Make example project null safe.

Author: timbotimbo

example/lib/menu_screen.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 
 class MenuScreen extends StatefulWidget {
-  MenuScreen({Key key}) : super(key: key);
+  MenuScreen({Key? key}) : super(key: key);
 
   @override
   _MenuScreenState createState() => _MenuScreenState();
@@ -62,9 +62,11 @@ class _MenuScreenState extends State<MenuScreen> {
               Checkbox(
                 value: enableAR,
                 onChanged: (changed) {
-                  setState(() {
-                    enableAR = changed;
-                  });
+                  if (changed != null) {
+                    setState(() {
+                      enableAR = changed;
+                    });
+                  }
                 },
               ),
             ],
@@ -97,5 +99,10 @@ class _MenuListItem {
   final String route;
   final bool enableAR;
 
-  _MenuListItem({this.title, this.description, this.route, this.enableAR});
+  _MenuListItem({
+    required this.title,
+    required this.description,
+    required this.route,
+    required this.enableAR,
+  });
 }

example/lib/screens/api_screen.dart

@@ -3,14 +3,14 @@ import 'package:flutter_unity_widget/flutter_unity_widget.dart';
 import 'package:pointer_interceptor/pointer_interceptor.dart';
 
 class ApiScreen extends StatefulWidget {
-  ApiScreen({Key key}) : super(key: key);
+  ApiScreen({Key? key}) : super(key: key);
 
   @override
   _ApiScreenState createState() => _ApiScreenState();
 }
 
 class _ApiScreenState extends State<ApiScreen> {
-  // UnityWidgetController _unityWidgetController;
+  // UnityWidgetController? _unityWidgetController;
   double _sliderValue = 0.0;
 
   @override
@@ -152,9 +152,13 @@ class _ApiScreenState extends State<ApiScreen> {
     print('Received message from unity: ${message.toString()}');
   }
 
-  void onUnitySceneLoaded(SceneLoaded scene) {
-    print('Received scene loaded from unity: ${scene.name}');
-    print('Received scene loaded from unity buildIndex: ${scene.buildIndex}');
+  void onUnitySceneLoaded(SceneLoaded? scene) {
+    if (scene != null) {
+      print('Received scene loaded from unity: ${scene.name}');
+      print('Received scene loaded from unity buildIndex: ${scene.buildIndex}');
+    } else {
+      print('Received scene loaded from unity: null');
+    }
   }
 
   // Callback that connects the created controller to the unity controller

example/lib/screens/loader_screen.dart

@@ -3,14 +3,14 @@ import 'package:flutter_unity_widget/flutter_unity_widget.dart';
 import 'package:pointer_interceptor/pointer_interceptor.dart';
 
 class LoaderScreen extends StatefulWidget {
-  LoaderScreen({Key key}) : super(key: key);
+  LoaderScreen({Key? key}) : super(key: key);
 
   @override
   _LoaderScreenState createState() => _LoaderScreenState();
 }
 
 class _LoaderScreenState extends State<LoaderScreen> {
-  UnityWidgetController _unityWidgetController;
+  UnityWidgetController? _unityWidgetController;
   double _sliderValue = 0.0;
 
   @override
@@ -73,7 +73,7 @@ class _LoaderScreenState extends State<LoaderScreen> {
   }
 
   void setRotationSpeed(String speed) {
-    _unityWidgetController.postMessage(
+    _unityWidgetController?.postMessage(
       'Cube',
       'SetRotationSpeed',
       speed,

example/lib/screens/no_interaction_screen.dart

@@ -3,7 +3,7 @@ import 'package:flutter_unity_widget/flutter_unity_widget.dart';
 import 'package:pointer_interceptor/pointer_interceptor.dart';
 
 class NoInteractionScreen extends StatefulWidget {
-  NoInteractionScreen({Key key}) : super(key: key);
+  NoInteractionScreen({Key? key}) : super(key: key);
 
   @override
   _NoInteractionScreenState createState() => _NoInteractionScreenState();
@@ -13,7 +13,7 @@ class _NoInteractionScreenState extends State<NoInteractionScreen> {
   static final GlobalKey<ScaffoldState> _scaffoldKey =
       GlobalKey<ScaffoldState>();
 
-  UnityWidgetController _unityWidgetController;
+  UnityWidgetController? _unityWidgetController;
 
   @override
   void initState() {
@@ -22,7 +22,7 @@ class _NoInteractionScreenState extends State<NoInteractionScreen> {
 
   @override
   void dispose() {
-    _unityWidgetController.dispose();
+    _unityWidgetController?.dispose();
     super.dispose();
   }
 
@@ -68,7 +68,7 @@ class _NoInteractionScreenState extends State<NoInteractionScreen> {
   }
 
   void setRotationSpeed(String speed) {
-    _unityWidgetController.postMessage(
+    _unityWidgetController?.postMessage(
       'Cube',
       'SetRotationSpeed',
       speed,
@@ -79,9 +79,13 @@ class _NoInteractionScreenState extends State<NoInteractionScreen> {
     print('Received message from unity: ${message.toString()}');
   }
 
-  void onUnitySceneLoaded(SceneLoaded scene) {
-    print('Received scene loaded from unity: ${scene.name}');
-    print('Received scene loaded from unity buildIndex: ${scene.buildIndex}');
+  void onUnitySceneLoaded(SceneLoaded? scene) {
+    if (scene != null) {
+      print('Received scene loaded from unity: ${scene.name}');
+      print('Received scene loaded from unity buildIndex: ${scene.buildIndex}');
+    } else {
+      print('Received scene loaded from unity: null');
+    }
   }
 
   // Callback that connects the created controller to the unity controller

example/lib/screens/orientation_screen.dart

@@ -4,14 +4,14 @@ import 'package:flutter_unity_widget/flutter_unity_widget.dart';
 import 'package:pointer_interceptor/pointer_interceptor.dart';
 
 class OrientationScreen extends StatefulWidget {
-  OrientationScreen({Key key}) : super(key: key);
+  OrientationScreen({Key? key}) : super(key: key);
 
   @override
   _LoaderScreenState createState() => _LoaderScreenState();
 }
 
 class _LoaderScreenState extends State<OrientationScreen> {
-  UnityWidgetController _unityWidgetController;
+  UnityWidgetController? _unityWidgetController;
   double _sliderValue = 0.0;
 
   @override
@@ -90,7 +90,7 @@ class _LoaderScreenState extends State<OrientationScreen> {
   }
 
   void setRotationSpeed(String speed) {
-    _unityWidgetController.postMessage(
+    _unityWidgetController?.postMessage(
       'Cube',
       'SetRotationSpeed',
       speed,

example/lib/screens/simple_screen.dart

@@ -3,7 +3,7 @@ import 'package:flutter_unity_widget/flutter_unity_widget.dart';
 import 'package:pointer_interceptor/pointer_interceptor.dart';
 
 class SimpleScreen extends StatefulWidget {
-  SimpleScreen({Key key}) : super(key: key);
+  SimpleScreen({Key? key}) : super(key: key);
 
   @override
   _SimpleScreenState createState() => _SimpleScreenState();
@@ -13,7 +13,7 @@ class _SimpleScreenState extends State<SimpleScreen> {
   static final GlobalKey<ScaffoldState> _scaffoldKey =
       GlobalKey<ScaffoldState>();
 
-  UnityWidgetController _unityWidgetController;
+  UnityWidgetController? _unityWidgetController;
   double _sliderValue = 0.0;
 
   @override
@@ -23,7 +23,7 @@ class _SimpleScreenState extends State<SimpleScreen> {
 
   @override
   void dispose() {
-    _unityWidgetController.dispose();
+    _unityWidgetController?.dispose();
     super.dispose();
   }
 
@@ -84,7 +84,7 @@ class _SimpleScreenState extends State<SimpleScreen> {
   }
 
   void setRotationSpeed(String speed) {
-    _unityWidgetController.postMessage(
+    _unityWidgetController?.postMessage(
       'Cube',
       'SetRotationSpeed',
       speed,
@@ -95,9 +95,13 @@ class _SimpleScreenState extends State<SimpleScreen> {
     print('Received message from unity: ${message.toString()}');
   }
 
-  void onUnitySceneLoaded(SceneLoaded scene) {
-    print('Received scene loaded from unity: ${scene.name}');
-    print('Received scene loaded from unity buildIndex: ${scene.buildIndex}');
+  void onUnitySceneLoaded(SceneLoaded? scene) {
+    if (scene != null) {
+      print('Received scene loaded from unity: ${scene.name}');
+      print('Received scene loaded from unity buildIndex: ${scene.buildIndex}');
+    } else {
+      print('Received scene loaded from unity: null');
+    }
   }
 
   // Callback that connects the created controller to the unity controller

example/pubspec.yaml

@@ -6,7 +6,7 @@ description: Demonstrates how to use the flutter_unity_widget plugin.
 publish_to: "none" # Remove this line if you wish to publish to pub.dev
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: ">=2.12.0 <3.0.0"
 
 dependencies:
   cupertino_icons: ^1.0.0

example/test/widget_test.dart

@@ -19,7 +19,7 @@ void main() {
     expect(
       find.byWidgetPredicate(
         (Widget widget) =>
-            widget is Text && widget.data.startsWith('Running on:'),
+            widget is Text && (widget.data?.startsWith('Running on:') ?? false),
       ),
       findsOneWidget,
     );