AdMobBuddy

A super easy to use library for adding AdMob ads to Xamarin.Android, Xamarin.iOS, and MonoGame apps.

Step one:

Add the nuget package located at: https://www.nuget.org/packages/AdMobBuddy/

Step two (Android):

Initialize the library in your Activity class:

//first param is an Activity
IAdManager ads = new AdMobAdapter(this, 
"your AdMob app ID", 
"your AdMob Banner Ad ID",
"your AdMob interstitial ad unit ID", 
"your Admob rewarded video ad unit ID"

Add your AdMob app ID to the .manifest file:

<application>
		<meta-data android:name="com.google.android.gms.ads.APPLICATION_ID" android:value="your AdMob app ID" />
</application>

Step two (iOS):

Initialize the library: (in MonoGame, add this in your UIApplicationDelegate class)

//the first param is a UIViewController
IAdManager ads = new AdMobAdapter(game.Services.GetService<UIViewController>(), 
"your AdMob Banner Ad ID",
"your AdMob interstitial ad unit ID", 
"your Admob rewarded video ad unit ID"

Add your AdMob app ID to the info.plist file:

<key>GADApplicationIdentifier</key>
<string>your AdMob app ID</string>

Step three (banner):

Display a banner ad:

ads.DisplayBannerAd();

Step four (interstitial):

Display an ad:

ads.DisplayInterstitialAd();

Step five (rewarded video):

Display an ad and listen for the reward:

ads.OnVideoReward += VideoReward;
ads.DisplayRewardedVideoAd();

Step six:

profit

If you still have any questions, there is a full-blown functioning app example at: https://github.com/dmanning23/AdMobBuddy/tree/master/Sample