AdMobのインタースティシャル広告を実装ス【Unity+Admob】

using UnityEngine;
using GoogleMobileAds.Api;
using System;

public class AdmobUnitInterstitial : AdmobUnitBase
{
    private InterstitialAd interstitialAd;

    public bool IsReady
    {
        get
        {
            if (AdmobManager.Instance.IsReady == false)
            {
                return false;
            }
            return interstitialAd != null && interstitialAd.CanShowAd();
        }
    }

    protected override void Initialize()
    {
        LoadInterstitialAd();
    }

    public void ShowInterstitial()
    {
        if (IsReady)
        {
            interstitialAd.Show();
        }
        else
        {
            Debug.Log("Interstitial ad is not ready yet.");
        }
    }

    private void LoadInterstitialAd()
    {
        // Clean up the old ad before loading a new one.
        if (interstitialAd != null)
        {
            interstitialAd.Destroy();
            interstitialAd = null;
        }

        var adRequest = new AdRequest();

        InterstitialAd.Load(UnitID, adRequest,
            (InterstitialAd ad, LoadAdError error) =>
            {
                if (error != null || ad == null)
                {
                    Debug.LogError("interstitial ad failed to load an ad " +
                                   "with error : " + error);
                    return;
                }

                Debug.Log("Interstitial ad loaded with response : "
                          + ad.GetResponseInfo());

                interstitialAd = ad;
                RegisterEventHandlers(interstitialAd);
            });
    }

    private void RegisterEventHandlers(InterstitialAd interstitialAd)
    {
        // Raised when the ad is estimated to have earned money.
        interstitialAd.OnAdPaid += (AdValue adValue) =>
        {
            Debug.Log(String.Format("Interstitial ad paid {0} {1}.",
                adValue.Value,
                adValue.CurrencyCode));
        };
        // Raised when an impression is recorded for an ad.
        interstitialAd.OnAdImpressionRecorded += () =>
        {
            Debug.Log("Interstitial ad recorded an impression.");
        };
        // Raised when a click is recorded for an ad.
        interstitialAd.OnAdClicked += () =>
        {
            Debug.Log("Interstitial ad was clicked.");
        };
        // Raised when an ad opened full screen content.
        interstitialAd.OnAdFullScreenContentOpened += () =>
        {
            Debug.Log("Interstitial ad full screen content opened.");
        };
        // Raised when the ad closed full screen content.
        interstitialAd.OnAdFullScreenContentClosed += () =>
        {
            Debug.Log("Interstitial ad full screen content closed.");
            LoadInterstitialAd();
        };
        // Raised when the ad failed to open full screen content.
        interstitialAd.OnAdFullScreenContentFailed += (AdError error) =>
        {
            Debug.LogError("Interstitial ad failed to open full screen content " +
                           "with error : " + error);
            LoadInterstitialAd();
        };
    }
}

using UnityEngine;
using UnityEngine.UI;

public class TestInterstitial : MonoBehaviour
{
    public Button showInterstitialButton;

    public AdmobUnitInterstitial admobUnitInterstitial;

    private void Start()
    {
        showInterstitialButton.interactable = false;

        showInterstitialButton.onClick.AddListener(() =>
        {
            admobUnitInterstitial.ShowInterstitial();
            showInterstitialButton.interactable = false;
        });
    }

    private void Update()
    {
        showInterstitialButton.interactable = admobUnitInterstitial.IsReady;
    }
}