I want to create an android app that serves as a 'to do' list.

• It should be suitable for keeping shopping lists and also general 'to do' lists.
• It should be easily accessible from the home screen, perhaps by a widget.
• Make use of previous entries e.g. previous items on a shopping list

Rather than each list being a simple block of editable text, it would appear a database driven solution would fit better as that would support moving items more readily.

There would need to be a main interface, which lists all the current lists, and allows new ones to be created.

Selecting an existing list from this main page could bring up a screen showing all the items on that list, and allow items to be added / edited / deleted.

For now this would be enough. The app could be extended by allowing times to be set for items, or other information to be recorded, such as the price for items purchased, or time spent for tasks completed. It could even record the location, which could perhaps provide a way to find e.g. the cheapest place to go for certain items.