android的图片资源默认是静态的，单实例；如果两个IM好友的头像一样，最简单的都是用的软件自带头像，有一个在线，一个离线，直接改变头像的灰度，则两个用户的头像都会变灰或者在线，-The picture of the android resource default is static, single instance.If two IM his best friend s face, the simplest is done with software own avatar, has an