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Unity Interstitial Ads Integration Tutorial

In this tutorial, you will learn how to integrate interstitial ads into your Unity project using the Google Mobile Ads SDK. Interstitial ads are full-screen ads displayed at natural transition points in your app, such as between levels of a game. Below is the complete C# script with detailed explanations and a "Copy Code" button for easy use.

Step-by-Step Explanation

1. Initialize the SDK: The MobileAds.Initialize method initializes the Google Mobile Ads SDK.
2. Load an Interstitial Ad: The LoadInterstitialAd method handles ad requests and ensures that ads are ready for display.
3. Show the Ad: The ShowInterstitialAd method checks if an ad is ready before showing it to the user.
4. Event Handlers: Ad lifecycle events like impressions, clicks, and fullscreen closures are logged and handled.
5. Reload on Close: The RegisterReloadHandler ensures a new ad loads after the previous one closes.

Unity C# Script

using UnityEngine;
using GoogleMobileAds.Api;
using System;

public class InterstitialAdManager : MonoBehaviour
{
    public string InterstitialID = "";
    private InterstitialAd _interstitialAd;

    void Start()
    {
        MobileAds.Initialize((InitializationStatus initStatus) =>
        {
            LoadInterstitialAd();
        });

        Invoke("AutoShowAd", 5f);
    }

    public void LoadInterstitialAd()
    {
        if (_interstitialAd != null)
        {
            _interstitialAd.Destroy();
            _interstitialAd = null;
        }

        Debug.Log("Loading the interstitial ad.");
        var adRequest = new AdRequest();
        InterstitialAd.Load(InterstitialID, adRequest,
            (InterstitialAd ad, LoadAdError error) =>
            {
                if (error != null || ad == null)
                {
                    Debug.LogError("Interstitial ad failed to load: " + error);
                    return;
                }

                Debug.Log("Interstitial ad loaded.");
                _interstitialAd = ad;
                RegisterEventHandlers(_interstitialAd);
            });
    }

    public void ShowInterstitialAd()
    {
        if (_interstitialAd != null && _interstitialAd.CanShowAd())
        {
            Debug.Log("Showing interstitial ad.");
            _interstitialAd.Show();
        }
        else
        {
            Debug.LogError("Interstitial ad is not ready yet.");
        }
    }

    private void RegisterEventHandlers(InterstitialAd interstitialAd)
    {
        interstitialAd.OnAdPaid += (AdValue adValue) =>
        {
            Debug.Log($"Ad paid {adValue.Value} {adValue.CurrencyCode}.");
        };

        interstitialAd.OnAdImpressionRecorded += () =>
        {
            Debug.Log("Ad impression recorded.");
        };

        interstitialAd.OnAdClicked += () =>
        {
            Debug.Log("Ad clicked.");
        };

        interstitialAd.OnAdFullScreenContentOpened += () =>
        {
            Debug.Log("Ad opened fullscreen content.");
        };

        interstitialAd.OnAdFullScreenContentClosed += () =>
        {
            Debug.Log("Ad closed fullscreen content.");
            LoadInterstitialAd();
        };
    }
}
        

Copy the script above, replace InterstitialID with your Ad Unit ID, and attach the script to a GameObject in Unity to enable interstitial ads in your project.