Android Modifying in-call screen via AOSP

Question

I've read elsewhere that “Developers cant customize the in-call screen because of security concerns”

So, I am trying to understand the functionality of the in-call screen at the source level.

Can any Android devs, especially those that have created their own custom ROMs, tell me which specific classes in the AOSP are responsible for both display and functionality of this screen?

Answer 1

Take a look at the source:(from the horse's mouth):
https://code.google.com/p/incomingcallplus/source/checkout
Esp. the BETA Version 0.8.0

By the way, if you are interested in some R&D, I have worked towards this so i know we can access PhoneStateListener and get the status of a call for off the hook, idle and ringing. http://www.tutorialforandroid.com/2009/01/get-phone-state-when-someone-is-calling_22.html

Also, Android: How to customize income call screen