code: public static int getButtonBackgroundResource(@Style.Frame int frame) {
          switch (frame) {
              case Style.FRAME_LOLLIPOP: return R.drawable.selector_button_lollipop;
              case Style.FRAME_KITKAT: return R.drawable.selector_button_kitkat;
              case Style.FRAME_STANDARD: return R.drawable.selector_button_standard;
              default: return R.drawable.selector_button_standard;
          }
      }
docs: Returns a background resource for the Button in a
  {@link com.github.johnpersano.supertoasts.library.SuperActivityToast}.
  This Button resource will correspond to the corner radii of the
  {@link Style.Frame}.
  
  @param frame The current {@link Style.Frame}
  @return The corresponding Drawable reference