docs: public double getLongitudeSpan() {
          if (this.mapView.getWidth() > 0 && this.mapView.getHeight() > 0) {
              LatLong left = fromPixels(0, 0);
              LatLong right = fromPixels(this.mapView.getWidth(), 0);
              return Math.abs(left.longitude - right.longitude);
          }
          throw new IllegalStateException(INVALID_MAP_VIEW_DIMENSIONS);
      }