code: public void setCornerSize(@CornerSide int side, int size) {
          switch (side) {
              case SIDE_LEFT_TOP:
                  leftt = size;
                  break;
              case SIDE_LEFT_BOTTOM:
                  leftb = size;
                  break;
              case SIDE_RIGHT_BOTTOM:
                  rightb = size;
                  break;
              case SIDE_RIGHT_TOP:
                  rightt = size;
                  break;
          }
          init();
      }
docs: 设置边角尺寸