updated controls, android compatiblity

example/android/app/build.gradle

@@ -32,10 +32,15 @@ android {
         main.java.srcDirs += 'src/main/kotlin'
     }
 
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
-        applicationId "com.example.livekit_example"
-        minSdkVersion 16
+        applicationId "io.livekit.flutter_example"
+        minSdkVersion 21
         targetSdkVersion 30
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName

example/android/app/src/main/AndroidManifest.xml

@@ -1,7 +1,16 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.example.livekit_example">
+
+    <uses-feature android:name="android.hardware.camera" />
+    <uses-feature android:name="android.hardware.camera.autofocus" />
+    <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission android:name="android.permission.RECORD_AUDIO" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
+
    <application
-        android:label="livekit_example"
+        android:label="LiveKit Example"
         android:icon="@mipmap/ic_launcher">
         <activity
             android:name=".MainActivity"
@@ -32,6 +41,7 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
+
         <!-- Don't delete the meta-data below.
              This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
         <meta-data

example/lib/main.dart

@@ -31,8 +31,8 @@ class PreConnect extends StatefulWidget {
   @override
   State<StatefulWidget> createState() {
     return _PreConnectState(
-      'ws://localhost:7880',
-      'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJleHAiOjE5ODQzNDMyMzUsImlzcyI6IkFQSU1teGlMOHJxdUt6dFpFb1pKVjlGYiIsImp0aSI6InNlY29uZCIsIm5iZiI6MTYyNDM0MzIzNSwidmlkZW8iOnsicm9vbSI6Im15cm9vbSIsInJvb21Kb2luIjp0cnVlfX0.USJmnqcLabtsX5A0ZIjguG7jnbVkbZxi5RyPxLOXgOg',
+      '<livekit_host>',
+      '<access_token>',
     );
   }
 }

example/lib/room.dart

@@ -32,6 +32,20 @@ class _RoomState extends State<RoomWidget> with RoomDelegate {
     super.dispose();
   }
 
+  _onConnected() async {
+    // video will fail when running in ios simulator
+    try {
+      var localVideo = await LocalVideoTrack.createCameraTrack();
+      await widget.room.localParticipant.publishVideoTrack(localVideo);
+    } catch (e) {
+      print('could not publish video: $e');
+    }
+
+    var localAudio = await LocalAudioTrack.createTrack();
+    await widget.room.localParticipant.publishAudioTrack(localAudio);
+    sortParticipants();
+  }
+
   void _onChange() {
     sortParticipants();
   }
@@ -92,20 +106,6 @@ class _RoomState extends State<RoomWidget> with RoomDelegate {
     }
   }
 
-  _onConnected() async {
-    // video will fail when running in ios simulator
-    try {
-      var localVideo = await LocalVideoTrack.createCameraTrack();
-      await widget.room.localParticipant.publishVideoTrack(localVideo);
-    } catch (e) {
-      print('could not publish video: $e');
-    }
-
-    var localAudio = await LocalAudioTrack.createTrack();
-    await widget.room.localParticipant.publishAudioTrack(localAudio);
-    sortParticipants();
-  }
-
   @override
   Widget build(BuildContext context) {
     _lastContext = context;
@@ -184,6 +184,14 @@ class _VideoViewState extends State<VideoView> with ParticipantDelegate {
     super.dispose();
   }
 
+  @override
+  void didUpdateWidget(covariant VideoView oldWidget) {
+    oldWidget.participant.removeListener(_onParticipantChanged);
+    widget.participant.addListener(_onParticipantChanged);
+    _onParticipantChanged();
+    super.didUpdateWidget(oldWidget);
+  }
+
   // register for change so Flutter will re-build the widget upon change
   void _onParticipantChanged() {
     var subscribedVideos = widget.participant.videoTracks.values.where((pub) {
@@ -198,10 +206,13 @@ class _VideoViewState extends State<VideoView> with ParticipantDelegate {
         if (videoPub is RemoteTrackPublication) {
           videoPub.videoQuality = widget.quality;
         }
-        this.videoPub = videoPub;
-      } else {
-        this.videoPub = null;
+        // when muted, show placeholder
+        if (!videoPub.muted) {
+          this.videoPub = videoPub;
+          return;
+        }
       }
+      this.videoPub = null;
     });
   }
 

example/lib/src/controls.dart

@@ -14,15 +14,17 @@ class Controls extends StatefulWidget {
 }
 
 class _ControlsState extends State<Controls> {
+  CameraPosition position = CameraPosition.FRONT;
+
   @override
   void initState() {
     super.initState();
-    widget.participant.addListener(_onChange);
+    participant.addListener(_onChange);
   }
 
   @override
   void dispose() {
-    widget.participant.removeListener(_onChange);
+    participant.removeListener(_onChange);
     super.dispose();
   }
 
@@ -69,6 +71,31 @@ class _ControlsState extends State<Controls> {
     }
   }
 
+  _setCameraPosition(TrackPublication? pub, CameraPosition position) async {
+    if (this.position == position) {
+      return;
+    }
+    LocalVideoTrack? track;
+    if (pub?.track is LocalVideoTrack) {
+      track = pub!.track as LocalVideoTrack;
+    }
+
+    if (track == null) {
+      return;
+    }
+
+    try {
+      await track.restartTrack(LocalVideoTrackOptions(position: position));
+    } catch (e) {
+      print('could not restart track: $e');
+      return;
+    }
+
+    setState(() {
+      this.position = position;
+    });
+  }
+
   _exit() {
     widget.room.disconnect();
   }
@@ -100,7 +127,8 @@ class _ControlsState extends State<Controls> {
       videoPub = participant.videoTracks.values.first;
     }
 
-    if (videoPub != null && videoPub.muted) {
+    var videoEnabled = videoPub != null && !videoPub.muted;
+    if (videoEnabled) {
       buttons.add(IconButton(
         onPressed: _muteVideo,
         icon: const Icon(Icons.videocam_rounded),
@@ -112,11 +140,34 @@ class _ControlsState extends State<Controls> {
       ));
     }
 
+    if (position == CameraPosition.FRONT) {
+      buttons.add(IconButton(
+        icon: const Icon(Icons.video_camera_front_rounded),
+        onPressed: videoEnabled
+            ? () {
+                _setCameraPosition(videoPub, CameraPosition.BACK);
+              }
+            : null,
+      ));
+    } else {
+      buttons.add(IconButton(
+        icon: const Icon(Icons.video_camera_back_rounded),
+        onPressed: videoEnabled
+            ? () {
+                _setCameraPosition(videoPub, CameraPosition.FRONT);
+              }
+            : null,
+      ));
+    }
+
     buttons.add(IconButton(
       onPressed: _exit,
       icon: const Icon(Icons.close_rounded),
     ));
 
-    return Row(children: buttons);
+    return Row(
+      mainAxisAlignment: MainAxisAlignment.center,
+      children: buttons,
+    );
   }
 }