I need an App where a single screen should serve my all the purpose.
This App needs to show a custom screen popup while a Call is incoming, outgoing or Ongoing on Android phone.
This custom popup must cover the entire screen, when any call is incoming, outgoing or ongoing only.
Call Receiving/Answering, Rejecting, dropping will be possible using this app only.
If the User Presses Home, Back or any the system key - this screen must not be disappeared.
This app should work on any android device without rooting.
I need the source code and compiled app both.