Application should not display in recent app list after finish the activity if app was not displaying recent app list previously

Question

Step 1- Application is not exist in recent app list (App has been removed from recent app list).
Step 2- As soon as I got notification open IncomingCall activity, User a

Answer 1

As per you needs, finishAndRemoveTask() is the new API that as per the documentation

Finishes all activities in this task and removes it from the recent tasks list.

if(android.os.Build.VERSION.SDK_INT >= 21)
{
    finishAndRemoveTask();
}
else
{
    finish();
}