Change project's target Android version to Android 4.4 (API 19)
ItemDescriptionEntryActivity: Declare some local variables as final to reduce their mutability
Make class ItemsDbHelper final
ItemsDbHelper: Make field COL_ID private since it's not used outside the class
ItemsDbHelper: Make field COL_STATUS private since it's not used outside the class
ItemsDbHelper: Move String containing database creation command inside the DbHelper.onCreate() method, since it's only used there
In ItemsDbHelper, add a new method isItemChecked(), that returns true if an item is checked, and false otherwise. Update code in ChecklistActivity to use this method instead of getItemStatus()