本頁面由 Cloud Translation API 翻譯而成。

獎勵廣告自訂事件

必要條件

索取獎勵廣告

當瀑布式中介鏈中到達自訂事件明細時，系統會根據您在建立自訂事件時提供的類別名稱，呼叫 loadRewardedAd() 方法。在本例中，該方法位於 SampleCustomEvent 中，然後呼叫 SampleRewardedCustomEventLoader 中的 loadRewardedAd() 方法。

如要要求獎勵廣告，請建立或修改可延伸 Adapter 的類別，以便實作 loadRewardedAd()。此外，請建立新類別來實作 MediationRewardedAd。

在自訂事件範例中，SampleCustomEvent 會擴充 Adapter 類別，然後委派至 SampleRewardedCustomEventLoader。

Java

package com.google.ads.mediation.sample.customevent;

import com.google.android.gms.ads.mediation.Adapter;
import com.google.android.gms.ads.mediation.MediationRewardedAdConfiguration;
import com.google.android.gms.ads.mediation.MediationAdConfiguration;
import com.google.android.gms.ads.mediation.MediationAdLoadCallback;
import com.google.android.gms.ads.mediation.MediationRewardedAd;
import com.google.android.gms.ads.mediation.MediationRewardedAdCallback;
...

public class SampleCustomEvent extends Adapter {

  private SampleNativeCustomEventLoader nativeLoader;

  @Override
  public void loadRewardedAd(
      @NonNull MediationRewardedAdConfiguration mediationRewardedAdConfiguration,
      @NonNull
          MediationAdLoadCallback<MediationRewardedAd, MediationRewardedAdCallback>
              mediationAdLoadCallback) {
    rewardedLoader =
        new SampleRewardedCustomEventLoader(
            mediationRewardedAdConfiguration, mediationAdLoadCallback);
    rewardedLoader.loadAd();
  }
}

SampleRewardedCustomEventLoader 負責執行以下工作：

載入獎勵廣告
實作 MediationRewardedAd 介面。
接收並回報廣告事件回呼至 Google Mobile Ads SDK

AdMob 使用者介面中定義的選用參數會納入廣告設定。您可以透過 adConfiguration.getServerParameters().getString(MediationConfiguration.CUSTOM_EVENT_SERVER_PARAMETER_FIELD) 存取此參數。這個參數通常是廣告聯播網 SDK 在例項化廣告物件時所需的廣告單元 ID。

Java

package com.google.ads.mediation.sample.customevent;

import com.google.android.gms.ads.mediation.Adapter;
import com.google.android.gms.ads.mediation.MediationRewardedAdConfiguration;
import com.google.android.gms.ads.mediation.MediationAdLoadCallback;
import com.google.android.gms.ads.mediation.MediationRewardedAd;
import com.google.android.gms.ads.mediation.MediationRewardedAdCallback;
...

public class SampleRewardedCustomEventLoader extends SampleRewardedAdListener
    implements MediationRewardedAd {

  /** Configuration for requesting the rewarded ad from the third-party network. */
  private final MediationRewardedAdConfiguration mediationRewardedAdConfiguration;

  /**
   * A {@link MediationAdLoadCallback} that handles any callback when a Sample
   * rewarded ad finishes loading.
   */
  private final MediationAdLoadCallback<MediationRewardedAd, MediationRewardedAdCallback>
      mediationAdLoadCallback;

  /** Callback for rewarded ad events. */
  private MediationRewardedAdCallback rewardedAdCallback;

  /** Constructor. */
  public SampleRewardedCustomEventLoader(
      @NonNull MediationRewardedAdConfiguration mediationRewardedAdConfiguration,
      @NonNull MediationAdLoadCallback<MediationRewardedAd, MediationRewardedAdCallback>
              mediationAdLoadCallback) {
    this.mediationRewardedAdConfiguration = mediationRewardedAdConfiguration;
    this.mediationAdLoadCallback = mediationAdLoadCallback;
  }

  /** Loads the rewarded ad from the third-party ad network. */
  public void loadAd() {
    // All custom events have a server parameter named "parameter" that returns
    // back the parameter entered into the AdMob UI when defining the custom event.
    Log.i("RewardedCustomEvent", "Begin loading rewarded ad.");
    String serverParameter = mediationRewardedAdConfiguration
        .getServerParameters()
        .getString(MediationConfiguration
        .CUSTOM_EVENT_SERVER_PARAMETER_FIELD);
    Log.d("RewardedCustomEvent", "Received server parameter.");
    SampleAdRequest request = createSampleRequest(mediationRewardedAdConfiguration);
    sampleRewardedAd = new SampleRewardedAd(serverParameter);
    sampleRewardedAd.setListener(this);
    Log.i("RewardedCustomEvent", "Start fetching rewarded ad.");
    sampleRewardedAd.loadAd(request);
  }

  public SampleAdRequest createSampleRequest(
      MediationAdConfiguration mediationAdConfiguration) {
    SampleAdRequest request = new SampleAdRequest();
    request.setTestMode(mediationAdConfiguration.isTestRequest());
    request.setKeywords(mediationAdConfiguration.getMediationExtras().keySet());
    return request;
  }
}

視廣告是否成功擷取或是否發生錯誤而定，您可以呼叫 onSuccess() 或 onFailure()。您可以傳入實作 MediationRewardedAd 的類別例項，呼叫 onSuccess()。

一般來說，這些方法會在轉接程式實作的第三方 SDK 回呼中實作。在本例中，Sample SDK 有 SampleAdListener 和相關的回呼：

Java

@Override
public void onRewardedAdLoaded() {
  rewardedAdCallback = mediationAdLoadCallback.onSuccess(this);
}

@Override
public void onRewardedAdFailedToLoad(SampleErrorCode errorCode) {
    mediationAdLoadCallback.onFailure(SampleCustomEventError.createSampleSdkError(errorCode));
}

MediationRewardedAd 需要實作 showAd() 方法才能顯示廣告：

Java

@Override
public void showAd(Context context) {
  if (!(context instanceof Activity)) {
    rewardedAdCallback.onAdFailedToShow(
        SampleCustomEventError.createCustomEventNoActivityContextError());
    return;
  }
  Activity activity = (Activity) context;

  if (!sampleRewardedAd.isAdAvailable()) {
    rewardedAdCallback.onAdFailedToShow(
        SampleCustomEventError.createCustomEventAdNotAvailableError());
    return;
  }
  sampleRewardedAd.showAd(activity);
}

將中介服務事件轉送至 Google Mobile Ads SDK

呼叫 onSuccess() 後，轉接器就能使用傳回的 MediationRewardedAdCallback 物件，將來自第三方 SDK 的呈現事件轉送至 Google Mobile Ads SDK。SampleRewardedCustomEventLoader 類別會擴充 SampleAdListener 介面，將來自範例廣告聯播網的回呼轉送至 Google Mobile Ads SDK。

請務必盡可能轉寄這些回呼，讓應用程式從 Google Mobile Ads SDK 接收這些對等事件。以下是使用回呼的範例：

Java

@Override
public void onAdRewarded(final String rewardType, final int amount) {
  RewardItem rewardItem =
      new RewardItem() {
        @Override
        public String getType() {
          return rewardType;
        }

        @Override
        public int getAmount() {
          return amount;
        }
      };
  rewardedAdCallback.onUserEarnedReward(rewardItem);
}

@Override
public void onAdClicked() {
  rewardedAdCallback.reportAdClicked();
}

@Override
public void onAdFullScreen() {
  rewardedAdCallback.onAdOpened();
  rewardedAdCallback.onVideoStart();
  rewardedAdCallback.reportAdImpression();
}

@Override
public void onAdClosed() {
  rewardedAdCallback.onAdClosed();
}

@Override
public void onAdCompleted() {
  rewardedAdCallback.onVideoComplete();
}

這就完成了獎勵廣告的自訂事件實作。您可以在 GitHub 上取得完整範例。您可以將其與已支援的廣告聯播網搭配使用，也可以修改該廣告活動，以便顯示自訂事件獎勵廣告。