i just started with android and i'm working on a simple app that should download contents of a html file. I'm using AsyncTask as suggested, but i'm encountering one problem. In the following code (i followed a tutorial code), i get tv cannot be resolved for the onPostExecute method. How to access the downloaded file? Thank You:

public class FlashResults extends Activity {
  @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        TextView tv = new TextView(this);
        setContentView(tv);
        readWebpage(tv);                
  }


  protected class DownloadPage extends AsyncTask<String, Void, String> {
          protected String doInBackground(String... urls) {

          String responseStr = null;

          try {
              for (String url : urls) {   
              DefaultHttpClient httpClient = new DefaultHttpClient();
              HttpGet get = new HttpGet(url);
              HttpResponse httpResponse = httpClient.execute(get);
              HttpEntity httpEntity = httpResponse.getEntity();
              responseStr = EntityUtils.toString(httpEntity);
              } 
          } catch (UnsupportedEncodingException e) {

          } catch (ClientProtocolException e) {

          } catch (IOException e) {

          }
          return responseStr;
      }

      protected void onPostExecute(String result) {           
          tv.setText(result);
      }
  }

  public void readWebpage(View v) {
        DownloadPage task = new DownloadPage();
        task.execute(new String[] { "http://seznam.cz" });
      }

}