Sample of adding an AdMob banner to an Android MonoGame game.
The code in MonoGameAdMob.cs needs Xamarin.GooglePlayServices.Ads.Lite to be installed from NuGet.
Is the Target SDK set to 31 [Android S 12] or newer, Xamarin.AndroidX.Work.Runtime version 2.7.0 or newer alsa has to be installed from NuGet, otherwise there will be errors about FLAG_IMMUTABLE.
Add this code as it is to the project.
Add the following lines to the <application> section in the AndroidManifest.xml file. Change the Application ID
to the correct Application ID.
<meta-data android:name="com.google.android.gms.ads.APPLICATION_ID"
android:value="ca-app-pub-3940256099942544~3347511713" />
<activity android:name="com.google.android.gms.ads.AdActivity"
android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
android:theme="@android:style/Theme.Translucent" />
Add the following permissions.
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
To use a banner at the top of the screen, the game has to be in full screen mode, otherwise the banner will be covered from the icons bar at the top of the screen and that's not allowed.
Add this line in Game1() for full screen mode.
_graphics.IsFullScreen = true;
These to lines will show the banner. Change the Advertisement ID to the correct Advertisement ID.
MonoGameAdMob.IAdManager ads = new MonoGameAdMob.AdMobAdapter(this, "ca-app-pub-3940256099942544/6300978111");
ads.ShowBannerAd(MonoGameAdMob.BannerPosition.TopBanner);
Change parameter in second line to MonoGameAdMob.BannerPosition.BottomBanner to position the banner at the bottom of the screen.
If some margin is wanted, under a bottom banner or above a top banner, add the margin to the ShowBannerAd() function.
ads.ShowBannerAd(MonoGameAdMob.BannerPosition.BottomBanner, 46);
To hide the banner, use this line.
ads.HideBannerAd();
The banner is not allowed to cover any part of the game. The following line will calculate the height of the banner so start position of game content can be calculated.
int height = ads.BannerHeight();