android zxing

android入门：zxing学习笔记：http://www.cnblogs.com/liuan/category/347622.html

扫描框框改进：http://www.cnblogs.com/forrestsun/archive/2012/11/06/2757005.html

ZXing android 源码简化：http://www.cnblogs.com/keyindex/archive/2011/06/08/2074900.html