docs: private void reloadMarker(BoundingBox latLonArea, double zoom) {
          Log.d(TAG,"reloadMarker " + latLonArea + ", zoom " + zoom);
          this.mCurrentBackgroundMarkerLoaderTask = new BackgroundMarkerLoaderTask();
          this.mCurrentBackgroundMarkerLoaderTask.execute(
                  latLonArea.getLatSouth(), latLonArea.getLatNorth(),
                  latLonArea.getLonEast(), latLonArea.getLonWest(), zoom);
      }