Android 解决attempt to acquire a reference on a close SQLiteClosable
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1、最基本的可能是操作不当，访问已经关闭的数据库，这中原因检查一下代码就能解决。
2、使用完Cursor后没有关闭。Cursor一定要使用完立刻关闭（我的就是这问题，项目前期就发现了当时没怎么在意，后来就只能加班改代码了）。
3、还有国外的朋友认为可能是Android会不定时的吧旧对象回收掉，每次操作数据库应该用新对象，而不要用就对象了（E文不好不知道对不对）。
http://stackoverflow.com/questions/1483629/exception-attempt-to-acquire-a-reference-on-a-close-sqliteclosable
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