admob 广告Android不显示

我弄个了ane，iOS上好好的，Android上打死不显示，

最后发现是少在xml里面增加一个配置，百度半天没搜索到。

<android>

<manifestAdditions><![CDATA[

<manifest android:installLocation="auto">

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

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

<application>

<meta-data android:name="com.google.android.gms.version"

android:value="@integer/google_play_services_version" />

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

</application>

</manifest>

]]>

</manifestAdditions>

</android>