code: public void setCornerSize(@CornerSide int side, int size) {
          switch (side) {
              case ALL:
                  cornerSize = size;
                  break;
              case RIGHT_TOP:
                  cornerSizeRightTop = size;
                  break;
              case RIGHT_BOTTOM:
                  cornerSizeRightBottom = size;
                  break;
              case LEFT_BOTTOM:
                  cornerSizeLeftBottom = size;
                  break;
              case LEFT_TOP:
                  cornerSizeLeftTop = size;
                  break;
          }
          resetPadding();
          invalidate();
      }
docs: 设置指定的边角大小