Unity本身也是支持广告的，它是一个广告系统，同时也提供广告中介服务，可以接入其他广告平台。

Unity中添加广告的方式有两种，一种是Advertise Legacy，一种是LevelPlay。前者是Unity自己的广告系统，后者是直接收购后整合进来的。

这两种方式现在都支持，但前者已经不更新了。

所以开发者尽量使用LevelPlay，它在接入其他广告平台时也很方便。

功能/特性	Advertisement Legacy	Ads Mediation
支持广告网络	仅支持 Unity Ads	支持多个广告网络
集成复杂度	简单（少量代码，Unity Ads 默认支持）	较复杂（需额外配置调解规则和安装广告 SDK）
广告填充率	依赖 Unity Ads 的覆盖范围和填充率	利用调解优化填充率
广告收益	收益依赖 Unity Ads	综合多个广告网络的收益，通常更高
适用项目规模	小型项目	中型到大型项目
灵活性	较低	高，支持自定义调解策略

本文主要介绍如何集成传统的 Advertisement Legacy，至于Ads Mediation将在另外一篇中单独介绍。

在集成之前要做：

1. 将项目连接到Service平台
2. 安装Advertisement Legacy包
3. 在cloud平台添加广告单元

（一）集成插屏广告

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Advertisements;public class AdDisplay : MonoBehaviour
{public string myGameIdAndroid = "YOUR_GAME_ID_HERE";public string myGameIdIOS = "YOUR_GAME_ID_HERE";public string adUnitIdAndroid = "Interstitial_Android";public string adUnitIdIOS = "Interstitial_iOS";public string myAdUnitId;public bool adStarted;private bool testMode = true;// Start is called before the first frame updatevoid Start(){#if UNITY_IOSAdvertisement.Initialize(myGameIdIOS, testMode);myAdUnitId = adUnitIdIOS;#elseAdvertisement.Initialize(myGameIdAndroid, testMode);myAdUnitId = adUnitIdAndroid;#endif}// Update is called once per framevoid Update(){if (Advertisement.isInitialized && !adStarted){Advertisement.Load(myAdUnitId);Advertisement.Show(myAdUnitId);adStarted = true;}}

（二）集成奖励广告

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Advertisements;public class RewardedAdDisplay : MonoBehaviour, IUnityAdsInitializationListener, IUnityAdsLoadListener, IUnityAdsShowListener
{public string myGameIdAndroid = "YOUR_GAME_ID_HERE";public string myGameIdIOS = "YOUR_GAME_ID_HERE";public string adUnitIdAndroid = "Rewarded_Android";public string adUnitIdIOS = "Rewarded_iOS";public string myAdUnitId;public string myAdStatus = "";public bool adStarted;public bool adCompleted;private bool testMode = true;// Start is called before the first frame updatevoid Start(){#if UNITY_IOSAdvertisement.Initialize(myGameIdIOS, testMode, this);myAdUnitId = adUnitIdIOS;#elseAdvertisement.Initialize(myGameIdAndroid, testMode, this);myAdUnitId = adUnitIdAndroid;#endif}// Update is called once per framevoid Update(){}public void OnInitializationComplete(){Debug.Log("Unity Ads initialization complete.");Advertisement.Load(myAdUnitId,this);}public void OnInitializationFailed(UnityAdsInitializationError error, string message){myAdStatus = message;Debug.Log($"Unity Ads Initialization Failed: {error.ToString()} - {message}");}public void OnUnityAdsAdLoaded(string adUnitId){Debug.Log("Ad Loaded: " + adUnitId);if (!adStarted){Advertisement.Show(myAdUnitId,this);}}public void OnUnityAdsFailedToLoad(string adUnitId, UnityAdsLoadError error, string message){myAdStatus = message;Debug.Log($"Error showing Ad Unit {adUnitId}: {error.ToString()} - {message}");}public void OnUnityAdsShowFailure(string adUnitId, UnityAdsShowError error, string message){myAdStatus = message;Debug.Log($"Error showing Ad Unit {adUnitId}: {error.ToString()} - {message}");}public void OnUnityAdsShowStart(string adUnitId){adStarted = true;Debug.Log("Ad Started: " + adUnitId);}public void OnUnityAdsShowClick(string adUnitId){Debug.Log("Ad Clicked: " + adUnitId);}public void OnUnityAdsShowComplete(string adUnitId, UnityAdsShowCompletionState showCompletionState){adCompleted = showCompletionState == UnityAdsShowCompletionState.COMPLETED;Debug.Log("Ad Completed: " + adUnitId);}}

（三）集成横幅广告

using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Advertisements;public class BannerAdExample : MonoBehaviour
{// For the purpose of this example, these buttons are for functionality testing:[SerializeField] Button _loadBannerButton;[SerializeField] Button _showBannerButton;[SerializeField] Button _hideBannerButton;[SerializeField] BannerPosition _bannerPosition = BannerPosition.BOTTOM_CENTER;[SerializeField] string _androidAdUnitId = "Banner_Android";[SerializeField] string _iOSAdUnitId = "Banner_iOS";string _adUnitId = null; // This will remain null for unsupported platforms.void Start(){// Get the Ad Unit ID for the current platform:
#if UNITY_IOS_adUnitId = _iOSAdUnitId;
#elif UNITY_ANDROID_adUnitId = _androidAdUnitId;
#endif// Disable the button until an ad is ready to show:_showBannerButton.interactable = false;_hideBannerButton.interactable = false;// Set the banner position:Advertisement.Banner.SetPosition(_bannerPosition);// Configure the Load Banner button to call the LoadBanner() method when clicked:_loadBannerButton.onClick.AddListener(LoadBanner);_loadBannerButton.interactable = true;}// Implement a method to call when the Load Banner button is clicked:public void LoadBanner(){// Set up options to notify the SDK of load events:BannerLoadOptions options = new BannerLoadOptions{loadCallback = OnBannerLoaded,errorCallback = OnBannerError};// Load the Ad Unit with banner content:Advertisement.Banner.Load(_adUnitId, options);}// Implement code to execute when the loadCallback event triggers:void OnBannerLoaded(){Debug.Log("Banner loaded");// Configure the Show Banner button to call the ShowBannerAd() method when clicked:_showBannerButton.onClick.AddListener(ShowBannerAd);// Configure the Hide Banner button to call the HideBannerAd() method when clicked:_hideBannerButton.onClick.AddListener(HideBannerAd);// Enable both buttons:_showBannerButton.interactable = true;_hideBannerButton.interactable = true;     }// Implement code to execute when the load errorCallback event triggers:void OnBannerError(string message){Debug.Log($"Banner Error: {message}");// Optionally execute additional code, such as attempting to load another ad.}// Implement a method to call when the Show Banner button is clicked:void ShowBannerAd(){// Set up options to notify the SDK of show events:BannerOptions options = new BannerOptions{clickCallback = OnBannerClicked,hideCallback = OnBannerHidden,showCallback = OnBannerShown};// Show the loaded Banner Ad Unit:Advertisement.Banner.Show(_adUnitId, options);}// Implement a method to call when the Hide Banner button is clicked:void HideBannerAd(){// Hide the banner:Advertisement.Banner.Hide();}void OnBannerClicked() { }void OnBannerShown() { }void OnBannerHidden() { }void OnDestroy(){// Clean up the listeners:_loadBannerButton.onClick.RemoveAllListeners();_showBannerButton.onClick.RemoveAllListeners();_hideBannerButton.onClick.RemoveAllListeners();}
}

参考：

1.  Unity Ad文档： https://docs.unity.com/ads/en-us/manual/UnityAdsHome

2. https://learn.unity.com/tutorial/getting-started-with-unity-monetization

3. https://learn.unity.com/tutorial/unity-monetization-rewarded-ads