About owner drawn (custom widget)

I'm considering to develop owner drawn EditText widget. So, what do you think I should read or refer, fir开发者_高级运维stly? Or, could you give me some good examples of both owner drawn widget or custom widget?

To implement your own widgets you have to extend View or subclass of View. I think that a good start is Romain Guy presentation from Google IO:
http://www.youtube.com/watch?v=N6YdwzAvwOA