Android单点触控技术,对图片进行平移,缩放,旋转操作 类似百度魔图,实现点击图片右上角按钮可以旋转,单击图片拖动 的功能-Android single touch technology, the image pan, zoom, rotate operation similar to Baidu magic map, click on the image to achieve the upper right corner button to rotate, click on the pic