加载AdMob AdUnitId时提示缺少adSize属性的技术求助

Hey there! Let’s tackle this frustrating AdMob issue you’re hitting. It’s weird that test AdUnitIds work fine, but your custom ones throw that adSize missing error—especially since you’re explicitly setting setAdSize(AdSize.BANNER) in code. Let’s break down the likely causes and fixes:

Common Causes & Solutions #

1. ViewHolder Reuse is Causing Old AdViews to Stick

Since you’re using a ViewHolder (likely in a RecyclerView), the problem might be that reused holders still have old AdViews attached, and your new configuration isn’t overriding them properly. Here’s how to fix that:

• Before adding a new AdView, clear all existing views from the container to avoid conflicts:

// In your onBindViewHolder method
RelativeLayout layout = (RelativeLayout) holder.view.findViewById(R.id.Lr);
// Remove any existing AdViews first
layout.removeAllViews();

// Now create and configure the new AdView
holder.mAdView = new AdView(mContext);
holder.mAdView.setAdSize(AdSize.BANNER);
holder.mAdView.setAdUnitId(BANNER_ID);

// Add proper layout params so the AdView renders correctly
RelativeLayout.LayoutParams adParams = new RelativeLayout.LayoutParams(
    RelativeLayout.LayoutParams.MATCH_PARENT,
    RelativeLayout.LayoutParams.WRAP_CONTENT
);
layout.addView(holder.mAdView, adParams);

// Load the ad
AdRequest adRequest = new AdRequest.Builder().build();
holder.mAdView.loadAd(adRequest);

2. Your Custom AdUnitId Doesn’t Match the Ad Type

Double-check that the AdUnitId you’re using is specifically for banner ads. If you accidentally created an interstitial or native ad unit in AdMob, the SDK will throw misleading errors (like this adSize missing message) because the ad type doesn’t align with your code setup. Head to your AdMob dashboard and confirm the ad unit type is "Banner".

3. Layout Parameters Are Missing or Incorrect

Dynamic AdViews need explicit layout parameters to tell the SDK how to render them. If you don’t set these, the system might not recognize the adSize you configured. Make sure you’re passing MATCH_PARENT for width (to fit the screen) and WRAP_CONTENT for height (since banner ads have a fixed height based on AdSize.BANNER).

4. Cache or Build Issues

Sometimes Android Studio’s build cache can cause odd behavior. Try these steps to rule that out:

• Go to Build > Clean Project
• Then Build > Rebuild Project
• Uninstall the app from your test device and reinstall the fresh build

5. Enable Debug Logs for More Context

If none of the above works, turn on AdMob’s debug logs to get more detailed error info:

// Add this in your Application class's onCreate method
MobileAds.initialize(this);
MobileAds.setRequestConfiguration(
    new RequestConfiguration.Builder()
        .setTestDeviceIds(Arrays.asList("YOUR_TEST_DEVICE_ID")) // Get this from logcat
        .build()
);
AdSettings.setLogLevel(AdSettings.LogLevel.DEBUG);

Check logcat for more specific messages about why the adSize is being flagged as missing.

内容的提问来源于stack exchange，提问作者Clément H