Unity游戏项目中接入GoogleAdMob

先看效果图

接入测试横幅广告，代码如下：

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

public class GoogleAdMobManager : MonoBehaviour
{
    private static GoogleAdMobManager _instance;  

     public static GoogleAdMobManager Instance  
    {  
        get  
        {  
            if (_instance == null)  
            {  
                // 尝试在场景中找到GoogleAdMobManager实例  
                _instance = FindObjectOfType<GoogleAdMobManager>();  
  
                if (_instance == null)  
                {  
                    Debug.LogError("GoogleAdMobManager instance not found in the scene!");  
                }  
            }  
            return _instance;  
        }  
    }  

    private void Awake()  
    {  
        // 确保不会创建GoogleAdMobManager的多个实例  
        if (_instance != null && _instance != this)  
        {  
            Destroy(gameObject);  
            return;  
        }  
          
        _instance = this;  
        DontDestroyOnLoad(gameObject); // 防止在加载新场景时销毁此对象（可选）  
    }  

    void Start()
    {
        MobileAds.Initialize((InitializationStatus initStatus) =>
        {
            CreateBannerView();  
            LoadAd();  
            ListenToAdEvents(); 

            // LoadInterstitialAd();           
          
        });
    }

    // Update is called once per frame
    void Update()
    {
        
    }


    #if UNITY_ANDROID
  private string _adUnitId = "ca-app-pub-3940256099942544/6300978111";
#elif UNITY_IPHONE
  private string _adUnitId = "ca-app-pub-3940256099942544/2934735716";
#else
  private string _adUnitId = "unused";
#endif

  BannerView _bannerView;

  /// <summary>
  /// Creates a 320x50 banner view at top of the screen.
  /// </summary>
  public void CreateBannerView()
  {
      Debug.Log("Creating banner view");

      //