bottom_view.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
  
  <com.vadmax.fabbottomnavigationview.FabBottomNavigationView
        android:id="@+id/bottomNavigationView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        app:fab_cradle_margin="8dp"
        app:fab_cradle_rounded_corner_radius="8dp"
        app:fab_size="50dp" />
 
</androidx.coordinatorlayout.widget.CoordinatorLayout>