停止播放来自其他APP的音乐
答
您将不得不实施Mediaplayer的AudioFocus
。要做到这一点,你需要得到一个AudioManager
的实例。一旦你有了实例,你就可以使用requestAudioFocus
。
AudioManager am = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
// Request audio focus for playback
int result = am.requestAudioFocus(focusChangeListener,
// Use the music stream.
AudioManager.STREAM_MUSIC,
// Request permanent focus.
AudioManager.AUDIOFOCUS_GAIN);
if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
Log.d("AudioFocus", "Audio focus received");
return true;
} else {
Log.d("AudioFocus", "Audio focus NOT received");
return false;
}
}
AudioFocus
被分配给每个请求它的应用程序。当您的应用程序获得焦点时,它可以通过一个AudioManager.OnAudioFocusChangeListener
,它提供焦点更改发生时的回调。
如果应用程序获得音频焦点,并且另一个应用程序请求音频焦点,则重点将会提供给其他应用程序。 Android会通过OnAudioFocusChangeListener
通知您的应用程序,以便您的应用程序可以响应此更改。要接收焦点事件,您需要像这样传递AudioManager.OnAudioFocusChangeListener
的实例。
private OnAudioFocusChangeListener focusChangeListener =
new OnAudioFocusChangeListener() {
public void onAudioFocusChange(int focusChange) {
AudioManager am =(AudioManager)getSystemService(Context.AUDIO_SERVICE);
switch (focusChange) {
case (AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK) :
// Lower the volume while ducking.
mediaPlayer.setVolume(0.2f, 0.2f);
break;
case (AudioManager.AUDIOFOCUS_LOSS_TRANSIENT) :
pause();
break;
case (AudioManager.AUDIOFOCUS_LOSS) :
stop();
ComponentName component =new ComponentName(AudioPlayerActivity.this,MediaControlReceiver.class);
am.unregisterMediaButtonEventReceiver(component);
break;
case (AudioManager.AUDIOFOCUS_GAIN) :
// Return the volume to normal and resume if paused.
mediaPlayer.setVolume(1f, 1f);
mediaPlayer.start();
break;
default: break;
}
}
};
参考文档:https://developer.android.com/guide/topics/media-apps/volume-and-earphones.html
感谢ABHI,现在我能停止音乐,但无法恢复。 – user8269038
其他应用程序必须请求音频焦点。它将被授予该应用程序。 – Abhi
我没有让你想说什么? – user8269038