How to display a Interstitial Ad in a LibGDX project?

Question

I found a Flappy Bird GitHub project and changed it a little bit. I successfully implemented the AdMob Banner.

But now I also want a Interstitial Ad which pops up w

Answer 1

You already integrated banner Ad so no need to injected dependent artifact in your project.

Follow these steps for Interstitial Ad integration.

1. AndroidManifest.xml

   Make an entry of AdActivity for Interstitial Ad

2. Create an interface inside your core module

   public interface AdService {
   
      boolean isInterstitialLoaded();
      void showInterstitial();
   }
   

3. Create a parameterized constructor of FlappyGame class

   public AdService adService;
   
   public FlappyGame(AdService ads){
        adService=ads;
   }
   

4. Implement AdService interface to your AndroidLauncher class

   public class AndroidLauncher extends AndroidApplication implements AdService {
   
       private static final String AD_UNIT_ID_INTERSTITIAL = "ca-app-pub-XXXXX/XXXXX";
       private InterstitialAd interstitialAd;
   
       @Override
       protected void onCreate (Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
   
            ...
            View gameView=initializeForView(new FlappyGame(this), config);
            ...
   
            interstitialAd = new InterstitialAd(this);
            interstitialAd.setAdUnitId(AD_UNIT_ID_INTERSTITIAL);
            interstitialAd.setAdListener(new AdListener() {
                 @Override
                 public void onAdLoaded() {}
   
                 @Override
                 public void onAdClosed() {
                      loadIntersitialAd();
                 }
            });
   
            loadIntersitialAd();
       }
   
       private void loadIntersitialAd(){
   
          AdRequest interstitialRequest = new AdRequest.Builder().build();
          interstitialAd.loadAd(interstitialRequest);
       }
   
     @Override
     public void showInterstitial() {
            runOnUiThread(new Runnable() {
                public void run() {
                  if (interstitialAd.isLoaded())
                     interstitialAd.show();
                  else
                     loadIntersitialAd();
                }
            });
      }
   
      @Override
      public boolean isInterstitialLoaded() {
           return interstitialAd.isLoaded();
      }
   }
   

5. GameScreen class

   RunnableAction playWooshAction = Actions.run(new Runnable() {
           @Override
           public void run() {
               com.pentagames.flappybibi.Assets.playWooshSound();
                game.adService.showInterstitial();
           }
   });
   

I integrated Interstitial Ad in your project, created a pull request for the same. You can merge my pull request.