android4.0源码下载git安装：yum install git-corejdk安装：http://evan-shen.iteye.com/blog/1335685http:/
android4.0源码下载
git安装：yum install git-core
jdk安装：http://evan-shen.iteye.com/blog/1335685
http://blog.csdn.net/mobilechan/article/details/7466030
1. repo forall -c git checkout -f
2. repo sync -f