At what point is the screen to be displayed in the application stack?

Question

Android

When switching to another application, the application is closed by a code. I brought out the pin input fragment in onPause, it is clear that when switching it is displayed, but for some reason the working fragment of the application remains in the application list, which should not be visible.
Can you advise?

Answer 1

Set FLAG_SECURE for the activity.

getWindow().setFlags(LayoutParams.FLAG_SECURE,
                LayoutParams.FLAG_SECURE);