How to disable back navigation after app reaches home page of the app in android?

Issue

I am using One Activity, many fragments in my android app.

I have One Main Activity with Navhost. And 3 Fragments. fragment1 as home fragment which is starting point of navigation. fragment1 navigates to fragment2, fragment 2 navigates to fragment3.

From fragment3, it navigates to home fragment i.e, fragment1.

After reaching from fragment 3 to fragment 1, if I back press in fragment1, it is again navigating to fragment3 instead of exiting the app.

How should I disable the back navigation from home fragment to fragment3.

I've used navController.navigate(navController.getGraph().getStartDestination()); in the fragment3. Not working.

Solution

I tried this and it worked.

navController.popBackStack(R.id.fragment2,true); navController.popBackStack(R.id.fragment3,true); navController.navigate(navController.getGraph().getStartDestination());

Answered By - Cnu Federer