Android SQLite:尝试重新打开一个已经关闭的对象

I'm trying to get certain book data from my Inventory table based on the ISBN. However, I'm getting an error: "attempt to re-open an already-closed object". The error only occurs when I click a listView object, go to a different screen, go back to this page via "finish()", and then try to click on another listView object. I moved the I'm trying to get certain book data from my Inv