Pause video when app goes in background

packages/video_player/lib/video_player.dart

@@ -93,10 +93,13 @@ class VideoPlayerController extends ValueNotifier<VideoPlayerValue> {
   bool isDisposed = false;
   Completer<Null> _creatingCompleter;
   StreamSubscription<Map<String, dynamic>> _eventSubscription;
+  _VideoAppLifeCycleObserver _lifeCycleObserver;
 
   VideoPlayerController(this.uri) : super(new VideoPlayerValue(duration: null));
 
   Future<Null> initialize() async {
+    _lifeCycleObserver = new _VideoAppLifeCycleObserver(this);
+    _lifeCycleObserver.initialize();
     _creatingCompleter = new Completer<Null>();
     final Map<String, dynamic> response = await _channel.invokeMethod(
       'create',
@@ -159,6 +162,7 @@ class VideoPlayerController extends ValueNotifier<VideoPlayerValue> {
       }
     }
     isDisposed = true;
+    _lifeCycleObserver.dispose();
     super.dispose();
   }
 
@@ -261,6 +265,37 @@ class VideoPlayerController extends ValueNotifier<VideoPlayerValue> {
   }
 }
 
+class _VideoAppLifeCycleObserver extends WidgetsBindingObserver {
+  bool _wasPlayingBeforePause = false;
+  final VideoPlayerController _controller;
+
+  _VideoAppLifeCycleObserver(this._controller);
+
+  void initialize() {
+    WidgetsBinding.instance.addObserver(this);
+  }
+
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    switch (state) {
+      case AppLifecycleState.paused:
+        _wasPlayingBeforePause = _controller.value.isPlaying;
+        _controller.pause();
+        break;
+      case AppLifecycleState.resumed:
+        if (_wasPlayingBeforePause) {
+          _controller.play();
+        }
+        break;
+      default:
+    }
+  }
+
+  void dispose() {
+    WidgetsBinding.instance.removeObserver(this);
+  }
+}
+
 /// Displays the video controlled by [controller].
 class VideoPlayer extends StatelessWidget {
   final VideoPlayerController controller;