抑制系统音频音量以从应用程序内部播放通知音频

Question

MediaPlayer mPlay = MediaPlayer.create(this, R.raw.sound);
mPlay.start();

谢谢你的帮助

Answer 1

我在下面的链接中得到了这个问题的答案：

http://developer.android.com/training/management-audio/audio-focus.html

我们需要请求音频焦点（瞬时/永久），然后可以播放应用程序音频：

AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
// Request audio focus for playback
int result = am.requestAudioFocus(afChangeListener,
                             // Use the music stream.
                             AudioManager.STREAM_MUSIC,
                             // Request permanent focus.
                             AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);

if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
    // Start playback.
    Log.i(TAG, "...audiofocus granted....");
    MediaPlayer mPlay = MediaPlayer.create(this, R.raw.sound);
    mPlay.start();
}

OnAudioFocusChangeListener afChangeListener = new OnAudioFocusChangeListener() {
    public void onAudioFocusChange(int focusChange) {
        if (focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT) {
            // Pause playback
            Log.i(TAG, "....audiofocus loss transient in listener......");
        } else if (focusChange == AudioManager.AUDIOFOCUS_GAIN) {
            // Resume playback 
            Log.i(TAG, "....audiofocus gain in listener......");
        } else if (focusChange == AudioManager.AUDIOFOCUS_LOSS) {
            Log.i(TAG, "....audiofocus loss in listener......");
            //am.unregisterMediaButtonEventReceiver(RemoteControlReceiver);
            am.abandonAudioFocus(afChangeListener);
            // Stop playback
        }
    }
};