I have and idea for an app that can answer this question.

While you're cooking you can ask the app to remind you to get some milk next time you go to the store. Or oranges or anything else you need - and it will remember that you need those things. When you happens to be within a half mile of a grocery store it will remind you of everything you need at the grocery store.<br><br>This way you don't need to carry around a piece of paper or remember that you need to write that milk is on your list. You only need to remember to ask the app at the time you think of it, which is usually just as you realize that you need it. <br><br>Alternatively, you could share the list with your housemates or family so that you can all ask the app to remind you. This way you can make sure that one of you will get the milk if one of you is going to the store. <br><br>My question is: does an app like this already exist for Android?