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场景：听音乐，来了电话，此时音乐停止，挂断电话，音乐继续。

1，在service的oncreate方法中加入以下代码：

// 创建audioMangerAudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);int result = audioManager.requestAudioFocus(this,        AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);

2，让service实现OnAudioFocusChangeListener接口后，实现onAudioFocusChange方法，实现代码如下：

/** ---------------音频焦点处理相关的方法--------------- **/@Overridepublic void onAudioFocusChange(int focusChange) {    switch (focusChange) {    case AudioManager.AUDIOFOCUS_GAIN:// 你已经得到了音频焦点。        System.out.println("-------------AUDIOFOCUS_GAIN---------------");        // resume playback        mMediaPlayer.start();        mMediaPlayer.setVolume(1.0f, 1.0f);        break;    case AudioManager.AUDIOFOCUS_LOSS:// 你已经失去了音频焦点很长时间了。你必须停止所有的音频播放        System.out.println("-------------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;        break;    case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:// 你暂时失去了音频焦点        System.out                .println("-------------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();        break;    case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:// 你暂时失去了音频焦点，但你可以小声地继续播放音频（低音量）而不是完全扼杀音频。        System.out                .println("-------------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;    }}

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