android Activity初次的启动的时候播放声音

代码例如以下：

private MediaPlayer mMediaPlayer;

mMediaPlayer = new MediaPlayer();
mMediaPlayer = MediaPlayer.create(this, R.raw.happy);
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mMediaPlayer.setLooping(true);
mMediaPlayer.start();

ok，问题解决~