Question

下面的代码在奥利奥之前一直有效，但是相同的代码在android pie中不起作用。请检查我的代码。

int audioFile = R.raw.ring;
mMediaPlayer = new MediaPlayer();
try {

    mMediaPlayer.setDataSource(this,
            Uri.parse("android.resource://com.blh.pickupfresh.resturentapp/" + audioFile));

    final AudioManager audioManager = (AudioManager) getApplicationContext().getSystemService(Context.AUDIO_SERVICE);
    audioManager.setStreamVolume(AudioManager.STREAM_RING,audioManager.getStreamMaxVolume(AudioManager.STREAM_RING),0);
    mMediaPlayer.setAudioStreamType(AudioManager.STREAM_RING);
    mMediaPlayer.setLooping(true);
    mMediaPlayer.prepare();
    mMediaPlayer.start();
} catch (Exception e) {
    e.printStackTrace();
}

Answer 1

尝试此代码

int audioFile = R.raw.ring;

if(mMediaPlayer == null)
    mMediaPlayer = new MediaPlayer();

try {
    final AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
    audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC), 0);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        mMediaPlayer.setAudioAttributes(new AudioAttributes.Builder()
                .setUsage(AudioAttributes.USAGE_MEDIA)
                .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
                .setLegacyStreamType(AudioManager.STREAM_MUSIC)
                .build());
    } else {
        mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    }

    mMediaPlayer.setLooping(true);
    mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() 
      {
          @Override
          public void onPrepared(MediaPlayer mp) {
               mp.start();
          }
      });

    mMediaPlayer.setDataSource(this, Uri.parse("android.resource://com.blh.pickupfresh.resturentapp/" + audioFile));
    mMediaPlayer.prepareAsync();

} catch (Exception e) {
    e.printStackTrace();
    Log.e(TAG,"ERROR=" + e.getMessage());
}

在这里，我使用了AudioManager.STREAM_MUSIC，并且增加了同一视频流的音量。即使在静音模式或免打扰下，它也会播放声音。

更新：对于某些设备上的Android 9 mMediaPlayer.prepare()，它需要花费几秒钟的时间，因此我们应将异步方法与回调及其工作结合使用。

在android系统中（至少是oreo + pie），当静音模式为开或 DND模式为开时，我们无法将AudioManager.STREAM_RING设置为NORMAL，因为会抛出异常

java.lang.SecurityException: Not allowed to change Do Not Disturb state。详情请参见In Android 7 (API level 24) my app is not allowed to mute phone (set ringer mode to silent)

无法在Android Pie中播放mp3（9）

1 个答案: