minor refactoring / cleaning

lib/Globals.dart

@@ -17,6 +17,36 @@ Future<void> setupListenHandler() async {
   _session = await AudioSession.instance;
 
   await _session.configure(const AudioSessionConfiguration.music());
+
+  //TODO: Do I need to handle these events? audioplayers may be doing it already
+  //_session.interruptionEventStream.listen((event) {
+  //  if (event.begin) {
+  //    switch (event.type) {
+  //      case AudioInterruptionType.duck:
+  //        _listenHandler.duck();
+  //        break;
+  //      case AudioInterruptionType.pause:
+  //      case AudioInterruptionType.unknown:
+  //        _listenHandler.pause();
+  //        break;
+  //    }
+  //  } else {
+  //    switch (event.type) {
+  //      case AudioInterruptionType.duck:
+  //        _listenHandler.unDuck();
+  //        break;
+  //      case AudioInterruptionType.pause:
+  //        _listenHandler.play();
+  //        break;
+  //      case AudioInterruptionType.unknown:
+  //        break;
+  //    }
+  //  }
+  //});
+
+  //_session.becomingNoisyEventStream.listen((_) {
+  //  _listenHandler.pause();
+  //});
 }
 
 ListenHandler getListenHandlder() => _listenHandler;

lib/Listen.dart

@@ -45,6 +45,7 @@ class _PlayControlsState extends State<PlayControls>
     print("Listen init");
 
     _listenHandler.playbackState.listen((PlaybackState state) {
+      print("Playback state changed");
       setState(() {});
     });
   }

lib/ListenHandler.dart

@@ -11,18 +11,11 @@ class ListenHandler extends BaseAudioHandler {
 
   setup_player() {
     _player.setReleaseMode(ReleaseMode.release);
-  }
+    _player.onPlayerStateChanged.listen((event) {
+      print("Received audioplayers event: $event");
 
-  ListenHandler() {
-    setup_player();
-  }
-
-  bool isPlaying() => super.playbackState.value.playing;
-
-  @override
-  Future<void> play() async {
-    if (await startAudioSession()) {
-      _player.play(_radioSource, mode: PlayerMode.mediaPlayer);
+      switch (event) {
+        case PlayerState.playing:
           super.playbackState.add(PlaybackState(
                 controls: [
                   MediaControl.stop,
@@ -34,16 +27,52 @@ class ListenHandler extends BaseAudioHandler {
                 },
                 playing: true,
               ));
-    }
-  }
-
-  @override
-  Future<void> pause() async {
+          break;
+        case PlayerState.paused:
+        case PlayerState.stopped:
+        case PlayerState.completed:
+        case PlayerState.disposed:
           super.playbackState.add(PlaybackState(
                 controls: [],
                 systemActions: {},
                 playing: false,
               ));
+          break;
+      }
+    });
+  }
+
+  ListenHandler() {
+    setup_player();
+  }
+
+  bool isPlaying() => super.playbackState.value.playing;
+
+  double _duckVol = 0;
+
+  void duck() {
+    //TODO: Confirm I need to do this manually, it looks like audioplayers already does this
+    print("Duck requested");
+    //_duckVol = _player.volume;
+
+    //_player.setVolume(_duckVol - 0.4 > 0 ? _duckVol - 0.4 : 0.0);
+  }
+
+  void unDuck() {
+    //TODO: Confirm I need to do this manually, it looks like audioplayers already does this
+    print("Unduck requested");
+    //_player.setVolume(_duckVol);
+  }
+
+  @override
+  Future<void> play() async {
+    if (await startAudioSession()) {
+      _player.play(_radioSource, mode: PlayerMode.mediaPlayer);
+    }
+  }
+
+  @override
+  Future<void> pause() async {
     await stopAudioSession();
     _player.stop();
   }