http://weishu.me/2017/11/23/dexposed-on-art/
https://mp.weixin.qq.com/s?__biz=MzAwNDY1ODY2OQ==&mid=2649286633&idx=1&sn=e86674ae64ee0082dabb47e1f858f703&chksm=8334c36bb4434a7d2bc7e6d590a61d610161bc33eda35dcab5d56d38c78422dcfe1bbe32533a&mpshare=1&scene=1&srcid=0308cdAsMm77bckMhXNE6dZh#rd
https://stackoverflow.com/questions/10210503/database-disk-image-is-malformed-or-file-is-encrypted-or-is-not-a-database
http://blog.csdn.net/sangyongjia/article/details/54910104
