http://blog.csdn.net/fuchaosz/article/details/51852442
Android静默安装实现方案,仿360手机助手秒装和智能安装功能
http://blog.csdn.net/guolin_blog/article/details/47803149
5.0以上 静默安装的安装包放在根目录下,如:Environment.getRootDirectory().toString()+"/xxx.apk";
源码:http://download.csdn.net/detail/u010873199/9635149