Handling focus in Android media player

gistfile1.java

	  @Override
    public void onPrepared(MediaPlayer mediaPlayer) {

        mIsPrepared = true;
        isLoadingNew = false;
        mLostFocus = false;

        if (startFocus() == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
            initForeground();

            mMediaPlayer.start();

            mDuration = mMediaPlayer.getDuration();

            checkProgress();

            if(mLastSongUID != null) {
                Bundle data = new Bundle();
                data.putString(Constant.UID, mLastSongUID);
                PlayerService.this.sendMessage(MSG_EVENT_MEDIA_PLAY_START, -1, -1, data);
            }
        }
        else {
            mLostFocus = true;
        }
    }
	
	  int startFocus() {
        AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
        return audioManager.requestAudioFocus(this, AudioManager.STREAM_MUSIC,
                AudioManager.AUDIOFOCUS_GAIN);
    }

    void endFocus() {
        AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
        audioManager.abandonAudioFocus(this);
    }
	
	  @Override
    public void onAudioFocusChange(int focusChange) {
        switch (focusChange) {
            case AudioManager.AUDIOFOCUS_GAIN:
                // resume playback
                if (mMediaPlayer == null) initPlayer();
                else if (mLostFocus) {
                    mLostFocus = mIsPaused = false;

                    mMediaPlayer.start();
                    checkProgress();

                    if(mLastSongUID != null) {
                        Bundle data = new Bundle();
                        data.putString(Constant.UID, mLastSongUID);
                        PlayerService.this.sendMessage(MSG_EVENT_MEDIA_PLAY_START, -1, -1, data);
                    }
                }
                mMediaPlayer.setVolume(1.0f, 1.0f);
                break;

            case AudioManager.AUDIOFOCUS_LOSS:
                // Lost focus for an unbounded amount of time: stop playback and release media player
                if (mMediaPlayer.isPlaying()) mMediaPlayer.stop();
                mMediaPlayer.release();
                mMediaPlayer = null;

                endForeground();
                break;

            case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
                // Lost focus for a short time, but we have to stop
                // playback. We don't release the media player because playback
                // is likely to resume
                if (mMediaPlayer.isPlaying()) {
                    mMediaPlayer.pause();
                    cancelCheckProgress();

                    if(!mMediaPlayer.isPlaying()) {
                        mLostFocus= mIsPaused = true;
                        PlayerService.this.sendMessage(MSG_EVENT_MEDIA_PLAY_PAUSE, -1, -1, null);
                    }
                }
                break;

            case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
                // Lost focus for a short time, but it's ok to keep playing
                // at an attenuated level
                if (mMediaPlayer.isPlaying()) mMediaPlayer.setVolume(0.1f, 0.1f);
                break;
        }
    }
	
	//set mLostFocus = false; whenever a command comes to the service e.g. play, pause, next, prev, seek etc