How to ensure that the Android adView is always displayed after the bottom of the last item in my Android listView?

Here's the activity_results XML layout:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    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="com.test.test.ResultsActivity">

    <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">

        <com.google.android.material.appbar.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:theme="@style/AppTheme.AppBarOverlay">

            <androidx.appcompat.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                app:popupTheme="@style/AppTheme.PopupOverlay"
                app:titleTextAppearance="@style/ToolbarTitle" />

            <com.google.android.material.tabs.TabLayout
                android:id="@+id/tabs"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_centerHorizontal="true"
                android:layout_gravity="center_horizontal"
                app:tabMaxWidth="0dp">

                <com.google.android.material.tabs.TabItem
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/tab_text_1" />

                <com.google.android.material.tabs.TabItem
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/tab_text_2" />
            </com.google.android.material.tabs.TabLayout>

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

        <androidx.viewpager.widget.ViewPager
            android:id="@+id/container"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />

        <androidx.constraintlayout.widget.ConstraintLayout 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"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"
            tools:context="com.test.test.ResultsActivity">

            <ListView
                android:id="@+id/listView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:layout_constraintBottom_toTopOf="@+id/adView"></ListView>

            <com.google.android.gms.ads.AdView xmlns:ads="http://schemas.android.com/apk/res-auto"
                android:id="@+id/adView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentBottom="true"
                android:layout_gravity="center|bottom"
                ads:adSize="SMART_BANNER"
                ads:adUnitId="@string/banner_ad_unit_id"
                app:layout_constraintBottom_toBottomOf="parent" />
        </androidx.constraintlayout.widget.ConstraintLayout>
    </androidx.coordinatorlayout.widget.CoordinatorLayout>

</RelativeLayout>

And, here's the content_results.xml layout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="@dimen/activity_horizontal_margin">

    <TextView
        android:id="@+id/abc"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingBottom="10dip"
        android:textColor="@color/colorAccent"
        android:textSize="14sp"
        android:textStyle="bold" />

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">

        <TextView
            android:id="@+id/def"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text=""
            android:textColor="@color/colorPrimary"
            android:textSize="14sp"
            android:textStyle="bold" />
    </RelativeLayout>

    <TextView
        android:id="@+id/ghi"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=""
        android:textColor="@color/colorPrimary"
        android:textSize="14sp"
        android:textStyle="bold" />
</LinearLayout>

I want to have the adView item at the bottom of the last element of the listView. Is this possible with the layouts I currently have? Because it looks like the adView in the activity_results has no relation to the list items in the content_results file?

I've also tried app:layout_constraintBottom_toTopOf attribute to position the adView below the ListView, but there seems to be no change.

Please let me know if you can catch any other basic errors in these layouts?

from How to ensure that the Android adView is always displayed after the bottom of the last item in my Android listView?