Android : How to get the table values from the html page in android by jsoup

I want to extract values from table from this site from the below table as shown

i want all the content from the table to extracted.

Below is my android code.

public class MainActivity extends Activity {

    // URL Address

    String url = "http://results.vtu.ac.in/vitavi.php";
    ProgressDialog mProgressDialog;

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

        // Locate the Buttons in activity_main.xml

        Button descbutton = (Button) findViewById(R.id.descbutton);

        // Capture button click
        descbutton.setOnClickListener(new OnClickListener() {
            public void onClick(View arg0) {
                // Execute Description AsyncTask
                new Description().execute();
            }
        });


    }

    // Description AsyncTask
    private class Description extends AsyncTask<Void, Void, Void> {
        String desc;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            mProgressDialog = new ProgressDialog(MainActivity.this);
            mProgressDialog.setTitle("Android Basic JSoup Tutorial");
            mProgressDialog.setMessage("Loading...");
            mProgressDialog.setIndeterminate(false);
            mProgressDialog.show();
        }

        @Override
        protected Void doInBackground(Void... params) {
            try {
                // Connect to the web site
                Document document = Jsoup.connect(url).data("rid", "1rn12ec080")
                        .data("submit", "SUBMIT")
                        .userAgent("Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.101 Safari/537.36")
                        .post();



                Elements description = document
                        .select("meta[name=description]");

                // Locate the content attribute
                desc = description.attr("content");
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            // Set description into TextView
            TextView txtdesc = (TextView) findViewById(R.id.desctxt);
            txtdesc.setText(desc);
            mProgressDialog.dismiss();
        }
    }

However if i try to execute the code, it get a blank screen when i click on the descbutton.

Here is the network tab, it shows the vitavi.php where the rid(input) to be given.