处理自适应展示广告

创建条件为Type = RESPONSIVE_DISPLAY_AD的广告迭代器将 目前仅对旧版广告进行迭代。此条件已弃用；拜托 更新现有代码以明确使用 Type = LEGACY_RESPONSIVE_DISPLAY_AD。如需针对支持多项文字、图片和视频素材资源的广告创建广告迭代器，请使用条件 Type = MULTI_ASSET_RESPONSIVE_DISPLAY_AD。

以下代码段展示了这两种自适应展示广告之间的一些 API 差异和相似之处。如需了解详情，请参阅自适应展示广告参考文档。

// let legacyRdaIterator = AdsApp.ads().withCondition("Type = RESPONSIVE_DISPLAY_AD").get();
let legacyRdaIterator = AdsApp.ads().withCondition("Type = LEGACY_RESPONSIVE_DISPLAY_AD").get();
while (legacyRdaIterator.hasNext()) {
  let responsiveDisplayAd = legacyRdaIterator.next().asType().responsiveDisplayAd();

  // Legacy responsive display ads have just one long headline.
  let longHeadline = responsiveDisplayAd.getLongHeadline();

  // And they have one short headline, too.
  let shortHeadline = responsiveDisplayAd.getShortHeadline();

  // This call to .getHeadlines() returns null, because the method is not
  // meaningful when called on a legacy responsive display ad.
  assert(responsiveDisplayAd.getHeadlines() === null);

  // ... etc. ...
}

let rdaIterator = AdsApp.ads().withCondition("Type = MULTI_ASSET_RESPONSIVE_DISPLAY_AD").get();
while (rdaIterator.hasNext()) {
  let responsiveDisplayAd = rdaIterator.next().asType().responsiveDisplayAd();

  // Responsive display ads have just one long headline.
  let longHeadline = responsiveDisplayAd.getLongHeadline();

  // But they can have multiple short headline text assets.
  let shortHeadlineAssets = responsiveDisplayAd.getHeadlines();

  // This call to .getShortHeadline() returns null, because the method is only
  // meaningful when called on a legacy responsive display ad.
  assert(responsiveDisplayAd.getShortHeadline() === null);

  // ... etc. ...
}

let rdaAndLegacyIterator = AdsApp.ads().withCondition("Type IN [LEGACY_RESPONSIVE_DISPLAY_AD, MULTI_ASSET_RESPONSIVE_DISPLAY_AD]").get();
while (rdaAndLegacyIterator.hasNext()) {
  let responsiveDisplayAd = legacyRdaIterator.next().asType().responsiveDisplayAd();
  let longHeadline = responsiveDisplayAd.getLongHeadline();

  // The .isLegacy() method can be used to differentiate between responsive
  // display ad types within an iterator over both.
  if (responsiveDisplayAd.isLegacy()) {
    let shortHeadline = responsiveDisplayAd.getShortHeadline();
    // ... etc. ...
  } else {
    let shortHeadlineAssets = responsiveDisplayAd.getHeadlines();
    // ... etc. ...
  }
}