dart migrate add_to_app/android_view/flutter_module_using_plugin (#833)

add_to_app/android_view/flutter_module_using_plugin/lib/cell.dart

@@ -15,7 +15,7 @@ void main() {
 }
 
 class Cell extends StatefulWidget {
-  const Cell({Key key}) : super(key: key);
+  const Cell({Key? key}) : super(key: key);
 
   @override
   State<StatefulWidget> createState() => _CellState();
@@ -26,8 +26,8 @@ class _CellState extends State<Cell> with WidgetsBindingObserver {
   static final AccelerometerEvent defaultPosition = AccelerometerEvent(0, 0, 0);
 
   int cellNumber = 0;
-  Random _random;
-  AppLifecycleState appLifecycleState;
+  Random? _random;
+  AppLifecycleState? appLifecycleState;
 
   @override
   void initState() {
@@ -41,13 +41,13 @@ class _CellState extends State<Cell> with WidgetsBindingObserver {
       }
     });
     // Keep track of what the current platform lifecycle state is.
-    WidgetsBinding.instance.addObserver(this);
+    WidgetsBinding.instance!.addObserver(this);
     super.initState();
   }
 
   @override
   void dispose() {
-    WidgetsBinding.instance.removeObserver(this);
+    WidgetsBinding.instance!.removeObserver(this);
     super.dispose();
   }
 
@@ -62,8 +62,8 @@ class _CellState extends State<Cell> with WidgetsBindingObserver {
   Color randomLightColor() {
     _random ??= Random(cellNumber);
 
-    return Color.fromARGB(255, _random.nextInt(50) + 205,
-        _random.nextInt(50) + 205, _random.nextInt(50) + 205);
+    return Color.fromARGB(255, _random!.nextInt(50) + 205,
+        _random!.nextInt(50) + 205, _random!.nextInt(50) + 205);
   }
 
   @override
@@ -117,9 +117,9 @@ class _CellState extends State<Cell> with WidgetsBindingObserver {
                               // Figure out the phone's orientation relative
                               // to gravity's direction. Ignore the z vector.
                               transform: Matrix4.rotationX(
-                                  snapshot.data.y / gravity * pi / 2)
+                                  snapshot.data!.y / gravity * pi / 2)
                                 ..multiply(Matrix4.rotationY(
-                                    snapshot.data.x / gravity * pi / 2)),
+                                    snapshot.data!.x / gravity * pi / 2)),
                               alignment: Alignment.center,
                               child: const FlutterLogo(size: 72));
                         },

add_to_app/android_view/flutter_module_using_plugin/lib/main.dart

@@ -70,7 +70,7 @@ class CounterModel extends ChangeNotifier {
 /// It offers two routes, one suitable for displaying as a full screen and
 /// another designed to be part of a larger UI.
 class MyApp extends StatelessWidget {
-  const MyApp({Key key}) : super(key: key);
+  const MyApp({Key? key}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -87,7 +87,7 @@ class MyApp extends StatelessWidget {
 /// Wraps [Contents] in a Material [Scaffold] so it looks correct when displayed
 /// full-screen.
 class FullScreenView extends StatelessWidget {
-  const FullScreenView({Key key}) : super(key: key);
+  const FullScreenView({Key? key}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -109,7 +109,7 @@ class FullScreenView extends StatelessWidget {
 class Contents extends StatelessWidget {
   final bool showExit;
 
-  const Contents({this.showExit = false, Key key}) : super(key: key);
+  const Contents({this.showExit = false, Key? key}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {

add_to_app/android_view/flutter_module_using_plugin/pubspec.lock

@@ -120,21 +120,21 @@ packages:
       name: plugin_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.3"
+    version: "2.0.0"
   provider:
     dependency: "direct main"
     description:
       name: provider
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.3.3"
+    version: "5.0.0"
   sensors:
     dependency: "direct main"
     description:
       name: sensors
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.2+6"
+    version: "2.0.3"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -195,42 +195,42 @@ packages:
       name: url_launcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "5.7.10"
+    version: "6.0.6"
   url_launcher_linux:
     dependency: transitive
     description:
       name: url_launcher_linux
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.1+4"
+    version: "2.0.0"
   url_launcher_macos:
     dependency: transitive
     description:
       name: url_launcher_macos
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.1+9"
+    version: "2.0.0"
   url_launcher_platform_interface:
     dependency: transitive
     description:
       name: url_launcher_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.9"
+    version: "2.0.3"
   url_launcher_web:
     dependency: transitive
     description:
       name: url_launcher_web
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.5+3"
+    version: "2.0.1"
   url_launcher_windows:
     dependency: transitive
     description:
       name: url_launcher_windows
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.1+3"
+    version: "2.0.0"
   vector_math:
     dependency: transitive
     description:
@@ -240,4 +240,4 @@ packages:
     version: "2.1.0"
 sdks:
   dart: ">=2.12.0 <3.0.0"
-  flutter: ">=1.22.0"
+  flutter: ">=2.0.0"

add_to_app/android_view/flutter_module_using_plugin/pubspec.yaml

@@ -4,19 +4,19 @@ description: An example Flutter module that uses a plugin.
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.6.0-dev <3.0.0"
+  sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
   flutter:
     sdk: flutter
-  provider: ^4.1.0
-  url_launcher: ^5.2.5
-  sensors: ^0.4.2
+  provider: ^5.0.0
+  url_launcher: ^6.0.6
+  sensors: ^2.0.3
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  flutter_lints: ^1.0.0
+  flutter_lints: ^1.0.3
 
 flutter:
   uses-material-design: true