android 怎么播放rtsp流

package com.video.rtsp;

import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.VideoView;

public class rtspActivity extends Activity {
/** Called when the activity is first created. */

Button playButton ;
VideoView videoView ;
EditText rtspUrl ;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

rtspUrl = (EditText)this.findViewById(R.id.url);
playButton = (Button)this.findViewById(R.id.start_play);
playButton.setOnClickListener(new Button.OnClickListener(){
public void onClick(View v) {
PlayRtspStream(rtspUrl.getEditableText().toString());
}
});

videoView = (VideoView)this.findViewById(R.id.rtsp_player);

}

//play rtsp stream
private void PlayRtspStream(String rtspUrl){
videoView.setVideoURI(Uri.parse(rtspUrl));
videoView.requestFocus();
videoView.start();
}

}