android java.lang.IllegalStateException: trying to requery an already closed cursor
錯誤提示：
Java.lang.RuntimeException: Unable to resume activity {com.lenovo.leos.memowidget/com.lenovo.leos.notepad.NoteEditor}: java.lang.IllegalStateException: trying to requery an already closed cursor
可能錯誤的使用方法：
query(android.net.Uri, String[], String, String[], String)
startManagingCursor(Cursor)
由activity在通過query獲取了Cursor之後用startManagingCursor來管理Cursor的生命週期的，那麼每一次呼叫完畢之後Cursor也會相應的被關閉；由此從history menu tab進入的時候則可能因為Cursor被關閉了而導致異常。
解決辦法：
不使用startManagingCursor(Cursor)來管理Cursor的生命週期，自己使用.close()管理。
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