插页式广告自定义事件

前提条件

完成自定义事件设置。

请求插页式广告

当到达广告瀑布流中介链中的自定义事件订单项时，系统会对您在创建自定义事件时提供的类名称调用 loadInterstitialAd() 方法。在这种情况下，该方法位于 SampleCustomEvent 中，后者随后会调用 SampleInterstitialCustomEventLoader 中的 loadInterstitialAd() 方法。

如需请求插页式广告，请创建或修改一个扩展 Adapter 以实现 loadInterstitialAd() 的类。此外，请创建一个新类来实现 MediationInterstitialAd。

在我们的自定义事件示例中，SampleCustomEvent 会扩展 Adapter 类，然后委托给 SampleInterstitialCustomEventLoader。

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

import com.google.android.gms.ads.mediation.Adapter;
import com.google.android.gms.ads.mediation.MediationAdConfiguration;
import com.google.android.gms.ads.mediation.MediationAdLoadCallback;
import com.google.android.gms.ads.mediation.MediationInterstitialAd;
import com.google.android.gms.ads.mediation.MediationInterstitialAdCallback;
...

public class SampleCustomEvent extends Adapter {
  private SampleInterstitialCustomEventLoader interstitialLoader;
  @Override
  public void loadInterstitialAd(
      @NonNull MediationInterstitialAdConfiguration adConfiguration,
      @NonNull
          MediationAdLoadCallback<MediationInterstitialAd, MediationInterstitialAdCallback>
              callback) {
    interstitialLoader = new SampleInterstitialCustomEventLoader(adConfiguration, callback);
    interstitialLoader.loadAd();
  }
}

SampleInterstitialCustomEventLoader 负责执行以下任务：

• 加载插页式广告并在加载完成后调用 MediationAdLoadCallback 方法。

• 实现 MediationInterstitialAd 接口。

• 接收广告事件回调并报告给 Google 移动广告 SDK

AdMob 界面中定义的可选参数包含在广告配置中。此参数可通过 adConfiguration.getServerParameters().getString(MediationConfiguration.CUSTOM_EVENT_SERVER_PARAMETER_FIELD) 进行访问。通常，此参数是实例化广告对象时广告联盟 SDK 所需的广告单元标识符。

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

import com.google.android.gms.ads.mediation.Adapter;
import com.google.android.gms.ads.mediation.MediationInterstitialAdConfiguration;
import com.google.android.gms.ads.mediation.MediationAdLoadCallback;
import com.google.android.gms.ads.mediation.MediationInterstitialAd;
import com.google.android.gms.ads.mediation.MediationInterstitialAdCallback;
...

public class SampleInterstitialCustomEventLoader extends SampleAdListener
    implements MediationInterstitialAd {

  /** A sample third-party SDK interstitial ad. */
  private SampleInterstitial sampleInterstitialAd;

  /** Configuration for requesting the interstitial ad from the third-party network. */
  private final MediationInterstitialAdConfiguration mediationInterstitialAdConfiguration;

  /** Callback for interstitial ad events. */
  private MediationInterstitialAdCallback interstitialAdCallback;

  /** Callback that fires on loading success or failure. */
  private final MediationAdLoadCallback<MediationInterstitialAd, MediationInterstitialAdCallback>
      mediationAdLoadCallback;

  /** Constructor. */
  public SampleInterstitialCustomEventLoader(
      @NonNull MediationInterstitialAdConfiguration mediationInterstitialAdConfiguration,
      @NonNull MediationAdLoadCallback<MediationInterstitialAd, MediationInterstitialAdCallback>
              mediationAdLoadCallback) {
    this.mediationInterstitialAdConfiguration = mediationInterstitialAdConfiguration;
    this.mediationAdLoadCallback = mediationAdLoadCallback;
  }

  /** Loads the interstitial 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 UI when defining the custom event.
    Log.i("InterstitialCustomEvent", "Begin loading interstitial ad.");
    String serverParameter = mediationInterstitialAdConfiguration.getServerParameters().getString(
        MediationConfiguration.CUSTOM_EVENT_SERVER_PARAMETER_FIELD);
    Log.d("InterstitialCustomEvent", "Received server parameter.");

    sampleInterstitialAd =
        new SampleInterstitial(mediationInterstitialAdConfiguration.getContext());
    sampleInterstitialAd.setAdUnit(serverParameter);

    // Implement a SampleAdListener and forward callbacks to mediation.
    sampleInterstitialAd.setAdListener(this);

    // Make an ad request.
    Log.i("InterstitialCustomEvent", "start fetching interstitial ad.");
    sampleInterstitialAd.fetchAd(
        SampleCustomEvent.createSampleRequest(mediationInterstitialAdConfiguration));
  }

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

根据广告是成功提取还是遇到错误，您可以调用 onSuccess() 或 onFailure()。通过传入实现 MediationInterstitialAd 的类的实例调用 onSuccess()。

通常，这些方法是在您的适配器所实现的第三方 SDK 的回调中实现的。在此示例中，示例 SDK 具有一个 SampleAdListener 及相关回调：

@Override
public void onAdFetchSucceeded() {
  interstitialAdCallback = mediationAdLoadCallback.onSuccess(this);
}

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

MediationInterstitialAd 需要实现 showAd() 方法才能展示广告：

@Override
public void showAd(@NonNull Context context) {
  sampleInterstitialAd.show();
}

将中介事件转发至 Google 移动广告 SDK

调用 onSuccess() 后，适配器便可以使用返回的 MediationInterstitialAdCallback 对象，将展示事件从第三方 SDK 转发至 Google 移动广告 SDK。SampleInterstitialCustomEventLoader 类扩展了 SampleAdListener 接口，以将回调从示例广告联盟转发到 Google 移动广告 SDK。

您的自定义事件必须尽可能多地转发这些回调，以便您的应用从 Google 移动广告 SDK 接收这些等效事件。以下示例展示了如何使用回调：

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

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

到这里，我们已经实现针对插页式广告的自定义事件。GitHub 上提供了完整的示例。您可在已获支持的广告联盟上直接使用这些示例代码，也可在修改后用于展示自定义事件插页式广告。