extras/audio/src/main/java/com/stanfy/enroscar/audio/audio/StreamingPlaybackController.java
protected void callStop() {
    playing = false;
    paused = false;
    context.startService(createStopIntent());
    onPlayingChanged();
    preparing = false;
    onPreparingChanged();
  }
protected void callStop() {
    playing = false;
    paused = false;
    context.startService(createStopIntent());
    onPlayingChanged();
    preparing = false;
    onPreparingChanged();
  }
Stop playback.