
![image](https://user-images.githubusercontent.com/12162539/50417924-d6cc2b80-0863-11e9-860f-bf9d132db570.png)

private int borders = BORDER_OUTER | BORDER_INNER;
        /**
         * border outer top
         */
        public static final int BORDER_OUTER_TOP = 1 << 0;
        /**
         * border outer right
         */
        public static final int BORDER_OUTER_RIGHT = 1 << 1;
        /**
         * border outer bottom
         */