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.
? ??Like?getWritableDatabase(), this method may take a long time to return, so you should not call it from the application main thread, including from?ContentProvider.onCreate().
? ? ?Database upgrade may take a long time, you should not call this method from the application main thread, including from?ContentProvider.onCreate().
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