activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@id/bottom_nav">

        <com.google.android.material.appbar.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:backgroundTint="@color/color_background"
            app:elevation="0dp">

            <com.google.android.material.appbar.MaterialToolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:subtitleTextAppearance="@style/SubtitleText"
                app:titleTextAppearance="@style/TitleText" />

            <View
                android:layout_width="match_parent"
                android:layout_height="1dp"
                android:alpha="0.8"
                android:background="?android:dividerVertical" />

        </com.google.android.material.appbar.AppBarLayout>

        <androidx.fragment.app.FragmentContainerView
            android:id="@+id/nav_host_container"
            android:name="androidx.navigation.fragment.NavHostFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            app:defaultNavHost="true"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"
            app:navGraph="@navigation/navigations" />

    </androidx.coordinatorlayout.widget.CoordinatorLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_above="@+id/bottom_nav"
        android:alpha="0.8"
        android:background="?android:dividerVertical" />

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottom_nav"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:background="@color/color_background"
        app:elevation="0dp"
        app:labelVisibilityMode="unlabeled"
        app:menu="@menu/menu_bottom_nav" />

</RelativeLayout>