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.

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/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.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>