title: Map refresh problem mapview.invalidate() method is not working
body: <p>In my application I tried to search diff map location using diff lat and long. First time the application show the map but wen i change the lat long and try to invalidate the mapview using diff lat long, map is not refreshed. </p>
  
  <p>Below is my code please have a look and suggest accordingly:</p>
  
  <p>//Source code</p>
  
  <pre><code>protected void onCreate(Bundle icicle) {
          // TODO Auto-generated method stub
          super.onCreate(icicle);
          setContentView(R.layout.main);
          infoTextView = (TextView) findViewById(R.id.infoTextView);
  
          // Finding Current Location
      locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
      locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
                  1l, 1l, this);
      Location location = locationManager.getLastKnownLocation("gps");
  
  
      // mock location by hard-code if DDMS has not sent a fake loc to the emulator.
          if (location == null) {
              lat = 13.6972 * 1E6;
              lng = 100.5150 * 1E6;
      } else { // get real location if can retrieve the location sent by DDMS or GPS
              lat = location.getLatitude() * 1E6;
              lng = location.getLongitude() * 1E6;
          }
          setGPSLocation(lat, lng);
      }
  </code></pre>
  
  <p>//This is the function which I am calling with different lat and long</p>
  
  <pre><code>public void setGPSLocation(Double lati, Double longi)
      {
          lat = lati;
          lng = longi;
          System.out.println("Latitude :"+ lat +" Longitude :"+lng);
  
          // Prepare text being shown
          String tmpLoc = LOC_INFO_TEMPLATE;
          tmpLoc = tmpLoc.replace("lg", String.valueOf(lng));
          tmpLoc = tmpLoc.replace("lt", String.valueOf(lat));
          infoTextView.setText(tmpLoc);
  
          // Setup Zoom/Hide Buttons
          linearLayout = (LinearLayout) findViewById(R.id.zoomview);
          mapView = (MapView) findViewById(R.id.mapview);  
          mapView.invalidate();
  
          mapView.setBuiltInZoomControls(true);                           //new by me
          mapView.setSatellite(true); // Set satellite view
          mZoom = (ZoomControls) mapView.getZoomControls();
          linearLayout.addView(mZoom);
  
          // Setup Marker
  
          mapOverlays = mapView.getOverlays();
          drawable = this.getResources().getDrawable(R.drawable.marker);
          itemizedOverlay = new MyItemizedOverlay(drawable);
          GeoPoint point = new GeoPoint(lat.intValue(), lng.intValue());
          OverlayItem overlayitem = new OverlayItem(point, "", "");
          itemizedOverlay.addOverlay(overlayitem);
          mapOverlays.add(itemizedOverlay);
  
          // Centralize Current Location
          myMapController = mapView.getController();
          myMapController.setZoom(DEFAULT_ZOOM_NUM);
          myMapController.animateTo(point);   
  
  
  
      }
  </code></pre>
  
  <p>Any suggest is truly appreciable.</p>