wangzhuan_android/res/layout/native_ad.xml

<?xml version="1.0" encoding="utf-8"?><!--
  ~ Copyright © 2018-2020 TopOn. All rights reserved.
  ~ https://www.toponad.com
  ~ Licensed under the TopOn SDK License Agreement
  ~ https://github.com/toponteam/TopOn-Android-SDK/blob/master/LICENSE
  -->
<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">

    <RelativeLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:layout_alignParentBottom="true" />
</RelativeLayout>