自制的图片查看器，可根据图片的横纵比例显示图片，将图片按照当前可用空间放入，就像一个图片墙，所有人都把照片放在可以放下的空白地方，当然是自上而下、自左至右。-Homemade picture viewer, according to the aspect ratio of the picture display pictures, the pictures into in accordance with the currently available space, like a picture