有时候很小的一个马虎，就会导致很多错误。近来在做项目的时候，遇到如下异常：
java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.java
阅读背景：
Android SQLite 数据库 java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow异常
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