docs: public CacheManagerTask downloadAreaAsync(Context ctx, ArrayList<GeoPoint> geoPoints, final int zoomMin, final int zoomMax, final CacheManagerCallback callback) {
          final CacheManagerTask task = new CacheManagerTask(this, getDownloadingAction(), geoPoints, zoomMin, zoomMax);
          task.addCallback(callback);
          task.addCallback(getDownloadingDialog(ctx, task));
          return execute(task);
      }