Android应用广告无法加载求助：测试设备请求后提示广告未加载

Hey there! Let's dig into why your interstitial ad isn't loading even though your logs confirm the request is sent from a test device. Here's a step-by-step breakdown of the most likely issues and fixes:

1. You're Missing the Critical Ad Load Call #

Looking at your truncated code snippet, you've initialized the PublisherInterstitialAd and set the AdUnit ID—but you haven't triggered the actual ad load request. Ads won't load automatically; you need to explicitly call loadAd() to start the process.

2. Add an AdListener to Get Specific Failure Details #

The generic "Ad did not load" toast doesn't tell you what went wrong. Adding an AdListener will give you a precise error code to diagnose the issue:

• ERROR_CODE_NO_FILL: No ad inventory is available (rare with test IDs, but common with unapproved live IDs)
• ERROR_CODE_NETWORK_ERROR: Device has no stable internet connection
• ERROR_CODE_INVALID_REQUEST: Invalid AdUnit ID or malformed request
• ERROR_CODE_INTERNAL_ERROR: AdMob SDK encountered an unexpected issue

3. Verify Your AdUnit ID #

• For testing, use AdMob's official test interstitial ID: ca-app-pub-3940256099942544/1033173712 (this guarantees test ads will load if everything else is set up correctly)
• Double-check that the value in strings.xml for interstitial_ad_unit_id is spelled correctly and matches your AdMob dashboard (if using a live ID)

4. Confirm Required Permissions #

Make sure these permissions are added to your AndroidManifest.xml:

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

5. Check Your SDK Dependency #

Ensure you're using a recent version of the Google Mobile Ads SDK in your module-level build.gradle:

dependencies {
    implementation 'com.google.android.gms:play-services-ads:22.6.0' // Use the latest version available
}

Full Working Example Code #

Here's how to update your Ads class with all the necessary pieces:

public class Ads extends AppCompatActivity {
    PublisherInterstitialAd mPublisherInterstitialAd;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_ads); // Replace with your actual layout

        mPublisherInterstitialAd = new PublisherInterstitialAd(this);
        mPublisherInterstitialAd.setAdUnitId(getString(R.string.interstitial_ad_unit_id));

        // Set up listener to track ad status
        mPublisherInterstitialAd.setAdListener(new AdListener() {
            @Override
            public void onAdLoaded() {
                Toast.makeText(Ads.this, "Ad loaded successfully!", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onAdFailedToLoad(int errorCode) {
                String errorMessage = switch(errorCode) {
                    case AdRequest.ERROR_CODE_INTERNAL_ERROR -> "Internal SDK error";
                    case AdRequest.ERROR_CODE_INVALID_REQUEST -> "Invalid AdUnit ID or request";
                    case AdRequest.ERROR_CODE_NETWORK_ERROR -> "Network connection issue";
                    case AdRequest.ERROR_CODE_NO_FILL -> "No ads available right now";
                    default -> "Unknown error";
                };
                Toast.makeText(Ads.this, "Ad failed to load: " + errorMessage, Toast.LENGTH_LONG).show();
            }

            @Override
            public void onAdClosed() {
                // Reload ad after closing for next use
                loadInterstitialAd();
            }
        });

        // Trigger the ad load
        loadInterstitialAd();
    }

    private void loadInterstitialAd() {
        AdRequest adRequest = new AdRequest.Builder().build();
        mPublisherInterstitialAd.loadAd(adRequest);
    }

    // Example method to show ad when a button is clicked
    public void showAd(View view) {
        if (mPublisherInterstitialAd.isLoaded()) {
            mPublisherInterstitialAd.show();
        } else {
            Toast.makeText(this, "Ad not ready yet—reloading!", Toast.LENGTH_SHORT).show();
            loadInterstitialAd();
        }
    }
}

内容的提问来源于stack exchange，提问作者Anna Kalinina