How to manipulate current task's Activity back stack?

Question

Currently I have 3 Activity classes A, B and C.

Activity A is a singleTask while other has the default launch mode. Consider a case: the user is first in A, then starts B, and then starts C.

The back stack now is ABC.

Next, the user starts A again.

The back stack now is A, but what I would like to be achieved is ABCA.

I know not setting Activity A to be singleTask can have a back stack : ABCA. But I really need the Activity A to be the same instance.

Anyone know how to do this?

Answer 1

You have stipulated two conditions:

what I would like to be achieved is ABCA.

and

I really need the Activity A to be the same instance.

These two conditions are mutually contradictory. Absolutely.

What you want is impossible.

That is all.

Answer 2

That is not possible.

if you want to open existing activity then

launch your activity as

    Intent intent = new Intent(this, YourActivity.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
    startActivity(intent);

Answer 3

Are you sure you need singleTask and not singleTop ? Could you describe why do you need it singleTask ?