How to develop a android unlock screen app

Question

I am student and I want to develop a android unlock screen app. I want to know what android api can give me some helps and how can I set my app as the default unlock screen

Answer 1

I know this question is old. But just to help anyone seeing this post aand getting disheartened, I've found an answer on a comparable question on stackoverflow link, it might help now. There is also a new feature named DayDream in the API 4.2 this could be also interesting. It's a feature.

Hope it helps someone. Cheers :)