how can you play vedio

PalyTestActivity.class is the main activity class
=================================
import java.io.IOException;
import android.app.Activity;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class PalyTestActivity extends Activity implements SurfaceHolder.Callback
{
Button btStop;
private MediaPlayer mediaPlayer;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
     
        btStop=(Button)findViewById(R.id.stop);
     
        mediaPlayer = new MediaPlayer();
        SurfaceView surface = (SurfaceView)findViewById(R.id.surface);
        SurfaceHolder holder = surface.getHolder();
        holder.addCallback(this);
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        holder.setFixedSize(400, 300);
     
     
     
        btStop.setOnClickListener(new OnClickListener()
        {
@Override
public void onClick(View v)
{
   callstop();
}
});
     
     
     
 
     
     
     
    }

private void callstop()
{

mediaPlayer.stop();
}

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

}

@Override
public void surfaceCreated(SurfaceHolder holder)
{
/*try {
mediaPlayer.setDisplay(holder);
} catch (IllegalArgumentException e) {
Log.d("MEDIA_PLAYER", e.getMessage());
} catch (IllegalStateException e) {
Log.d("MEDIA_PLAYER", e.getMessage());
}*/
try {
mediaPlayer.setDisplay(holder);
// if want to play from sd card you can use this code
/ /mediaPlayer.setDataSource("/sdcard/test2.3gp");
Uri myuri = Uri.parse("android.resource://" + getPackageName() + "/"  + R.raw.yourvideofile);
             //make a folder in res which name is raw and put video files //



mediaPlayer.setDataSource(PalyTestActivity.this, myuri);
mediaPlayer.prepare();
mediaPlayer.setVolume(1f, 0.5f);

       mediaPlayer.setScreenOnWhilePlaying(true);
mediaPlayer.start();
int pos = mediaPlayer.getCurrentPosition();
int duration = mediaPlayer.getDuration();

}
catch (IllegalArgumentException e)
{
Log.d("MEDIA_PLAYER", e.getMessage());
}
catch (IllegalStateException e)
{
Log.d("MEDIA_PLAYER", e.getMessage());
}
catch (IOException e)
{
Log.d("MEDIA_PLAYER", e.getMessage());
}

}


@Override
public void surfaceDestroyed(SurfaceHolder holder)
{
mediaPlayer.release();

}
}

=========================================
                                     Main.xml
======================================

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <Button
            android:id="@+id/stop"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="stop" />




        <SurfaceView
            android:id="@+id/surface"
            android:layout_width="fill_parent"
            android:layout_height="209dp" />

    </LinearLayout>

=================================================
//////////////////////////////////////manifest.xml///////////////////////////////////////////
=================================================


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.myandroid.play"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="7" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".PalyTestActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>