(Android) How to catch a "ring" event?

I'm clearly a newb, and I was wondering if anyone knows how I can detect a "ring" event on my cellphone through the android sdk? Gen开发者_如何学Pythonerally I want to do something with the phone when it begins ringing! Any thoughts?

If you want to simply point me to a page in the api documents that would be a good answer for me, I just don't know how to start my research!

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Try this site here: http://mylifewithandroid.blogspot.com/2008/01/phonecalls.html