Android Intent to Foreground - ACTION_PHONE_STATE_CHANGED

I need a small piece of code -- a working "proof-of-concept". This code must be an Android application, installable on a standard G1, that does the following: - Receive the system intent? android.telephony.TelephonyManager.ACTION_PHONE_STATE_CHANGED - When ? the intent has extra state of "RINGING" bring a View to the foreground which displays "hello world". - This View should come up while the phone is ringing, and should cover the regular Android incoming call screen. - When the intent has any other state ("OFFLINE" or "IDLE") remove the View from the screen. ## Deliverables No more info. (The brief summary is really all that I need).