编程方式实现屏幕的翻转,充分利用理解DEMODE-Programming screen flip to achieve full use of the understanding DEMODE

简化的照片查看器，能实现全屏浏览，照片旋转，上下翻页，简单实用。-Simplified photo viewer, can achieve full-screen browsing, picture rotation, flip up and down, simple and practical.