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[newbie] - Doubt about design  RSS feed

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I have a doubt about how to design my first android application.

Basically, I have three different activities using a ListView with checkboxes, fecthing rows from a DB (so the adapters extend CursorAdapter).

I am using an application in order to store the user’s choiches (a couple of array), and some methods like addElement(), removeElement()...

I have a DBHelper with some methods like giveNameByID(), giveColorByID().....

Sometimes, mainly in the adapters, I need to interact with the Application AND with the DBHelper, so I declare as fields of the Adapter a DBHelper and an Application.

My question is:

Is it better to declare as field the DBHelper into the Application and make that the activitis/adpaters use only the Application or I can use Application an DBHelper everywhere?

I am asking this because sometimes I get some serious warning about non closing the DB!
In every activity I filled the methods OnPause(), OnDestroy() with a DBHelper.close(), but It seems it is not enough!


It is sorta covered in the JavaRanch Style Guide.
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