android - rstp と vnd.youtube:// で再生する Android youtube ビデオ

Question

//このメソッドは、YouTube の読み込みを表示するだけです

1. Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("vnd.youtube://" + videoId)) startActivity(intent);

//2 番目のメソッドはビデオをまったく再生していません 2 .

public class MyTask extends AsyncTask<Void, Void, Void>
    {

    @Override
    protected void onPreExecute() {
        // TODO Auto-generated method stub
        super.onPreExecute();
        mProgressBar.setVisibility(LinearLayout.VISIBLE);

    }

    @Override
    protected Void doInBackground(Void... params) {
        // TODO Auto-generated method stub
        url=getUrlVideoRTSP(urlRstp[0]);
        rstlUrl=Uri.parse(url);

        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        // TODO Auto-generated method stub
        super.onPostExecute(result);
        //Toast.makeText(VODVideoPlayActivity.this, url, Toast.LENGTH_LONG).show();
        //System.out.println(url);

        mVideoView.setVideoURI(rstlUrl);
        //MediaController mc = new MediaController(VODVideoPlayActivity.this);
        //mVideoView.setMediaController(mc);
        //mVideoView.requestFocus();
        mVideoView.start();          
        //mc.show();
        mProgressBar.setVisibility(LinearLayout.GONE);          
    }




}

public static String getUrlVideoRTSP(String urlYoutube)
{
    try
    {
        String gdy = "http://gdata.youtube.com/feeds/api/videos/";
        DocumentBuilder documentBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
        String id = extractYoutubeId(urlYoutube);
        URL url = new URL(gdy + id);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        Document doc = documentBuilder.parse(connection.getInputStream());
        Element el = doc.getDocumentElement();
        NodeList list = el.getElementsByTagName("media:content");///media:content
        String cursor = urlYoutube;
        for (int i = 0; i < list.getLength(); i++)
        {
            Node node = list.item(i);
            if (node != null)
            {
                NamedNodeMap nodeMap = node.getAttributes();
                HashMap<String, String> maps = new HashMap<String, String>();
                for (int j = 0; j < nodeMap.getLength(); j++)
                {
                    Attr att = (Attr) nodeMap.item(j);
                    maps.put(att.getName(), att.getValue());
                }
                if (maps.containsKey("yt:format"))
                {
                    String f = maps.get("yt:format");
                    if (maps.containsKey("url"))
                    {
                        cursor = maps.get("url");
                    }
                    if (f.equals("1"))
                        return cursor;
                }
            }
        }
        return cursor;
    }
    catch (Exception ex)
    {
        Log.e("Get Url Video RTSP Exception======>>", ex.toString());
    }
    return urlYoutube;

}

protected static String extractYoutubeId(String url) throws MalformedURLException