code: public static void load(String imageUrl, ImageLoaderHandler handler, Drawable dummyDrawable,
                              Drawable errorDrawable) {
          load(imageUrl, handler.getImageView(), handler, dummyDrawable, errorDrawable);
      }
docs: Triggers the image loader for the given image and handler. The image loading will be
  performed concurrently to the UI main thread, using a fixed size thread pool. The loaded
  image will not be automatically posted to an ImageView; instead, you can pass a custom
  {@link ImageLoaderHandler} and handle the loaded image yourself (e.g. cache it for later
  use).
  
  @param imageUrl      the URL of the image to download
  @param handler       the handler which is used to handle the downloaded image
  @param dummyDrawable the Drawable set to the ImageView while waiting for the image to be downloaded
  @param errorDrawable the Drawable set to the ImageView if a download error occurs