How To Switch To Active Call Screen

When a call is answered, you go to the active call screen (it has buttons to End the call, display the Dialpad, Mute the call etc) Let's say the user navigates to my app while a ca

Solution 1:

If your application is on top of the in call app in the Activity stack you should be able to call finish() on your own Activity which will leave the in call app on the top of the stack again, and thus it will be what is shown on the screen.

Also fwiw, I am not certain you need to provide the user with a way to get back within your Activity. They should be able to pull down the notification bar and click the "In Call" entry that gets placed in there to get back.

Solution 2:

I found a solution for Android O, at least. Simple intent to ACTION_CALL_BUTTON makes the work:

IntentcallIntent=newIntent(Intent.ACTION_CALL_BUTTON);
  startActivity(callIntent);