code: public Drawable into(final GridPagerAdapter adapter, final int row) {
          final String path = mPath;
          final Transformation transformation = mTransformation;
  
          final Drawable drawable = returnDrawableIfAvailable(path, transformation);
          if (drawable != null)
              return drawable;
          else {
              into(new BitmapCallBack(adapter) {
                  @Override
                  public void onBitmapLoaded(String path, Bitmap bitmap) {
                      if (adapter != null)
                          adapter.notifyRowBackgroundChanged(row);
                  }
              });
          }
  
          this.resetParameters();
  
          return mPlaceHolder;
      }
docs: Load the bitmap into a GridPagerAdapter ar row [row]