// note: the fragments id in the nav graph MUST BE IDENTICAL to the tabs id in the navigation menu resource file

bottomNavigationView.setupWithNavController(navController)

 <com.google.android.material.bottomnavigation.BottomNavigationView

        android:id="@+id/bottomNavigationView"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent"

        app:menu="@menu/activity_main_drawer" />

​

    <fragment

        android:id="@+id/nav_host_fragment"

        android:name="androidx.navigation.fragment.NavHostFragment"

        android:layout_width="match_parent"

        android:layout_height="0dp"

        app:defaultNavHost="true"

        app:layout_constraintBottom_toTopOf="@+id/bottomNavigationView"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toTopOf="parent"

        app:navGraph="@navigation/mobile_navigation" />

binding = ActivityMain2Binding.inflate(layoutInflater)

        setContentView(binding.root)

​

        val navController = findNavController(R.id.nav_host_fragment)

        val navView = binding.bottomNavigationView

        navView.setupWithNavController(navController)