Navigation Architecture Component - Login screen

Question

I am planning to implement navigation like this:

The problem I face is when user is in LoginFragmennt and presses back button it again loads up LognFragment ie. stuck in loop.

I navigate to LoginnFragment using conditional navigation as per this answer.

How to properly implement this?

Answer 1

IMHO how I do it in my app is a little cleaner. Just add these settings in the nav graph:

<fragment
    android:id="@+id/profile_dest"
    android:name="com.example.ProfileFragment">
    <action
        android:id="@+id/action_profile_dest_to_login_dest"
        app:destination="@id/login_dest"
        app:popUpTo="@+id/profile_dest"
        app:popUpToInclusive="true" />       
</fragment>

and then navigate to login via

findNavController().navigate(R.id.action_profile_dest_to_login_dest).

popUpTo and popUpToInclusive close ProfileFragment when we navigate to LoginFragment so if the user navigates back, it exits the app.