Replace default Screen of android incoming and outgoing calls

Question

I am working on android. when a calls comes in, I want to replace the default android call screen with a new screen that has answer and deny call options. How can I do that? Need some help. Any help appreciated.

Do I have to use a toast message for this?

I do have the incoming and outgoing classes.

Answer 1

As far as my understanding goes it is not possible to replace the call screen with an App that is installed over the Marketplace.

To do this you would at least require root permissions. Maybe you also need to reconfigure the Android Version installed on the phone.