new update Integrating AdMob in your Android App example

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

 <com.google.ads.AdView
        android:id="@+id/AdView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        ads:adSize="BANNER"
        ads:adUnitId="@string/banner_ad_unit_id"
        ads:loadAdOnCreate="True" />

</RelativeLayout>

AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

<activity android:name="com.google.ads.AdActivity"    android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize" />

add libs folder bellow jar file

- GoogleAdMobAdsSdk-6.0.1.jar