Android media viewer audio focus

Introduction

The android media viewer audio focus tutorial series describes how to support & use android’s AudioFocus for media playback

Also discussed will be supporting the becoming noisy event where a BroadcastReceiver will be setup.

Get Code

The code can be found on github from the following instructions below

https://github.com/mobapptuts/media-thumbnail-viewer.git Tag

media-viewer-audiofocus

or you can run this command

git clone https://github.com/mobapptuts/media-thumbnail-viewer.git –branch

media-viewer-audiofocus

This video describes how to import the code from github using android studio and also how to use git tags

Steps

Adding a listener for audio focus change

public class VideoPlayActivity extends AppCompatActivity implements SurfaceHolder.Callback, MediaPlayer.OnCompletionListener,
    AudioManager.OnAudioFocusChangeListener {

And inside the overridden method implement the calls for when the audio focus changes

@Override
  public void onAudioFocusChange(int audioFocusChanged) {
      switch (audioFocusChanged) {
          case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
              mediaPause();
              break;
          case AudioManager.AUDIOFOCUS_GAIN:
              mediaPlay();
              break;
          case AudioManager.AUDIOFOCUS_LOSS:
              mediaPause();
              break;
      }
  }

Creating activity members

These members will support the AudioManager and becoming noisy events

private AudioManager mAudioManager;
 private IntentFilter mNoisyIntentFilter;
 private AudioBecommingNoisy mAudioBecommingNoisy;

Created a BroadcastReceiver for the becoming noisy event

private class AudioBecommingNoisy extends BroadcastReceiver {
       @Override
       public void onReceive(Context context, Intent intent) {
           mediaPause();
       }
   }

Setup the AudioManager and becoming noisy members

@Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_video_play);

       mPlayPauseButton = (ImageButton) findViewById(R.id.videoPlayPauseButton);
       mSurfaceView = (SurfaceView) findViewById(R.id.videoSurfaceView);

       Intent callingIntent = this.getIntent();
       if(callingIntent != null) {
           mVideoUri = callingIntent.getData();
       }

       mAudioManager = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE);
       mAudioBecommingNoisy = new AudioBecommingNoisy();
       mNoisyIntentFilter = new IntentFilter(AudioManager.ACTION_AUDIO_BECOMING_NOISY);
   }

Playing the media

Before playing the media register the BroadcastReceiver for becoming noisy events.

Then make a request for audio focus. If granted play the media.

private void mediaPlay() {
        registerReceiver(mAudioBecommingNoisy, mNoisyIntentFilter);
        int requestAudioFocusResult = mAudioManager.requestAudioFocus(this, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);
        if(requestAudioFocusResult == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
            mMediaPlayer.start();
            mPlayPauseButton.setImageResource(R.mipmap.ic_media_pause);
        }
    }

Pausing the media

In the paused state we release the audio focus and unregister the BroadcastReceiver

private void mediaPause() {
      mMediaPlayer.pause();
      mPlayPauseButton.setImageResource(R.mipmap.ic_media_play);
      mAudioManager.abandonAudioFocus(this);
      unregisterReceiver(mAudioBecommingNoisy);
  }