该源码实现了分屏效果，就是一个界面分割为9屏，这里采用9个按钮来充满屏幕，同时采用消息传递的方式实现单个屏幕的全屏与还原。-The source code to achieve the split-screen effect, is divided into a 9-screen interface, where the use of nine buttons to full screen while using messaging to achieve a single screen full