wulkanowy-mod/app/src/main/res/layout/activity_login.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/loginContainer"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.aurelhubert.ahbottomnavigation.AHBottomNavigationViewPager
        android:id="@+id/loginViewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</FrameLayout>