DatePicker does not work when trying to use it [duplicate]

Answer 1

(As answered in this similar question)

You should change the api eclipse uses to graphically display your layout. You do this in the graphic view, in the top right, with the button that has the android logo. API 16 might give some problems, so try switching to 15 or 14 instead. (It will take a bit of time to load and refresh)

Answer 2

I see what you are talking about in the Graphical Layout, but this won't affect your app. This error simply means Eclipse cannot build a preview of DatePicker for your layout. I bet if you run your app it will display just fine.