Get video width and height of MediaPlayer and update SurfaceView LayoutParams accordingly

package com.example.androidyoutubeplayer;

import java.io.IOException;

import android.graphics.PixelFormat;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnVideoSizeChangedListener;
import android.os.Bundle;
import android.app.Activity;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends Activity implements SurfaceHolder.Callback{
 
 MediaPlayer myMediaPlayer;
 SurfaceView mySurfaceView;
 SurfaceHolder mySurfaceHolder;
 
 Button btnPlay, btnStop;
 TextView textVideoSize;
 String path3gp = "rtsp://v8.cache6.c.youtube.com/CjYLENy73wIaLQkP0kiLmutogRMYDSANFEIJbXYtZ29vZ2xlSARSBXdhdGNoYKjR78WV1ZH5Tgw=/0/0/0/video.3gp";
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        getWindow().setFormat(PixelFormat.UNKNOWN);
        mySurfaceView = (SurfaceView)findViewById(R.id.mediasurface);        
        mySurfaceHolder = mySurfaceView.getHolder();
        mySurfaceHolder.addCallback(this);
        myMediaPlayer = new MediaPlayer();
        
        btnPlay = (Button)findViewById(R.id.play);
        btnStop = (Button)findViewById(R.id.stop);
        
        btnPlay.setOnClickListener(playOnClickListener);
        btnStop.setOnClickListener(stopOnClickListener);
        
        textVideoSize = (TextView)findViewById(R.id.size);

    }
    
    OnClickListener playOnClickListener
    = new OnClickListener(){

  @Override
  public void onClick(View v) {
   myMediaPlayer.reset();
   
   myMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
   myMediaPlayer.setDisplay(mySurfaceHolder);
   
   try {
    
    myMediaPlayer.setOnVideoSizeChangedListener(videoSizeChangedListener);
    
    myMediaPlayer.setDataSource(path3gp);
    myMediaPlayer.prepare();
    
    /*
     * if you get Video Width and Height after prepare() here, it always return 0, 0!
     */
    int videoWidth = myMediaPlayer.getVideoWidth();
    int videoHeight = myMediaPlayer.getVideoHeight();
    textVideoSize.setText(String.valueOf(videoWidth) + " x " + String.valueOf(videoHeight));
    
    myMediaPlayer.start();
   } catch (IllegalArgumentException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   } catch (SecurityException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   } catch (IllegalStateException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   
  }};
    
    OnClickListener stopOnClickListener
    = new OnClickListener(){

  @Override
  public void onClick(View v) {
   if(myMediaPlayer.isPlaying()){
    myMediaPlayer.stop(); 
   }
   
  }};

 @Override
 public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
  // TODO Auto-generated method stub
  
 }

 @Override
 public void surfaceCreated(SurfaceHolder holder) {
  // TODO Auto-generated method stub
  
 }

 @Override
 public void surfaceDestroyed(SurfaceHolder holder) {
  // TODO Auto-generated method stub
  
 }
 
 /*
  * Get Video Width and Height in OnVideoSizeChangedListener,
  * and update SurfaceView LayoutParams accordingly.
  */
 OnVideoSizeChangedListener videoSizeChangedListener
 = new OnVideoSizeChangedListener(){

  @Override
  public void onVideoSizeChanged(MediaPlayer arg0, int arg1, int arg2) {
   int videoWidth = myMediaPlayer.getVideoWidth();
   int videoHeight = myMediaPlayer.getVideoHeight();
   
   textVideoSize.setText(String.valueOf(videoWidth) + " x " + String.valueOf(videoHeight));
   
   mySurfaceView.setLayoutParams(
     new LinearLayout.LayoutParams(videoWidth, videoHeight));
  }};
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    
    <Button
        android:id="@+id/play"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="PLAY"/>
    <Button
        android:id="@+id/stop"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="STOP"/>
    <TextView
        android:id="@+id/size"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
    <SurfaceView
        android:id="@+id/mediasurface"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"/>

</LinearLayout>