code: public boolean getShowProgressBackground() {
          Drawable drawable = getCurrentDrawable();
          if (drawable instanceof ShowBackgroundDrawable) {
              return ((ShowBackgroundDrawable) drawable).getShowBackground();
          } else {
              return false;
          }
      }
docs: Get whether the current drawable is showing a background. The default is {@code true}.
  
  @return Whether the current drawable is showing a background, or {@code false} if the
  drawable does not implement {@link ShowBackgroundDrawable}.