/**
* Called by AudioManager on audio focus changes. Implementation of {@link
* AudioManager.OnAudioFocusChangeListener}
*/
@Override
public void onAudioFocusChange(int focusChange) {
LogHelper.d(TAG, "onAudioFocusChange. focusChange=", focusChange);
if (focusChange == AudioManager.AUDIOFOCUS_GAIN) {
// We have gained focus:
mAudioFocus = AUDIO_FOCUSED;
} else if (focusChange == AudioManager.AUDIOFOCUS_LOSS
|| focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT
|| focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK) {
// We have lost focus. If we can duck (low playback volume), we can keep playing.
// Otherwise, we need to pause the playback.
boolean canDuck = focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK;
mAudioFocus = canDuck ? AUDIO_NO_FOCUS_CAN_DUCK : AUDIO_NO_FOCUS_NO_DUCK;
// If we are playing, we need to reset media player by calling configMediaPlayerState
// with mAudioFocus properly set.
if (mState == PlaybackStateCompat.STATE_PLAYING && !canDuck) {
// If we don't have audio focus and can't duck, we save the information that
// we were playing, so that we can resume playback once we get the focus back.
mPlayOnFocusGain = true;
}
} else {
LogHelper.e(TAG, "onAudioFocusChange: Ignoring unsupported focusChange: ", focusChange);
}
configMediaPlayerState();
}
/**
* Called when there's an error playing media. When this happens, the media player goes to the
* Error state. We warn the user about the error and reset the media player.
*
* @see OnErrorListener
*/
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
LogHelper.e(TAG, "Media player error: what=" + what + ", extra=" + extra);
if (mCallback != null) {
mCallback.onError("MediaPlayer error " + what + " (" + extra + ")");
}
return true; // true indicates we handled the error
}
@Override
public void play(QueueItem item) {
mPlayOnFocusGain = true;
tryToGetAudioFocus();
registerAudioNoisyReceiver();
String mediaId = item.getDescription().getMediaId();
boolean mediaHasChanged = !TextUtils.equals(mediaId, mCurrentMediaId);
if (mediaHasChanged) {
mCurrentPosition = 0;
mCurrentMediaId = mediaId;
}
if (mState == PlaybackStateCompat.STATE_PAUSED && !mediaHasChanged && mMediaPlayer != null) {
configMediaPlayerState();
} else {
mState = PlaybackStateCompat.STATE_STOPPED;
relaxResources(false); // release everything except MediaPlayer
MediaMetadataCompat track =
mMusicProvider.getMusic(
MediaIDHelper.extractMusicIDFromMediaID(item.getDescription().getMediaId()));
String source =
MusicProvider.getTrackSource(track.getString(MediaMetadataCompat.METADATA_KEY_MEDIA_ID));
try {
createMediaPlayerIfNeeded();
mState = PlaybackStateCompat.STATE_BUFFERING;
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mMediaPlayer.setDataSource(source);
// Starts preparing the media player in the background. When
// it's done, it will call our OnPreparedListener (that is,
// the onPrepared() method on this class, since we set the
// listener to 'this'). Until the media player is prepared,
// we *cannot* call start() on it!
mMediaPlayer.prepareAsync();
// If we are streaming from the internet, we want to hold a
// Wifi lock, which prevents the Wifi radio from going to
// sleep while the song is playing.
mWifiLock.acquire();
if (mCallback != null) {
mCallback.onPlaybackStatusChanged(mState);
}
} catch (IOException ex) {
LogHelper.e(TAG, ex, "Exception playing song");
if (mCallback != null) {
mCallback.onError(ex.getMessage());
}
}
}
}