[android-developers] Overriding Android default (built-in) components

I want an activity in my app to overide the
Android default (built-in) phone dialer/receiver
that normally gets run on incoming calls.

This is so that I can replace the default screen that pops up when a
phone call comes in with my own call reception activity.

I have never overridden Android built-in components, and so I don't
know where to start looking.

Would someone please point me to information (links, books, code
examples, whatever), about how to override built-in Android apps? Any
starting point would be helpful.

Thanks,
Wolfgang
Santa Barbara, CA

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