support web and windows platfom

example/android/app/build.gradle

@@ -35,7 +35,7 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.screenshot.example"
-        minSdkVersion 16
+        minSdkVersion 17
         targetSdkVersion 30
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName

example/lib/main.dart

-// import 'dart:io';
+
 import 'dart:typed_data';
 
 import 'package:flutter/material.dart';
 import 'package:screenshot/screenshot.dart';
+// import 'package:webview_flutter/webview_flutter.dart';
 // import 'package:image_gallery_saver/image_gallery_saver.dart';
 
 void main() => runApp(MyApp());
@@ -57,6 +58,8 @@ class _MyHomePageState extends State<MyHomePage> {
 
   @override
   void initState() {
+    
+    // if (Platform.isAndroid) WebView.platform = SurfaceAndroidWebView(); 
     super.initState();
   }
 
@@ -87,23 +90,10 @@ class _MyHomePageState extends State<MyHomePage> {
       ),
       body: Container(
         child: new Center(
-          child: Column(
-            mainAxisAlignment: MainAxisAlignment.center,
-            children: <Widget>[
-              Screenshot(
-                controller: screenshotController,
-                child: Column(
-                  children: <Widget>[
-                    Text(
-                      'You have pushed the button this many times:' +
-                          _counter.toString(),
-                    ),
-                    FlutterLogo(),
-                  ],
-                ),
-              ),
-              _imageFile != null ? Image.memory(_imageFile) : Container(),
-            ],
+          child: Screenshot(
+            controller: screenshotController,
+            child:Text("HEllo"),
+         
           ),
         ),
       ),

example/pubspec.yaml

@@ -14,24 +14,19 @@ environment:
   # sdk: '>=2.12.0-259.8.beta <3.0.0'
 
 dependencies:
-  image_gallery_saver: ^1.1.0
-  screenshot:
-    path: ../
   flutter:
     sdk: flutter
-
-  # The following adds the Cupertino Icons font to your application.
-  # Use with the CupertinoIcons class for iOS style icons.
+  screenshot:
+    path: ../
   cupertino_icons: ^0.1.2
+  image_gallery_saver: ^1.1.0
 
 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
-
 # The following section is specific to Flutter.
 flutter:
 
@@ -39,18 +34,14 @@ flutter:
   # 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:
   #  - images/a_dot_burr.jpeg
   #  - images/a_dot_ham.jpeg
-
   # An image asset can refer to one or more resolution-specific "variants", see
   # https://flutter.io/assets-and-images/#resolution-aware.
-
   # For details regarding adding assets from package dependencies, see
   # https://flutter.io/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

lib/screenshot.dart

@@ -10,6 +10,11 @@ import 'package:flutter/widgets.dart';
 // import 'package:path_provider/path_provider.dart';
 import 'dart:ui' as ui;
 
+///
+///
+///Cannot capture Platformview due to issue https://github.com/flutter/flutter/issues/25306
+///
+///
 class ScreenshotController {
   GlobalKey _containerKey;
   ScreenshotController() {
@@ -19,58 +24,56 @@ class ScreenshotController {
   Future<Uint8List> capture({
     String path = "",
     double pixelRatio,
-    Duration delay: const Duration(milliseconds: 20)
+    Duration delay: const Duration(milliseconds: 20),
   }) {
     //Delay is required. See Issue https://github.com/flutter/flutter/issues/22308
     return new Future.delayed(delay, () async {
       try {
-        RenderRepaintBoundary boundary =
-            this._containerKey.currentContext.findRenderObject() as RenderRepaintBoundary;
-      pixelRatio = pixelRatio??MediaQuery.of(_containerKey.currentContext).devicePixelRatio;
-        ui.Image image = await boundary.toImage(pixelRatio: pixelRatio);
+        ui.Image image = await captureAsUiImage(
+          delay: Duration.zero,
+          pixelRatio: pixelRatio,
+        );
         ByteData byteData =
             await image.toByteData(format: ui.ImageByteFormat.png);
         Uint8List pngBytes = byteData.buffer.asUint8List();
-        // if (path == "") {
-        //   final directory = (await getApplicationDocumentsDirectory()).path;
-        //   String fileName = DateTime.now().toIso8601String();
-        //   path = '$directory/$fileName.png';
-        // }
-        // File imgFile = new File(path);
-        // await imgFile.writeAsBytes(pngBytes).then((onValue) {});
+
         return pngBytes;
       } catch (Exception) {
         throw (Exception);
       }
     });
   }
-  
-  
-  Future<ui.Image> captureAsUiImage({
-    double pixelRatio: 1,
-    Duration delay: const Duration(milliseconds: 20)
-  }) {
+
+  Future<ui.Image> captureAsUiImage(
+      {double pixelRatio: 1,
+      Duration delay: const Duration(milliseconds: 20)}) {
     //Delay is required. See Issue https://github.com/flutter/flutter/issues/22308
     return new Future.delayed(delay, () async {
       try {
-        RenderRepaintBoundary boundary =
-        this._containerKey.currentContext.findRenderObject();
-        return await boundary.toImage(pixelRatio: pixelRatio);
+        RenderRepaintBoundary boundary = this
+            ._containerKey
+            .currentContext
+            .findRenderObject() as RenderRepaintBoundary;
+        pixelRatio = pixelRatio ??
+            MediaQuery.of(_containerKey.currentContext).devicePixelRatio;
+        ui.Image image = await boundary.toImage(pixelRatio: pixelRatio);
+        return image;
       } catch (Exception) {
         throw (Exception);
       }
     });
   }
-  
 }
 
-
 class Screenshot<T> extends StatefulWidget {
   final Widget child;
   final ScreenshotController controller;
-  final GlobalKey containerKey;
-  const Screenshot({Key key, this.child, this.controller, this.containerKey})
-      : super(key: key);
+  const Screenshot({
+    Key key,
+    this.child,
+    this.controller,
+  }) : super(key: key);
+      
   @override
   State<Screenshot> createState() {
     return new ScreenshotState();
@@ -89,21 +92,21 @@ class ScreenshotState extends State<Screenshot> with TickerProviderStateMixin {
       _controller = widget.controller;
   }
 
-  @override
-  void didUpdateWidget(Screenshot oldWidget) {
-    super.didUpdateWidget(oldWidget);
+  // @override
+  // void didUpdateWidget(Screenshot oldWidget) {
+  //   // super.didUpdateWidget(oldWidget);
 
-    if (widget.controller != oldWidget.controller) {
-      widget.controller._containerKey = oldWidget.controller._containerKey;
-      if (oldWidget.controller != null && widget.controller == null)
-        _controller._containerKey = oldWidget.controller._containerKey;
-      if (widget.controller != null) {
-        if (oldWidget.controller == null) {
-          _controller = null;
-        }
-      }
-    }
-  }
+  //   // if (widget.controller != oldWidget.controller) {
+  //   //   widget.controller._containerKey = oldWidget.controller._containerKey;
+  //   //   if (oldWidget.controller != null && widget.controller == null)
+  //   //     _controller._containerKey = oldWidget.controller._containerKey;
+  //   //   if (widget.controller != null) {
+  //   //     if (oldWidget.controller == null) {
+  //   //       _controller = null;
+  //   //     }
+  //   //   }
+  //   // }
+  // }
 
   @override
   Widget build(BuildContext context) {
@@ -113,3 +116,4 @@ class ScreenshotState extends State<Screenshot> with TickerProviderStateMixin {
     );
   }
 }
+

pubspec.yaml

 name: screenshot
 description: Flutter Screenshot Package (Runtime). Capture any Widget as an image.
-version: 0.2.0
+version: 0.3.0
 homepage: https://github.com/SachinGanesh/screenshot
 
 environment:
   sdk: '>=2.8.0 <3.0.0'
   # sdk: '>=2.12.0-259.8.beta <3.0.0'
   
-analyzer:
-  enable-experiment:
-    - non-nullable
+# analyzer:
+#   enable-experiment:
+#     - non-nullable
 dependencies:
   path_provider: ^1.1.0
   flutter: