1.不要在UI线程里调用getReadableDatabase ()或者getWritableDatabase ()方法

参见androidAPI文档如下：

Create a helper object to create, open, and/or manage a database. This method always returns very quickly. The database is not actually created or opened until one of getWritableDatabase() or getReadableDatabase() is called.

LikegetWritableDatabase(), this method may take a long time to return, so you should not call it from the application main thread, including fromContentProvider.onCreate().

Database upgrade may take a long time, you should not call this method from the application main thread, including fromContentProvider.onCreate().

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