android程序声音播一半没声,菜鸟求助：mediaplayer播放声音每次app运行第一次播放声音都无声...

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大家开发的时候有没有出现这样的情况　用mediaplayer来播放声音，第一次播放不会有声音，从第2次播放就有声音，app每次重新启动都会这样下面是代码求大神：

private void Play_Sound(){

MediaPlayer mp = MediaPlayer.create(OrderDetails.this, R.raw.mssage);

PowerManager pm=(PowerManager) getSystemService(PushSoundService.POWER_SERVICE);

PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.SCREEN_DIM_WAKE_LOCK, "bright");

wl.acquire();

if (mp!=null) {

mp.stop();

Log.v("mp", "不是空");

}

AudioManager audioManager = (AudioManager) getSystemService(Service.AUDIO_SERVICE);

int maxVolume =audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);

Log.v("maxVolume", ""+maxVolume);

maxVolume=maxVolume-3;

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC,maxVolume,0);

// mp.setAudioStreamType(AudioManager.STREAM_MUSIC);

// mp.prepareAsync();

// mp.setVolume(0.5f, 0.5f);

//mp.setd

try {

mp.prepare();

} catch (IllegalStateException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

mp.start();

mp.setOnCompletionListener(new OnCompletionListener() {

@Override

public void onCompletion(MediaPlayer arg0) {

// TODO Auto-generated method stub

arg0.release();

}

});

Log.v(tag, "音乐启动");

}