title: How to refresh an activity? Map View refresh fails
body: <p>After implementing some Android Apps, including several Map activities, I try to refresh the activity when the GPS listener's onLocationChanged() method is called.</p>
  
  <p>I have no idea how to tell the map activity to refresh on its own and display the new coords...</p>
  
  <p>The coords to store will have to be in global values, so that the location listener will have access to it.</p>
  
  <p>In my sample GPS-class (see code below) I just changed the text of a text view....but how to do that in map view?</p>
  
  <pre><code>private class MyLocationListener implements LocationListener {
      @Override
      public void onLocationChanged(Location loc) {
          final TextView tv = (TextView) findViewById(R.id.myTextView);
          if (loc != null) {
              tv.setText("Location changed : Lat: " + loc.getLatitude()
                              + " Lng: " + loc.getLongitude());
          }
      }
  </code></pre>
  
  <p>I think the solution of this Problem won't be very difficult, but I just need the beginning ;-)</p>
  
  <p>This whole app shall work like a really simple navigation system.</p>
  
  <p>It would be great if someone could help me a little bit further :)</p>