android活动永远在最前面

Question

There are 2 activities: A and B
if activity A is started then it will be always on top of activity B (if B exist)
if B is started and A is in foreground then B will go right under A
if A is going in background or is closed then(if B exist) B will be shown

each activity is running in its own task

In other words is there a simple way to start an activity right under the current activity so when that close then it will be shown

what is the simplest way to do this using manifest flags preferably

Answer 1

Start A inside new Task stack. Read docs for Intent .

Inside onCreate of A check Intent and open B.

Now you have new stack where B is above A, however and A and B were used before.