android平台上一个通过遮罩来自动显示一个异形图片的示例，可以能容易的生成圆形的头像-android platform, one through the mask to automatically display a picture of the sample profiled, may be able to easily generate a circular Avatar

一个简单的调用相机的程序，屏幕中间矩形框选景（周围遮罩），通过Thread画一条扫描绿线（动画）(A simple call camera program, the middle of the screen rectangle election scene (around the mask), by Thread draws a green line scan (animation))