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fragment_admob_ad_listener.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ads="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=".AdListenerFragment">

<TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:paddingBottom="16dp"
        android:paddingTop="16dp"
        android:text="@string/listener_fragment_title"
        android:textAppearance="@android:style/TextAppearance.Large" />

<com.google.android.gms.ads.AdView
        android:id="@+id/listener_av_main"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        ads:adSize="BANNER"
        ads:adUnitId="@string/admob_banner_ad_unit_id" />
</RelativeLayout>