android 实现圆形菜单

private void computeCoordinates() {  BigStone stone;  BigStone menus;  for (int index = 0; index < STONE_COUNT; index ) {   stone = mStones[index];   stone.x = mPointX      (float) (mRadius * Math.cos(stone.angle * Math.PI / 180));   stone.y = mPointY      (float) (mRadius * Math.sin(stone.angle * Math.PI / 180));  }  if (flag == 0) {   for (int i = 0; i < MENUS; i ) {     menus = mMenus[i];     switch (i) {    case 0:     menus.x = 300 * 1.8f;     menus.y = 50;     break;    case 1:     menus.x = 300 * 1.8f 100;     menus.y = 50;     break;    case 2:     menus.x = 300 * 1.8f 200;     menus.y = 50;     break;    case 3:     menus.x = 300 * 1.8f;     menus.y = 150;     break;    case 4:     menus.x = 300 * 1.8f 10 100;     menus.y = 250;     break;     }    }  } }