https://github.com/SkillCollege/QrCodeScan
http://www.eoeandroid.com/forum.php?mod=viewthread&tid=332855&highlight=%E4%BA%8C%E7%BB%B4%E7%A0%81
http://www.eoeandroid.com/space-uid-755483.html
zxing demo
原文：http://www.cnblogs.com/guduey/p/4427888.html
