how to customize the system back button inside fragment about fragmentstack HOT 2 CLOSED

Hello, thank you for your attention, because you need to listen to the return key to recover the page, so provides an interface keyBack, you can use it
SetKeyCallBack (KeyCallBack new) {
@OverRide
Boolean onKeyDown public (keyCode int, event KeyEvent) {
False return;
}
});

from fragmentstack.

Thank you for your response just if possible can you elaborate the interface for how to implement it. As i am creating root activity from that opening a fragment and from that fragment opening new fragment and as on system backpressed i m returning to previous fragment and again on back pressed i want to display a dialog. In short i want to display over last fragment when user press system back button

from fragmentstack.