code: public void setSlideDrawable(Drawable drawable) {
          mSlideDrawable = new SlideDrawable(drawable);
          mSlideDrawable.setIsRtl(ViewHelper.getLayoutDirection(this) == LAYOUT_DIRECTION_RTL);
  
          if (mActionBarHelper != null) {
              mActionBarHelper.setDisplayShowHomeAsUpEnabled(true);
  
              if (mDrawerIndicatorEnabled) {
                  mActionBarHelper.setActionBarUpIndicator(mSlideDrawable,
                          isMenuVisible() ? mDrawerOpenContentDesc : mDrawerClosedContentDesc);
              }
          }
      }
docs: Sets the drawable used as the drawer indicator.
  
  @param drawable The drawable used as the drawer indicator.