How will I permanently exit my Android app using onBackPressed from my last Activity

Question

I have 8 Activities in my Android app and I want:

1)Every time I press Back button during my first 7 Activities to go back to my previous Activity(Act1< Act2< Act3< Act4< Act5< Act6< Act7) BUT

2)ONLY when I am in the 8th Activity I want to definitely exit my Android app and go to my phone's Home Screen.I try to do it by overriding onBackPressed method in my 8th Activity (Phone Home Screen<-Act8)

I found an Android implementation in which I insert finish();in every intent of all my 8 Activities but this is not what I want since this way I can't go back to the previous Activity whenever I want(with finish(); every current Activity is removed from back stack).

How will I do it please?

My code so far in my 8th Activity is:

            @Override
            public void onBackPressed()
            {

                   Intent intent = new Intent(Intent.ACTION_MAIN);
                   intent.addCategory(Intent.CATEGORY_HOME);
                   intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                   startActivity(intent);
                   finish();

            }

Answer 1

Another way: create a 9th Activity and call it FinishAllActivity or something like that. Make this activity call finish() and then return in its onCreate().

In onBackPressed() in Activity 8, start FinishAllActivity using the FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TASK flags (see this question for more details). Activities 1-8 will be removed from the stack, then the 9th Activity will start and immediately terminate and your task stack is clear. When you reopen the app it should start from Activity 1.

The advantage of doing it this way is that you don't have to modify Activities 1-7.