Unity集成AdMob真实横幅广告不显示，仅测试广告正常问题排查

Hey there! Let's figure out why your real AdMob banners aren't loading—test ads working is a good sign, so we can narrow this down to a few common issues new AdMob users run into:

1. Ad Unit & Account Approval Status #

First things first: real ad units need to be approved by AdMob before they can serve ads. Test ads bypass this approval, but real ones don’t. Head over to your AdMob dashboard, find your banner ad unit, and check its status. If it says "Pending approval" or "Requires action", you’ll just need to wait for the review (usually takes a few hours to 1-2 days). If it’s "Approved", move on to the next checks.

2. Missing Error Handling (Critical for Debugging) #

Your current code doesn’t listen for ad load failures, so you have no way of knowing why the real ad isn’t showing. Let’s add event handlers to catch errors—this will give you specific messages like "no ad fill" or "invalid configuration".

Here’s how to update your code:

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

public class AdManager : MonoBehaviour {
    private string appId = "ca-app-pub-7564160460291568~xxxxxxxx";
    private BannerView bannerAd;

    void Start() {
        // Wait for initialization to complete before requesting ads
        MobileAds.Initialize(initStatus => {
            RequestBanner();
        });
    }

    void RequestBanner() {
        string bannerId = "ca-app-pub-7564160460291568/xxxxxxx";
        bannerAd = new BannerView(bannerId, AdSize.SmartBanner, AdPosition.Bottom);

        // Add event handlers for success/failure
        bannerAd.OnAdLoaded += HandleAdLoaded;
        bannerAd.OnAdFailedToLoad += HandleAdFailedToLoad;
        bannerAd.OnAdOpening += HandleAdOpened;

        AdRequest adRequest = new AdRequest.Builder().Build();
        bannerAd.LoadAd(adRequest);
    }

    // Log success
    public void HandleAdLoaded(object sender, EventArgs args) {
        Debug.Log("Banner ad loaded successfully!");
        bannerAd.Show(); // No need for a separate DisplayBanner method now
    }

    // Critical: Log error details
    public void HandleAdFailedToLoad(object sender, AdFailedToLoadEventArgs args) {
        Debug.LogError($"Banner failed to load: {args.LoadAdError.GetMessage()}");
    }

    public void HandleAdOpened(object sender, EventArgs args) {
        Debug.Log("Banner ad opened!");
    }
}

After adding this, check the Unity Console when you run the app—you’ll get a clear error message that points to the root cause.

3. Missing App ID Configuration in Platform Manifest/Plist #

Even if you pass the app ID in code, you still need to declare it in your Android or iOS project files:

• Android: Open your AndroidManifest.xml (under Assets/Plugins/Android) and add this inside the <application> tag:

  <meta-data
      android:name="com.google.android.gms.ads.APPLICATION_ID"
      android:value="ca-app-pub-7564160460291568~xxxxxxxx"/>
  

• iOS: Open your Info.plist (under Assets/Plugins/iOS) and add a new key GADApplicationIdentifier with your app ID as the value.

Skipping this step can block real ads from loading, even if test ads work.

4. Low Ad Fill Rate #

If your ad unit is approved but you’re still seeing "no ad fill" errors, it might be because:

• Your app is new, and AdMob hasn’t built up ad inventory for it yet. Give it a day or two, or try promoting your app a bit to get more traffic.
• Your target audience/region has limited ad inventory. Try testing with a different ad format (like interstitial ads) or expanding your target regions temporarily.
• You’re testing on a simulator—real ads sometimes don’t load on simulators, so use a physical device instead.

5. Initialization Timing #

Your original code calls RequestBanner() right after MobileAds.Initialize(), but initialization is asynchronous. By wrapping RequestBanner() in the Initialize callback (like in the updated code), you ensure the AdMob SDK is fully ready before requesting ads, which avoids race conditions that can block ad loads.

Start with checking the ad unit approval status and adding error logging—those are the quickest ways to pinpoint the issue. Let me know what the console error says if you get stuck!

内容的提问来源于stack exchange，提问作者Axel