本项目受Google官方demo Zooming a View 启发，实现了点击小图放大至全屏预览，退出全屏恢复至原来位置这两个过程的动画过渡。 常见应用场景如微信朋友圈照片九宫格和微信聊天图片预览，某些手机系统相册等viewpager图片查看 缩放 拖拽下拉缩小退出（效果同微信图片浏览）
The project by the Google official demo Zooming a View inspired to achieve a click on the thumbnail zoom to full screen preview, exit the full screen to restore the original location of the two processes of the animation transition. Common application scenes such as WeChat friends circle photo Jiugongge and WeChat chat picture preview, some mobile phone system album, etc. viewpager picture zoom zoom pull down to pull out (effect with micro letter picture browsing