android使用surfaceview＋MediaPlayer播放视频

SurfaceHolder.Callback {
    @Override
    public void surfaceCreated(SurfaceHolder holder) {
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
    }
}

@Override
    public void surfaceCreated(SurfaceHolder holder) {
      player.setDisplay(holder);
    }

public class VideoActivity extends Activity {
  private SurfaceView surfaceView;
  private MediaPlayer player;
  private SurfaceHolder holder;
  private ProgressBar progressBar;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.surfaceview_item);
    surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
    progressBar= (ProgressBar) findViewById(R.id.progressBar);
   //视频链接可能已失效 
   String uri="http://video.dispatch.tc.qq.com/77613075/x0021o8d3g3.mp4?sdtfrom=v1001&type=mp4&vkey=23289E4B8D0F4B6CF18703222DFD0038845D8F56A75EEC20D5D4FDE678093D9AB211EFD7F4C99E5A612A96A04F46CEEB483628CFFBEA493D3AADBFCB81A540F7A92193874192FA0F70D1099DF330B2B419D45736554CB9BB3435019C985F530C5960E4B20FEBD5FAED17DC9F1FCE1C73&platform=10902&fmt=auto&sp=350&guid=1175defd049d3301e047ce50d93e9c7a";

    player=new MediaPlayer();
    try {
      player.setDataSource(this, Uri.parse(uri));
      holder=surfaceView.getHolder();
      holder.addCallback(new MyCallBack());
      player.prepare();
      player.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
        @Override
        public void onPrepared(MediaPlayer mp) {
          progressBar.setVisibility(View.INVISIBLE);
          player.start();
          player.setLooping(true);
        }
      });
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

  private class MyCallBack implements SurfaceHolder.Callback {
    @Override
    public void surfaceCreated(SurfaceHolder holder) {
      player.setDisplay(holder);
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {

    }
  }
}

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
  <SurfaceView
    android:id="@+id/surfaceView"
    android:layout_width="match_parent"
    android:layout_height="400dp" />
  <ProgressBar
    android:id="@+id/progressBar"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center" />
  <TextView
    android:id="@+id/numText"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:padding="3dp"
    android:layout_gravity="bottom|left"
    android:text="1"
    android:textSize="30dp"
    android:textColor="#f00"/>
</FrameLayout>