code: public void setShowProgressBackground(boolean show) {
          Drawable drawable = getCurrentDrawable();
          if (drawable instanceof ShowBackgroundDrawable) {
              ((ShowBackgroundDrawable) drawable).setShowBackground(show);
          }
          Drawable indeterminateDrawable = getIndeterminateDrawable();
          if (indeterminateDrawable instanceof ShowBackgroundDrawable) {
              ((ShowBackgroundDrawable) indeterminateDrawable).setShowBackground(show);
          }
      }
docs: Set whether the current drawable should show a background. The default is {@code true}.
  
  @param show Whether background should be shown, or ignored if the progress drawable does not
  implement {@link ShowBackgroundDrawable}.