[android-developers] Auto refresh data from webserver to activity

Hello.I want to make an application for get web data every x secs i try this code but no work...where is the mistake?Thanks. public class ReadWebpageAsyncTask extends Activity { private TextView textView; private final Handler handler = new Handler(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_read_webpage_async_task); textView = (TextView) findViewById(R.id.textView1); } private class DownloadWebPageTask extends AsyncTask<String, Void, String> { @Override protected String doInBackground(String... urls) { String response = ""; ................. } catch (Exception e) { e.printStackTrace(); } } return response; } @Override protected void onPostExecute(String result) { textView.setText(result); } } public void readWebpage(View view) { DownloadWebPageTask task = new DownloadWebPageTask(); task.execute(new String[] { "http://www.mysite.net/LEDstate.txt" }); } private final Runnable refreshRunnable = new Runnable() { public void run() { DownloadWebPageTask task = new DownloadWebPageTask(); task.execute(new String[] { "http://www.mysite.net/LEDstate.txt" }); //new RefreshTask(param1, param2).execute(); long TIME_DELAY= 3000; handler.postDelayed(refreshRunnable, TIME_DELAY); } };    In main activity i have one text and two buttons the first button on click call readwebpage and work and the second button call refreshRunable and no work...

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