docs: public void setDropShadowColor(int color) {
          GradientDrawable.Orientation orientation = getDropShadowOrientation();
  
          final int endColor = color & 0x00FFFFFF;
          mDropShadowDrawable = new GradientDrawable(orientation,
                  new int[] {
                          color,
                          endColor,
                  });
          invalidate();
      }