How to clear navigation Stack after navigating to another fragment in Android

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First, add attributes app:popUpTo='your_nav_graph_id' and app:popUpToInclusive="true" to the action tag.

<fragment
    android:id="@+id/signInFragment"
    android:name="com.glee.incog2.android.fragment.SignInFragment"
    android:label="fragment_sign_in"
    tools:layout="@layout/fragment_sign_in" >
    <action
        android:id="@+id/action_signInFragment_to_usersFragment"
        app:destination="@id/usersFragment"
        app:launchSingleTop="true"
        app:popUpTo="@+id/main_nav_graph"
        app:popUpToInclusive="true" />
</fragment>

Second, navigate to the destination, using above action as parameter.

findNavController(fragment).navigate(
     SignInFragmentDirections.actionSignInFragmentToUserNameFragment())

See the docs for more information.

NOTE: If you navigate using method navigate(@IdRes int resId), you won’t get the desired result. Hence, I used method navigate(@NonNull NavDirections directions).

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