public class FullScreen extends Activity implements SurfaceHolder.Callback{
 private String IntentExtraData;
 private int msec;
 MediaPlayer mMediaPlayer;
 public SurfaceView sv;
 public SurfaceHolder sh;

public void onCreate(Bundle savedInstanceState) {
  
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fullscreen);
        sv = (SurfaceView)findViewById(R.id.videoV2);
        sh = sv.getHolder();
        sh.addCallback(this);  
        mMediaPlayer = new MediaPlayer();
     
        mMediaPlayer=MediaPlayer.create(this,R.raw.movie);  
  try {
    mMediaPlayer.setDisplay(sh);
    mMediaPlayer.prepare();
   } catch (IllegalStateException e) {
    e.printStackTrace();
   } catch (IOException e) {
    e.printStackTrace();
   }
   mMediaPlayer.start();
 

    }

현재 소스를 돌리면 화면은 나오지 않고 소리만 나오게 되는데 어떻게 하면 화면이 나오게 될까요?