Unity集成AdMob：测试广告正常但真实广告无法显示求助

Let's break down your issue here—you're seeing java.lang.IllegalStateException: Invalid application ID in LogCat, which explains why real ads won't load even though test ads work. Test ads don't validate your App ID against your app's package name, so that's why they're working fine. Here's how to fix this:

1. Fix Your Manifest's Package Name #

Looking at your XML file, the package attribute is set to com.google.unity.ads—this is a default placeholder, not your actual app's package name. AdMob ties your App ID directly to the package name registered in your AdMob dashboard. If these don't match, the SDK will reject your App ID as invalid.

Update the package value in your manifest to match exactly what you used when creating your app in the AdMob dashboard:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.yourcompany.yourgamename" <!-- Replace with your actual package name -->
    android:versionName="1.0"
    android:versionCode="1">
    <application>
        <uses-library android:required="false" android:name="org.apache.http.legacy" />
        <meta-data android:name="com.google.android.gms.ads.APPLICATION_ID"
            android:value="ca-app-pub-6068823890509836~9548685797" />
    </application>
</manifest>

2. Double-Check Your App ID #

Even though your code and manifest have the same App ID, it's worth verifying that you copied the correct one from AdMob:

• Go to your AdMob dashboard, select your app, and copy the Application ID (it follows the format ca-app-pub-XXXXXXXXXXXXXXXX~YYYYYYYYYY).
• Paste this directly into both your C# code and manifest file—avoid typing it manually to prevent typos or extra spaces at the start/end.

3. Ensure Your Ad Unit is Linked to the Correct App #

Your banner ad unit ID (ca-app-pub-6068823890509836/3679968367) must be created under the same app in AdMob that corresponds to your App ID. If you created the ad unit in a different AdMob app, it won't work with your current App ID.

4. Adjust Initialization to Wait for SDK Ready #

Your current code initializes the SDK and immediately requests an ad—sometimes the SDK isn't fully ready yet. Switch to using the initialization callback to ensure you only load ads after the SDK is ready:

void Start() {
#if UNITY_ANDROID
    string appId = "ca-app-pub-6068823890509836~9548685797";
#elif UNITY_IPHONE
    string appId = "ca-app-pub-3940256099942544~1458002511";
#else
    string appId = "unexpected_platform";
#endif
    // Initialize with callback to ensure SDK is ready before loading ads
    MobileAds.Initialize(initStatus => {
        this.RequestBanner();
    });
}

5. Verify Ad Unit Activation #

Even though your ad unit is over 24 hours old, it's possible it hasn't been fully activated yet. AdMob sometimes takes a bit longer for new ad units to start serving ads, especially if there's no traffic. You can check the ad unit status in your AdMob dashboard to confirm it's active.

Once you make these changes, rebuild your APK and test again. The Invalid Application ID error should be resolved, and real ads should start loading if there's available inventory.

内容的提问来源于stack exchange，提问作者Ivanh23