6

我的手机上有一个应用程序可以持续关注音频，即使没有声音播放也是如此。作为应用程序开发人员，我想知道我是否能够告知用户它是哪个应用程序，或者我是否可以判断我的应用程序是否具有音频焦点？

4

2 回答 2

7

我强烈怀疑是否有任何公共 API 可以告诉您目前哪个应用程序具有焦点。

您可以通过请求来跟踪您的应用是否具有音频焦点，例如：

AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
boolean requestGranted = AudioManager.AUDIOFOCUS_REQUEST_GRANTED == audioManager.requestAudioFocus(listener, AudioManager.STREAM_MUSIC,
                    AudioManager.AUDIOFOCUS_GAIN);
if(requestGranted){
   // you now has the audio focus
}

当您请求和放弃焦点时，您应该确保维护您的侦听器的单个实例，请在此处查看我的答案以解决音频焦点的常见问题

这是一个例子onAudioFocusChange()：

@Override
public void onAudioFocusChange(int focus) {

  switch (focus) {
    case AudioManager.AUDIOFOCUS_LOSS:
        Log.d(TAG,"AUDIOFOCUS_LOSS");
        // stop and release your player
        break;
    case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
        Log.d(TAG,"AUDIOFOCUS_LOSS_TRANSIENT");
        // pause your player
        break;
    case AudioManager.AUDIOFOCUS_GAIN:
        Log.d(TAG,"AUDIOFOCUS_GAIN");
        // restore volume and resume player if needed
        break;
    case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
        Log.d(TAG,"AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK");
        // Lower volume
        break;
   }
}
于 2013-01-02T21:09:13.027 回答
0

Maybe this method does what you want: AudioManager.isMusicActive() http://developer.android.com/reference/android/media/AudioManager.html#isMusicActive%28%29

于 2021-01-25T00:45:08.390 回答