我不知道这个.你有一些代码可以帮我学习吗？

videoV = (SurfaceView) findViewById(R.id.SurfaceView1);
    sh = videoV.getHolder();

    File path = Environment.getExternalStorageDirectory();
    File file = new File(path,"sample2.mp4");

    sh.addCallback(this);     
    mp = new MediaPlayer();
    mp.setDataSource(file.getAbsolutePath());
    mp.setDisplay(sh);
    mp.prepare();
    mp.start();