Change NavigationView items when user is logged

I thing the best approach to this is to include all your items in the menu and the change their visibility.

<item
    android:id="@+id/login"
    android:icon="@drawable/ic_action_person"
    android:title="@string/login"
    android:visible="true" />

<item
    android:id="@+id/logout"
    android:icon="@drawable/ic_action_person"
    android:title="@string/logout"
    android:visible="false" />

then

navigationView.getMenu().findItem(R.id.login).setVisible(false);
navigationView.getMenu().findItem(R.id.logout).setVisible(true);

You can also do this with whole groups of items

<group
    android:id="@+id/group_1"
    android:checkableBehavior="single"
    android:visible="false">
    ...
</group>

and

navigationView.getMenu().setGroupVisible(R.id.group_1, true)

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