UnityアプリにAdMobを実装する！準備編[Google Mobile Ads]

using GoogleMobileAds.Api;

MobileAds.RaiseAdEventsOnUnityMainThread = true;

using UnityEngine;
using GoogleMobileAds.Api;

public class AdmobManager : MonoBehaviour
{
    public static AdmobManager Instance
    {
        get
        {
            if (instance == null)
            {
                instance = FindObjectOfType<AdmobManager>();
            }
            return instance;
        }
    }
    public static AdmobManager instance;


    private bool isReady = false;
    public bool IsReady
    {
        get
        {
            return isReady;
        }
    }
    void Start()
    {
        if (this != Instance)
        {
            Destroy(gameObject);
            return;
        }
        else
        {
            DontDestroyOnLoad(gameObject);
            instance = this;
        }
        MobileAds.RaiseAdEventsOnUnityMainThread = true;
        MobileAds.Initialize(initStatus =>
        {
            isReady = true;
            Debug.Log(initStatus);
        });
    }
}

using System.Collections;
using UnityEngine;
using GoogleMobileAds.Common;

public abstract class AdmobUnitBase : MonoBehaviour
{
    [SerializeField] private string unitIDAndroid;
    [SerializeField] private string unitIDIOS;

    protected string UnitID
    {
        get
        {
#if UNITY_ANDROID
            return unitIDAndroid;
#elif UNITY_IOS
            return unitIDIOS;
#else
            return "";
#endif
        }
    }
    private void OnAppStateChangedBase(AppState state)
    {
        Debug.Log("App State changed to : " + state);
        OnAppStateChanged(state);
    }

    private IEnumerator Start()
    {
        while (AdmobManager.Instance.IsReady == false)
        {
            yield return 0;
        }
        Initialize();
    }
    protected virtual void Initialize()
    {
        // AdsManagerの初期化が終わったあとに呼ばれる
    }
    protected virtual void OnAppStateChanged(AppState state)
    {
    }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using GoogleMobileAds.Api;

public class AdmobUnitBanner : AdmobUnitBase
{
    private BannerView bannerView;
#if UNITY_ANDROID
    private string bannerUnitId = "ca-app-pub-3940256099942544/6300978111";
#elif UNITY_IPHONE
    private string bannerUnitId = "ca-app-pub-3940256099942544/2934735716";
#else
  private string bannerUnitId = "unused";
#endif

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

    public void ShowBanner()
    {
        if (bannerView != null)
        {
            Debug.Log("Destroying banner view.");
            bannerView.Destroy();
            bannerView = null;
        }

        bannerView = new BannerView(
            bannerUnitId,
            AdSize.Banner,
            AdPosition.Bottom);

        bannerView.OnBannerAdLoaded += () =>
        {
            Debug.Log("ロードされました - 表示します");
            bannerView.Show();
        };
        bannerView.OnBannerAdLoadFailed += (LoadAdError error) =>
        {
            Debug.Log("ロード失敗しました");
        };

        //リクエストを生成
        var adRequest = new AdRequest();
        bannerView.LoadAd(adRequest);
    }
}