team2_jj_android/res/layout/banner_ad.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:id="@+id/banner_container"
        android:layout_width="match_parent"
        android:layout_height="150dp"
        android:layout_alignParentBottom="true"
        android:orientation="horizontal" />
</RelativeLayout>