您提到的上述资源已经陈旧。鉴于Google现在已在Unity游戏引擎上对AdMob提供官方支持。

The above resources you mentioned are old. Whereas now google has official support for AdMob on Unity game engine.

在此处获取官方插件- https://github.com/googleads/googleads-mobile-plugins/blob/master/README.md

Get the official plugin here -https://github.com/googleads/googleads-mobile-plugins/blob/master/README.md

-导入整个程序包。修改您的androidmanifest.xml以包含许可权和活动名称。

-Import the whole package. Modify your androidmanifest.xml to include the permission and activity name.

-在您的/ extras / google / google_google_play_services / libproject中添加google-play-services_lib文件夹sdk，放到您项目的Plugins / Android文件夹中。

-Add the google-play-services_lib folder, located at /extras/google/google_play_services/libproject in your sdk, into the Plugins/Android folder of your project.

• 要在C＃脚本中包含基本横幅的代码：-

使用GoogleMobileAds.Api；

using GoogleMobileAds.Api;

//创建

BannerView bannerView = new BannerView（ YOUR_AD_UNIT_ID，AdSize.Banner，AdPosition.Top）;

BannerView bannerView = new BannerView("YOUR_AD_UNIT_ID", AdSize.Banner, AdPosition.Top);

//创建一个空广告请求。

// Create an empty ad request.

AdRequest request = new AdRequest.Builder（）。Build（）;

AdRequest request = new AdRequest.Builder().Build();

//用请求加载横幅。

// Load the banner with the request.

bannerView.LoadAd（request）;

bannerView.LoadAd(request);

您将能够在附加了特定脚本的级别的顶部看到广告。

And you would be able to see Ads on the top of your level on which that particular script is attached.