how to finish all activities and close the application in android?

Question

My application has the following flow:

Home->screen 1->screen 2->screen 3->screen 4->screen 5>Home->screen 2->Home->Screen 3

My problem is that when I am try

Answer 1

There is finishAffinity() method that will finish the current activity and all parent activities, but it works only in Android 4.1 or higher.