Android clear backstack when leaving item tab BottomNavigation

Question

I am using the last navigation library (version 2.4.0) which include multiple backstacks with a bottom navigation view.

The default behavior is that each backstack is saved when user go back to a tab. I want to clear a backstack when the user leave a tab.

Based on this bottom nav with 3 tabs :

Tab1	Tab2	Tab3
ScreenA1	ScreenB1	ScreenC1
ScreenA2	ScreenB2	ScreenC2

From Tab1, if user:

• go to ScreenA2
• clic on Tab2 (ScreenB1 displayed)
• go back to Tab1
• here I want ScreenA1 and not ScreenA2 (default behavior of navigation library)

Thanks

Answer 1

You can turn off multiple backstacks for tabs, as it was before lib version 2.4. For this you should change

navView.setupWithNavController(navController) 

to

NavigationUI.setupWithNavController(navView, navController, false)