android开发，播放手机上音频，播放不了，求大神指点谢谢~

[阿申]

1、Activity代码
public class MainActivity extends Activity implements OnClickListener {

private Button paly;
private Button pause;
private Button stop;
private MediaPlayer mediaPlayer = new MediaPlayer();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
paly = (Button)findViewById(R.id.play);
pause = (Button)findViewById(R.id.pause);
stop = (Button)findViewById(R.id.stop);
paly.setOnClickListener(this);
pause.setOnClickListener(this);
stop.setOnClickListener(this);
initMediaPlayer();
}

private void initMediaPlayer(){
//指定文件，做好准备
try {
File file = new File(Environment.getExternalStorageDirectory(), "AllAround.mp3");
mediaPlayer.setDataSource(file.getPath());
mediaPlayer.prepare();
} catch (Exception e) {
e.printStackTrace();
}
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.play:
if (!mediaPlayer.isPlaying()) {
mediaPlayer.start();
}
break;
case R.id.pause:
if (mediaPlayer.isPlaying()) {
mediaPlayer.pause();
}
break;
case R.id.stop:
if (mediaPlayer.isPlaying()) {
mediaPlayer.reset();
}
break;
default:
break;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (mediaPlayer != null) {
mediaPlayer.stop();
mediaPlayer.release();
}
}
}

2、点击Play按钮报错内容

[weixin_41224699]

你这样写，别人怎么看
你把问题提示写出来

[r00_a2lBUR]

是在主线程播放吗？

[verejava]

Android 之 多媒体播放

http://www.verejava.com/?id=17474198200436