docs: 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);
          }
      }