AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<!--

This Google Mobile Ads plugin library manifest will get merged with your
application's manifest, adding the necessary activity and permissions
required for displaying ads.

-->
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.google.unity"
    android:versionName="1.0"
    android:versionCode="1">
  <uses-sdk android:minSdkVersion="9"
      android:targetSdkVersion="19" />
  <!-- Google Mobile Ads Permissions -->
  <uses-permission android:name="android.permission.INTERNET"/>
  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
  <application>
    <!-- Denote the referenced Google Play services version -->
    <meta-data android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />
    <!-- Google Mobile Ads Activity -->
    <activity android:name="com.google.android.gms.ads.AdActivity"
        android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"/>

        <activity android:name="com.unity3d.player.UnityPlayerNativeActivity"
    android:label="@string/app_name">
    <intent-filter>
      <action android:name="android.intent.action.MAIN" />
      <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
    <meta-data android:name="unityplayer.UnityActivity" android:value="true" />
    <meta-data android:name="unityplayer.ForwardNativeEventsToDalvik"
        android:value="true" />
        </activity>

  </application>
</manifest>