                           int weight, String charset, String format) {
+        if (THREAD == null) {
+            result.error("write_error", "not connected", null);
+            return;
+        }
+
+        try {
+            THREAD.write(PrinterCommands.fontSizeSetBig(size));
+            THREAD.write(PrinterCommands.bold(bold));
+            THREAD.write(PrinterCommands.printLocation(light, weight));
+            if (format != null) {
+                message = String.format(format, message);
+            }
+            if (charset != null) {
+                THREAD.write(message.getBytes(charset));
+            } else {
+                THREAD.write(message.getBytes());
+            }
+            THREAD.write(PrinterCommands.FEED_LINE);
+            result.success(true);
+        } catch (
+                Exception ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("write_error", ex.getMessage(), exceptionToString(ex));
+        }
+    }
+
+    private void printLeftRight(Result result, String msg1, String msg2, int size, String
+            charset, String format) {
+        byte[] cc = new byte[]{0x1B, 0x21, 0x03}; // 0- normal size text
+        // byte[] cc1 = new byte[]{0x1B,0x21,0x00}; // 0- normal size text
+        byte[] bb = new byte[]{0x1B, 0x21, 0x08}; // 1- only bold text
+        byte[] bb2 = new byte[]{0x1B, 0x21, 0x20}; // 2- bold with medium text
+        byte[] bb3 = new byte[]{0x1B, 0x21, 0x10}; // 3- bold with large text
+        byte[] bb4 = new byte[]{0x1B, 0x21, 0x30}; // 4- strong text
+        if (THREAD == null) {
+            result.error("write_error", "not connected", null);
+            return;
+        }
+        try {
+            switch (size) {
+                case 0:
+                    THREAD.write(cc);
+                    break;
+                case 1:
+                    THREAD.write(bb);
+                    break;
+                case 2:
+                    THREAD.write(bb2);
+                    break;
+                case 3:
+                    THREAD.write(bb3);
+                    break;
+                case 4:
+                    THREAD.write(bb4);
+                    break;
+            }
+            THREAD.write(PrinterCommands.ESC_ALIGN_CENTER);
+            String line = String.format("%-15s %15s %n", msg1, msg2);
+            if (format != null) {
+                line = String.format(format, msg1, msg2);
+            }
+            if (charset != null) {
+                THREAD.write(line.getBytes(charset));
+            } else {
+                THREAD.write(line.getBytes());
+            }
+            result.success(true);
+        } catch (Exception ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("write_error", ex.getMessage(), exceptionToString(ex));
+        }
+
+    }
+
+    private void print3Column(Result result, String msg1, String msg2, String msg3,
+                              int size, String charset, String format) {
+        byte[] cc = new byte[]{0x1B, 0x21, 0x03}; // 0- normal size text
+        // byte[] cc1 = new byte[]{0x1B,0x21,0x00}; // 0- normal size text
+        byte[] bb = new byte[]{0x1B, 0x21, 0x08}; // 1- only bold text
+        byte[] bb2 = new byte[]{0x1B, 0x21, 0x20}; // 2- bold with medium text
+        byte[] bb3 = new byte[]{0x1B, 0x21, 0x10}; // 3- bold with large text
+        byte[] bb4 = new byte[]{0x1B, 0x21, 0x30}; // 4- strong text
+        if (THREAD == null) {
+            result.error("write_error", "not connected", null);
+            return;
+        }
+        try {
+            switch (size) {
+                case 0:
+                    THREAD.write(cc);
+                    break;
+                case 1:
+                    THREAD.write(bb);
+                    break;
+                case 2:
+                    THREAD.write(bb2);
+                    break;
+                case 3:
+                    THREAD.write(bb3);
+                    break;
+                case 4:
+                    THREAD.write(bb4);
+                    break;
+            }
+            THREAD.write(PrinterCommands.ESC_ALIGN_CENTER);
+            String line = String.format("%-10s %10s %10s %n", msg1, msg2, msg3);
+            if (format != null) {
+                line = String.format(format, msg1, msg2, msg3);
+            }
+            if (charset != null) {
+                THREAD.write(line.getBytes(charset));
+            } else {
+                THREAD.write(line.getBytes());
+            }
+            result.success(true);
+        } catch (Exception ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("write_error", ex.getMessage(), exceptionToString(ex));
+        }
+
+    }
+
+    private void print4Column(Result result, String msg1, String msg2, String msg3, String msg4,
+                              int size, String charset, String format) {
+        byte[] cc = new byte[]{0x1B, 0x21, 0x03}; // 0- normal size text
+        // byte[] cc1 = new byte[]{0x1B,0x21,0x00}; // 0- normal size text
+        byte[] bb = new byte[]{0x1B, 0x21, 0x08}; // 1- only bold text
+        byte[] bb2 = new byte[]{0x1B, 0x21, 0x20}; // 2- bold with medium text
+        byte[] bb3 = new byte[]{0x1B, 0x21, 0x10}; // 3- bold with large text
+        byte[] bb4 = new byte[]{0x1B, 0x21, 0x30}; // 4- strong text
+        if (THREAD == null) {
+            result.error("write_error", "not connected", null);
+            return;
+        }
+        try {
+            switch (size) {
+                case 0:
+                    THREAD.write(cc);
+                    break;
+                case 1:
+                    THREAD.write(bb);
+                    break;
+                case 2:
+                    THREAD.write(bb2);
+                    break;
+                case 3:
+                    THREAD.write(bb3);
+                    break;
+                case 4:
+                    THREAD.write(bb4);
+                    break;
+            }
+            THREAD.write(PrinterCommands.ESC_ALIGN_CENTER);
+            String line = String.format("%-8s %7s %7s %7s %n", msg1, msg2, msg3, msg4);
+            if (format != null) {
+                line = String.format(format, msg1, msg2, msg3, msg4);
+            }
+            if (charset != null) {
+                THREAD.write(line.getBytes(charset));
+            } else {
+                THREAD.write(line.getBytes());
+            }
+            result.success(true);
+        } catch (Exception ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("write_error", ex.getMessage(), exceptionToString(ex));
+        }
+
+    }
+
+    private void printNewLine(Result result) {
+        if (THREAD == null) {
+            result.error("write_error", "not connected", null);
+            return;
+        }
+        try {
+            THREAD.write(PrinterCommands.FEED_LINE);
+            result.success(true);
+        } catch (Exception ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("write_error", ex.getMessage(), exceptionToString(ex));
+        }
+    }
+
+    private void paperCut(Result result) {
+        if (THREAD == null) {
+            result.error("write_error", "not connected", null);
+            return;
+        }
+        try {
+            THREAD.write(PrinterCommands.FEED_PAPER_AND_CUT);
+            result.success(true);
+        } catch (Exception ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("write_error", ex.getMessage(), exceptionToString(ex));
+        }
+    }
+
+    private void printImage(Result result, String pathImage) {
+        if (THREAD == null) {
+            result.error("write_error", "not connected", null);
+            return;
+        }
+        try {
+            Bitmap bmp = BitmapFactory.decodeFile(pathImage);
+            if (bmp != null) {
+                byte[] command = Utils.decodeBitmap(bmp);
+                THREAD.write(PrinterCommands.ESC_ALIGN_CENTER);
+                THREAD.write(command);
+            } else {
+                Log.e("Print Photo error", "the file isn't exists");
+            }
+            result.success(true);
+        } catch (Exception ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("write_error", ex.getMessage(), exceptionToString(ex));
+        }
+    }
+
+    private void printImageBytes(Result result, byte[] bytes) {
+        if (THREAD == null) {
+            result.error("write_error", "not connected", null);
+            return;
+        }
+        try {
+            Bitmap bmp = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
+            if (bmp != null) {
+                byte[] command = Utils.decodeBitmap(bmp);
+                THREAD.write(PrinterCommands.ESC_ALIGN_CENTER);
+                THREAD.write(command);
+            } else {
+                Log.e("Print Photo error", "the file isn't exists");
+            }
+            result.success(true);
+        } catch (Exception ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("write_error", ex.getMessage(), exceptionToString(ex));
+        }
+    }
+
+
+    private void getQRcode(Result result, String textToQR, int width, int height, int align) {
+        try {
+            byte[] positionBytes = new byte[3];
+            MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
+            switch (align) {
+                case 0:
+                    // left align
+                    positionBytes = PrinterCommands.ESC_ALIGN_LEFT;
+                    break;
+                case 1:
+                    // center align
+                    positionBytes = PrinterCommands.ESC_ALIGN_CENTER;
+                    break;
+                case 2:
+                    // right align
+                    positionBytes = PrinterCommands.ESC_ALIGN_RIGHT;
+                    break;
+            }
+
+            BitMatrix bitMatrix = multiFormatWriter.encode(textToQR, BarcodeFormat.QR_CODE, width, height);
+            BarcodeEncoder barcodeEncoder = new BarcodeEncoder();
+            Bitmap bmp = barcodeEncoder.createBitmap(bitMatrix);
+            byte[] bmpBytes = Utils.decodeBitmap(bmp);
+            byte[] bytes = Utils.byteMerger(positionBytes, bmpBytes);
+            result.success(bytes);
+        } catch (WriterException ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("getQRcode_error", ex.getMessage(), exceptionToString(ex));
+        }
+    }
+
+    private void printQRcode(Result result, String textToQR, int width, int height, int align) {
+        MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
+        if (THREAD == null) {
+            result.error("write_error", "not connected", null);
+            return;
+        }
+        try {
+            switch (align) {
+                case 0:
+                    // left align
+                    THREAD.write(PrinterCommands.ESC_ALIGN_LEFT);
+                    break;
+                case 1:
+                    // center align
+                    THREAD.write(PrinterCommands.ESC_ALIGN_CENTER);
+                    break;
+                case 2:
+                    // right align
+                    THREAD.write(PrinterCommands.ESC_ALIGN_RIGHT);
+                    break;
+            }
+            BitMatrix bitMatrix = multiFormatWriter.encode(textToQR, BarcodeFormat.QR_CODE, width, height);
+            BarcodeEncoder barcodeEncoder = new BarcodeEncoder();
+            Bitmap bmp = barcodeEncoder.createBitmap(bitMatrix);
+
+            if (bmp != null) {
+                byte[] command = Utils.decodeBitmap(bmp);
+                THREAD.write(command);
+            } else {
+                Log.e("Print Photo error", "the file isn't exists");
+            }
+            result.success(true);
+        } catch (Exception ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("write_error", ex.getMessage(), exceptionToString(ex));
+        }
+    }
+
+    private void printQRcode(Result result, String textToQR, int width, int height, int light,
+                             int weight) {
+        MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
+        if (THREAD == null) {
+            result.error("write_error", "not connected", null);
+            return;
+        }
+        try {
+            THREAD.write(PrinterCommands.printLocation(light, weight));
+            BitMatrix bitMatrix = multiFormatWriter.encode(textToQR, BarcodeFormat.QR_CODE, width, height);
+            BarcodeEncoder barcodeEncoder = new BarcodeEncoder();
+            Bitmap bmp = barcodeEncoder.createBitmap(bitMatrix);
+
+            if (bmp != null) {
+                byte[] command = Utils.decodeBitmap(bmp);
+                THREAD.write(command);
+            } else {
+                Log.e("Print Photo error", "the file isn't exists");
+            }
+            result.success(true);
+        } catch (Exception ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("write_error", ex.getMessage(), exceptionToString(ex));
+        }
+    }
+
+    private void getBarCode(Result result, String textToBar, int width, int height, int align) {
+        byte[] positionBytes = new byte[3];
+        switch (align) {
+            case 0:
+                // left align
+                positionBytes = PrinterCommands.ESC_ALIGN_LEFT;
+                break;
+            case 1:
+                // center align
+                positionBytes = PrinterCommands.ESC_ALIGN_CENTER;
+                break;
+            case 2:
+                // right align
+                positionBytes = PrinterCommands.ESC_ALIGN_RIGHT;
+                break;
+        }
+        Bitmap bmp = QRCodeEncoder.syncEncodeBarcode(textToBar, width, height, 0);
+        byte[] bmpBytes = Utils.decodeBitmap(bmp);
+        byte[] bytes = Utils.byteMerger(positionBytes, bmpBytes);
+        result.success(bytes);
+    }
+
+
+    /**
+     * 标签打印对象转换
+     */
+    public void printTSCImage(Result result, Map<String, Object> config, List<Map<String, Object>> list) {
+        LabelCommand tsc = new LabelCommand();
+
+        int width = (int) (config.get("width") == null ? 60 : config.get("width")); // 单位：mm
+        int height = (int) (config.get("height") == null ? 75 : config.get("height")); // 单位：mm
+        int gap = (int) (config.get("gap") == null ? 0 : config.get("gap")); // 单位：mm
+        Log.d(TAG, "mapToLabel: width = " + width + ", height = " + height + ", gap = " + gap);
+        // 设置标签尺寸宽高，按照实际尺寸设置 单位mm
+        tsc.addSize(width, height);
+        // 设置标签间隙，按照实际尺寸设置，如果为无间隙纸则设置为0 单位mm
+        tsc.addGap(gap);
+//        // 设置打印方向
+//        tsc.addDirection(LabelCommand.DIRECTION.FORWARD, LabelCommand.MIRROR.NORMAL);
+//        // 开启带Response的打印，用于连续打印
+//        tsc.addQueryPrinterStatus(LabelCommand.RESPONSE_MODE.ON);
+//        // 设置原点坐标
+//        tsc.addReference(0, 0);
+//        //设置浓度
+//        tsc.addDensity(LabelCommand.DENSITY.DNESITY4);
+//        // 撕纸模式开启
+//        tsc.addTear(EscCommand.ENABLE.ON);
+        // 清除打印缓冲区
+        tsc.addCls();
+
+        // {type:'text|barcode|qrcode|image', content:'', x:0,y:0}
+        for (Map<String, Object> m : list) {
+            Log.d(TAG, "printTSCImage: "+m);
+            String type = (String) m.get("type");
+            String content = (String) m.get("content");
+            int x = (int) (m.get("x") == null ? 0 : m.get("x")); //dpi: 1mm约为8个点
+            int y = (int) (m.get("y") == null ? 0 : m.get("y"));
+            int contentWidth = (int) (m.get("width") == null ? 300 : m.get("width"));
+
+            if ("text".equals(type)) {
+                // 绘制简体中文
+                tsc.addText(x, y, LabelCommand.FONTTYPE.SIMPLIFIED_CHINESE, LabelCommand.ROTATION.ROTATION_0, LabelCommand.FONTMUL.MUL_1, LabelCommand.FONTMUL.MUL_1, content);
+                //打印繁体
+                //tsc.addUnicodeText(10,32, LabelCommand.FONTTYPE.TRADITIONAL_CHINESE, LabelCommand.ROTATION.ROTATION_0, LabelCommand.FONTMUL.MUL_1, LabelCommand.FONTMUL.MUL_1,"BIG5碼繁體中文字元","BIG5");
+                //打印韩文
+                //tsc.addUnicodeText(10,60, LabelCommand.FONTTYPE.KOREAN, LabelCommand.ROTATION.ROTATION_0, LabelCommand.FONTMUL.MUL_1, LabelCommand.FONTMUL.MUL_1,"Korean 지아보 하성","EUC_KR");
+            } else if ("barcode".equals(type)) {
+                tsc.add1DBarcode(x, y, LabelCommand.BARCODETYPE.CODE128, 100, LabelCommand.READABEL.EANBEL, LabelCommand.ROTATION.ROTATION_0, content);
+            } else if ("qrcode".equals(type)) {
+                tsc.addQRCode(x, y, LabelCommand.EEC.LEVEL_L, 5, LabelCommand.ROTATION.ROTATION_0, content);
+            } else if ("image".equals(type)) {
+                byte[] bytes = Base64.decode(content, Base64.DEFAULT);
+                Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
+                tsc.addBitmap(x, y, LabelCommand.BITMAP_MODE.OVERWRITE, contentWidth, bitmap);
+            }
+        }
+
+        // 打印标签
+        tsc.addPrint(1, 1);
+        // 打印标签后 蜂鸣器响
+        tsc.addSound(2, 100);
+        //开启钱箱
+//        tsc.addCashdrwer(LabelCommand.FOOT.F5, 255, 255);
+        // 发送数据
+        Byte[] objects = tsc.getCommand().toArray(new Byte[0]);
+        writeBytes(result, toPrimitives(objects));
+    }
+
+    byte[] toPrimitives(Byte[] oBytes) {
+        byte[] bytes = new byte[oBytes.length];
+        for (int i = 0; i < oBytes.length; i++) {
+            bytes[i] = oBytes[i];
+        }
+        return bytes;
+    }
+
+
+    private void printBarCode(Result result, String textToBar, int width, int height, int align) {
+        if (THREAD == null) {
+            result.error("write_error", "not connected", null);
+            return;
+        }
+        try {
+            switch (align) {
+                case 0:
+                    // left align
+                    THREAD.write(PrinterCommands.ESC_ALIGN_LEFT);
+                    break;
+                case 1:
+                    // center align
+                    THREAD.write(PrinterCommands.ESC_ALIGN_CENTER);
+                    break;
+                case 2:
+                    // right align
+                    THREAD.write(PrinterCommands.ESC_ALIGN_RIGHT);
+                    break;
+            }
+            Bitmap bmp = QRCodeEncoder.syncEncodeBarcode(textToBar, width, height, 0);
+            if (bmp != null) {
+                THREAD.write(Utils.parseBmpToByte(bmp));
+            } else {
+                Log.e("Print Photo error", "the file isn't exists");
+            }
+            result.success(true);
+        } catch (Exception ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("write_error", ex.getMessage(), exceptionToString(ex));
+        }
+    }
+
+    private void printBarCode(Result result, String textToBar, int width, int height, int light,
+                              int weight) {
+        if (THREAD == null) {
+            result.error("write_error", "not connected", null);
+            return;
+        }
+        try {
+            THREAD.write(PrinterCommands.printLocation(light, weight));
+            Bitmap bmp = QRCodeEncoder.syncEncodeBarcode(textToBar, width, height, 0);
+            if (bmp != null) {
+                THREAD.write(Utils.parseBmpToByte(bmp));
+            } else {
+                Log.e("Print Photo error", "the file isn't exists");
+            }
+            result.success(true);
+        } catch (Exception ex) {
+            Log.e(TAG, ex.getMessage(), ex);
+            result.error("write_error", ex.getMessage(), exceptionToString(ex));
+        }
+    }
+
+    private class ConnectedThread extends Thread {
+        private final BluetoothSocket mmSocket;
+        private final InputStream inputStream;
+        private final OutputStream outputStream;
+
+        ConnectedThread(BluetoothSocket socket) {
+            mmSocket = socket;
+            InputStream tmpIn = null;
+            OutputStream tmpOut = null;
+
+            try {
+                tmpIn = socket.getInputStream();
+                tmpOut = socket.getOutputStream();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+            inputStream = tmpIn;
+            outputStream = tmpOut;
+        }
+
+        public void run() {
+            byte[] buffer = new byte[1024];
+            int bytes;
+            while (true) {
+                try {
+                    bytes = inputStream.read(buffer);
+                    readSink.success(new String(buffer, 0, bytes));
+                } catch (NullPointerException e) {
+                    break;
+                } catch (IOException e) {
+                    break;
+                }
+            }
+        }
+
+        public void write(byte[] bytes) {
+            try {
+                outputStream.write(bytes);
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+
+        public void cancel() {
+            try {
+                outputStream.flush();
+                outputStream.close();
+
+                inputStream.close();
+
+                mmSocket.close();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    private final StreamHandler stateStreamHandler = new StreamHandler() {
+
+        private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
+            @Override
+            public void onReceive(Context context, Intent intent) {
+                final String action = intent.getAction();
+
+                Log.d(TAG, "蓝牙广播：" + action);
+
+                if (BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)) {
+                    THREAD = null;
+                    statusSink.success(intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, -1));
+                } else if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(action)) {
+                    statusSink.success(1);
+                } else if (BluetoothDevice.ACTION_ACL_DISCONNECTED.equals(action)) {
+                    THREAD = null;
+                    statusSink.success(0);
+                }
+            }
+        };
+
+        @Override
+        public void onListen(Object o, EventSink eventSink) {
+            statusSink = eventSink;
+            Log.d(TAG, "注册蓝牙广播：");
+            context.registerReceiver(mReceiver, new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED));
+
+            context.registerReceiver(mReceiver, new IntentFilter(BluetoothDevice.ACTION_ACL_CONNECTED));
+
+            context.registerReceiver(mReceiver, new IntentFilter(BluetoothDevice.ACTION_ACL_DISCONNECTED));
+        }
+
+        @Override
+        public void onCancel(Object o) {
+            statusSink = null;
+            Log.d(TAG, "取消注册蓝牙广播：");
+            context.unregisterReceiver(mReceiver);
+        }
+    };
+
+    private final StreamHandler readResultsHandler = new StreamHandler() {
+        @Override
+        public void onListen(Object o, EventSink eventSink) {
+            Log.d(TAG, "回调蓝牙广播：");
+            readSink = eventSink;
+        }
+
+        @Override
+        public void onCancel(Object o) {
+            readSink = null;
+        }
+    };
+}
\ No newline at end of file

android/src/main/java/id/kakzaki/blue_thermal_printer/PrinterCommands.java

+package id.kakzaki.blue_thermal_printer;
+
+/**
+ * Created by https://goo.gl/UAfmBd on 2/6/2017.
+ */
+
+public class PrinterCommands {
+    public static final byte HT = 0x9;
+    public static final byte LF = 0x0A;
+    public static final byte CR = 0x0D;
+    public static final byte ESC = 0x1B;
+    public static final byte DLE = 0x10;
+    public static final byte GS = 0x1D;
+    public static final byte FS = 0x1C;
+    public static final byte STX = 0x02;
+    public static final byte US = 0x1F;
+    public static final byte CAN = 0x18;
+    public static final byte CLR = 0x0C;
+    public static final byte EOT = 0x04;
+
+    public static final byte[] INIT = {27, 64};
+    public static byte[] FEED_LINE = {10};
+
+    public static byte[] SELECT_FONT_A = {20, 33, 0};
+
+    public static byte[] SET_BAR_CODE_HEIGHT = {29, 104, 100};
+    public static byte[] PRINT_BAR_CODE_1 = {29, 107, 2};
+    public static byte[] SEND_NULL_BYTE = {0x00};
+
+    public static byte[] SELECT_PRINT_SHEET = {0x1B, 0x63, 0x30, 0x02};
+    public static byte[] FEED_PAPER_AND_CUT = {0x1D, 0x56, 66, 0x00};
+
+    public static byte[] SELECT_CYRILLIC_CHARACTER_CODE_TABLE = {0x1B, 0x74, 0x11};
+
+    public static byte[] SELECT_BIT_IMAGE_MODE = {0x1B, 0x2A, 33, -128, 0};
+    public static byte[] SET_LINE_SPACING_24 = {0x1B, 0x33, 24};
+    public static byte[] SET_LINE_SPACING_30 = {0x1B, 0x33, 30};
+
+    public static byte[] TRANSMIT_DLE_PRINTER_STATUS = {0x10, 0x04, 0x01};
+    public static byte[] TRANSMIT_DLE_OFFLINE_PRINTER_STATUS = {0x10, 0x04, 0x02};
+    public static byte[] TRANSMIT_DLE_ERROR_STATUS = {0x10, 0x04, 0x03};
+    public static byte[] TRANSMIT_DLE_ROLL_PAPER_SENSOR_STATUS = {0x10, 0x04, 0x04};
+
+    public static final byte[] ESC_FONT_COLOR_DEFAULT = new byte[]{0x1B, 'r', 0x00};
+    public static final byte[] FS_FONT_ALIGN = new byte[]{0x1C, 0x21, 1, 0x1B,
+            0x21, 1};
+    public static final byte[] ESC_ALIGN_LEFT = new byte[]{0x1b, 'a', 0x00};
+    public static final byte[] ESC_ALIGN_RIGHT = new byte[]{0x1b, 'a', 0x02};
+    public static final byte[] ESC_ALIGN_CENTER = new byte[]{0x1b, 'a', 0x01};
+    public static final byte[] ESC_CANCEL_BOLD = new byte[]{0x1B, 0x45, 0};
+
+
+    /*********************************************/
+    public static final byte[] ESC_HORIZONTAL_CENTERS = new byte[]{0x1B, 0x44, 20, 28, 00};
+    public static final byte[] ESC_CANCLE_HORIZONTAL_CENTERS = new byte[]{0x1B, 0x44, 00};
+    /*********************************************/
+
+    public static final byte[] ESC_ENTER = new byte[]{0x1B, 0x4A, 0x40};
+    public static final byte[] PRINTE_TEST = new byte[]{0x1D, 0x28, 0x41};
+    public static final byte[] position = new byte[]{0x1B, 0x24, 20, 1};
+
+    public static final byte[] reset = new byte[]{0x1b, 0x40};
+    public static final byte[] print = new byte[]{0x0a};
+
+
+    public static byte[] initPrinter(){
+        byte[] result = new byte[2];
+        result[0] = ESC;
+        result[1] = 64;
+        return result;
+    }
+
+    /**
+     * 设置左边距
+     */
+    public static byte[] printMarginLeft(int left) {
+        byte[] result = new byte[4];
+        result[0] = 0x1D;
+        result[1] = 0x4C;
+        result[2] = (byte) left;
+        result[3] = 0;
+        return result;
+    }
+
+    /**
+     * 设置位置
+     */
+    public static byte[] printLocation(int light, int weight) {
+        byte[] result = new byte[4];
+        result[0] = 0x1D;
+        result[1] = 0x4C;
+        result[2] = (byte) light;
+        result[3] = (byte)weight;
+        return result;
+    }
+
+    /**
+     * 字体变大为标准的n倍
+     */
+    public static byte[] fontSizeSetBig(int num) {
+        byte realSize = 0;
+        switch (num) {
+            case 1:
+                realSize = 0;
+                break;
+            case 2:
+                realSize = 17;
+                break;
+            case 3:
+                realSize = 34;
+                break;
+            case 4:
+                realSize = 51;
+                break;
+            case 5:
+                realSize = 68;
+                break;
+            case 6:
+                realSize = 85;
+                break;
+            case 7:
+                realSize = 102;
+                break;
+            case 8:
+                realSize = 119;
+                break;
+        }
+        byte[] result = new byte[3];
+        result[0] = 29;
+        result[1] = 33;
+        result[2] = realSize;
+        return result;
+    }
+
+    /**
+     * 是否加粗
+     */
+    public static byte[] bold(boolean flag) {
+        byte[] result = new byte[3];
+        if(flag){
+            result[0] = ESC;
+            result[1] = 69;
+            result[2] = 0xF;
+        }else {
+            result[0] = ESC;
+            result[1] = 69;
+            result[2] = 0;
+        }
+        return result;
+    }
+}
\ No newline at end of file

android/src/main/java/id/kakzaki/blue_thermal_printer/Utils.java

+package id.kakzaki.blue_thermal_printer;
+
+import android.graphics.Bitmap;
+import android.util.Log;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Utils {
+    // UNICODE 0x23 = #
+    public static final byte[] UNICODE_TEXT = new byte[]{0x23, 0x23, 0x23,
+            0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23,
+            0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23,
+            0x23, 0x23, 0x23};
+
+    private static String hexStr = "0123456789ABCDEF";
+    private static String[] binaryArray = {"0000", "0001", "0010", "0011",
+            "0100", "0101", "0110", "0111", "1000", "1001", "1010", "1011",
+            "1100", "1101", "1110", "1111"};
+
+    public static byte[] decodeBitmap(Bitmap bmp) {
+        int bmpWidth = bmp.getWidth();
+        int bmpHeight = bmp.getHeight();
+
+        List<String> list = new ArrayList<String>(); //binaryString list
+        StringBuffer sb;
+
+
+        int bitLen = bmpWidth / 8;
+        int zeroCount = bmpWidth % 8;
+
+        String zeroStr = "";
+        if (zeroCount > 0) {
+            bitLen = bmpWidth / 8 + 1;
+            for (int i = 0; i < (8 - zeroCount); i++) {
+                zeroStr = zeroStr + "0";
+            }
+        }
+
+        for (int i = 0; i < bmpHeight; i++) {
+            sb = new StringBuffer();
+            for (int j = 0; j < bmpWidth; j++) {
+                int color = bmp.getPixel(j, i);
+
+                int r = (color >> 16) & 0xff;
+                int g = (color >> 8) & 0xff;
+                int b = color & 0xff;
+
+                // if color close to white，bit='0', else bit='1'
+                if (r > 160 && g > 160 && b > 160)
+                    sb.append("0");
+                else
+                    sb.append("1");
+            }
+            if (zeroCount > 0) {
+                sb.append(zeroStr);
+            }
+            list.add(sb.toString());
+        }
+
+        List<String> bmpHexList = binaryListToHexStringList(list);
+        String commandHexString = "1D763000";
+        String widthHexString = Integer
+                .toHexString(bmpWidth % 8 == 0 ? bmpWidth / 8
+                        : (bmpWidth / 8 + 1));
+        if (widthHexString.length() > 10) {
+            Log.e("decodeBitmap error", " width is too large");
+            return null;
+        } else if (widthHexString.length() == 1) {
+            widthHexString = "0" + widthHexString;
+        }
+        widthHexString = widthHexString + "00";
+
+        String heightHexString = Integer.toHexString(bmpHeight);
+        if (heightHexString.length() > 10) {
+            Log.e("decodeBitmap error", " height is too large");
+            return null;
+        } else if (heightHexString.length() == 1) {
+            heightHexString = "0" + heightHexString;
+        }
+        heightHexString = heightHexString + "00";
+
+        List<String> commandList = new ArrayList<String>();
+        commandList.add(commandHexString + widthHexString + heightHexString);
+        commandList.addAll(bmpHexList);
+
+        return hexList2Byte(commandList);
+    }
+
+    public static List<String> binaryListToHexStringList(List<String> list) {
+        List<String> hexList = new ArrayList<String>();
+        for (String binaryStr : list) {
+            StringBuffer sb = new StringBuffer();
+            for (int i = 0; i < binaryStr.length(); i += 8) {
+                String str = binaryStr.substring(i, i + 8);
+
+                String hexString = myBinaryStrToHexString(str);
+                sb.append(hexString);
+            }
+            hexList.add(sb.toString());
+        }
+        return hexList;
+
+    }
+
+    public static String myBinaryStrToHexString(String binaryStr) {
+        String hex = "";
+        String f4 = binaryStr.substring(0, 4);
+        String b4 = binaryStr.substring(4, 8);
+        for (int i = 0; i < binaryArray.length; i++) {
+            if (f4.equals(binaryArray[i]))
+                hex += hexStr.substring(i, i + 1);
+        }
+        for (int i = 0; i < binaryArray.length; i++) {
+            if (b4.equals(binaryArray[i]))
+                hex += hexStr.substring(i, i + 1);
+        }
+
+        return hex;
+    }
+
+    public static byte[] hexList2Byte(List<String> list) {
+        List<byte[]> commandList = new ArrayList<byte[]>();
+
+        for (String hexStr : list) {
+            commandList.add(hexStringToBytes(hexStr));
+        }
+        byte[] bytes = sysCopy(commandList);
+        return bytes;
+    }
+
+    public static byte[] hexStringToBytes(String hexString) {
+        if (hexString == null || hexString.equals("")) {
+            return null;
+        }
+        hexString = hexString.toUpperCase();
+        int length = hexString.length() / 2;
+        char[] hexChars = hexString.toCharArray();
+        byte[] d = new byte[length];
+        for (int i = 0; i < length; i++) {
+            int pos = i * 2;
+            d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
+        }
+        return d;
+    }
+
+    public static byte[] sysCopy(List<byte[]> srcArrays) {
+        int len = 0;
+        for (byte[] srcArray : srcArrays) {
+            len += srcArray.length;
+        }
+        byte[] destArray = new byte[len];
+        int destLen = 0;
+        for (byte[] srcArray : srcArrays) {
+            System.arraycopy(srcArray, 0, destArray, destLen, srcArray.length);
+            destLen += srcArray.length;
+        }
+        return destArray;
+    }
+
+    private static byte charToByte(char c) {
+        return (byte) "0123456789ABCDEF".indexOf(c);
+    }
+
+
+    /*
+     * 将数据 按照最大长度分段
+     *
+     * n 表示按照最大max_length 可以分隔成的段数
+     * m 表示余数
+     * */
+    public static List<byte[]> separatorBytes(byte[] bytes) {
+        List<byte[]> list = new ArrayList<>();
+        // 每次传输最大的字节数 超过600可能会导致打印不出来
+//        int maxLength = 146;
+//        if (Platform.isAndroid) {
+        int maxLength = 500;
+//        }
+        int length = bytes.length;
+
+        int n = length / maxLength;
+        int m = length % maxLength;
+        if (m > 0) {
+            n += 1;
+        }
+
+        for (int i = 0; i < n; i++) {
+            int start = i * maxLength;
+            int end = start + maxLength;
+            if (end > length) {
+                end = length;
+            }
+            byte[] temBytes = new byte[end - start];
+            System.arraycopy(bytes, start, temBytes, 0, temBytes.length);
+            list.add(temBytes);
+        }
+        return list;
+    }
+
+
+    /**
+     * @param bitmap
+     * @return 将图片转数组
+     */
+    public static byte[] parseBmpToByte(Bitmap bitmap) {
+        int scaleHeight = bitmap.getHeight();
+        //宽度要是8的倍数
+        int bitWidth = (bitmap.getWidth() + 7) / 8 * 8;
+        int width = bitmap.getWidth();
+        int data[] = new int[width * scaleHeight];
+        byte dataVec[] = new byte[bitWidth * scaleHeight / 8 + 8];
+        long start = System.currentTimeMillis();
+        dataVec[0] = 29;
+        dataVec[1] = 118;
+        dataVec[2] = 48;
+        dataVec[3] = 0;
+        dataVec[4] = (byte) (bitWidth / 8 % 256);
+        dataVec[5] = (byte) (bitWidth / 8 / 256);
+        dataVec[6] = (byte) (scaleHeight % 256);
+        dataVec[7] = (byte) (scaleHeight / 256);
+        int k = 8;
+        bitmap.getPixels(data, 0, width, 0, 0, width, scaleHeight);
+        for (int h = 0; h < scaleHeight; h++) {
+            for (int w = 0; w < bitWidth; w += 8) {
+                int value = 0;
+                for (int i = 0; i < 8; i++) {
+                    int index = h * width + w + i;
+                    if (w + i >= width) {
+                        // 超度图片的大小零填充
+                        value |= 0;
+                    } else {
+                        //这里就是高低在前低位在后
+                        value |= px2Byte(data[index]) << (7 - i);
+                    }
+                }
+                dataVec[k++] = (byte) value;
+            }
+        }
+        return dataVec;
+
+    }
+
+    public static byte px2Byte(int pixel) {
+
+        byte b;
+        int red = (pixel & 0x00ff0000) >> 16; // 取高两位
+        int green = (pixel & 0x0000ff00) >> 8; // 取中两位
+        int blue = pixel & 0x000000ff; // 取低两位
+        int gray = rgb2gray(red, green, blue);
+        if (gray < 127) {
+            b = 1;
+        } else {
+            b = 0;
+        }
+        return b;
+    }
+
+    public static int rgb2gray(int r, int g, int b) {
+        return (int) Math.round(0.299 * r + 0.587 * g + 0.114 * b);
+    }
+
+
+    //System.arraycopy()方法
+    public static byte[] byteMerger(byte[] bt1, byte[] bt2){
+        byte[] bt3 = new byte[bt1.length+bt2.length];
+        System.arraycopy(bt1, 0, bt3, 0, bt1.length);
+        System.arraycopy(bt2, 0, bt3, bt1.length, bt2.length);
+        return bt3;
+    }
+}

blue_thermal_printer.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module external.linked.project.id="blue_thermal_printer" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" type="JAVA_MODULE" version="4">
+  <component name="FacetManager">
+    <facet type="java-gradle" name="Java-Gradle">
+      <configuration>
+        <option name="BUILD_FOLDER_PATH" value="$MODULE_DIR$/build" />
+        <option name="BUILDABLE" value="false" />
+      </configuration>
+    </facet>
+  </component>
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_6" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/.dart_tool" />
+      <excludeFolder url="file://$MODULE_DIR$/.gradle" />
+      <excludeFolder url="file://$MODULE_DIR$/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/build" />
+      <excludeFolder url="file://$MODULE_DIR$/example/.dart_tool" />
+      <excludeFolder url="file://$MODULE_DIR$/example/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/example/build" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/blue_thermal_printer/.dart_tool" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/blue_thermal_printer/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/blue_thermal_printer/build" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/blue_thermal_printer/example/.dart_tool" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/blue_thermal_printer/example/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/blue_thermal_printer/example/build" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/blue_thermal_printer/example/ios/.symlinks/plugins/blue_thermal_printer/.dart_tool" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/blue_thermal_printer/example/ios/.symlinks/plugins/blue_thermal_printer/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/blue_thermal_printer/example/ios/.symlinks/plugins/blue_thermal_printer/build" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/blue_thermal_printer/example/ios/.symlinks/plugins/blue_thermal_printer/example/.dart_tool" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/blue_thermal_printer/example/ios/.symlinks/plugins/blue_thermal_printer/example/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/blue_thermal_printer/example/ios/.symlinks/plugins/blue_thermal_printer/example/build" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/path_provider_ios/.dart_tool" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/path_provider_ios/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/path_provider_ios/build" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/path_provider_ios/example/.dart_tool" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/path_provider_ios/example/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/.symlinks/plugins/path_provider_ios/example/build" />
+    </content>
+    <orderEntry type="jdk" jdkName="1.8" jdkType="JavaSDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="Dart SDK" level="project" />
+    <orderEntry type="library" name="Flutter Plugins" level="project" />
+  </component>
+</module>
\ No newline at end of file

bluethermalprinter.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/lib" isTestSource="false" />
+      <excludeFolder url="file://$MODULE_DIR$/.dart_tool" />
+      <excludeFolder url="file://$MODULE_DIR$/.idea" />
+      <excludeFolder url="file://$MODULE_DIR$/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/build" />
+      <excludeFolder url="file://$MODULE_DIR$/example/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/example/build" />
+    </content>
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="Dart Packages" level="project" />
+    <orderEntry type="library" name="Dart SDK" level="project" />
+    <orderEntry type="library" name="Flutter Plugins" level="project" />
+  </component>
+</module>
\ No newline at end of file

example/.gitignore

+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# Visual Studio Code related
+.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Android related
+**/android/**/gradle-wrapper.jar
+**/android/.gradle
+**/android/captures/
+**/android/gradlew
+**/android/gradlew.bat
+**/android/local.properties
+**/android/**/GeneratedPluginRegistrant.java
+
+# iOS/XCode related
+**/ios/**/*.mode1v3
+**/ios/**/*.mode2v3
+**/ios/**/*.moved-aside
+**/ios/**/*.pbxuser
+**/ios/**/*.perspectivev3
+**/ios/**/*sync/
+**/ios/**/.sconsign.dblite
+**/ios/**/.tags*
+**/ios/**/.vagrant/
+**/ios/**/DerivedData/
+**/ios/**/Icon?
+**/ios/**/Pods/
+**/ios/**/.symlinks/
+**/ios/**/profile
+**/ios/**/xcuserdata
+**/ios/.generated/
+**/ios/Flutter/App.framework
+**/ios/Flutter/Flutter.framework
+**/ios/Flutter/Generated.xcconfig
+**/ios/Flutter/app.flx
+**/ios/Flutter/app.zip
+**/ios/Flutter/flutter_assets/
+**/ios/ServiceDefinitions.json
+**/ios/Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!**/ios/**/default.mode1v3
+!**/ios/**/default.mode2v3
+!**/ios/**/default.pbxuser
+!**/ios/**/default.perspectivev3
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages

example/.metadata

+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: 7a4c33425ddd78c54aba07d86f3f9a4a0051769b
+  channel: stable
+
+project_type: app

example/README.md

+# blue_thermal_printer_example
+
+Demonstrates how to use the blue_thermal_printer plugin.
+
+## Getting Started
+
+    import 'dart:io';
+    import 'dart:typed_data';
+    import 'package:flutter/material.dart';
+    import 'dart:async';
+    import 'package:blue_thermal_printer/blue_thermal_printer.dart';
+    import 'package:flutter/services.dart';
+    import 'package:path_provider/path_provider.dart';
+
+    void main() => runApp(new MyApp());
+
+    class MyApp extends StatefulWidget {
+     @override
+     _MyAppState createState() => new _MyAppState();
+    }
+
+    class _MyAppState extends State<MyApp> {
+
+      BlueThermalPrinter bluetooth = BlueThermalPrinter.instance;
+
+      List<BluetoothDevice> _devices = [];
+      BluetoothDevice _device;
+      bool _connected = false;
+      bool _pressed = false;
+      String pathImage;
+
+      @override
+      void initState() {
+       super.initState();
+       initPlatformState();
+       initSavetoPath();
+      }
+
+     initSavetoPath()async{
+        //read and write
+        //image max 300px X 300px
+        final filename = 'yourlogo.png';
+        var bytes = await rootBundle.load("assets/images/yourlogo.png");
+        String dir = (await getApplicationDocumentsDirectory()).path;
+        writeToFile(bytes,'$dir/$filename');
+        setState(() {
+         pathImage='$dir/$filename';
+       });
+     }
+
+
+      Future<void> initPlatformState() async {
+        List<BluetoothDevice> devices = [];
+
+       try {
+         devices = await bluetooth.getBondedDevices();
+       } on PlatformException {
+         // TODO - Error
+       }
+
+       bluetooth.onStateChanged().listen((state) {
+         switch (state) {
+            case BlueThermalPrinter.CONNECTED:
+              setState(() {
+                _connected = true;
+                _pressed = false;
+             });
+             break;
+            case BlueThermalPrinter.DISCONNECTED:
+             setState(() {
+               _connected = false;
+               _pressed = false;
+              });
+             break;
+            default:
+              print(state);
+              break;
+         }
+       });
+
+        if (!mounted) return;
+       setState(() {
+          _devices = devices;
+       });
+      }
+
+     @override
+     Widget build(BuildContext context) {
+        return MaterialApp(
+          home: Scaffold(
+            appBar: AppBar(
+              title: Text('Blue Thermal Printer'),
+           ),
+            body: Container(
+             child: ListView(
+               children: <Widget>[
+                 Padding(
+                   padding: const EdgeInsets.fromLTRB(10.0, 10.0, 10.0, 0.0),
+                   child: Row(
+                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
+                     children: <Widget>[
+                       Text(
+                          'Device:',
+                         style: TextStyle(
+                            fontWeight: FontWeight.bold,
+                         ),
+                        ),
+                       DropdownButton(
+                          items: _getDeviceItems(),
+                          onChanged: (value) => setState(() => _device = value),
+                          value: _device,
+                       ),
+                       RaisedButton(
+                          onPressed:
+                         _pressed ? null : _connected ? _disconnect : _connect,
+                          child: Text(_connected ? 'Disconnect' : 'Connect'),
+                        ),
+                     ],
+                   ),
+                 ),
+                  Padding(
+                    padding: const EdgeInsets.only(left: 10.0, right: 10.0, top: 50),
+                    child:  RaisedButton(
+                      onPressed: _connected ? _tesPrint : null,
+                     child: Text('TesPrint'),
+                   ),
+                 ),
+                ],
+             ),
+            ),
+         ),
+       );
+     }
+
+
+      List<DropdownMenuItem<BluetoothDevice>> _getDeviceItems() {
+        List<DropdownMenuItem<BluetoothDevice>> items = [];
+       if (_devices.isEmpty) {
+         items.add(DropdownMenuItem(
+           child: Text('NONE'),
+         ));
+        } else {
+         _devices.forEach((device) {
+           items.add(DropdownMenuItem(
+            child: Text(device.name),
+              value: device,
+           ));
+         });
+       }
+       return items;
+      }
+
+
+     void _connect() {
+        if (_device == null) {
+         show('No device selected.');
+       } else {
+          bluetooth.isConnected.then((isConnected) {
+           if (!isConnected) {
+              bluetooth.connect(_device).catchError((error) {
+               setState(() => _pressed = false);
+             });
+             setState(() => _pressed = true);
+           }
+          });
+        }
+     }
+
+
+      void _disconnect() {
+        bluetooth.disconnect();
+        setState(() => _pressed = true);
+     }
+
+    //write to app path
+     Future<void> writeToFile(ByteData data, String path) {
+        final buffer = data.buffer;
+        return new File(path).writeAsBytes(
+            buffer.asUint8List(data.offsetInBytes, data.lengthInBytes));
+     }
+
+      void _tesPrint() async {
+        //SIZE
+        // 0- normal size text
+        // 1- only bold text
+       // 2- bold with medium text
+       // 3- bold with large text
+       //ALIGN
+       // 0- ESC_ALIGN_LEFT
+       // 1- ESC_ALIGN_CENTER
+        // 2- ESC_ALIGN_RIGHT
+        bluetooth.isConnected.then((isConnected) {
+          if (isConnected) {
+            bluetooth.printCustom("HEADER",3,1);
+            bluetooth.printNewLine();
+            bluetooth.printImage(pathImage);
+            bluetooth.printNewLine();
+            bluetooth.printLeftRight("LEFT", "RIGHT",0);
+            bluetooth.printLeftRight("LEFT", "RIGHT",1);
+            bluetooth.printNewLine();
+            bluetooth.printLeftRight("LEFT", "RIGHT",2);
+            bluetooth.printCustom("Body left",1,0);
+            bluetooth.printCustom("Body right",0,2);
+            bluetooth.printNewLine();
+            bluetooth.printCustom("Terimakasih",2,1);
+            bluetooth.printNewLine();
+            bluetooth.printQRcode("Insert Your Own Text to Generate");
+            bluetooth.printNewLine();
+            bluetooth.printNewLine();
+            bluetooth.paperCut();
+       });
+      }
+
+
+     Future show(
+          String message, {
+           Duration duration: const Duration(seconds: 3),
+          }) async {
+        await new Future.delayed(new Duration(milliseconds: 100));
+       Scaffold.of(context).showSnackBar(
+          new SnackBar(
+            content: new Text(
+              message,
+             style: new TextStyle(
+                color: Colors.white,
+              ),
+           ),
+            duration: duration,
+          ),
+        );
+     }
+    }

example/analysis_options.yaml

+# This file configures the analyzer, which statically analyzes Dart code to
+# check for errors, warnings, and lints.
+#
+# The issues identified by the analyzer are surfaced in the UI of Dart-enabled
+# IDEs (https://dart.dev/tools#ides-and-editors). The analyzer can also be
+# invoked from the command line by running `flutter analyze`.
+
+# The following line activates a set of recommended lints for Flutter apps,
+# packages, and plugins designed to encourage good coding practices.
+include: package:flutter_lints/flutter.yaml
+
+linter:
+  # The lint rules applied to this project can be customized in the
+  # section below to disable rules from the `package:flutter_lints/flutter.yaml`
+  # included above or to enable additional rules. A list of all available lints
+  # and their documentation is published at
+  # https://dart-lang.github.io/linter/lints/index.html.
+  #
+  # Instead of disabling a lint rule for the entire project in the
+  # section below, it can also be suppressed for a single line of code
+  # or a specific dart file by using the `// ignore: name_of_lint` and
+  # `// ignore_for_file: name_of_lint` syntax on the line or in the file
+  # producing the lint.
+  rules:
+    # avoid_print: false  # Uncomment to disable the `avoid_print` rule
+    # prefer_single_quotes: true  # Uncomment to enable the `prefer_single_quotes` rule
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options

example/android/.gitignore

+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/docs/deployment/android#reference-the-keystore-from-the-app
+key.properties
+**/*.keystore
+**/*.jks

example/android/app/build.gradle

+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterRoot = localProperties.getProperty('flutter.sdk')
+if (flutterRoot == null) {
+    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+apply plugin: 'com.android.application'
+apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+android {
+    compileSdkVersion 30
+
+    lintOptions {
+        disable 'InvalidPackage'
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId "id.kakzaki.blue_thermal_printer_example"
+        minSdkVersion 18
+        targetSdkVersion 30
+        multiDexEnabled true
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig signingConfigs.debug
+        }
+    }
+    buildToolsVersion '29.0.2'
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test:runner:1.3.0-alpha02'
+    implementation 'com.android.support:multidex:1.0.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0-alpha02'
+}

example/android/app/src/debug/AndroidManifest.xml

+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="id.kakzaki.blue_thermal_printer_example">
+    <!-- Flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

example/android/app/src/main/AndroidManifest.xml

+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="id.kakzaki.blue_thermal_printer_example">
+
+    <uses-permission android:name="android.permission.INTERNET"/>
+
+    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
+         calls FlutterMain.startInitialization(this); in its onCreate method.
+         In most cases you can leave this as-is, but you if you want to provide
+         additional functionality it is fine to subclass or reimplement
+         FlutterApplication and put your custom class here. -->
+    <application
+        android:label="blue_thermal_printer_example"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:launchMode="singleTop"
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- This keeps the window background of the activity showing
+                 until Flutter renders its first frame. It can be removed if
+                 there is no splash screen (such as the default splash screen
+                 defined in @style/LaunchTheme). -->
+            <meta-data
+                android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
+                android:value="true" />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+</manifest>

example/android/app/src/main/java/id/kakzaki/blue_thermal_printer_example/MainActivity.java

+package id.kakzaki.blue_thermal_printer_example;
+
+import io.flutter.embedding.android.FlutterActivity;
+
+public class MainActivity extends FlutterActivity {
+}

example/android/app/src/main/kotlin/id/kakzaki/bluethermalprinter_example/MainActivity.kt

+package id.kakzaki.bluethermalprinter_example
+
+import io.flutter.embedding.android.FlutterActivity
+
+class MainActivity: FlutterActivity() {
+}

example/android/app/src/main/res/drawable-v21/launch_background.xml

+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="?android:colorBackground" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

example/android/app/src/main/res/drawable/launch_background.xml

+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

example/android/app/src/main/res/values-night/styles.xml

+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is on -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             Flutter draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

example/android/app/src/main/res/values/styles.xml

+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             Flutter draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+</resources>

example/android/app/src/profile/AndroidManifest.xml

+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="id.kakzaki.blue_thermal_printer_example">
+    <!-- Flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

example/android/build.gradle

+buildscript {
+    repositories {
+        google()
+        jcenter()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.5.0'
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+rootProject.buildDir = '../build'
+subprojects {
+    project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
+    project.evaluationDependsOn(':app')
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

example/android/gradle.properties

+android.enableJetifier=true
+android.useAndroidX=true
+org.gradle.jvmargs=-Xmx1536M
+android.enableR8=true
\ No newline at end of file

example/android/gradle/wrapper/gradle-wrapper.properties

+#Fri Aug 30 12:26:22 BRT 2019
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip

example/android/settings.gradle

+include ':app'
+
+def flutterProjectRoot = rootProject.projectDir.parentFile.toPath()
+
+def plugins = new Properties()
+def pluginsFile = new File(flutterProjectRoot.toFile(), '.flutter-plugins')
+if (pluginsFile.exists()) {
+    pluginsFile.withReader('UTF-8') { reader -> plugins.load(reader) }
+}
+
+plugins.each { name, path ->
+    def pluginDirectory = flutterProjectRoot.resolve(path).resolve('android').toFile()
+    include ":$name"
+    project(":$name").projectDir = pluginDirectory
+}

example/ios/.gitignore

+**/dgph
+*.mode1v3
+*.mode2v3
+*.moved-aside
+*.pbxuser
+*.perspectivev3
+**/*sync/
+.sconsign.dblite
+.tags*
+**/.vagrant/
+**/DerivedData/
+Icon?
+**/Pods/
+**/.symlinks/
+profile
+xcuserdata
+**/.generated/
+Flutter/App.framework
+Flutter/Flutter.framework
+Flutter/Flutter.podspec
+Flutter/Generated.xcconfig
+Flutter/ephemeral/
+Flutter/app.flx
+Flutter/app.zip
+Flutter/flutter_assets/
+Flutter/flutter_export_environment.sh
+ServiceDefinitions.json
+Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!default.mode1v3
+!default.mode2v3
+!default.pbxuser
+!default.perspectivev3

example/ios/Flutter/AppFrameworkInfo.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>en</string>
+  <key>CFBundleExecutable</key>
+  <string>App</string>
+  <key>CFBundleIdentifier</key>
+  <string>io.flutter.flutter.app</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>App</string>
+  <key>CFBundlePackageType</key>
+  <string>FMWK</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleSignature</key>
+  <string>????</string>
+  <key>CFBundleVersion</key>
+  <string>1.0</string>
+  <key>MinimumOSVersion</key>
+  <string>9.0</string>
+</dict>
+</plist>

example/ios/Flutter/Debug.xcconfig

+#include "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
+#include "Generated.xcconfig"

example/ios/Flutter/Release.xcconfig

+#include "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
+#include "Generated.xcconfig"

example/ios/Podfile

+# Uncomment this line to define a global platform for your project
+# platform :ios, '9.0'
+
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
+
+project 'Runner', {
+  'Debug' => :debug,
+  'Profile' => :release,
+  'Release' => :release,
+}
+
+def flutter_root
+  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), __FILE__)
+  unless File.exist?(generated_xcode_build_settings_path)
+    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
+  end
+
+  File.foreach(generated_xcode_build_settings_path) do |line|
+    matches = line.match(/FLUTTER_ROOT\=(.*)/)
+    return matches[1].strip if matches
+  end
+  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get"
+end
+
+require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)
+
+flutter_ios_podfile_setup
+
+target 'Runner' do
+  use_frameworks!
+  use_modular_headers!
+  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
+end
+
+post_install do |installer|
+  installer.pods_project.targets.each do |target|
+    flutter_additional_ios_build_settings(target)
+    target.build_configurations.each do |config|
+      config.build_settings['ENABLE_BITCODE'] = 'NO'
+    end
+  end
+end

example/ios/Podfile.lock

+PODS:
+  - blue_thermal_printer (0.0.1):
+    - Flutter
+  - Flutter (1.0.0)
+  - path_provider_ios (0.0.1):
+    - Flutter
+
+DEPENDENCIES:
+  - blue_thermal_printer (from `.symlinks/plugins/blue_thermal_printer/ios`)
+  - Flutter (from `Flutter`)
+  - path_provider_ios (from `.symlinks/plugins/path_provider_ios/ios`)
+
+EXTERNAL SOURCES:
+  blue_thermal_printer:
+    :path: ".symlinks/plugins/blue_thermal_printer/ios"
+  Flutter:
+    :path: Flutter
+  path_provider_ios:
+    :path: ".symlinks/plugins/path_provider_ios/ios"
+
+SPEC CHECKSUMS:
+  blue_thermal_printer: 5702a6b03759a69281a7f27f0001130089c584f4
+  Flutter: 50d75fe2f02b26cc09d224853bb45737f8b3214a
+  path_provider_ios: 14f3d2fd28c4fdb42f44e0f751d12861c43cee02
+
+PODFILE CHECKSUM: e4aed95c7aa3e0620ec6419ead01fe8977619d0a
+
+COCOAPODS: 1.11.3

example/ios/Runner.xcodeproj/project.pbxproj

+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 50;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */ = {isa = PBXBuildFile; fileRef = 1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */; };
+		3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */ = {isa = PBXBuildFile; fileRef = 3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */; };
+		48B6B50EF7BDF68AD9BE3DD3 /* Pods_Runner.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 8BEF83EA25F4065C8374E741 /* Pods_Runner.framework */; };
+		74858FAF1ED2DC5600515810 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 74858FAE1ED2DC5600515810 /* AppDelegate.swift */; };
+		9740EEB41CF90195004384FC /* Debug.xcconfig in Resources */ = {isa = PBXBuildFile; fileRef = 9740EEB21CF90195004384FC /* Debug.xcconfig */; };
+		97C146FC1CF9000F007C117D /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FA1CF9000F007C117D /* Main.storyboard */; };
+		97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FD1CF9000F007C117D /* Assets.xcassets */; };
+		97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */; };
+/* End PBXBuildFile section */
+
+/* Begin PBXCopyFilesBuildPhase section */
+		9705A1C41CF9048500538489 /* Embed Frameworks */ = {
+			isa = PBXCopyFilesBuildPhase;
+			buildActionMask = 2147483647;
+			dstPath = "";
+			dstSubfolderSpec = 10;
+			files = (
+			);
+			name = "Embed Frameworks";
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXCopyFilesBuildPhase section */
+
+/* Begin PBXFileReference section */
+		1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GeneratedPluginRegistrant.h; sourceTree = "<group>"; };
+		1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GeneratedPluginRegistrant.m; sourceTree = "<group>"; };
+		3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = "<group>"; };
+		499AE47CC5974DAE43E30C83 /* Pods-Runner.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.release.xcconfig"; path = "Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"; sourceTree = "<group>"; };
+		74858FAD1ED2DC5600515810 /* Runner-Bridging-Header.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "Runner-Bridging-Header.h"; sourceTree = "<group>"; };
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+				);
+				PRODUCT_BUNDLE_IDENTIFIER = id.kakzaki.blueThermalPrinterExample;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
+				TARGETED_DEVICE_FAMILY = 1;
+				VERSIONING_SYSTEM = "apple-generic";
+			};
+			name = Debug;
+		};
+		97C147071CF9000F007C117D /* Release */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 7AFA3C8E1D35360C0083082E /* Release.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
+				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
+				DEVELOPMENT_TEAM = JYL43SXW4K;
+				ENABLE_BITCODE = NO;
+				FRAMEWORK_SEARCH_PATHS = (
+					"$(inherited)",
+					"$(PROJECT_DIR)/Flutter",
+				);
+				INFOPLIST_FILE = Runner/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
+				LIBRARY_SEARCH_PATHS = (
+					"$(inherited)",
+					"$(PROJECT_DIR)/Flutter",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = id.kakzaki.blueThermalPrinterExample;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
+				TARGETED_DEVICE_FAMILY = 1;
+				VERSIONING_SYSTEM = "apple-generic";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		97C146E91CF9000F007C117D /* Build configuration list for PBXProject "Runner" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				97C147031CF9000F007C117D /* Debug */,
+				97C147041CF9000F007C117D /* Release */,
+				249021D3217E4FDB00AE95B9 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		97C147051CF9000F007C117D /* Build configuration list for PBXNativeTarget "Runner" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				97C147061CF9000F007C117D /* Debug */,
+				97C147071CF9000F007C117D /* Release */,
+				249021D4217E4FDB00AE95B9 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 97C146E61CF9000F007C117D /* Project object */;
+}

example/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata

+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>

example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1300"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+               BuildableName = "Runner.app"
+               BlueprintName = "Runner"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Profile"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

example/ios/Runner.xcworkspace/contents.xcworkspacedata

+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+   <FileRef
+      location = "group:Pods/Pods.xcodeproj">
+   </FileRef>
+</Workspace>

example/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

example/ios/Runner/AppDelegate.swift

+import UIKit
+import Flutter
+
+@UIApplicationMain
+@objc class AppDelegate: FlutterAppDelegate {
+  override func application(
+    _ application: UIApplication,
+    didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?
+  ) -> Bool {
+    GeneratedPluginRegistrant.register(with: self)
+    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
+  }
+}

example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json

+{
+  "images" : [
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "83.5x83.5",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-83.5x83.5@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "1024x1024",
+      "idiom" : "ios-marketing",
+      "filename" : "Icon-App-1024x1024@1x.png",
+      "scale" : "1x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

example/ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json

+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

example/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md

+# Launch Screen Assets
+
+You can customize the launch screen with your own desired assets by replacing the image files in this directory.
+
+You can also do it by opening your Flutter project's Xcode project with `open ios/Runner.xcworkspace`, selecting `Runner/Assets.xcassets` in the Project Navigator and dropping in the desired images.
\ No newline at end of file

example/ios/Runner/Base.lproj/LaunchScreen.storyboard

+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12121" systemVersion="16G29" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12089"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Ydg-fD-yQy"/>
+                        <viewControllerLayoutGuide type="bottom" id="xbc-2k-c8Z"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" image="LaunchImage" translatesAutoresizingMaskIntoConstraints="NO" id="YRO-k0-Ey4">
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerX" secondItem="Ze5-6b-2t3" secondAttribute="centerX" id="1a2-6s-vTC"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="centerY" id="4X2-HB-R7a"/>
+                        </constraints>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="LaunchImage" width="168" height="185"/>
+    </resources>
+</document>

example/ios/Runner/Base.lproj/Main.storyboard

+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+    </dependencies>
+    <scenes>
+        <!--Flutter View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="FlutterViewController" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
+                        <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

example/ios/Runner/Info.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>blue_thermal_printer_example</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>$(FLUTTER_BUILD_NAME)</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>$(FLUTTER_BUILD_NUMBER)</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>NSAppTransportSecurity</key>
+	<dict>
+		<key>NSAllowsArbitraryLoads</key>
+		<true/>
+	</dict>
+	<key>NSBluetoothAlwaysUsageDescription</key>
+	<string>Allow App use bluetooth?</string>
+	<key>NSBluetoothPeripheralUsageDescription</key>
+	<string>蓝牙打印机功能需要您开启蓝牙，并允许该应用使用。</string>
+	<key>UIBackgroundModes</key>
+	<array>
+		<string>bluetooth-central</string>
+		<string>bluetooth-peripheral</string>
+	</array>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UIViewControllerBasedStatusBarAppearance</key>
+	<false/>
+	<key>io.flutter.embedded_views_preview</key>
+	<true/>
+</dict>
+</plist>

example/ios/Runner/Runner-Bridging-Header.h

+#import "GeneratedPluginRegistrant.h"
\ No newline at end of file

example/lib/main.dart

+import 'dart:io';
+
+import 'package:blue_thermal_printer/blue_thermal_printer.dart';
+import 'package:blue_thermal_printer_example/testprint.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+
+void main() => runApp(new MyApp());
+
+class MyApp extends StatefulWidget {
+  @override
+  _MyAppState createState() => new _MyAppState();
+}
+
+class _MyAppState extends State<MyApp> {
+  BlueThermalPrinter bluetooth = BlueThermalPrinter.instance;
+
+  List<BluetoothDevice> _devices = [];
+  BluetoothDevice _device;
+  bool _connected = false;
+  String pathImage;
+  TestPrint testPrint;
+
+  @override
+  void initState() {
+    super.initState();
+    initPlatformState();
+    testPrint = TestPrint();
+  }
+
+  Future<void> initPlatformState() async {
+    bool isConnected = await bluetooth.isConnected;
+    List<BluetoothDevice> devices = [];
+    try {
+      devices = await bluetooth.getBondedDevices();
+    } on PlatformException {
+      // TODO - Error
+    }
+
+    bluetooth.onStateChanged().listen((state) {
+      print("蓝牙状态：$state");
+      switch (state) {
+        case BlueThermalPrinter.CONNECTED:
+          setState(() {
+            _connected = true;
+          });
+          break;
+        case BlueThermalPrinter.DISCONNECTED:
+          setState(() {
+            _connected = false;
+          });
+          break;
+        default:
+          print(state);
+          break;
+      }
+    });
+
+    bluetooth.onRead().listen((event) {
+      print("打印状态：$event");
+    });
+
+    if (!mounted) return;
+    setState(() {
+      _devices = devices;
+    });
+
+    if (isConnected) {
+      setState(() {
+        _connected = true;
+      });
+    }
+
+    if (defaultTargetPlatform == TargetPlatform.iOS) {
+      await bluetooth.repeatScan();
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Scaffold(
+        appBar: AppBar(
+          title: Text('Blue Thermal Printer'),
+        ),
+        body: Container(
+          child: Padding(
+            padding: const EdgeInsets.all(8.0),
+            child: ListView(
+              children: <Widget>[
+                Row(
+                  crossAxisAlignment: CrossAxisAlignment.center,
+                  mainAxisAlignment: MainAxisAlignment.start,
+                  children: <Widget>[
+                    SizedBox(
+                      width: 10,
+                    ),
+                    Text(
+                      'Device:',
+                      style: TextStyle(
+                        fontWeight: FontWeight.bold,
+                      ),
+                    ),
+                    SizedBox(
+                      width: 30,
+                    ),
+                    Expanded(
+                      child: DropdownButton(
+                        items: _getDeviceItems(),
+                        onChanged: (value) => setState(() => _device = value),
+                        value: _device,
+                      ),
+                    ),
+                  ],
+                ),
+                SizedBox(
+                  height: 10,
+                ),
+                Row(
+                  crossAxisAlignment: CrossAxisAlignment.center,
+                  mainAxisAlignment: MainAxisAlignment.end,
+                  children: <Widget>[
+                    ElevatedButton(
+                      style: ElevatedButton.styleFrom(primary: Colors.brown),
+                      onPressed: () {
+                        initPlatformState();
+                        bluetooth.getLastDevice().then((value) {
+                          print("上台设备：$value");
+                        });
+                      },
+                      child: Text(
+                        '刷新',
+                        style: TextStyle(color: Colors.white),
+                      ),
+                    ),
+                    SizedBox(
+                      width: 20,
+                    ),
+                    ElevatedButton(
+                      style: ElevatedButton.styleFrom(
+                          primary: _connected ? Colors.red : Colors.green),
+                      onPressed: _connected ? _disconnect : _connect,
+                      child: Text(
+                        _connected ? '断开' : '连接',
+                        style: TextStyle(color: Colors.white),
+                      ),
+                    ),
+                  ],
+                ),
+                Padding(
+                  padding:
+                      const EdgeInsets.only(left: 10.0, right: 10.0, top: 50),
+                  child: ElevatedButton(
+                    style: ElevatedButton.styleFrom(primary: Colors.brown),
+                    onPressed: () {
+                      testPrint.sample();
+                    },
+                    child: Text('打印', style: TextStyle(color: Colors.white)),
+                  ),
+                ),
+                Padding(
+                  padding:
+                  const EdgeInsets.only(left: 10.0, right: 10.0, top: 10),
+                  child: ElevatedButton(
+                    style: ElevatedButton.styleFrom(primary: Colors.brown),
+                    onPressed: () {
+                      testPrint.sample1();
+                    },
+                    child: Text('打印(tsc)', style: TextStyle(color: Colors.white)),
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  List<DropdownMenuItem<BluetoothDevice>> _getDeviceItems() {
+    List<DropdownMenuItem<BluetoothDevice>> items = [];
+    if (_devices.isEmpty) {
+      items.add(DropdownMenuItem(
+        child: Text('NONE'),
+      ));
+    } else {
+      _devices.forEach((device) {
+        items.add(DropdownMenuItem(
+          child: Text(device.name),
+          value: device,
+        ));
+      });
+    }
+    return items;
+  }
+
+  void _connect() {
+    if (_device == null) {
+      show('No device selected.');
+    } else {
+      bluetooth.isConnected.then((isConnected) {
+        if (!isConnected) {
+          bluetooth.connect(_device).catchError((error) {
+            setState(() => _connected = false);
+          });
+          setState(() => _connected = true);
+        }
+      });
+    }
+  }
+
+  void _disconnect() {
+    bluetooth.disconnect();
+    print("断开");
+    setState(() => _connected = true);
+  }
+
+//write to app path
+  Future<void> writeToFile(ByteData data, String path) {
+    final buffer = data.buffer;
+    return new File(path).writeAsBytes(
+        buffer.asUint8List(data.offsetInBytes, data.lengthInBytes));
+  }
+
+  Future show(
+    String message, {
+    Duration duration: const Duration(seconds: 3),
+  }) async {
+    await new Future.delayed(new Duration(milliseconds: 100));
+    ScaffoldMessenger.of(context).showSnackBar(
+      new SnackBar(
+        content: new Text(
+          message,
+          style: new TextStyle(
+            color: Colors.white,
+          ),
+        ),
+        duration: duration,
+      ),
+    );
+  }
+}

example/lib/testprint.dart

+import 'package:blue_thermal_printer/blue_thermal_printer.dart';
+import 'package:dio/dio.dart';
+
+class TestPrint {
+  BlueThermalPrinter bluetooth = BlueThermalPrinter.instance;
+
+  sample() async {
+    bluetooth.isConnected.then((isConnected) async {
+      if (isConnected) {
+        // for (var i = 0; i < 5; i++) {
+        List<int> data = [];
+        var barcode =
+            await bluetooth.getBarCode("02345678901234567890", 300, 120, 0);
+
+        data.addAll(PrintData.initPrinter());
+        data.addAll(PrintData.printText("采样编码", size: 3, bold: true, space: 1));
+        data.addAll(PrintData.printNewLine());
+        data.addAll(PrintData.printText("VIP添加样", size: 2));
+        data.addAll(PrintData.printNewLine());
+        data.addAll(PrintData.printText("硫/量热仪/灰分"));
+        data.addAll(PrintData.printNewLine());
+        data.addAll(PrintData.printNewLine());
+        data.addAll(PrintData.printMarginLeft(11));
+        data.addAll(PrintData.printQRCode("02345678901234567890"));
+        data.addAll(PrintData.printNewLine());
+        data.addAll(PrintData.printNewLine());
+        data.addAll(PrintData.printNewLine());
+        data.addAll(PrintData.printMarginLeft(5));
+        data.addAll(barcode);
+        data.addAll(PrintData.printNewLine());
+        data.addAll(PrintData.printNewLine());
+        data.addAll(PrintData.printNewLine());
+        data.addAll(PrintData.printText("马上来货运"));
+        data.addAll(PrintData.printNewLine());
+        data.addAll(PrintData.printNewLine());
+        data.addAll(PrintData.printNewLine());
+        bluetooth.writeBytes(Uint8List.fromList(data));
+        await Future.delayed(Duration(milliseconds: 500));
+        // }
+      }
+    });
+  }
+
+  sample1() async {
+    bluetooth.isConnected.then((isConnected) async {
+      if (isConnected) {
+        Map<String, dynamic> config = Map();
+        config['width'] = 100; // 标签宽度，单位mm
+        config['height'] = 150; // 标签高度，单位mm
+        config['gap'] = 2; // 标签间隔，单位mm
+
+        List<Map<String, dynamic>> data = [];
+        //ByteData imageByte = await rootBundle.load("assets/images/WechatIMG91.png");
+        // List<int> imageBytes = imageByte.buffer.asUint8List(imageByte.offsetInBytes, imageByte.lengthInBytes);
+        // String base64Image = base64Encode(imageBytes);
+
+        // 下载远程图片，转换为字节流
+        var str = "https://img1.baidu.com/it/u=873106765,2587410047&fm=253&fmt=auto&app=138&f=JPEG?w=530&h=500";
+        Response<List<int>> rs = await Dio().get<List<int>>(
+          str,
+          options: Options(
+            responseType: ResponseType.bytes,
+          ),
+        );
+        String base64Image = base64Encode(rs.data);
+
+        //打印配置
+        Map<String, dynamic> image = Map();
+        image['type'] = 'image';
+        image['x'] = 0;
+        image['y'] = 0;
+        image['width'] = 800;
+        image['content'] = base64Image;
+        data.add(image);
+        bluetooth.printTSCImage(config, data);
+        await Future.delayed(Duration(milliseconds: 500));
+      }
+    });
+  }
+}

example/pubspec.lock

+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  async:
+    dependency: transitive
+    description:
+      name: async
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.8.2"
+  blue_thermal_printer:
+    dependency: "direct dev"
+    description:
+      path: ".."
+      relative: true
+    source: path
+    version: "1.3.0"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.0"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.0"
+  charcode:
+    dependency: transitive
+    description:
+      name: charcode
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.3.1"
+  clock:
+    dependency: transitive
+    description:
+      name: clock
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.0"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.16.0"
+  dio:
+    dependency: "direct main"
+    description:
+      name: dio
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "4.0.6"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.3.0"
+  fast_gbk:
+    dependency: transitive
+    description:
+      name: fast_gbk
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.0.0"
+  ffi:
+    dependency: transitive
+    description:
+      name: ffi
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.0.1"
+  file:
+    dependency: transitive
+    description:
+      name: file
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "6.1.4"
+  flutter:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  http_parser:
+    dependency: transitive
+    description:
+      name: http_parser
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "4.0.1"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.12.11"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.1.4"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.7.0"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.8.1"
+  path_provider:
+    dependency: "direct main"
+    description:
+      name: path_provider
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.0.11"
+  path_provider_android:
+    dependency: transitive
+    description:
+      name: path_provider_android
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.0.20"
+  path_provider_ios:
+    dependency: transitive
+    description:
+      name: path_provider_ios
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.0.11"
+  path_provider_linux:
+    dependency: transitive
+    description:
+      name: path_provider_linux
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.7"
+  path_provider_macos:
+    dependency: transitive
+    description:
+      name: path_provider_macos
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.0.6"
+  path_provider_platform_interface:
+    dependency: transitive
+    description:
+      name: path_provider_platform_interface
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.0.4"
+  path_provider_windows:
+    dependency: transitive
+    description:
+      name: path_provider_windows
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.3"
+  platform:
+    dependency: "direct main"
+    description:
+      name: platform
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "3.1.0"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.3"
+  process:
+    dependency: transitive
+    description:
+      name: process
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "4.2.4"
+  sky_engine:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.99"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.8.2"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.10.0"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.0"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.0"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.0"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.4.9"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.3.1"
+  vector_math:
+    dependency: transitive
+    description:
+      name: vector_math
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.2"
+  win32:
+    dependency: transitive
+    description:
+      name: win32
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "3.0.0"
+  xdg_directories:
+    dependency: transitive
+    description:
+      name: xdg_directories
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.2.0+2"
+sdks:
+  dart: ">=2.17.0 <3.0.0"
+  flutter: ">=3.0.0"

example/pubspec.yaml

+name: blue_thermal_printer_example
+description: Demonstrates how to use the blue_thermal_printer plugin.
+publish_to: https://pub.dev/packages/blue_thermal_printer
+
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+
+  # The following adds the Cupertino Icons font to your application.
+  # Use with the CupertinoIcons class for iOS style icons.
+  path_provider: ^2.0.5
+  platform: ^3.1.0
+  dio: ^4.0.6
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+  blue_thermal_printer:
+    path: ../
+
+
+# For information on the generic Dart part of this file, see the
+# following page: https://www.dartlang.org/tools/pub/pubspec
+
+# The following section is specific to Flutter.
+flutter:
+
+  # The following line ensures that the Material Icons font is
+  # included with your application, so that you can use the icons in
+  # the material Icons class.
+  uses-material-design: true
+
+  # To add assets to your application, add an assets section, like this:
+  assets:
+    - assets/images/yourlogo.png
+    - assets/images/bluetooth_print.png
+    - assets/images/WechatIMG72.jpeg
+    - assets/images/WechatIMG74.png
+    - assets/images/WechatIMG76.png
+    - assets/images/WechatIMG77.png
+    - assets/images/WechatIMG78.png
+    - assets/images/WechatIMG79.png
+    - assets/images/1663660235169.jpg
+    - assets/images/WechatIMG80.png
+    - assets/images/WechatIMG81.png
+    - assets/images/WechatIMG91.png
+    - assets/images/WechatIMG92.png
+    - assets/images/WechatIMG95.png
+  #  - images/a_dot_ham.jpeg
+
+  # An image asset can refer to one or more resolution-specific "variants", see
+  # https://flutter.dev/assets-and-images/#resolution-aware.
+
+  # For details regarding adding assets from package dependencies, see
+  # https://flutter.dev/assets-and-images/#from-packages
+
+  # To add custom fonts to your application, add a fonts section here,
+  # in this "flutter" section. Each entry in this list should have a
+  # "family" key with the font family name, and a "fonts" key with a
+  # list giving the asset and other descriptors for the font. For
+  # example:
+  # fonts:
+  #   - family: Schyler
+  #     fonts:
+  #       - asset: fonts/Schyler-Regular.ttf
+  #       - asset: fonts/Schyler-Italic.ttf
+  #         style: italic
+  #   - family: Trajan Pro
+  #     fonts:
+  #       - asset: fonts/TrajanPro.ttf
+  #       - asset: fonts/TrajanPro_Bold.ttf
+  #         weight: 700
+  #
+  # For details regarding fonts from package dependencies,
+  # see https://flutter.dev/custom-fonts/#from-packages

example/test/widget_test.dart

+// This is a basic Flutter widget test.
+//
+// To perform an interaction with a widget in your test, use the WidgetTester
+// utility that Flutter provides. For example, you can send tap and scroll
+// gestures. You can also use WidgetTester to find child widgets in the widget
+// tree, read text, and verify that the values of widget properties are correct.
+
+import 'package:blue_thermal_printer_example/main.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('Verify Platform version', (WidgetTester tester) async {
+    // Build our app and trigger a frame.
+    await tester.pumpWidget(MyApp());
+
+    // Verify that platform version is retrieved.
+    expect(
+      find.byWidgetPredicate(
+        (Widget widget) =>
+            widget is Text && widget.data.startsWith('Running on:'),
+      ),
+      findsOneWidget,
+    );
+  });
+}

example/web/index.html

+<!DOCTYPE html>
+<html>
+<head>
+  <!--
+    If you are serving your web app in a path other than the root, change the
+    href value below to reflect the base path you are serving from.
+
+    The path provided below has to start and end with a slash "/" in order for
+    it to work correctly.
+
+    For more details:
+    * https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base
+
+    This is a placeholder for base href that will be replaced by the value of
+    the `--base-href` argument provided to `flutter build`.
+  -->
+  <base href="$FLUTTER_BASE_HREF">
+
+  <meta charset="UTF-8">
+  <meta content="IE=Edge" http-equiv="X-UA-Compatible">
+  <meta name="description" content="Demonstrates how to use the bluethermalprinter plugin.">
+
+  <!-- iOS meta tags & icons -->
+  <meta name="apple-mobile-web-app-capable" content="yes">
+  <meta name="apple-mobile-web-app-status-bar-style" content="black">
+  <meta name="apple-mobile-web-app-title" content="bluethermalprinter_example">
+  <link rel="apple-touch-icon" href="icons/Icon-192.png">
+
+  <!-- Favicon -->
+  <link rel="icon" type="image/png" href="favicon.png"/>
+
+  <title>bluethermalprinter_example</title>
+  <link rel="manifest" href="manifest.json">
+</head>
+<body>
+  <!-- This script installs service_worker.js to provide PWA functionality to
+       application. For more information, see:
+       https://developers.google.com/web/fundamentals/primers/service-workers -->
+  <script>
+    var serviceWorkerVersion = null;
+    var scriptLoaded = false;
+    function loadMainDartJs() {
+      if (scriptLoaded) {
+        return;
+      }
+      scriptLoaded = true;
+      var scriptTag = document.createElement('script');
+      scriptTag.src = 'main.dart.js';
+      scriptTag.type = 'application/javascript';
+      document.body.append(scriptTag);
+    }
+
+    if ('serviceWorker' in navigator) {
+      // Service workers are supported. Use them.
+      window.addEventListener('load', function () {
+        // Wait for registration to finish before dropping the <script> tag.
+        // Otherwise, the browser will load the script multiple times,
+        // potentially different versions.
+        var serviceWorkerUrl = 'flutter_service_worker.js?v=' + serviceWorkerVersion;
+        navigator.serviceWorker.register(serviceWorkerUrl)
+          .then((reg) => {
+            function waitForActivation(serviceWorker) {
+              serviceWorker.addEventListener('statechange', () => {
+                if (serviceWorker.state == 'activated') {
+                  console.log('Installed new service worker.');
+                  loadMainDartJs();
+                }
+              });
+            }
+            if (!reg.active && (reg.installing || reg.waiting)) {
+              // No active web worker and we have installed or are installing
+              // one for the first time. Simply wait for it to activate.
+              waitForActivation(reg.installing || reg.waiting);
+            } else if (!reg.active.scriptURL.endsWith(serviceWorkerVersion)) {
+              // When the app updates the serviceWorkerVersion changes, so we
+              // need to ask the service worker to update.
+              console.log('New service worker available.');
+              reg.update();
+              waitForActivation(reg.installing);
+            } else {
+              // Existing service worker is still good.
+              console.log('Loading app from service worker.');
+              loadMainDartJs();
+            }
+          });
+
+        // If service worker doesn't succeed in a reasonable amount of time,
+        // fallback to plaint <script> tag.
+        setTimeout(() => {
+          if (!scriptLoaded) {
+            console.warn(
+              'Failed to load app from service worker. Falling back to plain <script> tag.',
+            );
+            loadMainDartJs();
+          }
+        }, 4000);
+      });
+    } else {
+      // Service workers not supported. Just drop the <script> tag.
+      loadMainDartJs();
+    }
+  </script>
+</body>
+</html>

example/web/manifest.json

+{
+    "name": "bluethermalprinter_example",
+    "short_name": "bluethermalprinter_example",
+    "start_url": ".",
+    "display": "standalone",
+    "background_color": "#0175C2",
+    "theme_color": "#0175C2",
+    "description": "Demonstrates how to use the bluethermalprinter plugin.",
+    "orientation": "portrait-primary",
+    "prefer_related_applications": false,
+    "icons": [
+        {
+            "src": "icons/Icon-192.png",
+            "sizes": "192x192",
+            "type": "image/png"
+        },
+        {
+            "src": "icons/Icon-512.png",
+            "sizes": "512x512",
+            "type": "image/png"
+        },
+        {
+            "src": "icons/Icon-maskable-192.png",
+            "sizes": "192x192",
+            "type": "image/png",
+            "purpose": "maskable"
+        },
+        {
+            "src": "icons/Icon-maskable-512.png",
+            "sizes": "512x512",
+            "type": "image/png",
+            "purpose": "maskable"
+        }
+    ]
+}

gradle.properties

+android.enableJetifier=true
+android.useAndroidX=true
\ No newline at end of file

ios/.gitignore

+.idea/
+.vagrant/
+.sconsign.dblite
+.svn/
+
+.DS_Store
+*.swp
+profile
+
+DerivedData/
+build/
+GeneratedPluginRegistrant.h
+GeneratedPluginRegistrant.m
+
+.generated/
+
+*.pbxuser
+*.mode1v3
+*.mode2v3
+*.perspectivev3
+
+!default.pbxuser
+!default.mode1v3
+!default.mode2v3
+!default.perspectivev3
+
+xcuserdata
+
+*.moved-aside
+
+*.pyc
+*sync/
+Icon?
+.tags*
+
+/Flutter/Generated.xcconfig

ios/Classes/BlueThermalPrinterPlugin.h

+#import <Flutter/Flutter.h>
+#import <CoreBluetooth/CoreBluetooth.h>
+
+#define NAMESPACE @"blue_thermal_printer"
+
+@interface BlueThermalPrinterPlugin : NSObject<FlutterPlugin, CBCentralManagerDelegate, CBPeripheralDelegate>
+@end
+
+@interface BluetoothPrintStreamHandler : NSObject<FlutterStreamHandler>
+@property FlutterEventSink sink;
+@end

ios/Classes/BlueThermalPrinterPlugin.m

+#import "BlueThermalPrinterPlugin.h"
+#import <blue_thermal_printer/blue_thermal_printer-Swift.h>
+#import "HLBLEManager.h"
+#import "HLPrinter.h"
+#import "TscCommand.h"
+
+@interface BlueThermalPrinterPlugin ()
+
+@property(nonatomic, retain) NSObject<FlutterPluginRegistrar> *registrar;
+@property(nonatomic, retain) FlutterMethodChannel *channel;
+@property(nonatomic, retain) BluetoothPrintStreamHandler *stateStreamHandler;
+@property(nonatomic) NSMutableDictionary *scannedPeripherals;
+
+@property (nonatomic, strong) HLBLEManager *manager;
+@property (nonatomic, strong) NSMutableArray *deviceArray;  /**< 蓝牙设备>*/
+@property (nonatomic, strong) NSString *lastDevice;
+@property (nonatomic, assign) BOOL isConnected;
+@property (assign, nonatomic) NSTimeInterval timeout;       /**< 默认超时时间 */
+
+@end
+
+@implementation BlueThermalPrinterPlugin
+
++ (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
+    //[SwiftBlueThermalPrinterPlugin registerWithRegistrar:registrar];
+    FlutterMethodChannel* channel = [FlutterMethodChannel
+                                     methodChannelWithName:NAMESPACE @"/methods"
+                                     binaryMessenger:[registrar messenger]];
+    FlutterEventChannel* stateChannel = [FlutterEventChannel eventChannelWithName:NAMESPACE @"/state" binaryMessenger:[registrar messenger]];
+    
+    BlueThermalPrinterPlugin* instance = [[BlueThermalPrinterPlugin alloc] init];
+    instance.channel = channel;
+    instance.scannedPeripherals = [NSMutableDictionary new];
+    
+    // 初始化数据
+    [instance setupData];
+    // 蓝牙模块
+    [instance initBluetoothToScan];
+    
+    // STATE
+    BluetoothPrintStreamHandler* stateStreamHandler = [[BluetoothPrintStreamHandler alloc] init];
+    [stateChannel setStreamHandler:stateStreamHandler];
+    instance.stateStreamHandler = stateStreamHandler;
+    [registrar addMethodCallDelegate:instance channel:channel];
+}
+
+- (void)handleMethodCall:(FlutterMethodCall *)call result:(FlutterResult)result {
+    NSLog(@"call method -> %@", call.method);
+    
+    NSDictionary *arguments = call.arguments;
+    __weak BlueThermalPrinterPlugin *weakSelf = self;
+    if ([@"state" isEqualToString:call.method]) {
+        result(nil);
+    }
+    else if([@"isAvailable" isEqualToString:call.method]) {
+        result(@(YES));
+    }
+    else if([@"isOn" isEqualToString:call.method]) {
+        result(@(YES));
+    }
+    else if([@"isConnected" isEqualToString:call.method]) {
+        result(@(weakSelf.isConnected));
+    }
+    else if([@"getLastDevice" isEqualToString:call.method]) {
+        NSString *lastDevice = [HLBLEManager UUIDStringForLastPeripheral];
+        @try {
+            result(lastDevice != nil ? lastDevice:@"");
+        } @catch (FlutterError *e) {
+            result(e);
+        }
+    }
+    else if([@"openSettings" isEqualToString:call.method]) {
+        
+    }
+    else if([@"getBondedDevices" isEqualToString:call.method]) {
+        result(weakSelf.deviceArray);
+    }
+    else if([@"connect" isEqualToString:call.method]) {
+        @try {
+            if ([arguments.allKeys containsObject:@"address"]) {
+                NSString *name = arguments[@"name"];
+                weakSelf.lastDevice = name;
+                NSLog(@"连接蓝牙名称：%@", name);
+                CBPeripheral *peripheral = [_scannedPeripherals objectForKey:[arguments objectForKey:@"address"]];
+                // 查询连接外围设备
+                [weakSelf connectBLEDevice:peripheral];
+            }
+            result(nil);
+        } @catch(FlutterError *e) {
+            result(e);
+        }
+    }
+    else if([@"disconnect" isEqualToString:call.method]) {
+        @try {
+            [weakSelf.manager cancelPeripheralConnection];
+            weakSelf.isConnected = NO;
+            result(nil);
+        } @catch(FlutterError *e) {
+            result(e);
+        }
+    }
+    else if([@"printSampleCode" isEqualToString:call.method]) {
+        @try {
+            [weakSelf sendPrintDataEvent:arguments];
+            result(nil);
+        } @catch(FlutterError *e) {
+            result(e);
+        }
+    }
+    else if([@"repeatScan" isEqualToString:call.method]) {
+        [weakSelf startScanPerpheralTimeout:10];
+        result(nil);
+    }
+    else if([@"writeBytes" isEqualToString:call.method]) {
+        @try {
+            if ([arguments.allKeys containsObject:@"message"]) {
+                FlutterStandardTypedData *bytesList = arguments[@"message"];
+                [weakSelf writeBytes:bytesList.data];
+            }
+            result(nil);
+        } @catch (FlutterError *e) {
+            result(e);
+        }
+    }
+    else if([@"getBarCode" isEqualToString:call.method]) {
+        @try {
+            if ([arguments.allKeys containsObject:@"textToBar"]) {
+                [weakSelf getBarCode:result arguments:arguments];
+            }
+            result(nil);
+        } @catch (FlutterError *e) {
+            result(e);
+        }
+    }
+    else if([@"printTSCImage" isEqualToString:call.method]) {
+        @try {
+            NSDictionary *args = [call arguments];
+            [weakSelf writeBytes:[self mapToTscCommand:args]];
+            result(nil);
+        } @catch(FlutterError *e) {
+            result(e);
+        }
+    }
+}
+
+#pragma mark - 打印 method
+
+- (void)writeBytes:(NSData *)mainData {
+    [self.manager sendPrintData:mainData completion:^(CBPeripheral *connectPerpheral, BOOL completion, NSString *error) {
+        NSLog(@"写入结：%d---错误:%@",completion,error);
+    }];
+}
+
+- (void)sendPrintDataEvent:(NSDictionary *)arguments {
+    HLPrinter *printer = [self getPrinter:arguments];
+    if (printer == nil) {
+        return;
+    }
+    NSData *mainData = [printer getFinalData];
+    [self.manager sendPrintData:mainData completion:^(CBPeripheral *connectPerpheral, BOOL completion, NSString *error) {
+        NSLog(@"写入结：%d---错误:%@",completion,error);
+    }];
+}
+
+- (HLPrinter *)getPrinter:(NSDictionary *)dict {
+    HLPrinter *printer = [[HLPrinter alloc] init];
+    NSString *qrcode = dict[@"qrcode"];
+    NSString *barcode = dict[@"barcode"];
+    NSString *middleTitle = dict[@"title"];             //小票title
+    NSString *subTitle = dict[@"subTitle"];             //小票subTitle
+    NSString *smallSubTitle = dict[@"smallSubTitle"];   //小票smallSubTitle
+    NSString *footerInfo = dict[@"bottomContent"];      //小票底部文案
+    
+    if (qrcode.length <= 0 || barcode.length <= 0) { return nil; }
+    /*
+     * 制作小票代码
+     */
+    if (middleTitle.length > 0) {
+        NSUInteger lengthT = [self stringEncode:middleTitle];
+        if (lengthT <= 16) {
+            if (lengthT % 2 == 0) { // 偶数
+                NSInteger offset = ceil((16 - lengthT)/2) * (48/2);
+                [printer appendTitle:@"" value:middleTitle valueOffset:offset fontSize:HLFontSizeTitleMiddle];
+            } else {
+                NSInteger offset = ceil((16 - lengthT)/2) * (54/2);
+                [printer appendTitle:@"" value:middleTitle valueOffset:offset fontSize:HLFontSizeTitleMiddle];
+            }
+        } else {
+            [printer appendTitle:@"" value:middleTitle valueOffset:0 fontSize:HLFontSizeTitleMiddle];
+        }
+    }
+    if (subTitle.length > 0) {
+        NSUInteger lengthT = [self stringEncode:subTitle];
+        if (lengthT <= 32) {
+            NSInteger offset = (32 - lengthT)/2 * (25/2);
+            [printer appendTitle:@"" value:subTitle valueOffset:offset fontSize:HLFontSizeTitleSmalle];
+        } else {
+            [printer appendTitle:@"" value:subTitle valueOffset:0 fontSize:HLFontSizeTitleSmalle];
+        }
+    }
+    if (smallSubTitle.length > 0) {
+        NSUInteger lengthT2 = [self stringEncode:smallSubTitle];
+        if (lengthT2 <= 32) {
+            NSInteger offset = (32 - lengthT2)/2 * (25/2);
+            [printer appendTitle:@"" value:smallSubTitle valueOffset:offset fontSize:HLFontSizeTitleSmalle];
+        } else {
+            [printer appendTitle:@"" value:smallSubTitle valueOffset:0 fontSize:HLFontSizeTitleSmalle];
+        }
+    }
+    [printer appendQRCodeWithInfo:qrcode size:8 alignment:HLTextAlignmentLeft offset:90];
+    [printer appendBarCodeWithInfo:barcode alignment:HLTextAlignmentLeft maxWidth:300];
+    [printer appendFooter:footerInfo];
+    
+    return printer;
+}
+
+- (NSUInteger)stringEncode:(NSString *)s {
+    NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
+    NSData *data = [s dataUsingEncoding:enc];
+    NSUInteger lengthT = [data length];
+    return lengthT;
+}
+
+- (void)getBarCode:(FlutterResult)result arguments:(NSDictionary *)arguments {
+    NSString *textToBar = arguments[@"textToBar"];
+    NSInteger width = [arguments[@"width"] integerValue];
+    NSInteger height = [arguments[@"height"] integerValue];
+    NSInteger align = [arguments[@"align"] integerValue];
+
+    HLTextAlignment alignment;
+    switch (align) {
+        case 0:
+        {
+            alignment = HLTextAlignmentLeft;
+        } break;
+        case 1:
+        {
+            alignment = HLTextAlignmentCenter;
+        } break;
+        case 2:
+        {
+            alignment = HLTextAlignmentRight;
+        } break;
+            
+        default:
+            alignment = HLTextAlignmentCenter;
+            break;
+    }
+    
+    if (textToBar.length <= 0) { result(nil); return; }
+    HLPrinter *printer = [[HLPrinter alloc] init];
+    [printer getBarCodeWithInfo:textToBar
+                      alignment:alignment
+                         offset:40
+                          width:width
+                         height:height];
+    NSData *mainData = [printer getFinalData];
+    FlutterStandardTypedData *dataByte = [FlutterStandardTypedData typedDataWithBytes:mainData];
+    result(dataByte);
+}
+
+- (NSData *)mapToTscCommand:(NSDictionary *) args {
+    NSDictionary *config = [args objectForKey:@"config"];
+    NSMutableArray *list = [args objectForKey:@"data"];
+    
+    NSNumber *width = ![config objectForKey:@"width"]?@"48" : [config objectForKey:@"width"];
+    NSNumber *height = ![config objectForKey:@"height"]?@"80" : [config objectForKey:@"height"];
+    NSNumber *gap = ![config objectForKey:@"gap"]?@"2" : [config objectForKey:@"gap"];
+    
+    TscCommand *command = [[TscCommand alloc]init];
+    // 设置标签尺寸宽高，按照实际尺寸设置 单位mm
+    [command addSize:[width intValue] :[height intValue]];
+    // 设置标签间隙，按照实际尺寸设置，如果为无间隙纸则设置为0 单位mm
+    [command addGapWithM:[gap intValue] withN:0];
+    // 设置原点坐标
+    [command addReference:0 :0];
+    // 撕纸模式开启
+    [command addTear:@"ON"];
+    // 开启带Response的打印，用于连续打印
+    [command addQueryPrinterStatus:ON];
+    // 清除打印缓冲区
+    [command addCls];
+    
+    for(NSDictionary *m in list){
+        
+        NSString *type = [m objectForKey:@"type"];
+        NSString *content = [m objectForKey:@"content"];
+        NSNumber *x = ![m objectForKey:@"x"]?@0 : [m objectForKey:@"x"];
+        NSNumber *y = ![m objectForKey:@"y"]?@0 : [m objectForKey:@"y"];
+        
+        if([@"text" isEqualToString:type]){
+            [command addTextwithX:[x intValue] withY:[y intValue] withFont:@"TSS24.BF2" withRotation:0 withXscal:1 withYscal:1 withText:content];
+        }else if([@"barcode" isEqualToString:type]){
+            [command add1DBarcode:[x intValue] :[y intValue] :@"CODE128" :100 :1 :0 :2 :2 :content];
+        }else if([@"qrcode" isEqualToString:type]){
+            [command addQRCode:[x intValue] :[y intValue] :@"L" :5 :@"A" :0 :content];
+        }else if([@"image" isEqualToString:type]){
+            NSData *decodeData = [[NSData alloc] initWithBase64EncodedString:content options:0];
+            UIImage *image = [UIImage imageWithData:decodeData];
+            [command addBitmapwithX:[x intValue] withY:[y intValue] withMode:0 withWidth:300 withImage:image];
+        }
+        
+    }
+    
+    [command addPrint:1 :1];
+    
+    return [command getCommand];
+}
+
+#pragma mark -
+#pragma mark - setup 初始化数据
+
+- (void)setupData {
+    self.isConnected = NO;
+    self.timeout = 30;
+}
+
+- (void)startScanPerpheralTimeout:(NSTimeInterval)timeout {
+    // 清空字典
+    [self.scannedPeripherals removeAllObjects];
+    [self.deviceArray removeAllObjects];
+    self.timeout = timeout;
+    
+    // 不重复扫描已发现设备
+    // CBCentralManagerScanOptionAllowDuplicatesKey设置为NO表示不重复扫瞄已发现设备，为YES就是允许。
+    // CBCentralManagerOptionShowPowerAlertKey设置为YES就是在蓝牙未打开的时候显示弹框
+    NSDictionary *option = @{
+        CBCentralManagerScanOptionAllowDuplicatesKey : [NSNumber numberWithBool:NO],
+        CBCentralManagerOptionShowPowerAlertKey:[NSNumber numberWithBool:YES]};
+    
+    __weak BlueThermalPrinterPlugin *weakSelf = self;
+    [self.manager scanForPeripheralsWithServiceUUIDs:nil options:option didDiscoverPeripheral:^(CBCentralManager *central, CBPeripheral *peripheral, NSDictionary *advertisementData, NSNumber *RSSI) {
+        NSLog(@"扫描的外围设备名称 -> name： %@", peripheral.name);
+        if (peripheral.name.length <= 0) { return ; }
+        
+        if (self.deviceArray.count == 0) {
+            NSDictionary *dict = @{
+                @"name":peripheral.name,
+                @"address":peripheral.identifier.UUIDString,
+            };
+            [weakSelf.deviceArray addObject:dict];
+        } else {
+            BOOL isExist = NO;
+            for (int i = 0; i < self.deviceArray.count; i++) {
+                NSDictionary *dict = [weakSelf.deviceArray objectAtIndex:i];
+                NSString *address = dict[@"address"];
+                if ([address isEqualToString:peripheral.identifier.UUIDString]) {
+                    isExist = YES;
+                    NSDictionary *dict = @{
+                        @"name":peripheral.name,
+                        @"address":peripheral.identifier.UUIDString,
+                    };
+                    [weakSelf.deviceArray replaceObjectAtIndex:i withObject:dict];
+                }
+            }
+            if (!isExist) {
+                NSDictionary *dict = @{
+                    @"name":peripheral.name,
+                    @"address":peripheral.identifier.UUIDString,
+                };
+                [weakSelf.deviceArray addObject:dict];
+            }
+        }
+        
+        [weakSelf.scannedPeripherals setObject:peripheral forKey:[[peripheral identifier] UUIDString]];
+        NSLog(@"扫描的蓝牙外设数量 -> %lu", (unsigned long)weakSelf.deviceArray.count);
+    }];
+}
+
+// 开始扫描
+- (void)initBluetoothToScan {
+    __weak BlueThermalPrinterPlugin *weakSelf = self;
+    self.manager.stateUpdateBlock = ^(CBCentralManager *central) {
+        NSString *info = nil;
+        switch (central.state) {
+            case CBCentralManagerStatePoweredOn:{
+                info = @"蓝牙已打开，并且可用";
+                [weakSelf startScanPerpheralTimeout:10];
+                break;
+            }
+            case CBCentralManagerStatePoweredOff:
+                info = @"蓝牙可用，未打开";
+                break;
+            case CBCentralManagerStateUnsupported:
+                info = @"SDK不支持";
+                break;
+            case CBCentralManagerStateUnauthorized:
+                info = @"程序未授权";
+                break;
+            case CBCentralManagerStateResetting:
+                info = @"CBCentralManagerStateResetting";
+                break;
+            case CBCentralManagerStateUnknown:
+                info = @"CBCentralManagerStateUnknown";
+                break;
+        }
+        NSLog(@"扫描中心设备状态 -> state：%@", info);
+    };
+}
+
+// 连接外围设备
+- (void)connectBLEDevice:(CBPeripheral *)perpheral {
+    if (perpheral.name.length <= 0) {
+        return;
+    }
+    
+    //HLBLEManager *manager = [HLBLEManager sharedInstance];
+    __weak BlueThermalPrinterPlugin *weakSelf = self;
+    [self.manager connectPeripheral:perpheral
+                     connectOptions:@{CBConnectPeripheralOptionNotifyOnDisconnectionKey:@(YES)}
+             stopScanAfterConnected:YES
+                    servicesOptions:nil
+             characteristicsOptions:nil
+                      completeBlock:^(HLOptionStage stage, CBPeripheral *peripheral, CBService *service, CBCharacteristic *character, NSError *error) {
+        switch (stage) {
+            case HLOptionStageConnection:
+            {
+                NSLog(@"连接的外设状态 -> state: %ld", (long)peripheral.state);
+                if (error) {
+                    NSLog(@"连接失败");
+                    weakSelf.isConnected = NO;
+                } else { // 状态变化
+                    [weakSelf updateConnectState:peripheral.state];
+                }
+                break;
+            }
+            case HLOptionStageSeekServices:
+            {
+                if (error) {
+                    NSLog(@"查找服务失败");
+                } else {
+                    NSLog(@"查找服务成功");
+                }
+                break;
+            }
+            case HLOptionStageSeekCharacteristics:
+            {
+                // 该block会返回多次，每一个服务返回一次
+                if (error) {
+                    NSLog(@"查找特性失败");
+                } else {
+                    NSLog(@"查找特性成功");
+                }
+                break;
+            }
+            case HLOptionStageSeekdescriptors:
+            {
+                // 该block会返回多次，每一个特性返回一次
+                if (error) {
+                    NSLog(@"查找特性的描述失败");
+                } else {
+                    NSLog(@"查找特性的描述成功");
+                }
+                break;
+            }
+            default:
+                break;
+        }
+    }];
+}
+
+- (void)updateConnectState:(CBPeripheralState)state {
+    __weak BlueThermalPrinterPlugin *weakSelf = self;
+    dispatch_async(dispatch_get_main_queue(), ^{
+        NSNumber *ret = @0;
+        switch (state) {
+            case CBPeripheralStateConnecting:
+            {
+                NSLog(@"update status -> %@", @"连接状态：连接中....");
+                ret = @0;
+                weakSelf.isConnected = NO;
+                break;
+            }
+            case CBPeripheralStateConnected:
+            {
+                NSLog(@"update status -> %@", @"连接状态：连接成功");
+                ret = @1;
+                weakSelf.isConnected = YES;
+                break;
+            }
+            case CBPeripheralStateDisconnecting:
+            {
+                NSLog(@"update status -> %@", @"连接状态：连接失败");
+                ret = @0;
+                weakSelf.isConnected = NO;
+                break;
+            }
+            case CBPeripheralStateDisconnected:
+            {
+                NSLog(@"update status -> %@", @"连接状态：断开连接");
+                ret = @0;
+                weakSelf.isConnected = NO;
+                break;
+            }
+            default:
+                NSLog(@"update status -> %@", @"连接状态：连接超时");
+                ret = @0;
+                weakSelf.isConnected = NO;
+                break;
+        }
+        
+        NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:ret,@"id",nil];
+        if(weakSelf.stateStreamHandler.sink != nil) {
+            weakSelf.stateStreamHandler.sink([dict objectForKey:@"id"]);
+        }
+    });
+}
+
+#pragma mark -
+#pragma mark - 懒加载
+
+- (NSMutableArray *)deviceArray {
+    if (!_deviceArray) {
+        _deviceArray = [[NSMutableArray alloc] init];
+    }
+    return _deviceArray;
+}
+
+- (HLBLEManager *)manager {
+    if (!_manager) {
+        _manager = [HLBLEManager sharedInstance];
+    }
+    return _manager;
+}
+
+- (void)setTimeout:(NSTimeInterval)timeout {
+    _timeout = timeout;
+    if (_timeout > 0) {
+        [self performSelector:@selector(timeoutAction) withObject:nil afterDelay:timeout];
+    }
+}
+
+- (void)timeoutAction {
+    [self.manager stopScan];
+}
+
+@end
+
+
+@implementation BluetoothPrintStreamHandler
+
+- (FlutterError*)onListenWithArguments:(id)arguments eventSink:(FlutterEventSink)eventSink {
+    self.sink = eventSink;
+    return nil;
+}
+
+- (FlutterError*)onCancelWithArguments:(id)arguments {
+    self.sink = nil;
+    return nil;
+}
+
+@end

ios/Classes/HLBluetooth/HLBLEConst.h

+//
+//  HLBLEConst.h
+//  HLBluetoothDemo
+//
+//  Created by Harvey on 16/4/29.
+//  Copyright © 2016年 Halley. All rights reserved.
+//
+
+#ifndef HLBLEConst_h
+#define HLBLEConst_h
+
+typedef NS_ENUM(NSInteger, HLOptionStage) {
+    HLOptionStageConnection,            //蓝牙连接阶段
+    HLOptionStageSeekServices,          //搜索服务阶段
+    HLOptionStageSeekCharacteristics,   //搜索特性阶段
+    HLOptionStageSeekdescriptors,       //搜索描述信息阶段
+};
+
+#pragma mark ------------------- 通知的定义 --------------------------
+/** 蓝牙状态改变的通知 */
+#define kCentralManagerStateUpdateNoticiation @"kCentralManagerStateUpdateNoticiation"
+
+#pragma mark ------------------- block的定义 --------------------------
+/** 蓝牙状态改变的block */
+typedef void(^HLStateUpdateBlock)(CBCentralManager *central);
+
+/** 发现一个蓝牙外设的block */
+typedef void(^HLDiscoverPeripheralBlock)(CBCentralManager *central, CBPeripheral *peripheral, NSDictionary *advertisementData, NSNumber *RSSI);
+
+/** 连接完成的block,失败error就不为nil */
+typedef void(^HLConnectCompletionBlock)(CBPeripheral *peripheral, NSError *error);
+
+/** 搜索到连接上的蓝牙外设的服务block */
+typedef void(^HLDiscoveredServicesBlock)(CBPeripheral *peripheral, NSArray *services, NSError *error);
+
+/** 搜索某个服务的子服务 的回调 */
+typedef void(^HLDiscoveredIncludedServicesBlock)(CBPeripheral *peripheral,CBService *service, NSArray *includedServices, NSError *error);
+
+/** 搜索到某个服务中的特性的block */
+typedef void(^HLDiscoverCharacteristicsBlock)(CBPeripheral *peripheral, CBService *service, NSArray *characteristics, NSError *error);
+
+/** 收到某个特性值更新的回调 */
+typedef void(^HLNotifyCharacteristicBlock)(CBPeripheral *peripheral,CBCharacteristic *characteristic,NSError *error);
+
+/** 查找到某个特性的描述 block */
+typedef void(^HLDiscoverDescriptorsBlock)(CBPeripheral *peripheral,CBCharacteristic *characteristic,NSArray *descriptors, NSError *error);
+
+/** 统一返回使用的block */
+typedef void(^HLBLECompletionBlock)(HLOptionStage stage, CBPeripheral *peripheral,CBService *service, CBCharacteristic *character, NSError *error);
+
+/** 获取特性中的值 */
+typedef void(^HLValueForCharacteristicBlock)(CBCharacteristic *characteristic, NSData *value, NSError *error);
+
+/** 获取描述中的值 */
+typedef void(^HLValueForDescriptorBlock)(CBDescriptor *descriptor,NSData *data,NSError *error);
+
+/** 往特性中写入数据的回调 */
+typedef void(^HLWriteToCharacteristicBlock)(CBCharacteristic *characteristic, NSError *error);
+
+/** 往描述中写入数据的回调 */
+typedef void(^HLWriteToDescriptorBlock)(CBDescriptor *descriptor, NSError *error);
+
+/** 获取蓝牙外设信号的回调 */
+typedef void(^HLGetRSSIBlock)(CBPeripheral *peripheral,NSNumber *RSSI, NSError *error);
+
+#endif /* HLBLEConst_h */

ios/Classes/HLBluetooth/HLBLEManager.h

+//
+//  HLBLEManager.h
+//  HLBluetoothDemo
+//
+//  Created by Harvey on 16/4/27.
+//  Copyright © 2016年 Halley. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import <CoreBluetooth/CoreBluetooth.h>
+#import "HLBLEConst.h"
+#import "SEBLEConst.h"
+
+@interface HLBLEManager : NSObject
+
+#pragma mark - properties
+/** 蓝牙模块状态改变的回调 */
+@property (copy, nonatomic) HLStateUpdateBlock                      stateUpdateBlock;
+/** 发现一个蓝牙外设的回调 */
+@property (copy, nonatomic) HLDiscoverPeripheralBlock               discoverPeripheralBlcok;
+/** 连接外设完成的回调 */
+@property (copy, nonatomic) HLConnectCompletionBlock                connectCompleteBlock;
+/** 发现服务的回调 */
+@property (copy, nonatomic) HLDiscoveredServicesBlock               discoverServicesBlock;
+/** 发现服务中的特性的回调 */
+@property (copy, nonatomic) HLDiscoverCharacteristicsBlock          discoverCharacteristicsBlock;
+/** 特性值改变的回调 */
+@property (copy, nonatomic) HLNotifyCharacteristicBlock             notifyCharacteristicBlock;
+/** 发现服务中的子服务的回调 */
+@property (copy, nonatomic) HLDiscoveredIncludedServicesBlock       discoverdIncludedServicesBlock;
+/** 发现特性的描述的回调 */
+@property (copy, nonatomic) HLDiscoverDescriptorsBlock              discoverDescriptorsBlock;
+/** 操作完成的统一回调 */
+@property (copy, nonatomic) HLBLECompletionBlock                    completionBlock;
+/** 获取特性值回调 */
+@property (copy, nonatomic) HLValueForCharacteristicBlock           valueForCharacteristicBlock;
+/** 获取描述值的回调 */
+@property (copy, nonatomic) HLValueForDescriptorBlock               valueForDescriptorBlock;
+/** 将数据写入特性中的回调 */
+@property (copy, nonatomic) HLWriteToCharacteristicBlock            writeToCharacteristicBlock;
+/** 将数据写入描述中的回调*/
+@property (copy, nonatomic) HLWriteToDescriptorBlock                writeToDescriptorBlock;
+/** 获取蓝牙外设信号强度的回调  */
+@property (copy, nonatomic) HLGetRSSIBlock                          getRSSIBlock;
+
+@property (strong, nonatomic, readonly)   CBPeripheral            *connectedPerpheral;  /**< 当前连接的外设 */
+
+/**
+ * 每次发送的最大数据长度，因为部分型号的蓝牙打印机一次写入数据过长，会导致打印乱码。
+ * iOS 9之后，会调用系统的API来获取特性能写入的最大数据长度。
+ * 但是iOS 9之前需要自己测试然后设置一个合适的值。默认值是146，我使用佳博58MB-III的限度。
+ * 所以，如果你打印乱码，你考虑将该值设置小一点再试试。
+ */
+@property (assign, nonatomic)   NSInteger             limitLength;
+
+#pragma mark - method
++ (instancetype)sharedInstance;
+
+/**
+ *  上次连接的蓝牙外设的UUIDString
+ *
+ *  @return UUIDString,没有时返回nil
+ */
++ (NSString *)UUIDStringForLastPeripheral;
+
+/**
+ *  开始搜索蓝牙外设，每次在block中返回一个蓝牙外设信息
+ *
+ *  @param uuids         服务的CBUUID
+ *  @param option        其他可选参数
+ */
+- (void)scanForPeripheralsWithServiceUUIDs:(NSArray<CBUUID *> *)uuids options:(NSDictionary<NSString *, id> *)options;
+/**
+ *  开始搜索蓝牙外设，每次在block中返回一个蓝牙外设信息
+ *  返回的block参数可参考CBCentralManager 的 centralManager:didDiscoverPeripheral:advertisementData:RSSI:
+ *
+ *  @param uuids         服务的CBUUID
+ *  @param option        其他可选参数
+ *  @param discoverBlock 搜索到蓝牙外设后的回调
+ */
+- (void)scanForPeripheralsWithServiceUUIDs:(NSArray<CBUUID *> *)uuids options:(NSDictionary<NSString *, id> *)options didDiscoverPeripheral:(HLDiscoverPeripheralBlock)discoverBlock;
+
+/**
+ *  连接某个蓝牙外设，并查询服务，特性，特性描述
+ *
+ *  @param peripheral          要连接的蓝牙外设
+ *  @param connectOptions      连接的配置参数
+ *  @param stop                连接成功后是否停止搜索蓝牙外设
+ *  @param serviceUUIDs        要搜索的服务UUID
+ *  @param characteristicUUIDs 要搜索的特性UUID
+ *  @param completionBlock     操作执行完的回调
+ */
+- (void)connectPeripheral:(CBPeripheral *)peripheral
+           connectOptions:(NSDictionary<NSString *,id> *)connectOptions
+   stopScanAfterConnected:(BOOL)stop
+          servicesOptions:(NSArray<CBUUID *> *)serviceUUIDs
+   characteristicsOptions:(NSArray<CBUUID *> *)characteristicUUIDs
+            completeBlock:(HLBLECompletionBlock)completionBlock;
+
+/**
+ *  查找某个服务的子服务
+ *
+ *  @param includedServiceUUIDs 要查找的子服务的UUIDs
+ *  @param service              父服务
+ */
+- (void)discoverIncludedServices:(NSArray<CBUUID *> *)includedServiceUUIDs forService:(CBService *)service;
+
+/**
+ *  读取某个特性的值
+ *
+ *  @param characteristic 要读取的特性
+ */
+- (void)readValueForCharacteristic:(CBCharacteristic *)characteristic;
+
+/**
+ *  读取某个特性的值
+ *
+ *  @param characteristic  要读取的特性
+ *  @param completionBlock 读取完后的回调
+ */
+- (void)readValueForCharacteristic:(CBCharacteristic *)characteristic completionBlock:(HLValueForCharacteristicBlock)completionBlock;
+
+/**
+ *  往某个特性中写入数据
+ *
+ *  @param data           写入的数据
+ *  @param characteristic 特性对象
+ *  @param type           写入类型
+ */
+- (void)writeValue:(NSData *)data forCharacteristic:(CBCharacteristic *)characteristic type:(CBCharacteristicWriteType)type;
+
+
+/**
+ *  往某个特性中写入数据
+ *
+ *  @param data           写入的数据
+ *  @param characteristic 特性对象
+ *  @param type           写入类型
+ *  @param completionBlock 写入完成后的回调,只有type为CBCharacteristicWriteWithResponse时，才会回调
+ */
+- (void)writeValue:(NSData *)data forCharacteristic:(CBCharacteristic *)characteristic type:(CBCharacteristicWriteType)type completionBlock:(HLWriteToCharacteristicBlock)completionBlock;
+
+/**
+ *  读取某特性的描述信息
+ *
+ *  @param descriptor 描述对象
+ */
+- (void)readValueForDescriptor:(CBDescriptor *)descriptor;
+
+/**
+ *  读取某特性的描述信息
+ *
+ *  @param descriptor      描述对象
+ *  @param completionBlock 读取结果返回时的回调
+ */
+- (void)readValueForDescriptor:(CBDescriptor *)descriptor completionBlock:(HLValueForDescriptorBlock)completionBlock;
+
+/**
+ *  将数据写入特性的描述中
+ *
+ *  @param data       数据
+ *  @param descriptor 描述对象
+ */
+- (void)writeValue:(NSData *)data forDescriptor:(CBDescriptor *)descriptor;
+
+/**
+ *  将数据写入特性的描述中
+ *
+ *  @param data       数据
+ *  @param descriptor 描述对象
+ *  @param completionBlock 数据写入完成后的回调
+ */
+- (void)writeValue:(NSData *)data forDescriptor:(CBDescriptor *)descriptor completionBlock:(HLWriteToDescriptorBlock)completionBlock;
+
+/**
+ *  获取某外设的信号
+ *
+ *  @param completionBlock 获取信号完成后的回调
+ */
+- (void)readRSSICompletionBlock:(HLGetRSSIBlock)getRSSIBlock;
+
+/**
+ *  停止扫描
+ */
+- (void)stopScan;
+
+/**
+ *  断开蓝牙连接
+ */
+- (void)cancelPeripheralConnection;
+
+
+#pragma mark - 打印相关的方法
+#pragma mark - print method
+/**
+ *  打印自己组装的数据
+ *
+ *  @param data
+ *  @param result 结果
+ */
+- (void)sendPrintData:(NSData *)data completion:(SEPrintResult)result;
+
+@end

ios/Classes/HLBluetooth/HLBLEManager.m

+//
+//  HLBLEManager.m
+//  HLBluetoothDemo
+//
+//  Created by Harvey on 16/4/27.
+//  Copyright © 2016年 Halley. All rights reserved.
+//
+
+#import "HLBLEManager.h"
+
+#define kSECharacter    @"character"
+#define kSEType         @"type"
+
+// 发送数据时，需要分段的长度，部分打印机一次发送数据过长就会乱码，需要分段发送。这个长度值不同的打印机可能不一样，你需要调试设置一个合适的值（最好是偶数）
+#define kLimitLength    146
+
+@interface HLBLEManager ()<CBCentralManagerDelegate,CBPeripheralDelegate>
+
+@property (strong, nonatomic)   CBCentralManager            *centralManager;        /**< 中心管理器 */
+@property (strong, nonatomic)   CBPeripheral                *connectedPerpheral;    /**< 当前连接的外设 */
+
+@property (strong, nonatomic)   NSArray<CBUUID *>           *serviceUUIDs;          /**< 要查找服务的UUIDs */
+@property (strong, nonatomic)   NSArray<CBUUID *>           *characteristicUUIDs;   /**< 要查找特性的UUIDs */
+
+@property (assign, nonatomic)   BOOL             stopScanAfterConnected;  /**< 是否连接成功后停止扫描蓝牙设备 */
+
+@property (assign, nonatomic)   NSInteger         writeCount;   /**< 写入次数 */
+@property (assign, nonatomic)   NSInteger         responseCount; /**< 返回次数 */
+@property (strong, nonatomic)   NSMutableArray              *writeChatacters;  /**< 可写入数据的特性 */
+@property (strong, nonatomic)   SEPrintResult                   printResult;  /**< 打印结果的回调 */
+
+@end
+
+static HLBLEManager *instance = nil;
+
+@implementation HLBLEManager
+
++ (instancetype)sharedInstance
+{
+    return [[self alloc] init];
+}
+
++ (NSString *)UUIDStringForLastPeripheral
+{
+    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
+    NSString *UUIDString = [userDefaults objectForKey:@"peripheral"];
+    return UUIDString;
+}
+
+- (instancetype)init {
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        instance = [super init];
+        //蓝牙没打开时alert提示框
+        NSDictionary *options = @{CBCentralManagerOptionShowPowerAlertKey:@(YES)};
+        _centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:dispatch_get_main_queue() options:options];
+        _limitLength = kLimitLength;
+        instance.writeChatacters = [[NSMutableArray alloc] init];
+    });
+    
+    return instance;
+}
+
++ (instancetype)allocWithZone:(struct _NSZone *)zone
+{
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        instance = [super allocWithZone:zone];
+    });
+    
+    return instance;
+}
+
+- (void)scanForPeripheralsWithServiceUUIDs:(NSArray<CBUUID *> *)uuids options:(NSDictionary<NSString *, id> *)options
+{
+    [_centralManager scanForPeripheralsWithServices:uuids options:options];
+}
+
+- (void)scanForPeripheralsWithServiceUUIDs:(NSArray<CBUUID *> *)uuids options:(NSDictionary<NSString *, id> *)options didDiscoverPeripheral:(HLDiscoverPeripheralBlock)discoverBlock
+{
+    _discoverPeripheralBlcok = discoverBlock;
+    [_centralManager scanForPeripheralsWithServices:uuids options:options];
+}
+
+- (void)connectPeripheral:(CBPeripheral *)peripheral
+           connectOptions:(NSDictionary<NSString *,id> *)connectOptions
+   stopScanAfterConnected:(BOOL)stop
+          servicesOptions:(NSArray<CBUUID *> *)serviceUUIDs
+   characteristicsOptions:(NSArray<CBUUID *> *)characteristicUUIDs
+            completeBlock:(HLBLECompletionBlock)completionBlock;
+{
+    //1.保存回调的block以及参数
+    _completionBlock = completionBlock;
+    _serviceUUIDs = serviceUUIDs;
+    _characteristicUUIDs = characteristicUUIDs;
+    _stopScanAfterConnected = stop;
+    
+    //2.先取消之前连接的蓝牙外设
+    if (_connectedPerpheral) {
+        [_centralManager cancelPeripheralConnection:_connectedPerpheral];
+    }
+    
+    //3.开始连接新的蓝牙外设
+    [_centralManager connectPeripheral:peripheral options:connectOptions];
+    //4.设置代理
+    peripheral.delegate = self;
+}
+
+- (void)discoverIncludedServices:(NSArray<CBUUID *> *)includedServiceUUIDs forService:(CBService *)service
+{
+    [_connectedPerpheral discoverIncludedServices:includedServiceUUIDs forService:service];
+}
+
+- (void)stopScan
+{
+    [_centralManager stopScan];
+    _discoverPeripheralBlcok = nil;
+}
+
+- (void)cancelPeripheralConnection
+{
+    if (_connectedPerpheral) {
+        [_centralManager cancelPeripheralConnection:_connectedPerpheral];
+        
+        [_writeChatacters removeAllObjects];
+        NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
+        [userDefaults removeObjectForKey:@"peripheral"];
+        [userDefaults synchronize];
+    }
+}
+
+- (void)readValueForCharacteristic:(CBCharacteristic *)characteristic
+{
+    [_connectedPerpheral readValueForCharacteristic:characteristic];
+}
+
+- (void)readValueForCharacteristic:(CBCharacteristic *)characteristic completionBlock:(HLValueForCharacteristicBlock)completionBlock
+{
+    _valueForCharacteristicBlock = completionBlock;
+    [self readValueForCharacteristic:characteristic];
+}
+
+- (void)writeValue:(NSData *)data forCharacteristic:(CBCharacteristic *)characteristic type:(CBCharacteristicWriteType)type
+{
+    _writeCount = 0;
+    _responseCount = 0;
+    // iOS 9 以后，系统添加了这个API来获取特性能写入的最大长度
+    if ([_connectedPerpheral respondsToSelector:@selector(maximumWriteValueLengthForType:)]) {
+        _limitLength = [_connectedPerpheral maximumWriteValueLengthForType:type];
+    }
+    
+    // 如果_limitLength 小于等于0，则表示不用分段发送
+    if (_limitLength <= 0) {
+        [_connectedPerpheral writeValue:data forCharacteristic:characteristic type:type];
+        _writeCount ++;
+        return;
+    }
+    
+    if (data.length <= _limitLength) {
+        [_connectedPerpheral writeValue:data forCharacteristic:characteristic type:type];
+        _writeCount ++;
+    } else {
+        NSInteger index = 0;
+        for (index = 0; index < data.length - _limitLength; index += _limitLength) {
+            NSData *subData = [data subdataWithRange:NSMakeRange(index, _limitLength)];
+            [_connectedPerpheral writeValue:subData forCharacteristic:characteristic type:type];
+            _writeCount++;
+        }
+        NSData *leftData = [data subdataWithRange:NSMakeRange(index, data.length - index)];
+        if (leftData) {
+            [_connectedPerpheral writeValue:leftData forCharacteristic:characteristic type:type];
+            _writeCount++;
+        }
+    }
+}
+
+- (void)writeValue:(NSData *)data forCharacteristic:(CBCharacteristic *)characteristic type:(CBCharacteristicWriteType)type completionBlock:(HLWriteToCharacteristicBlock)completionBlock
+{
+    _writeToCharacteristicBlock = completionBlock;
+    [self writeValue:data forCharacteristic:characteristic type:type];
+}
+
+- (void)readValueForDescriptor:(CBDescriptor *)descriptor
+{
+    [_connectedPerpheral readValueForDescriptor:descriptor];
+}
+
+- (void)readValueForDescriptor:(CBDescriptor *)descriptor completionBlock:(HLValueForDescriptorBlock)completionBlock
+{
+    _valueForDescriptorBlock = completionBlock;
+    [self readValueForDescriptor:descriptor];
+}
+
+- (void)writeValue:(NSData *)data forDescriptor:(CBDescriptor *)descriptor
+{
+    [_connectedPerpheral writeValue:data forDescriptor:descriptor];
+}
+
+- (void)writeValue:(NSData *)data forDescriptor:(CBDescriptor *)descriptor completionBlock:(HLWriteToDescriptorBlock)completionBlock
+{
+    _writeToDescriptorBlock = completionBlock;
+    [self writeValue:data forDescriptor:descriptor];
+}
+
+- (void)readRSSICompletionBlock:(HLGetRSSIBlock)getRSSIBlock
+{
+    _getRSSIBlock = getRSSIBlock;
+    [_connectedPerpheral readRSSI];
+}
+
+
+#pragma mark - CBCentralManagerDelegate
+- (void)centralManagerDidUpdateState:(CBCentralManager *)central
+{
+    [[NSNotificationCenter defaultCenter] postNotificationName:kCentralManagerStateUpdateNoticiation object:@{@"central":central}];
+    
+    if (_stateUpdateBlock) {
+        _stateUpdateBlock(central);
+    }
+}
+
+- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *, id> *)advertisementData RSSI:(NSNumber *)RSSI
+{
+    if (_discoverPeripheralBlcok) {
+        _discoverPeripheralBlcok(central, peripheral, advertisementData, RSSI);
+    }
+}
+
+#pragma mark ---------------- 连接外设成功和失败的代理 ---------------
+- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
+{
+    _connectedPerpheral = peripheral;
+    
+    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
+    [userDefaults setObject:peripheral.identifier.UUIDString forKey:@"peripheral"];
+    [userDefaults synchronize];
+    
+    if (_stopScanAfterConnected) {
+        [_centralManager stopScan];
+    }
+    
+    if (_discoverServicesBlock) {
+        _discoverServicesBlock(peripheral, peripheral.services,nil);
+    }
+    
+    if (_completionBlock) {
+        _completionBlock(HLOptionStageConnection,peripheral,nil,nil,nil);
+    }
+    
+    [peripheral discoverServices:_serviceUUIDs];
+}
+
+- (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(nullable NSError *)error
+{
+    if (_discoverServicesBlock) {
+        _discoverServicesBlock(peripheral, peripheral.services,error);
+    }
+    
+    if (_completionBlock) {
+        _completionBlock(HLOptionStageConnection,peripheral,nil,nil,error);
+    }
+}
+
+- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(nullable NSError *)error
+{
+    _connectedPerpheral = nil;
+    [_writeChatacters removeAllObjects];
+    
+    NSLog(@"断开连接了，断开连接了 %@",error);
+    if (_completionBlock) {
+        _completionBlock(HLOptionStageConnection,peripheral,nil,nil,error);
+    }
+}
+
+#pragma mark ---------------- 发现服务的代理 -----------------
+- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(nullable NSError *)error
+{
+    if (error) {
+        if (_completionBlock) {
+            _completionBlock(HLOptionStageSeekServices,peripheral,nil,nil,error);
+        }
+        return;
+    }
+    
+    if (_completionBlock) {
+        _completionBlock(HLOptionStageSeekServices,peripheral,nil,nil,nil);
+    }
+    
+    for (CBService *service in peripheral.services) {
+        [peripheral discoverCharacteristics:_characteristicUUIDs forService:service];
+    }
+}
+
+- (void)peripheral:(CBPeripheral *)peripheral didDiscoverIncludedServicesForService:(CBService *)service error:(nullable NSError *)error
+{
+    if (error) {
+        if (_discoverdIncludedServicesBlock) {
+            _discoverdIncludedServicesBlock(peripheral,service,nil,error);
+        }
+        return;
+    }
+    
+    if (_discoverdIncludedServicesBlock) {
+        _discoverdIncludedServicesBlock(peripheral,service,service.includedServices,error);
+    }
+}
+
+#pragma mark ---------------- 服务特性的代理 --------------------
+- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(nullable NSError *)error
+{
+    if (error) {
+        if (_completionBlock) {
+            _completionBlock(HLOptionStageSeekCharacteristics,peripheral,service,nil,error);
+        }
+        return;
+    }
+    
+    if (_discoverCharacteristicsBlock) {
+        _discoverCharacteristicsBlock(peripheral,service,service.characteristics,nil);
+    }
+    
+    if (_completionBlock) {
+        _completionBlock(HLOptionStageSeekCharacteristics,peripheral,service,nil,nil);
+    }
+    
+    for (CBCharacteristic *character in service.characteristics) {
+        [peripheral discoverDescriptorsForCharacteristic:character];
+        [peripheral readValueForCharacteristic:character];
+        
+        CBCharacteristicProperties properties = character.properties;
+        if (properties & CBCharacteristicPropertyWrite) {
+            NSDictionary *dict = @{kSECharacter:character,kSEType:@(CBCharacteristicWriteWithResponse)};
+            [_writeChatacters addObject:dict];
+        }
+    }
+    
+}
+
+- (void)peripheral:(CBPeripheral *)peripheral didUpdateNotificationStateForCharacteristic:(CBCharacteristic *)characteristic error:(nullable NSError *)error
+{
+    if (error) {
+        if (_notifyCharacteristicBlock) {
+            _notifyCharacteristicBlock(peripheral,characteristic,error);
+        }
+        return;
+    }
+    if (_notifyCharacteristicBlock) {
+        _notifyCharacteristicBlock(peripheral,characteristic,nil);
+    }
+}
+
+// 读取特性中的值
+- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
+{
+    if (error) {
+        if (_valueForCharacteristicBlock) {
+            _valueForCharacteristicBlock(characteristic,nil,error);
+        }
+        return;
+    }
+    
+    //
+    NSData *data = characteristic.value;
+    //    if (data.length > 0) {
+    //        const unsigned char *hexBytesLight = [data bytes];
+    //
+    //        NSString * battery = [NSString stringWithFormat:@"%02x", hexBytesLight[0]];
+    //
+    //        NSLog(@"batteryInfo:%@",battery);
+    //    }
+    
+    if (_valueForCharacteristicBlock) {
+        _valueForCharacteristicBlock(characteristic,data,nil);
+    }
+}
+
+#pragma mark ---------------- 发现服务特性描述的代理 ------------------
+- (void)peripheral:(CBPeripheral *)peripheral didDiscoverDescriptorsForCharacteristic:(CBCharacteristic *)characteristic error:(nullable NSError *)error
+{
+    if (error) {
+        if (_completionBlock) {
+            _completionBlock(HLOptionStageSeekdescriptors,peripheral,nil,characteristic,error);
+        }
+        return;
+    }
+    
+    if (_completionBlock) {
+        _completionBlock(HLOptionStageSeekdescriptors,peripheral,nil,characteristic,nil);
+    }
+}
+
+- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForDescriptor:(CBDescriptor *)descriptor error:(nullable NSError *)error
+{
+    if (error) {
+        if (_valueForDescriptorBlock) {
+            _valueForDescriptorBlock(descriptor,nil,error);
+        }
+        return;
+    }
+    
+    NSData *data = descriptor.value;
+    if (_valueForDescriptorBlock) {
+        _valueForDescriptorBlock(descriptor,data,nil);
+    }
+}
+
+- (void)peripheral:(CBPeripheral *)peripheral didWriteValueForDescriptor:(CBDescriptor *)descriptor error:(nullable NSError *)error
+{
+    if (error) {
+        if (_writeToDescriptorBlock) {
+            _writeToDescriptorBlock(descriptor, error);
+        }
+        return;
+    }
+    
+    if (_writeToDescriptorBlock) {
+        _writeToDescriptorBlock(descriptor, nil);
+    }
+}
+
+#pragma mark ---------------- 写入数据的回调 --------------------
+- (void)peripheral:(CBPeripheral *)peripheral didWriteValueForCharacteristic:(CBCharacteristic *)characteristic error:(nullable NSError *)error
+{
+    if (!_writeToCharacteristicBlock) {
+        return;
+    }
+    
+    if (!_printResult) {
+        return;
+    }
+    
+    _responseCount ++;
+    if (_writeCount != _responseCount) {
+        return;
+    }
+    
+    _writeToCharacteristicBlock(characteristic,error);
+    
+    if (error) {
+        _printResult(_connectedPerpheral,NO,@"发送失败");
+    } else {
+        _printResult(_connectedPerpheral,YES,@"已成功发送至蓝牙设备");
+    }
+}
+
+#pragma mark ---------------- 获取信号之后的回调 ------------------
+
+# if  __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_8_0
+- (void)peripheralDidUpdateRSSI:(CBPeripheral *)peripheral error:(nullable NSError *)error {
+    if (_getRSSIBlock) {
+        _getRSSIBlock(peripheral,peripheral.RSSI,error);
+    }
+}
+#else
+- (void)peripheral:(CBPeripheral *)peripheral didReadRSSI:(NSNumber *)RSSI error:(NSError *)error {
+    if (_getRSSIBlock) {
+        _getRSSIBlock(peripheral,RSSI,error);
+    }
+}
+#endif
+
+
+#pragma mark - 打印相关的方法
+#pragma mark - print method
+
+- (void)sendPrintData:(NSData *)data completion:(SEPrintResult)result {
+    if (!self.connectedPerpheral) {
+        if (result) {
+            result(_connectedPerpheral,NO,@"未连接蓝牙设备");
+        }
+        return;
+    }
+    
+    if (self.writeChatacters.count == 0) {
+        if (result) {
+            result(_connectedPerpheral,NO,@"该蓝牙设备不能写入数据");
+        }
+        return;
+    }
+    
+    NSDictionary *dict = [_writeChatacters lastObject];
+    
+    _writeCount = 0;
+    _responseCount = 0;
+    // 如果kLimitLength 小于等于0，则表示不用分段发送
+    if (kLimitLength <= 0) {
+        _printResult = result;
+        [_connectedPerpheral writeValue:data forCharacteristic:dict[kSECharacter] type:[dict[kSEType] integerValue]];
+        _writeCount ++;
+        return;
+    }
+    
+    if (data.length <= kLimitLength) {
+        _printResult = result;
+        [_connectedPerpheral writeValue:data forCharacteristic:dict[kSECharacter] type:[dict[kSEType] integerValue]];
+        _writeCount ++;
+    } else {
+        NSInteger index = 0;
+        for (index = 0; index < data.length - kLimitLength; index += kLimitLength) {
+            NSData *subData = [data subdataWithRange:NSMakeRange(index, kLimitLength)];
+            [_connectedPerpheral writeValue:subData forCharacteristic:dict[kSECharacter] type:[dict[kSEType] integerValue]];
+            _writeCount++;
+        }
+        _printResult = result;
+        NSData *leftData = [data subdataWithRange:NSMakeRange(index, data.length - index)];
+        if (leftData) {
+            [_connectedPerpheral writeValue:leftData forCharacteristic:dict[kSECharacter] type:[dict[kSEType] integerValue]];
+            _writeCount++;
+        }
+    }
+}
+
+@end

ios/Classes/HLPrinter/HLPrinter.h

+//
+//  HLPrinter.h
+//  HLBluetoothDemo
+//
+//  Created by Harvey on 16/5/3.
+//  Copyright © 2016年 Halley. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import <UIKit/UIKit.h>
+
+#import "UIImage+Bitmap.h"
+
+typedef NS_ENUM(NSInteger, HLPrinterStyle) {
+    HLPrinterStyleDefault,
+    HLPrinterStyleCustom
+};
+
+/** 文字对齐方式 */
+typedef NS_ENUM(NSInteger, HLTextAlignment) {
+    HLTextAlignmentLeft = 0x00,
+    HLTextAlignmentCenter = 0x01,
+    HLTextAlignmentRight = 0x02
+};
+
+/** 字号 */
+typedef NS_ENUM(NSInteger, HLFontSize) {
+    HLFontSizeTitleSmalle = 0x00,               // 1、16个汉字（32个字符） 2、25 offset 一个汉字2个字符
+    HLFontSizeTitleMiddle = 0x11,               // 1、8个汉字（16个字符）  2、50 offset 一个汉字2个字符
+    HLFontSizeTitleBig = 0x22
+};
+
+@interface HLPrinter : NSObject
+
+/**
+ *  添加单行标题,默认字号是小号字体
+ *
+ *  @param title     标题名称
+ *  @param alignment 标题对齐方式
+ */
+- (void)appendText:(NSString *)text alignment:(HLTextAlignment)alignment;
+
+/**
+ *  添加单行标题
+ *
+ *  @param title     标题名称
+ *  @param alignment 标题对齐方式
+ *  @param fontSize  标题字号
+ */
+- (void)appendText:(NSString *)text alignment:(HLTextAlignment)alignment fontSize:(HLFontSize)fontSize;
+
+/**
+ *  添加单行信息，左边名称(左对齐)，右边实际值（右对齐）,默认字号是小号。
+ *  @param title    名称
+ *  @param value    实际值
+ *  警告:因字号和字体与iOS中字体不一致，计算出来有误差，可以用[-appendTitle:value:valueOffset:]或[-appendTitle:value:valueOffset:fontSize:]
+ */
+- (void)appendTitle:(NSString *)title value:(NSString *)value;
+
+/**
+ *  添加单行信息，左边名称(左对齐)，右边实际值（右对齐）。
+ *  @param title    名称
+ *  @param value    实际值
+ *  @param fontSize 字号大小
+ *  警告:因字号和字体与iOS中字体不一致，计算出来有误差,所以建议用在价格方面
+ */
+- (void)appendTitle:(NSString *)title value:(NSString *)value fontSize:(HLFontSize)fontSize;
+
+/**
+ *  设置单行信息，左标题，右实际值
+ *  @提醒 该方法的预览效果与实际效果误差较大，请以实际打印小票为准
+ *
+ *  @param title    标题
+ *  @param value    实际值
+ *  @param offset   实际值偏移量
+ */
+- (void)appendTitle:(NSString *)title value:(NSString *)value valueOffset:(NSInteger)offset;
+
+/**
+ *  设置单行信息，左标题，右实际值
+ *  @提醒 该方法的预览效果与实际效果误差较大，请以实际打印小票为准
+ *
+ *  @param title    标题
+ *  @param value    实际值
+ *  @param offset   实际值偏移量
+ *  @param fontSize 字号
+ */
+- (void)appendTitle:(NSString *)title value:(NSString *)value valueOffset:(NSInteger)offset fontSize:(HLFontSize)fontSize;
+
+/**
+ *  添加选购商品信息标题,一般是三列，名称、数量、单价
+ *
+ *  @param LeftText   左标题
+ *  @param middleText 中间标题
+ *  @param rightText  右标题
+ */
+- (void)appendLeftText:(NSString *)left middleText:(NSString *)middle rightText:(NSString *)right isTitle:(BOOL)isTitle;
+
+/**
+ *  添加图片，一般是添加二维码或者条形码
+ *  ⚠️提醒：这种打印图片的方式，是自己生成图片，然后用位图打印
+ *
+ *  @param image     图片
+ *  @param alignment 图片对齐方式
+ *  @param maxWidth  图片的最大宽度，如果图片过大，会等比缩放
+ */
+- (void)appendImage:(UIImage *)image alignment:(HLTextAlignment)alignment maxWidth:(CGFloat)maxWidth;
+
+
+/**
+ *  添加条形码图片
+ *  ⚠️提醒：这种打印条形码的方式，是自己生成条形码图片，然后用位图打印图片
+ *
+ *  @param info 条形码中包含的信息，默认居中显示，最大宽度为300。如果大于300,会等比缩放。
+ *  @param alignment 图片对齐方式
+ *  @param offset 设置偏移量
+ */
+- (void)getBarCodeWithInfo:(NSString *)info alignment:(HLTextAlignment)alignment offset:(NSInteger)offset width:(NSInteger)width height:(NSInteger)height;
+
+/**
+ *  添加条形码图片
+ *  ⚠️提醒：这种打印条形码的方式，是自己生成条形码图片，然后用位图打印图片
+ *
+ *  @param info 条形码中包含的信息，默认居中显示，最大宽度为300。如果大于300,会等比缩放。
+ */
+- (void)appendBarCodeWithInfo:(NSString *)info;
+
+/**
+ *  添加条形码图片
+ *  ⚠️提醒：这种打印条形码的方式，是自己生成条形码图片，然后用位图打印图片
+ *
+ *  @param info      条形码中的信息
+ *  @param alignment 图片对齐方式
+ *  @param maxWidth  图片最大宽度
+ */
+- (void)appendBarCodeWithInfo:(NSString *)info alignment:(HLTextAlignment)alignment maxWidth:(CGFloat)maxWidth;
+
+/**
+ *  添加二维码
+ *  ✅推荐：这种方式使用的是打印机的指令生成二维码并打印机，所以比较推荐这种方式
+ *
+ *  @param info 二维码中的信息
+ *  @param size 二维码的大小 取值范围1 <= size <= 16
+ */
+- (void)appendQRCodeWithInfo:(NSString *)info size:(NSInteger)size;
+
+/**
+ *  添加二维码
+ *  ✅推荐：这种方式使用的是打印机的指令生成二维码并打印机，所以比较推荐这种方式
+ *
+ *  @param info      二维码中的信息
+ *  @param size      二维码大小，取值范围 1 <= size <= 16
+ *  @param alignment 设置图片对齐方式
+ */
+- (void)appendQRCodeWithInfo:(NSString *)info size:(NSInteger)size alignment:(HLTextAlignment)alignment;
+
+/**
+ *  添加二维码
+ *  ✅推荐：这种方式使用的是打印机的指令生成二维码并打印机，所以比较推荐这种方式
+ *
+ *  @param info      二维码中的信息
+ *  @param size      二维码大小，取值范围 1 <= size <= 16
+ *  @param alignment 设置图片对齐方式
+ *  @param offset 设置偏移量
+ */
+- (void)appendQRCodeWithInfo:(NSString *)info size:(NSInteger)size alignment:(HLTextAlignment)alignment offset:(NSInteger)offset;
+
+/**
+ *  添加二维码图片
+ *  ⚠️提醒：这种打印条二维码的方式，是自己生成二维码图片，然后用位图打印图片
+ *
+ *  @param info 二维码中的信息
+ */
+- (void)appendQRCodeWithInfo:(NSString *)info;
+
+/**
+ *  添加二维码图片
+ *  ⚠️提醒：这种打印条二维码的方式，是自己生成二维码图片，然后用位图打印图片
+ *
+ *  @param info        二维码中的信息
+ *  @param centerImage 二维码中间的图片
+ *  @param alignment   对齐方式
+ *  @param maxWidth    二维码的最大宽度
+ */
+- (void)appendQRCodeWithInfo:(NSString *)info centerImage:(UIImage *)centerImage alignment:(HLTextAlignment)alignment maxWidth:(CGFloat )maxWidth;
+
+/**
+ *  添加一条分割线，like this:---------------------------
+ */
+- (void)appendSeperatorLine;
+
+/**
+ *  添加底部信息
+ *
+ *  @param footerInfo 不填默认为 谢谢惠顾，欢迎下次光临！
+ */
+- (void)appendFooter:(NSString *)footerInfo;
+
+/**
+ 添加自定义的data
+
+ @param data 自定义的data
+ */
+- (void)appendCustomData:(NSData *)data;
+
+/**
+ *  获取最终的data
+ *
+ *  @return 最终的data
+ */
+- (NSData *)getFinalData;
+
+@end

ios/Classes/HLPrinter/HLPrinter.m

+//
+//  HLPrinter.m
+//  HLBluetoothDemo
+//
+//  Created by Harvey on 16/5/3.
+//  Copyright © 2016年 Halley. All rights reserved.
+//
+
+#import "HLPrinter.h"
+
+#define kHLMargin 20
+#define kHLPadding 2
+#define kHLPreviewWidth 320
+
+@interface HLPrinter ()
+
+/** 将要打印的排版后的数据 */
+@property (strong, nonatomic)   NSMutableData            *printerData;
+
+@end
+
+@implementation HLPrinter
+
+- (instancetype)init
+{
+    self = [super init];
+    if (self) {
+        [self defaultSetting];
+    }
+    return self;
+}
+
+- (void)defaultSetting
+{
+    _printerData = [[NSMutableData alloc] init];
+    
+    // 1.初始化打印机
+    Byte initBytes[] = {0x1B,0x40};
+    [_printerData appendBytes:initBytes length:sizeof(initBytes)];
+    // 2.设置行间距为1/6英寸，约34个点
+    // 另一种设置行间距的方法看这个 @link{-setLineSpace:}
+    Byte lineSpace[] = {0x1B,0x32};
+    [_printerData appendBytes:lineSpace length:sizeof(lineSpace)];
+    // 3.设置字体:标准0x00，压缩0x01;
+    Byte fontBytes[] = {0x1B,0x4D,0x00};
+    [_printerData appendBytes:fontBytes length:sizeof(fontBytes)];
+    
+}
+
+#pragma mark - -------------基本操作----------------
+/**
+ *  换行
+ */
+- (void)appendNewLine
+{
+    Byte nextRowBytes[] = {0x0A};
+    [_printerData appendBytes:nextRowBytes length:sizeof(nextRowBytes)];
+}
+
+/**
+ *  回车
+ */
+- (void)appendReturn
+{
+    Byte returnBytes[] = {0x0D};
+    [_printerData appendBytes:returnBytes length:sizeof(returnBytes)];
+}
+
+/**
+ *  设置对齐方式
+ *
+ *  @param alignment 对齐方式：居左、居中、居右
+ */
+- (void)setAlignment:(HLTextAlignment)alignment
+{
+    Byte alignBytes[] = {0x1B,0x61,alignment};
+    [_printerData appendBytes:alignBytes length:sizeof(alignBytes)];
+}
+
+/**
+ *  设置字体大小
+ *
+ *  @param fontSize 字号
+ */
+- (void)setFontSize:(HLFontSize)fontSize
+{
+    Byte fontSizeBytes[] = {0x1D,0x21,fontSize};
+    [_printerData appendBytes:fontSizeBytes length:sizeof(fontSizeBytes)];
+}
+
+/**
+ *  添加文字，不换行
+ *
+ *  @param text 文字内容
+ */
+- (void)setText:(NSString *)text
+{
+    NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
+    NSData *data = [text dataUsingEncoding:enc];
+    [_printerData appendData:data];
+}
+
+/**
+ *  添加文字，不换行
+ *
+ *  @param text    文字内容
+ *  @param maxChar 最多可以允许多少个字节,后面加...
+ */
+- (void)setText:(NSString *)text maxChar:(int)maxChar
+{
+    NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
+    NSData *data = [text dataUsingEncoding:enc];
+    if (data.length > maxChar) {
+        data = [data subdataWithRange:NSMakeRange(0, maxChar)];
+        text = [[NSString alloc] initWithData:data encoding:enc];
+        if (!text) {
+            data = [data subdataWithRange:NSMakeRange(0, maxChar - 1)];
+            text = [[NSString alloc] initWithData:data encoding:enc];
+        }
+        text = [text stringByAppendingString:@"..."];
+    }
+    [self setText:text];
+}
+
+/**
+ *  设置偏移文字
+ *
+ *  @param text 文字
+ */
+- (void)setOffsetText:(NSString *)text
+{
+    // 1.计算偏移量,因字体和字号不同，所以计算出来的宽度与实际宽度有误差(小字体与22字体计算值接近)
+    NSDictionary *dict = @{NSFontAttributeName:[UIFont systemFontOfSize:22.0]};
+    NSAttributedString *valueAttr = [[NSAttributedString alloc] initWithString:text attributes:dict];
+    int valueWidth = valueAttr.size.width;
+    
+    // 2.设置偏移量
+    [self setOffset:368 - valueWidth];
+    
+    // 3.设置文字
+    [self setText:text];
+}
+
+/**
+ *  设置偏移量
+ *
+ *  @param offset 偏移量
+ */
+- (void)setOffset:(NSInteger)offset
+{
+    NSInteger remainder = offset % 256;
+    NSInteger consult = offset / 256;
+    Byte spaceBytes2[] = {0x1B, 0x24, remainder, consult};
+    [_printerData appendBytes:spaceBytes2 length:sizeof(spaceBytes2)];
+}
+
+/**
+ *  设置左边距
+ *
+ *  @param offset 偏移量
+ */
+- (void)setLeftMargin:(NSInteger)left {
+    NSInteger nL = left % 256;
+    NSInteger nH = left / 256;
+    Byte spaceBytes2[] = {0x1D,0x4C,nL,nH};
+    [_printerData appendBytes:spaceBytes2 length:sizeof(spaceBytes2)];
+}
+
+/**
+ *  设置行间距
+ *
+ *  @param points 多少个点
+ */
+- (void)setLineSpace:(NSInteger)points
+{
+    //最后一位，可选 0~255
+    Byte lineSpace[] = {0x1B,0x33,points};
+    [_printerData appendBytes:lineSpace length:sizeof(lineSpace)];
+}
+
+/**
+ *  设置二维码模块大小
+ *
+ *  @param size  1<= size <= 16,二维码的宽高相等
+ */
+- (void)setQRCodeSize:(NSInteger)size
+{
+    Byte QRSize [] = {0x1D,0x28,0x6B,0x03,0x00,0x31,0x43,size};
+//    Byte QRSize [] = {29,40,107,3,0,49,67,size};
+    [_printerData appendBytes:QRSize length:sizeof(QRSize)];
+}
+
+/**
+ *  设置二维码的纠错等级
+ *
+ *  @param level 48 <= level <= 51
+ */
+- (void)setQRCodeErrorCorrection:(NSInteger)level
+{
+    Byte levelBytes [] = {0x1D,0x28,0x6B,0x03,0x00,0x31,0x45,level};
+//    Byte levelBytes [] = {29,40,107,3,0,49,69,level};
+    [_printerData appendBytes:levelBytes length:sizeof(levelBytes)];
+}
+
+/**
+ *  将二维码数据存储到符号存储区
+ * [范围]:  4≤(pL+pH×256)≤7092 (0≤pL≤255,0≤pH≤27) 
+ * cn=49  
+ * fn=80  
+ * m=48
+ * k=(pL+pH×256)-3, k就是数据的长度
+ *
+ *  @param info 二维码数据
+ */
+- (void)setQRCodeInfo:(NSString *)info
+{
+    NSInteger kLength = info.length + 3;
+    NSInteger pL = kLength % 256;
+    NSInteger pH = kLength / 256;
+    
+    Byte dataBytes [] = {0x1D,0x28,0x6B,pL,pH,0x31,0x50,48};
+//    Byte dataBytes [] = {29,40,107,pL,pH,49,80,48};
+    [_printerData appendBytes:dataBytes length:sizeof(dataBytes)];
+    NSData *infoData = [info dataUsingEncoding:NSUTF8StringEncoding];
+    [_printerData appendData:infoData];
+//    [self setText:info];
+}
+
+/**
+ *  打印之前存储的二维码信息
+ */
+- (void)printStoredQRData
+{
+    Byte printBytes [] = {0x1D,0x28,0x6B,0x03,0x00,0x31,0x51,48};
+//    Byte printBytes [] = {29,40,107,3,0,49,81,48};
+    [_printerData appendBytes:printBytes length:sizeof(printBytes)];
+}
+
+#pragma mark - ------------function method ----------------
+#pragma mark  文字
+- (void)appendText:(NSString *)text alignment:(HLTextAlignment)alignment
+{
+    [self appendText:text alignment:alignment fontSize:HLFontSizeTitleSmalle];
+}
+
+- (void)appendText:(NSString *)text alignment:(HLTextAlignment)alignment fontSize:(HLFontSize)fontSize
+{
+    // 1.文字对齐方式
+    [self setAlignment:alignment];
+    // 2.设置字号
+    [self setFontSize:fontSize];
+    // 3.设置标题内容
+    [self setText:text];
+    // 4.换行
+    [self appendNewLine];
+    if (fontSize != HLFontSizeTitleSmalle) {
+        [self appendNewLine];
+    }
+}
+
+- (void)appendTitle:(NSString *)title value:(NSString *)value
+{
+    [self appendTitle:title value:value fontSize:HLFontSizeTitleSmalle];
+}
+
+- (void)appendTitle:(NSString *)title value:(NSString *)value fontSize:(HLFontSize)fontSize
+{
+    // 1.设置对齐方式
+    [self setAlignment:HLTextAlignmentLeft];
+    // 2.设置字号
+    [self setFontSize:fontSize];
+    // 3.设置标题内容
+    [self setText:title];
+    // 4.设置实际值
+    [self setOffsetText:value];
+    // 5.换行
+    [self appendNewLine];
+    if (fontSize != HLFontSizeTitleSmalle) {
+        [self appendNewLine];
+    }
+
+}
+
+- (void)appendTitle:(NSString *)title value:(NSString *)value valueOffset:(NSInteger)offset
+{
+    [self appendTitle:title value:value valueOffset:offset fontSize:HLFontSizeTitleSmalle];
+}
+
+- (void)appendTitle:(NSString *)title value:(NSString *)value valueOffset:(NSInteger)offset fontSize:(HLFontSize)fontSize
+{
+    // 1.设置对齐方式
+    [self setAlignment:HLTextAlignmentLeft];
+    // 2.设置字号
+    [self setFontSize:fontSize];
+    // 3.设置标题内容
+    [self setText:title];
+    // 4.设置内容偏移量
+    [self setOffset:offset];
+    // 5.设置实际值
+    [self setText:value];
+    // 6.换行
+    [self appendNewLine];
+    if (fontSize != HLFontSizeTitleSmalle) {
+        [self appendNewLine];
+    }
+}
+
+- (void)appendLeftText:(NSString *)left middleText:(NSString *)middle rightText:(NSString *)right isTitle:(BOOL)isTitle
+{
+    [self setAlignment:HLTextAlignmentLeft];
+    [self setFontSize:HLFontSizeTitleSmalle];
+    NSInteger offset = 0;
+    if (!isTitle) {
+        offset = 10;
+    }
+    
+    if (left) {
+        [self setText:left maxChar:10];
+    }
+    
+    if (middle) {
+        [self setOffset:150 + offset];
+        [self setText:middle];
+    }
+    
+    if (right) {
+        [self setOffset:300 + offset];
+        [self setText:right];
+    }
+    
+    [self appendNewLine];
+    
+}
+
+#pragma mark 图片
+- (void)appendImage:(UIImage *)image alignment:(HLTextAlignment)alignment maxWidth:(CGFloat)maxWidth
+{
+    if (!image) {
+        return;
+    }
+    // 1.设置图片对齐方式
+    [self setAlignment:alignment];
+    [self setLeftMargin:40];
+    
+    // 2.设置图片
+    UIImage *newImage = [image imageWithscaleMaxWidth:maxWidth];
+//    newImage = [newImage blackAndWhiteImage];
+    
+    NSData *imageData = [newImage bitmapData];
+    [_printerData appendData:imageData];
+    
+    // 3.换行
+    [self appendNewLine];
+    
+    // 4.打印图片后，恢复文字的行间距
+    Byte lineSpace[] = {0x1B,0x32};
+    [_printerData appendBytes:lineSpace length:sizeof(lineSpace)];
+}
+
+- (void)getBarCodeWithInfo:(NSString *)info alignment:(HLTextAlignment)alignment offset:(NSInteger)offset width:(NSInteger)width height:(NSInteger)height
+{
+    UIImage *image = [UIImage barCodeImageWithInfo:info];
+    if (!image) { return; }
+    
+    // alignment:HLTextAlignmentLeft
+    // offset:40
+    [self setAlignment:alignment];
+    [self setLeftMargin:offset];
+    
+    // width:300  height:150
+    UIImage *newImage = [image imageWithfixedWidth:width
+                                            height:height];
+    NSData *imageData = [newImage bitmapData];
+    [_printerData appendData:imageData];
+    
+    // 3.换行
+    [self appendNewLine];
+    
+    // 4.打印图片后，恢复文字的行间距
+    Byte lineSpace[] = {0x1B,0x32};
+    [_printerData appendBytes:lineSpace length:sizeof(lineSpace)];
+}
+
+- (void)appendBarCodeWithInfo:(NSString *)info
+{
+    [self appendBarCodeWithInfo:info alignment:HLTextAlignmentCenter maxWidth:300];
+}
+
+- (void)appendBarCodeWithInfo:(NSString *)info alignment:(HLTextAlignment)alignment maxWidth:(CGFloat)maxWidth
+{
+    UIImage *barImage = [UIImage barCodeImageWithInfo:info];
+    [self appendImage:barImage alignment:alignment maxWidth:maxWidth];
+}
+
+- (void)appendQRCodeWithInfo:(NSString *)info size:(NSInteger)size
+{
+    [self appendQRCodeWithInfo:info size:size alignment:HLTextAlignmentCenter];
+}
+
+- (void)appendQRCodeWithInfo:(NSString *)info size:(NSInteger)size alignment:(HLTextAlignment)alignment
+{
+    [self appendQRCodeWithInfo:info size:size alignment:alignment offset:0];
+}
+
+- (void)appendQRCodeWithInfo:(NSString *)info size:(NSInteger)size alignment:(HLTextAlignment)alignment offset:(NSInteger)offset
+{
+    [self setAlignment:alignment];
+    [self setOffset:offset];
+    [self setQRCodeSize:size];
+    [self setQRCodeErrorCorrection:48];
+    [self setQRCodeInfo:info];
+    [self printStoredQRData];
+    [self appendNewLine];
+    [self appendNewLine];
+}
+
+- (void)appendQRCodeWithInfo:(NSString *)info
+{
+    [self appendQRCodeWithInfo:info centerImage:nil alignment:HLTextAlignmentCenter maxWidth:250];
+}
+
+- (void)appendQRCodeWithInfo:(NSString *)info centerImage:(UIImage *)centerImage alignment:(HLTextAlignment)alignment maxWidth:(CGFloat )maxWidth
+{
+    UIImage *QRImage = [UIImage qrCodeImageWithInfo:info centerImage:centerImage width:maxWidth];
+    [self appendImage:QRImage alignment:alignment maxWidth:maxWidth];
+}
+
+/**
+ 添加自定义的data
+ 
+ @param data 自定义的data
+ */
+- (void)appendCustomData:(NSData *)data
+{
+    if (data.length <= 0) {
+        return;
+    }
+    [_printerData appendData:data];
+}
+
+#pragma mark 其他
+- (void)appendSeperatorLine
+{
+    // 1.设置分割线居中
+    [self setAlignment:HLTextAlignmentLeft];
+    [self setLeftMargin:5];
+    // 2.设置字号
+    [self setFontSize:HLFontSizeTitleSmalle];
+    // 3.添加分割线
+    NSString *line = @"- - - - - - - - - - - - - - - -";
+    NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
+    NSData *data = [line dataUsingEncoding:enc];
+    [_printerData appendData:data];
+    // 4.换行
+    [self appendNewLine];
+}
+
+- (void)appendFooter:(NSString *)footerInfo
+{
+    [self appendSeperatorLine];
+    if (!footerInfo) {
+        footerInfo = @"马上来货运";
+    }
+    
+    NSUInteger lengthT = [self stringEncode:footerInfo];
+    if (lengthT <= 32) {
+        NSInteger offset = (32 - lengthT)/2 * (25/2);
+        [self appendTitle:@"" value:footerInfo valueOffset:offset fontSize:HLFontSizeTitleSmalle];
+    } else {
+        [self appendTitle:@"" value:footerInfo valueOffset:0 fontSize:HLFontSizeTitleSmalle];
+    }
+        
+    [self appendNewLine];
+    [self appendNewLine];
+    [self appendNewLine];
+}
+
+- (NSData *)getFinalData
+{
+    return _printerData;
+}
+
+- (NSUInteger)stringEncode:(NSString *)s {
+    NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
+    NSData *data = [s dataUsingEncoding:enc];
+    NSUInteger lengthT = [data length];
+    return lengthT;
+}
+
+@end

ios/Classes/HLPrinter/SEBLEConst.h

+//
+//  SEBLEConst.h
+//  blue_thermal_printer
+//
+//  Created by 袁静春 on 2022/7/19.
+//
+
+#ifndef SEBLEConst_h
+#define SEBLEConst_h
+
+#import <CoreBluetooth/CoreBluetooth.h>
+
+/**
+ *  打印回调
+ *
+ *  @param completion 是否完成
+ *  @param error      错误信息
+ */
+typedef void(^SEPrintResult)(CBPeripheral *connectPerpheral, BOOL completion, NSString *error);
+
+#endif /* SEBLEConst_h */

ios/Classes/HLPrinter/UIImage+Bitmap.h

+//
+//  UIImage+Bitmap.h
+//  HLBluetoothDemo
+//
+//  Created by Harvey on 16/5/3.
+//  Copyright © 2016年 Halley. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+typedef NS_ENUM(NSInteger,BitPixels) {
+    BPAlpha = 0,
+    BPBlue = 1,
+    BPGreen = 2,
+    BPRed = 3
+};
+
+@interface UIImage (Bitmap)
+
+/**
+ *  将图片转换为点阵图数据
+ *
+ *  @return 转化后的点阵图数据
+ */
+- (NSData *)bitmapData;
+
+/**
+ *  将图片绘制到绘图上下文中，并返回上下文
+ *
+ *  @return
+ */
+//+ (CGContextRef)bitmapRGBA8ContextFromImage:(CGImageRef)image;
+- (CGContextRef)bitmapRGBA8Context;
+
+/**
+ *  缩放图片，会按照给定的最大宽度，等比缩放
+ *
+ *  @param maxWidth 缩放后的最大宽度
+ *
+ *  @return 返回缩放后的图片
+ */
+- (UIImage *)imageWithscaleMaxWidth:(CGFloat)maxWidth;
+
+/**
+ *  将图片转换为黑白图片
+ *
+ *  @return 黑白图片
+ */
+- (UIImage *)blackAndWhiteImage;
+
+/**
+ *  缩放图片，会按照给定的宽、高缩放
+ *
+ *  @return 返回缩放后的图片
+ */
+- (UIImage *)imageWithfixedWidth:(CGFloat)width height:(CGFloat)height;
+
+@end
+
+#pragma mark - -----------制作二维码 条形码------------
+@interface UIImage (QRCode)
+
+/**
+ *  创建条形码
+ *
+ *  @param info 字符串信息
+ *
+ *  @return 条形码图片
+ */
++ (UIImage *)barCodeImageWithInfo:(NSString *)info;
+
+/**
+ *  创建二维码
+ *
+ *  @param info  二维码内的信息
+ *  @param image 二维码中心的logo图片
+ *  @param width 二维码的宽度
+ *
+ *  @return 二维码图片
+ */
++ (UIImage *)qrCodeImageWithInfo:(NSString *)info centerImage:(UIImage *)image  width:(CGFloat)width;
+
+/**
+ *  将CIImage 放大显示，并转换为UIImage。
+ *
+ *  @param image 原始CIImage
+ *  @param size  最终尺寸的宽度
+ *
+ *  @return UIImage
+ */
++ (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat)size;
+
+/**
+ *  将原图转变为背景色透明，图片为设置的颜色
+ *
+ *  @param image 要改变的图片
+ *  @param red   red
+ *  @param green green
+ *  @param blue  blue
+ *
+ *  @return 返回修改后的图片
+ */
++ (UIImage*)imageBgColorToTransparentWith:(UIImage*)image withRed:(CGFloat)red andGreen:(CGFloat)green andBlue:(CGFloat)blue;
+
+@end

ios/Classes/HLPrinter/UIImage+Bitmap.m

+//
+//  UIImage+Bitmap.m
+//  HLBluetoothDemo
+//
+//  Created by Harvey on 16/5/3.
+//  Copyright © 2016年 Halley. All rights reserved.
+//
+
+#import "UIImage+Bitmap.h"
+
+#import <AVFoundation/AVFoundation.h>
+
+@implementation UIImage (Bitmap)
+
+//
+- (NSData *)bitmapData
+{
+    CGImageRef imageRef = self.CGImage;
+    // Create a bitmap context to draw the uiimage into
+    CGContextRef context = [self bitmapRGBA8Context];
+    
+    if(!context) {
+        return nil;
+    }
+    
+    size_t width = CGImageGetWidth(imageRef);
+    size_t height = CGImageGetHeight(imageRef);
+    
+    CGRect rect = CGRectMake(0, 0, width, height);
+    
+    // Draw image into the context to get the raw image data
+    CGContextDrawImage(context, rect, imageRef);
+    
+    // Get a pointer to the data
+    uint32_t *bitmapData = (uint32_t *)CGBitmapContextGetData(context);
+    
+    
+    if(bitmapData) {
+        
+        uint8_t *m_imageData = (uint8_t *) malloc(width * height/8 + 8*height/8);
+        memset(m_imageData, 0, width * height/8 + 8*height/8);
+        int result_index = 0;
+        
+        for(int y = 0; (y + 24) < height; ) {
+            m_imageData[result_index++] = 27;
+            m_imageData[result_index++] = 51;
+            m_imageData[result_index++] = 0;
+            
+            m_imageData[result_index++] = 27;
+            m_imageData[result_index++] = 42;
+            m_imageData[result_index++] = 33;
+            
+            m_imageData[result_index++] = width%256;
+            m_imageData[result_index++] = width/256;
+            for(int x = 0; x < width; x++) {
+                int value = 0;
+                for (int temp_y = 0 ; temp_y < 8; ++temp_y)
+                {
+                    uint8_t *rgbaPixel = (uint8_t *) &bitmapData[(y+temp_y) * width + x];
+                    uint32_t gray = 0.3 * rgbaPixel[BPRed] + 0.59 * rgbaPixel[BPGreen] + 0.11 * rgbaPixel[BPBlue];
+                    
+                    if (gray < 127)
+                    {
+                        value += 1<<(7-temp_y)&255;
+                    }
+                    
+                }
+                m_imageData[result_index++] = value;
+                
+                value = 0;
+                for (int temp_y = 8 ; temp_y < 16; ++temp_y)
+                {
+                    uint8_t *rgbaPixel = (uint8_t *) &bitmapData[(y+temp_y) * width + x];
+                    uint32_t gray = 0.3 * rgbaPixel[BPRed] + 0.59 * rgbaPixel[BPGreen] + 0.11 * rgbaPixel[BPBlue];
+                    
+                    if (gray < 127)
+                    {
+                        value += 1<<(7-temp_y%8)&255;
+                    }
+                    
+                }
+                m_imageData[result_index++] = value;
+                
+                value = 0;
+                for (int temp_y = 16 ; temp_y < 24; ++temp_y)
+                {
+                    uint8_t *rgbaPixel = (uint8_t *) &bitmapData[(y+temp_y) * width + x];
+                    uint32_t gray = 0.3 * rgbaPixel[BPRed] + 0.59 * rgbaPixel[BPGreen] + 0.11 * rgbaPixel[BPBlue];
+                    
+                    if (gray < 127)
+                    {
+                        value += 1<<(7-temp_y%8)&255;
+                    }
+                    
+                }
+                m_imageData[result_index++] = value;
+            }
+            m_imageData[result_index++] = 13;
+            m_imageData[result_index++] = 10;
+            y += 24;
+        }
+        
+        NSMutableData *data = [[NSMutableData alloc] initWithCapacity:0];
+        [data appendBytes:m_imageData length:result_index];
+        
+        free(bitmapData);
+        return data;
+    }
+    
+    NSLog(@"Error getting bitmap pixel data\n");
+    CGContextRelease(context);
+    
+    return nil ; 
+}
+
+- (CGContextRef)bitmapRGBA8Context
+{
+    CGImageRef imageRef = self.CGImage;
+    if (!imageRef) {
+        return NULL;
+    }
+    
+    CGContextRef context = NULL;
+    CGColorSpaceRef colorSpace;
+    uint32_t *bitmapData;
+    
+    size_t bitsPerPixel = 32;
+    size_t bitsPerComponent = 8;
+    size_t bytesPerPixel = bitsPerPixel / bitsPerComponent;
+    
+    size_t width = CGImageGetWidth(imageRef);
+    size_t height = CGImageGetHeight(imageRef);
+    
+    size_t bytesPerRow = width * bytesPerPixel;
+    size_t bufferLength = bytesPerRow * height;
+    
+    colorSpace = CGColorSpaceCreateDeviceRGB();
+    
+    if(!colorSpace) {
+        NSLog(@"Error allocating color space RGB\n");
+        return NULL;
+    }
+    
+    // Allocate memory for image data
+    bitmapData = (uint32_t *)malloc(bufferLength);
+    
+    if(!bitmapData) {
+        NSLog(@"Error allocating memory for bitmap\n");
+        CGColorSpaceRelease(colorSpace);
+        return NULL;
+    }
+    
+    //Create bitmap context
+    
+    context = CGBitmapContextCreate(bitmapData,
+                                    width,
+                                    height,
+                                    bitsPerComponent,
+                                    bytesPerRow,
+                                    colorSpace,
+                                    kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedLast);	// RGBA
+    if(!context) {
+        free(bitmapData);
+        NSLog(@"Bitmap context not created");
+    }
+    
+    CGColorSpaceRelease(colorSpace);
+    
+    return context;	
+
+}
+
+- (UIImage *)imageWithscaleMaxWidth:(CGFloat)maxWidth
+{
+    CGFloat width = self.size.width;
+    if (width > maxWidth)
+    {
+        CGFloat height = self.size.height;
+        CGFloat maxHeight = maxWidth * height / width;
+        CGSize size = CGSizeMake(maxWidth, maxHeight);
+        UIGraphicsBeginImageContext(size);
+        [self drawInRect:CGRectMake(0, 0, maxWidth, maxHeight)];
+        UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();
+        UIGraphicsEndImageContext();
+        return resultImage;
+    }
+    return self;
+}
+
+- (UIImage *)imageWithfixedWidth:(CGFloat)width height:(CGFloat)height
+{
+    CGSize size = CGSizeMake(width, height);
+    UIGraphicsBeginImageContext(size);
+    [self drawInRect:CGRectMake(0, 0, width, height)];
+    UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();
+    UIGraphicsEndImageContext();
+    return resultImage;
+}
+
+
+
+- (UIImage *)blackAndWhiteImage
+{
+    //    CGSize size = self.size;
+    CIImage *beginImage = [CIImage imageWithCGImage:self.CGImage];
+    CIFilter *filter = [CIFilter filterWithName:@"CIColorMonochrome"
+                                  keysAndValues:kCIInputImageKey,beginImage,kCIInputColorKey,[CIColor colorWithCGColor:[UIColor blackColor].CGColor],nil];
+    
+    CIImage *outputImage = [filter outputImage];
+    
+    CIContext *context = [CIContext contextWithOptions:nil];
+    CGImageRef imageRef = [context createCGImage:outputImage fromRect:outputImage.extent];
+    UIImage *newImage = [UIImage imageWithCGImage:imageRef];
+    
+    //    UIImage *newImage = [UIImage createNonInterpolatedUIImageFormCIImage:outputImage withSize:size.width];
+
+    return newImage;
+}
+
+@end
+
+@implementation UIImage (QRCode)
+
++ (UIImage *)barCodeImageWithInfo:(NSString *)info
+{
+    // 创建条形码
+    CIFilter *filter = [CIFilter filterWithName:@"CICode128BarcodeGenerator"];
+    
+    // 恢复滤镜的默认属性
+    [filter setDefaults];
+    // 将字符串转换成NSData
+    NSData *data = [info dataUsingEncoding:NSUTF8StringEncoding];
+    // 通过KVO设置滤镜inputMessage数据
+    [filter setValue:data forKey:@"inputMessage"];
+    // 获得滤镜输出的图像
+    CIImage *outputImage = [filter outputImage];
+    // 将CIImage转换成UIImage，并放大显示
+    UIImage *image =[self createNonInterpolatedUIImageFormCIImage:outputImage withSize:300];
+    NSLog(@"将CIImage转换成UIImage: width=%f, height=%f", image.size.width, image.size.height);
+    return image;
+}
+
++ (UIImage *)qrCodeImageWithInfo:(NSString *)info centerImage:(UIImage *)centerImage  width:(CGFloat)width
+{
+    if (!info) {
+        return nil;
+    }
+    
+    NSData *strData = [info dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:NO];
+    //创建二维码滤镜
+    CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
+    [qrFilter setValue:strData forKey:@"inputMessage"];
+    [qrFilter setValue:@"H" forKey:@"inputCorrectionLevel"];
+    CIImage *qrImage = qrFilter.outputImage;
+    
+    UIImage *codeImage = [UIImage createNonInterpolatedUIImageFormCIImage:qrImage withSize:width];
+    
+    //二维码rect
+    CGRect rect = CGRectMake(0, 0, codeImage.size.width, codeImage.size.height);
+    UIGraphicsBeginImageContext(rect.size);
+    [codeImage drawInRect:rect];
+    //定制logo
+    if (centerImage) {
+        //icon尺寸,UIBezierPath
+        CGSize logoSize = CGSizeMake(rect.size.width*0.2, rect.size.height*0.2);
+        CGFloat x = CGRectGetMidX(rect) - logoSize.width*0.5;
+        CGFloat y = CGRectGetMidY(rect) - logoSize.height*0.5;
+        CGRect logoFrame = CGRectMake(x, y, logoSize.width, logoSize.height);
+        [[UIBezierPath bezierPathWithRoundedRect:logoFrame cornerRadius:10] addClip];
+        
+        [centerImage drawInRect:logoFrame];
+    }
+    UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();
+    UIGraphicsEndImageContext();
+    return resultImage;
+}
+
++ (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat)size
+{
+    CGRect extent = CGRectIntegral(image.extent);
+    CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
+    // 创建bitmap;
+    size_t width = CGRectGetWidth(extent) * scale;
+    size_t height = CGRectGetHeight(extent) * scale;
+    CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();
+    CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);
+    CIContext *context = [CIContext contextWithOptions:nil];
+    CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];
+    CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);
+    CGContextScaleCTM(bitmapRef, scale, scale);
+    CGContextDrawImage(bitmapRef, extent, bitmapImage);
+    // 保存bitmap到图片
+    CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
+    CGContextRelease(bitmapRef);
+    CGImageRelease(bitmapImage);
+    return [UIImage imageWithCGImage:scaledImage];
+}
+
+void ProviderReleaseData (void *info, const void *data, size_t size){
+    free((void*)data);
+}
+
++ (UIImage*)imageBgColorToTransparentWith:(UIImage*)image withRed:(CGFloat)red andGreen:(CGFloat)green andBlue:(CGFloat)blue{
+    const int imageWidth = image.size.width;
+    const int imageHeight = image.size.height;
+    size_t      bytesPerRow = imageWidth * 4;
+    uint32_t* rgbImageBuf = (uint32_t*)malloc(bytesPerRow * imageHeight);
+    // create context
+    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
+    CGContextRef context = CGBitmapContextCreate(rgbImageBuf, imageWidth, imageHeight, 8, bytesPerRow, colorSpace,
+                                                 kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipLast);
+    CGContextDrawImage(context, CGRectMake(0, 0, imageWidth, imageHeight), image.CGImage);
+    // traverse pixe
+    int pixelNum = imageWidth * imageHeight;
+    uint32_t* pCurPtr = rgbImageBuf;
+    for (int i = 0; i < pixelNum; i++, pCurPtr++){
+        if ((*pCurPtr & 0xFFFFFF00) < 0x99999900){
+            // change color
+            uint8_t* ptr = (uint8_t*)pCurPtr;
+            ptr[3] = red; //0~255
+            ptr[2] = green;
+            ptr[1] = blue;
+        }else{
+            uint8_t* ptr = (uint8_t*)pCurPtr;
+            ptr[0] = 0;
+        }
+    }
+    // context to image
+    CGDataProviderRef dataProvider = CGDataProviderCreateWithData(NULL, rgbImageBuf, bytesPerRow * imageHeight, ProviderReleaseData);
+    CGImageRef imageRef = CGImageCreate(imageWidth, imageHeight, 8, 32, bytesPerRow, colorSpace,
+                                        kCGImageAlphaLast | kCGBitmapByteOrder32Little, dataProvider,
+                                        NULL, true, kCGRenderingIntentDefault);
+    CGDataProviderRelease(dataProvider);
+    UIImage* resultUIImage = [UIImage imageWithCGImage:imageRef];
+    // release
+    CGImageRelease(imageRef);
+    CGContextRelease(context);
+    CGColorSpaceRelease(colorSpace);
+    return resultUIImage;
+}
+
+@end

ios/Classes/SwiftBlueThermalPrinterPlugin.swift

+import Flutter
+import UIKit
+
+public class SwiftBlueThermalPrinterPlugin: NSObject, FlutterPlugin {
+    
+    public static func register(with registrar: FlutterPluginRegistrar) {
+        let channel = FlutterMethodChannel(name: "blue_thermal_printer", binaryMessenger: registrar.messenger())
+        let instance = SwiftBlueThermalPrinterPlugin()
+        registrar.addMethodCallDelegate(instance, channel: channel)
+    }
+    
+    public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
+        result("iOS " + UIDevice.current.systemVersion)
+    }
+    
+}

ios/Classes/TscCommand.h

+//
+//  TscCommand.h
+//  Gprinter
+//
+
+#import <Foundation/Foundation.h>
+#import <UIKit/UIKit.h>
+
+typedef NS_ENUM (NSUInteger,Response){
+    OFF     = 0,//关闭自动返回状态功能
+    ON      = 1,//打开自动返回状态功能，每打印完一张返回一次
+    BATCH   = 2,//打开自动返回状态功能，打印完毕后返回一次
+};
+
+@interface TscCommand : NSObject
+
+/**
+ * 方法说明：设置标签尺寸的宽和高
+ * @param width  标签宽度
+ * @param height 标签高度
+ */
+-(void) addSize:(int) width :(int) height;
+
+/**
+ * 方法说明：设置标签间隙尺寸 单位mm
+ * @param m    间隙长度
+ * @param n    间隙偏移
+ */
+-(void) addGapWithM:(int) m withN:(int) n;
+
+/**
+ * 方法说明：设置标签原点坐标
+ * @param x  横坐标
+ * @param y  纵坐标
+ */
+-(void) addReference:(int) x :(int)y;
+
+/**
+ * 方法说明：设置打印速度
+ * @param speed  打印速度
+ */
+-(void) addSpeed:(int) speed;
+
+/**
+ * 方法说明：设置打印浓度
+ * @param density  浓度
+ */
+-(void) addDensity:(int) density;
+
+/**
+ * 方法说明：设置打印方向
+ * @param direction  方向
+ */
+-(void) addDirection:(int) direction;
+
+/**
+ * 方法说明：清除打印缓冲区
+ */
+-(void) addCls;
+
+/**
+ * 方法说明:在标签上绘制文字
+ * @param x 横坐标
+ * @param y 纵坐标
+ * @param font  字体类型
+ * @param rotation  旋转角度
+ * @param xScal  横向放大
+ * @param yScal  纵向放大
+ * @param text   文字字符串
+ */
+-(void) addTextwithX:(int)x withY:(int)y withFont:(NSString*)font withRotation:(int)rotation withXscal:(int)xScal withYscal:(int)yScal withText:(NSString*) text;
+
+/*
+ BITMAP X, Y, width, height, mode, bitmap data
+ 参 数 说 明
+ x 点阵影像的水平启始位置
+ y 点阵影像的垂直启始位置
+ width 影像的宽度，以 byte 表示
+ height 影像的高度，以点(dot)表示
+ mode 影像绘制模式
+ 0 OVERWRITE
+ 1 OR
+ 2 XOR
+ bitmap data 影像数据
+ */
+-(void) addBitmapwithX:(int)x withY:(int) y withWidth:(int) width withHeight:(int) height withMode:(int) mode withData:(NSData*) data;
+
+-(void)addBitmapwithX:(int)x withY:(int)y withMode:(int)mode withWidth:(int)width withImage:(UIImage *)image;
+
+-(void)addBitmapwithX:(int)x withY:(int)y withMode:(int)mode withImage:(UIImage *)image;
+
+/**
+ * 方法说明:在标签上绘制一维条码
+ * @param x 横坐标
+ * @param y 纵坐标
+ * @param barcodeType 条码类型
+ * @param height  条码高度，默认为40
+ * @param readable  是否可识别，0:  人眼不可识，1:   人眼可识
+ * @param rotation  旋转角度，条形码旋转角度，顺时钟方向，0不旋转，90顺时钟方向旋转90度，180顺时钟方向旋转180度，270顺时钟方向旋转270度
+ * @param narrow 默认值2，窄 bar  宽度，以点(dot)表示
+ * @param wide 默认值4，宽 bar  宽度，以点(dot)表示
+ * @param content   条码内容
+ BARCODE X,Y,"code type",height,human readable,rotation,narrow,wide,"code"
+ BARCODE 100,100,"39",40,1,0,2,4,"1000"
+ BARCODE 10,10,"128",40,1,0,2,2,"124096ABCDEFZ$%+-./*"
+ "code type":
+ EAN13("EAN13"),
+ EAN8("EAN8"),
+ UPCA("UPCA"),
+ ITF14("ITF14"),
+ CODE39("39"),
+ CODE128("128"),
+ */
+-(void) add1DBarcode:(int)x :(int)y :(NSString*)barcodeType :(int)height :(int)readable :(int)rotation :(int)narrow :(int)wide :(NSString*)content;
+
+/**
+ * 方法说明:在标签上绘制QRCode二维码
+ * @param x 横坐标
+ * @param y 纵坐标
+ * @param ecclever 选择QRCODE纠错等级,L为7%,M为15%,Q为25%,H为30%
+ * @param cellwidth  二维码宽度1~10，默认为4
+ * @param mode  默认为A，A为Auto,M为Manual
+ * @param rotation  旋转角度，QRCode二维旋转角度，顺时钟方向，0不旋转，90顺时钟方向旋转90度，180顺时钟方向旋转180度，270顺时钟方向旋转270度
+ * @param content   条码内容
+ * QRCODE X,Y ,ECC LEVER ,cell width,mode,rotation, "data string"
+ * QRCODE 20,24,L,4,A,0,"佳博集团网站www.Gprinter.com.cn"
+ */
+-(void) addQRCode:(int)x :(int)y :(NSString*)ecclever :(int)cellwidth :(NSString*)mode :(int)rotation :(NSString*)content;
+
+/**
+ * 方法说明：执行打印
+ * @param m
+ * @param n
+ */
+-(void) addPrint:(int) m :(int) n;
+
+/**
+ * 方法说明:获得打印命令
+ */
+-(NSData*) getCommand;
+
+/**
+ * 方法说明：将字符串转成十六进制码
+ * @param  str  命令字符串
+ */
+-(void) addStrToCommand:(NSString *) str;
+
+-(void) addNSDataToCommand:(NSData*) data;
+
+/**
+ * 方法说明：发送一些TSC的固定命令，在cls命令之前发送
+ */
+-(void) addComonCommand;
+
+/**
+ * 方法说明:打印自检页，打印测试页
+ */
+-(void) addSelfTest;
+
+/**
+ * 方法说明 :查询打印机型号
+ */
+-(void) queryPrinterType;
+
+/**
+ * 方法说明:设置打印机剥离模式
+ * @param peel ON/OFF  是否开启
+ */
+-(void) addPeel:(NSString *) peel;
+
+/**
+ * 方法说明:设置打印机撕离模式
+ * @param tear ON/OFF 是否开启
+ */
+-(void) addTear:(NSString *) tear;
+
+/**
+ * 方法说明:设置切刀是否有效
+ * @param cutter 是否开启 OFF/pieces (0<=pieces<=127)设定几张标签切一次
+ */
+-(void) addCutter:(NSString *) cutter;
+
+/**
+ * 方法说明:设置切刀半切是否有效
+ * @param cutter  是否开启
+ */
+-(void) addPartialCutter:(NSString *) cutter;
+
+/**
+ * 方法说明：设置蜂鸣器
+ * @param level 频率
+ * @param interval  时间ms
+ */
+-(void) addSound:(int) level :(int) interval;
+
+/**
+ * 方法说明：打开钱箱命令,CASHDRAWER m,t1,t2
+ * @param m  钱箱号 m      0，48  钱箱插座的引脚2        1，49  钱箱插座的引脚5
+ * @param t1   高电平时间0 ≤ t1 ≤ 255输出由t1和t2设定的钱箱开启脉冲到由m指定的引脚
+ * @param t2   低电平时间0 ≤ t2 ≤ 255输出由t1和t2设定的钱箱开启脉冲到由m指定的引脚
+ */
+-(void) addCashdrawer:(int) m :(int) t1 :(int) t2;
+
+/**
+ * 方法说明:在标签上绘制黑块，画线
+ * @param x 起始横坐标
+ * @param y 起始纵坐标
+ * @param width 线宽，以点(dot)表示
+ * @param height 线高，以点(dot)表示
+ */
+-(void) addBar:(int) x :(int) y :(int) width :(int) height;
+
+/**
+ * 方法说明:在标签上绘制矩形
+ * @param xStart 起始横坐标
+ * @param yStart 起始纵坐标
+ * @param xEnd 终点横坐标
+ * @param yEnd 终点纵坐标
+ * @param lineThickness 矩形框线厚度或宽度，以点(dot)表示
+ */
+-(void) addBox:(int) xStart :(int) yStart :(int) xEnd :(int) yEnd :(int) lineThickness;
+
+/**
+ * 方法说明:查询打印机状态<ESC>!?
+	*询问打印机状态指令为立即响应型指令，该指令控制字符是以<ESC> (ASCII 27=0x1B, escape字符)为控制字符.!(ASCII 33=0x21),?(ASCII 63=0x3F)
+	*即使打印机在错误状态中仍能透过 RS-232  回传一个 byte  资料来表示打印机状态，若回传值为 0  则表示打印
+	*机处于正常的状态
+ */
+-(void) queryPrinterStatus;
+
+/**
+ * 方法说明:将指定的区域反向打印（黑色变成白色，白色变成黑色）
+ * @param xStart 起始横坐标
+ * @param yStart 起始横坐标
+ * @param xWidth X坐标方向宽度，dot为单位
+ * @param yHeight Y坐标方向高度，dot为单位
+ */
+-(void) addReverse:(int) xStart :(int) yStart :(int) xWidth :(int) yHeight;
+
+/**
+ *  方法说明: 打印机打印完成时，自动返回状态。可用于实现连续打印功能
+ *  @param response  自动返回状态  <a>@see Response</a>
+ *                  OFF     关闭自动返回状态功能
+ *                  ON      开启自动返回状态功能
+ *                  BATCH   全部打印完成后返回状态
+ */
+-(void)addQueryPrinterStatus:(Response)response;
+
+/**
+ *  方法说明: 查询打印机电量。
+ *  <p>返回值:  31（低电量）；32 (中电量)；33 (高电量)；35 (正在充电)</p>
+ *
+ */
+-(void)queryElectricity;
+@end

ios/blue_thermal_printer.podspec

+#
+# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html
+#
+Pod::Spec.new do |s|
+  s.name             = 'blue_thermal_printer'
+  s.version          = '0.0.1'
+  s.summary          = 'A new Flutter plugin for connecting to thermal printer vie bluetooth'
+  s.description      = <<-DESC
+A new Flutter plugin for connecting to thermal printer vie bluetooth
+                       DESC
+  s.homepage         = 'http://example.com'
+  s.license          = { :file => '../LICENSE' }
+  s.author           = { 'Your Company' => 'email@example.com' }
+  s.source           = { :path => '.' }
+  s.source_files = 'Classes/**/*'
+  s.public_header_files = 'Classes/**/*.h'
+  s.vendored_libraries = 'Classes/*.a'
+  s.dependency 'Flutter'
+  s.ios.deployment_target = '8.0'
+end
+

ios/bluethermalprinter.podspec

+#
+# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html.
+# Run `pod lib lint bluethermalprinter.podspec` to validate before publishing.
+#
+Pod::Spec.new do |s|
+  s.name             = 'bluethermalprinter'
+  s.version          = '0.0.1'
+  s.summary          = 'A new flutter plugin project.'
+  s.description      = <<-DESC
+A new flutter plugin project.
+                       DESC
+  s.homepage         = 'http://example.com'
+  s.license          = { :file => '../LICENSE' }
+  s.author           = { 'Your Company' => 'email@example.com' }
+  s.source           = { :path => '.' }
+  s.source_files = 'Classes/**/*'
+  s.vendored_libraries = 'Classes/*.a'
+  s.dependency 'Flutter'
+  s.platform = :ios, '9.0'
+
+  # Flutter.framework does not contain a i386 slice.
+  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386' }
+  s.swift_version = '5.0'
+end

lib/blue_thermal_printer.dart

+/// 蓝牙热敏打印
+library blue_thermal_printer;
+
+export 'dart:async';
+export 'dart:convert';
+export 'dart:math';
+export 'dart:typed_data';
+
+export 'package:fast_gbk/fast_gbk.dart';
+export 'package:flutter/services.dart';
+
+export 'blue_thermal_printer_plugin.dart';
+export 'types/bluetooth_device.dart';
+export 'types/bluetooth_device.dart';
+export 'utils/logutil.dart';
+export 'utils/printer_commands_utils.dart';
+export 'utils/printer_data_utils.dart';
+
+

lib/blue_thermal_printer_plugin.dart

+import 'package:blue_thermal_printer/blue_thermal_printer.dart';
+
+class BlueThermalPrinter {
+  static const int STATE_OFF = 10;
+  static const int STATE_TURNING_ON = 11;
+  static const int STATE_ON = 12;
+  static const int STATE_TURNING_OFF = 13;
+  static const int STATE_BLE_TURNING_ON = 14;
+  static const int STATE_BLE_ON = 15;
+  static const int STATE_BLE_TURNING_OFF = 16;
+  static const int ERROR = -1;
+  static const int CONNECTED = 1;
+  static const int DISCONNECTED = 0;
+
+  static const String namespace = 'blue_thermal_printer';
+
+  static const MethodChannel _channel =
+      const MethodChannel('$namespace/methods');
+
+  static const EventChannel _readChannel =
+      const EventChannel('$namespace/read');
+
+  static const EventChannel _stateChannel =
+      const EventChannel('$namespace/state');
+
+  final StreamController<MethodCall> _methodStreamController =
+      new StreamController.broadcast();
+
+  static BlueThermalPrinter _instance = new BlueThermalPrinter._();
+
+  static BlueThermalPrinter get instance => _instance;
+
+  BlueThermalPrinter._() {
+    _channel.setMethodCallHandler((MethodCall call) async {
+      _methodStreamController.add(call);
+    });
+  }
+
+  ///onStateChanged()
+  Stream<int?> onStateChanged() =>
+      _stateChannel.receiveBroadcastStream().map((buffer) => buffer);
+
+  ///onRead()
+  Stream<String> onRead() =>
+      _readChannel.receiveBroadcastStream().map((buffer) => buffer.toString());
+
+  Future<bool?> get isAvailable async =>
+      await _channel.invokeMethod('isAvailable');
+
+  Future<bool?> get isOn async => await _channel.invokeMethod('isOn');
+
+  Future<bool?> get isConnected async =>
+      await _channel.invokeMethod('isConnected');
+
+  Future<bool?> get openSettings async =>
+      await _channel.invokeMethod('openSettings');
+
+  ///getBondedDevices()
+  Future<List<BluetoothDevice>> getBondedDevices() async {
+    final List list = await (_channel.invokeMethod('getBondedDevices'));
+    return list.map((map) => BluetoothDevice.fromMap(map)).toList();
+  }
+
+  Future<String> getLastDevice() async {
+    final String getLastDeviceName =
+        await (_channel.invokeMethod('getLastDevice'));
+    return getLastDeviceName;
+  }
+
+  ///printQRcode(String textToQR, int width, int height, int align)
+
+  Future<List<int>> getQRcode(String textToQR, int width, int height, int align,
+      {int? light = 0, int? weight = 0}) async {
+    final List<int> QRcode = await (_channel.invokeMethod('getQRcode', {
+      'textToQR': textToQR,
+      'width': width,
+      'height': height,
+      'align': align,
+      'light': light,
+      'weight': weight
+    }));
+    return QRcode;
+  }
+
+  Future<List<int>> getBarCode(
+      String textToBar, int width, int height, int align,
+      {int? light = 0, int? weight = 0}) async {
+    final List<int> barCode = await (_channel.invokeMethod('getBarCode', {
+      'textToBar': textToBar,
+      'width': width,
+      'height': height,
+      'align': align,
+      'light': light,
+      'weight': weight
+    }));
+    return barCode;
+  }
+
+  ///connect(BluetoothDevice device)
+  Future<dynamic> connect(BluetoothDevice device) =>
+      _channel.invokeMethod('connect', device.toMap());
+
+  ///disconnect()
+  Future<dynamic> disconnect() => _channel.invokeMethod('disconnect');
+
+  ///write(String message)
+  Future<dynamic> write(String message) =>
+      _channel.invokeMethod('write', {'message': message});
+
+  ///writeBytes(Uint8List message)
+  Future<dynamic> writeBytes(Uint8List message) =>
+      _channel.invokeMethod('writeBytes', {'message': message});
+
+  Future<dynamic> printTSCImage(Map<String, dynamic> config, List<Map<String, dynamic>> data) {
+    Map<String, Object> args = Map();
+    args['config'] = config;
+    args['data'] = data;
+    print("---- $args");
+    _channel.invokeMethod('printTSCImage', args);
+    return Future.value(true);
+  }
+
+
+  ///iOS平台使用
+  ///printSampleCode(String qrcode, String barcode,
+  ///         String title, String subTitle, String smallSubTitle, String bottomContent)
+  Future<dynamic> printSampleCode(String qrcode, String barcode, String title,
+          String subTitle, String smallSubTitle, String bottomContent) =>
+      _channel.invokeMethod('printSampleCode', {
+        'qrcode': qrcode,
+        'barcode': barcode,
+        'title': title,
+        'subTitle': subTitle,
+        'smallSubTitle': smallSubTitle,
+        'bottomContent': bottomContent,
+      });
+
+  ///repeatScan()
+  Future<dynamic> repeatScan() => _channel.invokeMethod('repeatScan');
+
+  ///printCustom(String message, int size, int align,{String? charset})
+  Future<dynamic> printText(String message, int size, int align,
+          {String? charset,
+          String? format,
+          int? light = 0,
+          int? weight = 0,
+          bool? bold = false}) =>
+      _channel.invokeMethod('printText', {
+        'message': message,
+        'size': size,
+        'bold': bold,
+        'align': align,
+        'charset': charset,
+        'format': format,
+        'light': light,
+        'weight': weight
+      });
+
+  ///printNewLine()
+  Future<dynamic> printNewLine() => _channel.invokeMethod('printNewLine');
+
+  ///paperCut()
+  Future<dynamic> paperCut() => _channel.invokeMethod('paperCut');
+
+  ///initPrinter()
+  Future<dynamic> initPrinter() => _channel.invokeMethod('initPrinter');
+
+  ///initMarginLeft(int left)
+  Future<dynamic> printMarginLeft(int left) =>
+      _channel.invokeMethod('printMarginLeft', {'left': left});
+
+  ///printImage(String pathImage)
+  Future<dynamic> printImage(String pathImage) =>
+      _channel.invokeMethod('printImage', {'pathImage': pathImage});
+
+  ///printImageBytes(Uint8List bytes)
+  Future<dynamic> printImageBytes(Uint8List bytes) =>
+      _channel.invokeMethod('printImageBytes', {'bytes': bytes});
+
+  ///printQRcode(String textToQR, int width, int height, int align)
+  Future<dynamic> printQRcode(String textToQR, int width, int height, int align,
+          {int? light = 0, int? weight = 0}) =>
+      _channel.invokeMethod('printQRcode', {
+        'textToQR': textToQR,
+        'width': width,
+        'height': height,
+        'align': align,
+        'light': light,
+        'weight': weight
+      });
+
+  ///printQRcode(String textToQR, int width, int height, int align)
+  Future<dynamic> printBarCode(
+          String textToBar, int width, int height, int align,
+          {int? light = 0, int? weight = 0}) =>
+      _channel.invokeMethod('printBarCode', {
+        'textToBar': textToBar,
+        'width': width,
+        'height': height,
+        'align': align,
+        'light': light,
+        'weight': weight
+      });
+}

lib/types/bluetooth_device.dart

+class BluetoothDevice {
+  final String? name;
+  final String? address;
+  final int type = 0;
+  bool connected = false;
+
+  BluetoothDevice(this.name, this.address);
+
+  BluetoothDevice.fromMap(Map map)
+      : name = map['name'],
+        address = map['address'];
+
+  Map<String, dynamic> toMap() => {
+        'name': this.name,
+        'address': this.address,
+        'type': this.type,
+        'connected': this.connected,
+      };
+
+  operator ==(Object other) {
+    return other is BluetoothDevice && other.address == this.address;
+  }
+
+  @override
+  int get hashCode => address.hashCode;
+}

lib/utils/logutil.dart

+class LogUtil {
+  static var _separator = "=";
+  static var _split =
+      "$_separator$_separator$_separator$_separator$_separator$_separator$_separator$_separator$_separator";
+  static var _title = "Yl-Log";
+  static var _isDebug = true;
+  static int _limitLength = 800;
+  static String _startLine = "$_split$_title$_split";
+  static String _endLine = "$_split$_separator$_separator$_separator$_split";
+
+  static void init({String title = "", required bool isDebug, int? limitLength}) {
+    _title = title;
+    _isDebug = isDebug;
+    _limitLength = limitLength ??= _limitLength;
+    _startLine = "$_split$_title$_split";
+    var endLineStr = StringBuffer();
+    var cnCharReg = RegExp("[\u4e00-\u9fa5]");
+    for (int i = 0; i < _startLine.length; i++) {
+      if (cnCharReg.stringMatch(_startLine[i]) != null) {
+        endLineStr.write(_separator);
+      }
+      endLineStr.write(_separator);
+    }
+    _endLine = endLineStr.toString();
+  }
+
+  //仅Debug模式可见
+  static void d(dynamic obj) {
+    if (_isDebug) {
+      _log(obj.toString());
+    }
+  }
+
+  static void v(dynamic obj) {
+    _log(obj.toString());
+  }
+
+  static void _log(String msg) {
+    print("$_startLine");
+    _logEmptyLine();
+    if (msg.length < _limitLength) {
+      print(msg);
+    } else {
+      segmentationLog(msg);
+    }
+    _logEmptyLine();
+    print("$_endLine");
+  }
+
+  static void segmentationLog(String msg) {
+    var outStr = StringBuffer();
+    for (var index = 0; index < msg.length; index++) {
+      outStr.write(msg[index]);
+      if (index % _limitLength == 0 && index != 0) {
+        print(outStr);
+        outStr.clear();
+        var lastIndex = index + 1;
+        if (msg.length - lastIndex < _limitLength) {
+          var remainderStr = msg.substring(lastIndex, msg.length);
+          print(remainderStr);
+          break;
+        }
+      }
+    }
+  }
+
+  static void _logEmptyLine() {
+    print("");
+  }
+}

lib/utils/printer_commands_utils.dart

+import 'package:blue_thermal_printer/blue_thermal_printer.dart';
+
+class PrinterCommands {
+  static const HT = 0x9;
+  static const LF = 0x0A;
+  static const CR = 0x0D;
+  static const ESC = 0x1B;
+  static const DLE = 0x10;
+  static const GS = 0x1D;
+  static const FS = 0x1C;
+  static const STX = 0x02;
+  static const US = 0x1F;
+  static const CAN = 0x18;
+  static const CLR = 0x0C;
+  static const EOT = 0x04;
+
+  static const initPrinter = [ESC, 0x40];
+  static const FEED_LINE = [0x0A];
+
+  ///设置左边距
+  /// left 用 nL 和 nH 设定左边空白量为（nL+ Nh*256）*0.125 毫米。
+  static printMarginLeft({int left = 0}) {
+    List<int> result = [];
+    result.add(0x1D);
+    result.add(0x4C);
+    result.add(left ~/ 0.125);
+    result.add(0);
+    return result;
+  }
+
+  ///字体变大为标准的n倍
+  static fontSizeSetBig({int size = 0}) {
+    var realSize = 1;
+    switch (size) {
+      case 1:
+        realSize = 0x00;
+        break;
+      case 2:
+        realSize = 0x11;
+        break;
+      case 3:
+        realSize = 0x22;
+        break;
+      case 4:
+        realSize = 0x33;
+        break;
+      case 5:
+        realSize = 0x44;
+        break;
+      case 6:
+        realSize = 0x55;
+        break;
+      case 7:
+        realSize = 0x66;
+        break;
+      case 8:
+        realSize = 0x77;
+        break;
+    }
+    List<int> result = [];
+    result.add(0x1D);
+    result.add(0x21);
+    result.add(realSize);
+    return result;
+  }
+
+  /// 设置汉字字符左右间距
+  static setCharHSpace({int charSpace = 0}) {
+    List<int> result = [];
+    result.add(0x1C);
+    result.add(0x53);
+    result.add(charSpace);
+    result.add(charSpace);
+    return result;
+  }
+
+  ///是否加粗
+  static bold({bool bold = false}) {
+    List<int> result = [];
+    if (bold) {
+      result.add(ESC);
+      result.add(69);
+      result.add(0xF);
+    } else {
+      result.add(ESC);
+      result.add(69);
+      result.add(0);
+    }
+    return result;
+  }
+
+  /// 打印条形码
+  /// 73 CODE128
+  static createBarCode(Uint8List infoByte) {
+    List<int> result = [];
+    var width = setBarCodeWidth(2);
+    var height = setBarCodeHeight(120);
+    var bar = [0x1D, 0x6B, 73, infoByte.length];
+    result.addAll(width);
+    result.addAll(height);
+    result.addAll(bar);
+    result.addAll(infoByte);
+    return result;
+  }
+
+  /// 设置条形码 宽度
+  /// width 2 3 4
+  static setBarCodeWidth(width) {
+    List<int> result = [];
+    result.add(0x1D);
+    result.add(0x77);
+    result.add(width);
+    return result;
+  }
+
+  /// 设置条形码 高度
+  /// height 0≤n≤255，默认 n=162
+  static setBarCodeHeight(height) {
+    List<int> result = [];
+    result.add(0x1D);
+    result.add(0x68);
+    result.add(height);
+    return result;
+  }
+}

lib/utils/printer_data_utils.dart

+import 'package:blue_thermal_printer/blue_thermal_printer.dart';
+
+class PrintData {
+  static double printPageWidth = 50; // 打印纸宽度 50mm
+  static double printTextWidth = 3; // 打印文字的宽度 3mm
+  static double printBaseUnitValue = 0.125; // 打印基准值 0.125mm
+
+  /// 初始化打印机
+  static initPrinter() {
+    return PrinterCommands.initPrinter;
+  }
+
+  /// 设置左边距
+  static printMarginLeft(int left) {
+    return PrinterCommands.printMarginLeft(left: left);
+  }
+
+  /// 空行
+  static printNewLine() {
+    return PrinterCommands.FEED_LINE;
+  }
+
+  /// 打印文字
+  /// message 文本
+  /// size 文字放大倍数
+  /// bold 是否加粗
+  /// charset 文本编码
+  /// space 文本间隙
+  static printText(String message,
+      {int size = 1,
+      bool bold = false,
+      CHARSET charset = CHARSET.GBK,
+      int space = 0}) {
+    List<int> data = [];
+    var textList = splitText(message, size, space);
+    for (var value in textList) {
+      data.addAll(_printLineText(value, size, bold, charset, space));
+    }
+    return data;
+  }
+
+  /// 打印一行
+  static List<int> _printLineText(
+      String text, int size, bool bold, CHARSET charset, int space) {
+    List<int> data = [];
+    // 左边距 = 打印纸宽度 - 文字宽度 ~/ 2
+    var left = getLeftMargin(text, size, space);
+    var textLeftMargin = PrinterCommands.printMarginLeft(left: left);
+    var textBold = PrinterCommands.bold(bold: bold);
+    var textSize = PrinterCommands.fontSizeSetBig(size: size);
+    var textSpace = PrinterCommands.setCharHSpace(charSpace: space);
+    List<int> content = [];
+    if (charset == CHARSET.GBK) {
+      content.addAll(gbk.encode(text));
+    } else {
+      content.addAll(utf8.encode(text));
+    }
+    var feedLine = PrinterCommands.FEED_LINE;
+    data.addAll(textLeftMargin);
+    data.addAll(textSize);
+    data.addAll(textBold);
+    data.addAll(textSpace);
+    data.addAll(content);
+    data.addAll(feedLine);
+    return data;
+  }
+
+  // 文字内容拆分多行
+  static List splitText(String text, int size, int space) {
+    var list = [];
+    var lineTextCount = getLineTextCount(size, space);
+    for (var i = 0; i < text.length; i = i + lineTextCount) {
+      list.add(text.substring(i, min(text.length, i + lineTextCount)));
+    }
+    return list;
+  }
+
+  // 一行显示的字数
+  // 字数 = 打印纸宽度 ~/ (打印字字宽度 * 字体放大倍数)
+  static int getLineTextCount(sizeMul, space) {
+    var textHSpace = 2 * space * printBaseUnitValue; // 字符左右边距
+    return printPageWidth ~/ ((printTextWidth + textHSpace) * sizeMul);
+  }
+
+  // 左边距 = 打印纸宽度 - 文字宽度 ~/ 2
+  static int getLeftMargin(String text, sizeMul, int space) {
+    return (printPageWidth - getLineTextWidth(text, sizeMul, space)) ~/ 2 - 1;
+  }
+
+  // 一行字的宽度
+  // 一行字的总宽度 = 字数 * 打印字字宽度(字符宽度+字间距宽度) * 字体放大倍数
+  static double getLineTextWidth(String text, sizeMul, int space) {
+    var textHSpace = 2 * space * printBaseUnitValue; // 字符左右边距
+    var doubleCharCount = matchDoubleCharCount(text); // 双字节字符数量
+    var doubleCharWidth = doubleCharCount * (printTextWidth + textHSpace);
+    var singleCharWidth =
+        (text.length - doubleCharCount) * (printTextWidth / 2 + textHSpace);
+    // 字节宽度（单字节+双字节） * 字体放大倍数
+    return (doubleCharWidth + singleCharWidth) * sizeMul;
+  }
+
+  // 双字节字符个数
+  static matchDoubleCharCount(String text) {
+    int count = 0;
+    RegExp regDoubleChar = RegExp("[^\x00-\xff]");
+    for (var i = 0; i < text.length; i++) {
+      var char = text.substring(i, i+1);
+      if (regDoubleChar.hasMatch(char)) {
+        count++;
+      }
+    }
+    return count;
+  }
+
+  // 打印条形码
+  static printBarCode(String info, {CHARSET charset = CHARSET.UTF_8}) {
+    Uint8List infoByte;
+    if (charset == CHARSET.GBK) {
+      infoByte = Uint8List.fromList(gbk.encode(info));
+    } else {
+      infoByte = Uint8List.fromList(utf8.encode(info));
+    }
+    return PrinterCommands.createBarCode(infoByte);
+  }
+
+  /// 打印二维码
+  static printQRCode(String info, {CHARSET charset = CHARSET.UTF_8}) {
+    List<int> data = [];
+    ///设置二维码模块大小
+    var QRCodeSize = [0x1D,0x28,0x6B,0x03,0x00,0x31,0x43,8];
+
+    ///将二维码数据存储到符号存储区
+    //第一步
+    String str = info.toString();
+    var kLength = str.length + 3;
+    var pL = kLength % 256;
+    var pH = kLength ~/ 256;
+    var QRCodeInfo = [0x1D,0x28,0x6B,pL,pH,0x31,0x50,48];
+    //第二步
+    Uint8List infoByte;
+    if (charset == CHARSET.GBK) {
+      infoByte = Uint8List.fromList(gbk.encode(info));
+    } else {
+      infoByte = Uint8List.fromList(utf8.encode(info));
+    }
+    ///打印之前存储的二维码信息
+    var printStoredQRData = [0x1D,0x28,0x6B,0x03,0x00,0x31,0x51,48];
+    ///组装
+    data.addAll(QRCodeSize);
+    data.addAll(QRCodeInfo);
+    data.addAll(infoByte);
+    data.addAll(printStoredQRData);
+    return data;
+  }
+}
+
+/// 字体
+enum CHARSET {
+  UTF_8,
+  GBK,
+}

local.properties

+## This file must *NOT* be checked into Version Control Systems,
+# as it contains information specific to your local configuration.
+#
+# Location of the SDK. This is only used by Gradle.
+# For customization when using a Version Control System, please read the
+# header note.
+#Fri Mar 19 16:23:49 ICT 2021
+sdk.dir=E\:\\Users\\ZAKI\\AppData\\Local\\Android\\sdk

pubspec.lock

+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  async:
+    dependency: transitive
+    description:
+      name: async
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.8.2"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.0"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.0"
+  charcode:
+    dependency: transitive
+    description:
+      name: charcode
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.3.1"
+  clock:
+    dependency: transitive
+    description:
+      name: clock
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.0"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.15.0"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.0"
+  fast_gbk:
+    dependency: "direct main"
+    description:
+      name: fast_gbk
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.0.0"
+  flutter:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.12.11"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.1.3"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.7.0"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.8.0"
+  platform:
+    dependency: "direct dev"
+    description:
+      name: platform
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "3.1.0"
+  sky_engine:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.99"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.8.1"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.10.0"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.0"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.0"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.0"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.4.8"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.3.0"
+  vector_math:
+    dependency: transitive
+    description:
+      name: vector_math
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.1"
+sdks:
+  dart: ">=2.14.0 <3.0.0"
+  flutter: ">=1.10.0"

pubspec.yaml

+name: blue_thermal_printer
+description: A Flutter plugin for connecting to thermal printer via bluetooth
+version: 1.3.0
+homepage: https://github.com/kakzaki/blue_thermal_printer
+
+environment:
+  sdk: '>=2.12.0 <3.0.0'
+  flutter: ">=1.10.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+  # 编码转码 https://pub.dev/packages/fast_gbk
+  fast_gbk: ^1.0.0
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+
+# For information on the generic Dart part of this file, see the
+# following page: https://www.dartlang.org/tools/pub/pubspec
+  platform: ^3.1.0
+
+
+# The following section is specific to Flutter.
+flutter:
+  # This section identifies this Flutter project as a plugin project.
+  # The androidPackage and pluginClass identifiers should not ordinarily
+  # be modified. They are used by the tooling to maintain consistency when
+  # adding or updating assets for this project.
+  plugin:
+    platforms:
+      android:
+        package: id.kakzaki.blue_thermal_printer
+        pluginClass: BlueThermalPrinterPlugin
+#        fileName: blue_thermal_printer.dart
+      ios:
+        pluginClass: BlueThermalPrinterPlugin
+#        fileName: blue_thermal_printer.dart
+
+  # To add assets to your plugin package, add an assets section, like this:
+  # assets:
+  #  - images/a_dot_burr.jpeg
+  #  - images/a_dot_ham.jpeg
+  #
+  # For details regarding assets in packages, see
+  # https://flutter.dev/assets-and-images/#from-packages
+  #
+  # An image asset can refer to one or more resolution-specific "variants", see
+  # https://flutter.dev/assets-and-images/#resolution-aware.
+
+  # To add custom fonts to your plugin package, add a fonts section here,
+  # in this "flutter" section. Each entry in this list should have a
+  # "family" key with the font family name, and a "fonts" key with a
+  # list giving the asset and other descriptors for the font. For
+  # example:
+  # fonts:
+  #   - family: Schyler
+  #     fonts:
+  #       - asset: fonts/Schyler-Regular.ttf
+  #       - asset: fonts/Schyler-Italic.ttf
+  #         style: italic
+  #   - family: Trajan Pro
+  #     fonts:
+  #       - asset: fonts/TrajanPro.ttf
+  #       - asset: fonts/TrajanPro_Bold.ttf
+  #         weight: 700
+  #
+  # For details regarding fonts in packages, see
+  # https://flutter.dev/custom-fonts/#from-packages

test/blue_thermal_printer_test.dart

+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  const MethodChannel channel = MethodChannel('blue_thermal_printer');
+
+  setUp(() {
+    channel.setMockMethodCallHandler((MethodCall methodCall) async {
+      return '42';
+    });
+  });
+
+  tearDown(() {
+    channel.setMockMethodCallHandler(null);
+  });
+
+  test('getPlatformVersion', () async {
+    //expect(await BlueThermalPrinter.platformVersion, '42');
+  });
+}