How to exit app on back press in a non start destination?

Question

Say I have a navigation graph similar to this:

---------      ---------
| Home  | ---->| Other |
---------      ---------
    |
    |
    V
---------
| Login |
---------

If the user isn't logged in, I've to show the login screen before he can proceed. As per the docs, I check whether the user is logged in or not in the HomeFragment. If he isn't, I open the LoginFragment. So far, so good.

But if the user presses back in the LoginFragment, I want the app to exit. But since LoginFragment isn't the start destination, it will simply open HomeFragment which will open LoginFragment again.

Currently, I quit the app by overriding onBackPressed() in the host Activity and finish() the Activity if the current destination is LoginFragment.

But this feels hackish. I guess this must be a pretty common navigation scenario. So, is there any "idiomatic" way of doing this?

Answer 1

I believe the simplest (and I believe the appropriate) solution to your problem is to basically use app:popUpTo and app:popUpToInclusive in your action which takes from Home --> Login.

This is a relevant example where when you move from Splash to Home screen, you don't want use to go back to Splash screen when he presses "Back" button.