横幅广告自定义事件

前提条件

完成自定义事件设置。

请求横幅广告

当广告瀑布流中介链到达自定义事件订单项时，系统将根据您在创建自定义事件时提供的类名称调用the loadBannerAd() method 。在这种情况下，该方法位于 SampleCustomEvent 中，后者随后会在 SampleBannerCustomEventLoader中调用the loadBannerAd() method 。

若要请求横幅广告，请创建或修改一个扩展 Adapter 的类以实现 loadBannerAd()。此外，请创建一个新类来实现 MediationBannerAd。

在我们的自定义事件示例中，SampleCustomEvent 会实现the Adapter interface ，然后委托给SampleBannerCustomEventLoader。

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.MediationBannerAd;
import com.google.android.gms.ads.mediation.MediationBannerAdCallback;
...

public class SampleCustomEvent extends Adapter {
  private SampleBannerCustomEventLoader bannerLoader;
  @Override
  public void loadBannerAd(
      @NonNull MediationBannerAdConfiguration adConfiguration,
      @NonNull MediationAdLoadCallback<MediationBannerAd, MediationBannerAdCallback> callback) {
    bannerLoader = new SampleBannerCustomEventLoader(adConfiguration, callback);
    bannerLoader.loadAd();
  }
}

SampleBannerCustomEventLoader 负责以下任务：

• 加载完成后，加载横幅广告并调用MediationAdLoadCallback method

• 实现 MediationBannerAd interface

• 接收广告事件回调并将其报告给 Google 移动广告 SDK

界面中定义的可选参数包含在广告配置中。 AdMob 您可以通过 adConfiguration.getServerParameters().getString(MediationConfiguration.CUSTOM_EVENT_SERVER_PARAMETER_FIELD) 访问该参数。此参数通常是实例化广告对象时广告网络 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.MediationBannerAdConfiguration;
import com.google.android.gms.ads.mediation.MediationAdLoadCallback;
import com.google.android.gms.ads.mediation.MediationBannerAd;
import com.google.android.gms.ads.mediation.MediationBannerAdCallback;
...

public class SampleBannerCustomEventLoader extends SampleAdListener implements MediationBannerAd {

  /** View to contain the sample banner ad. */
  private SampleAdView sampleAdView;

  /** Configuration for requesting the banner ad from the third-party network. */
  private final MediationBannerAdConfiguration mediationBannerAdConfiguration;

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

  /** Callback for banner ad events. */
  private MediationBannerAdCallback bannerAdCallback;

  /** Constructor. */
  public SampleBannerCustomEventLoader(
      @NonNull MediationBannerAdConfiguration mediationBannerAdConfiguration,
      @NonNull MediationAdLoadCallback<MediationBannerAd, MediationBannerAdCallback>
              mediationAdLoadCallback) {
    this.mediationBannerAdConfiguration = mediationBannerAdConfiguration;
    this.mediationAdLoadCallback = mediationAdLoadCallback;
  }

  /** Loads a banner 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("BannerCustomEvent", "Begin loading banner ad.");
    String serverParameter =
        mediationBannerAdConfiguration.getServerParameters().getString(
        MediationConfiguration.CUSTOM_EVENT_SERVER_PARAMETER_FIELD);

    Log.d("BannerCustomEvent", "Received server parameter.");

    Context context = mediationBannerAdConfiguration.getContext();
    sampleAdView = new SampleAdView(context);

    // Assumes that the serverParameter is the ad unit of the Sample Network.
    sampleAdView.setAdUnit(serverParameter);
    AdSize size = mediationBannerAdConfiguration.getAdSize();

    // Internally, smart banners use constants to represent their ad size, which
    // means a call to AdSize.getHeight could return a negative value. You can
    // accommodate this by using AdSize.getHeightInPixels and
    // AdSize.getWidthInPixels instead, and then adjusting to match the device's
    // display metrics.
    int widthInPixels = size.getWidthInPixels(context);
    int heightInPixels = size.getHeightInPixels(context);
    DisplayMetrics displayMetrics = Resources.getSystem().getDisplayMetrics();
    int widthInDp = Math.round(widthInPixels / displayMetrics.density);
    int heightInDp = Math.round(heightInPixels / displayMetrics.density);

    sampleAdView.setSize(new SampleAdSize(widthInDp, heightInDp));
    sampleAdView.setAdListener(this);

    SampleAdRequest request = createSampleRequest(mediationBannerAdConfiguration);
    Log.i("BannerCustomEvent", "Start fetching banner ad.");
    sampleAdView.fetchAd(request);
  }

  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 MediationBannerAd 的类的实例来调用 onSuccess()。

通常，这些方法是在适配器实现的第三方 SDK 的回调内实现的。在此示例中，示例 SDK 具有包含相关回调的 SampleAdListener：

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

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

MediationBannerAd 需要实现 View getter 方法：

@Override
@NonNull
public View getView() {
  return sampleAdView;
}

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 MediationBannerAdCallback 对象，将展示事件从第三方 SDK 转发到 Google 移动广告 SDK。SampleBannerCustomEventLoader 类扩展 SampleAdListener 接口，可将回调从示例广告联盟转发到 Google 移动广告 SDK。

请务必确保您的自定义事件转发尽可能多的回调，以便您的应用从 Google 移动广告 SDK 接收这些等效事件。以下是使用回调的示例：

@Override
public void onAdFullScreen() {
  bannerAdCallback.onAdOpened();
  bannerAdCallback.reportAdClicked();
}

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

到这里，横幅广告的自定义事件实现即告完成。GitHub 上提供了完整的示例。您可以将其用于已支持的广告联盟，也可以对其进行修改以展示自定义事件横幅广告。