本頁面由 Cloud Translation API 翻譯而成。

原生進階

選取平台： Android iOS

顯示 NativeAd

原生廣告載入時，Google Mobile Ads SDK 會為對應的廣告格式叫用事件監聽器。接著，您的應用程式負責顯示廣告，但不一定需要立即顯示。為讓您更輕鬆地顯示系統定義的廣告格式，SDK 提供一些實用資源，如下所述。

定義 `NativeAdView` 類別

定義 NativeAdView 類別。這個類別是 ViewGroup 類別，也是 NativeAdView 類別的頂層容器。每個原生廣告視圖都包含原生廣告素材資源，例如 MediaView 視圖元素或 Title 視圖元素，這些元素必須是 NativeAdView 物件的子項。

XML 版面配置

在專案中新增 XML NativeAdView：

<com.google.android.gms.ads.nativead.NativeAdView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <LinearLayout
    android:orientation="vertical">
        <LinearLayout
        android:orientation="horizontal">
          <ImageView
          android:id="@+id/ad_app_icon" />
          <TextView
            android:id="@+id/ad_headline" />
        </LinearLayout>
        <!--Add remaining assets such as the image and media view.-->
    </LinearLayout>
</com.google.android.gms.ads.nativead.NativeAdView>

Jetpack Compose

加入 JetpackComposeDemo/compose-util 模組，其中包含用於排版 NativeAdView 及其資產的輔助程式。

使用 compose-util 模組，編寫 NativeAdView：

  import com.google.android.gms.compose_util.NativeAdAttribution
  import com.google.android.gms.compose_util.NativeAdView

  @Composable
  /** Display a native ad with a user defined template. */
  fun DisplayNativeAdView(nativeAd: NativeAd) {
      NativeAdView {
          // Display the ad attribution.
          NativeAdAttribution(text = context.getString("Ad"))
          // Add remaining assets such as the image and media view.
        }
    }

處理已載入的原生廣告

原生廣告載入時，請處理回呼事件、展開原生廣告視圖，然後將其新增至檢視階層：

Java

AdLoader.Builder builder = new AdLoader.Builder(this, "ca-app-pub-3940256099942544/2247696110")
    .forNativeAd(new NativeAd.OnNativeAdLoadedListener() {
        @Override
        public void onNativeAdLoaded(NativeAd nativeAd) {
            // Assumes you have a placeholder FrameLayout in your View layout
            // (with ID fl_adplaceholder) where the ad is to be placed.
            FrameLayout frameLayout =
                findViewById(R.id.fl_adplaceholder);
            // Assumes that your ad layout is in a file call native_ad_layout.xml
            // in the res/layout folder
            NativeAdView adView = (NativeAdView) getLayoutInflater()
                .inflate(R.layout.native_ad_layout, null);
            // This method sets the assets into the ad view.
            populateNativeAdView(nativeAd, adView);
            frameLayout.removeAllViews();
            frameLayout.addView(adView);
        }
});

Kotlin

val builder = AdLoader.Builder(this, "ca-app-pub-3940256099942544/2247696110")
    .forNativeAd { nativeAd ->
        // Assumes you have a placeholder FrameLayout in your View layout
        // (with ID fl_adplaceholder) where the ad is to be placed.
        val frameLayout: FrameLayout = findViewById(R.id.fl_adplaceholder)
        // Assumes that your ad layout is in a file call native_ad_layout.xml
        // in the res/layout folder
        val adView = layoutInflater
                .inflate(R.layout.native_ad_layout, null) as NativeAdView
        // This method sets the assets into the ad view.
        populateNativeAdView(nativeAd, adView)
        frameLayout.removeAllViews()
        frameLayout.addView(adView)
    }

Jetpack Compose

@Composable
/** Load and display a native ad. */
fun NativeScreen() {
  var nativeAd by remember { mutableStateOf<NativeAd?>(null) }
  val context = LocalContext.current
  var isDisposed by remember { mutableStateOf(false) }

  DisposableEffect(Unit) {
    // Load the native ad when we launch this screen
    loadNativeAd(
      context = context,
      onAdLoaded = { ad ->
        // Handle the native ad being loaded.
        if (!isDisposed) {
          nativeAd = ad
        } else {
          // Destroy the native ad if loaded after the screen is disposed.
          ad.destroy()
        }
      },
    )
    // Destroy the native ad to prevent memory leaks when we dispose of this screen.
    onDispose {
      isDisposed = true
      nativeAd?.destroy()
      nativeAd = null
    }
  }

  // Display the native ad view with a user defined template.
  nativeAd?.let { adValue -> DisplayNativeAdView(adValue) }
}

fun loadNativeAd(context: Context, onAdLoaded: (NativeAd) -> Unit) {
  val adLoader =
    AdLoader.Builder(context, NATIVE_AD_UNIT_ID)
      .forNativeAd { nativeAd -> onAdLoaded(nativeAd) }
      .withAdListener(
        object : AdListener() {
          override fun onAdFailedToLoad(error: LoadAdError) {
            Log.e(TAG, "Native ad failed to load: ${error.message}")
          }

          override fun onAdLoaded() {
            Log.d(TAG, "Native ad was loaded.")
          }

          override fun onAdImpression() {
            Log.d(TAG, "Native ad recorded an impression.")
          }

          override fun onAdClicked() {
            Log.d(TAG, "Native ad was clicked.")
          }
        }
      )
      .build()
  adLoader.loadAd(AdRequest.Builder().build())
}
NativeScreen.kt

請注意，特定原生廣告的所有素材資源都應在 NativeAdView 版面配置中顯示。當原生素材資源在原生廣告檢視畫面版面配置外顯示時，Google Mobile Ads SDK 會嘗試記錄警告。

廣告檢視畫面類別也提供方法，用於註冊用於個別素材資源的檢視畫面，以及註冊 NativeAd 物件本身。以這種方式註冊檢視畫面可讓 SDK 自動處理下列工作：

記錄點擊
在畫面上顯示第一個像素時，記錄曝光
顯示 AdChoices 重疊廣告

AdChoices 重疊廣告

SDK 會在每個廣告檢視畫面中加入 AdChoices 疊加層。在原生廣告檢視畫面的偏好角落保留空間，以便自動插入 AdChoices 標誌。此外，疊加在廣告中的 AdChoices 標籤必須清楚易見，因此請選用合適的背景顏色和圖片。如要進一步瞭解疊加層的外觀和功能，請參閱原生廣告欄位說明。

廣告歸因

您必須顯示廣告標示，指出觀看次數是廣告。詳情請參閱政策指南。

程式碼範例

顯示原生廣告的步驟如下：

建立 NativeAdView 類別的例項。
針對每項要顯示的廣告素材資源：
1. 使用廣告物件中的素材資源填入素材資源檢視畫面。
2. 使用 NativeAdView 類別註冊素材資源檢視畫面。
如果原生廣告版面配置包含大型媒體素材資源，請註冊 MediaView。
使用 NativeAdView 類別註冊廣告物件。

以下是顯示 NativeAd 的範例函式：

Java

private void displayNativeAd(ViewGroup parent, NativeAd ad) {

  // Inflate a layout and add it to the parent ViewGroup.
  LayoutInflater inflater = (LayoutInflater) parent.getContext()
          .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  NativeAdView adView = (NativeAdView) inflater
          .inflate(R.layout.ad_layout_file, parent);

  // Locate the view that will hold the headline, set its text, and call the
  // NativeAdView's setHeadlineView method to register it.
  TextView headlineView = adView.findViewById<TextView>(R.id.ad_headline);
  headlineView.setText(ad.getHeadline());
  adView.setHeadlineView(headlineView);

  // Repeat the process for the other assets in the NativeAd
  // using additional view objects (Buttons, ImageViews, etc).

  // If the app is using a MediaView, it should be
  // instantiated and passed to setMediaView. This view is a little different
  // in that the asset is populated automatically, so there's one less step.
  MediaView mediaView = (MediaView) adView.findViewById(R.id.ad_media);
  adView.setMediaView(mediaView);

  // Call the NativeAdView's setNativeAd method to register the
  // NativeAdObject.
  adView.setNativeAd(ad);

  // Ensure that the parent view doesn't already contain an ad view.
  parent.removeAllViews();

  // Place the AdView into the parent.
  parent.addView(adView);
}

Kotlin

fun displayNativeAd(parent: ViewGroup, ad: NativeAd) {

  // Inflate a layout and add it to the parent ViewGroup.
  val inflater = parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE)
          as LayoutInflater
  val adView = inflater.inflate(R.layout.ad_layout_file, parent) as NativeAdView

  // Locate the view that will hold the headline, set its text, and use the
  // NativeAdView's headlineView property to register it.
  val headlineView = adView.findViewById<TextView>(R.id.ad_headline)
  headlineView.text = ad.headline
  adView.headlineView = headlineView

  // Repeat the process for the other assets in the NativeAd using
  // additional view objects (Buttons, ImageViews, etc).

  val mediaView = adView.findViewById<MediaView>(R.id.ad_media)
  adView.mediaView = mediaView

  // Call the NativeAdView's setNativeAd method to register the
  // NativeAdObject.
  adView.setNativeAd(ad)

  // Ensure that the parent view doesn't already contain an ad view.
  parent.removeAllViews()

  // Place the AdView into the parent.
  parent.addView(adView)
}

Jetpack Compose

@Composable
/** Display a native ad with a user defined template. */
fun DisplayNativeAdView(nativeAd: NativeAd) {
  val context = LocalContext.current
  Box(modifier = Modifier.padding(8.dp).wrapContentHeight(Alignment.Top)) {
    // Call the NativeAdView composable to display the native ad.
    NativeAdView {
      // Inside the NativeAdView composable, display the native ad assets.
      Column(Modifier.align(Alignment.TopStart).wrapContentHeight(Alignment.Top)) {
        // Display the ad attribution.
        NativeAdAttribution(text = context.getString(R.string.attribution))
        Row {
          // If available, display the icon asset.
          nativeAd.icon?.let { icon ->
            NativeAdIconView(Modifier.padding(5.dp)) {
              icon.drawable?.toBitmap()?.let { bitmap ->
                Image(bitmap = bitmap.asImageBitmap(), "Icon")
              }
            }
          }
          Column {
            // If available, display the headline asset.
            nativeAd.headline?.let {
              NativeAdHeadlineView {
                Text(text = it, style = MaterialTheme.typography.headlineLarge)
              }
            }
            // If available, display the star rating asset.
            nativeAd.starRating?.let {
              NativeAdStarRatingView {
                Text(text = "Rated $it", style = MaterialTheme.typography.labelMedium)
              }
            }
          }
        }

        // If available, display the body asset.
        nativeAd.body?.let { NativeAdBodyView { Text(text = it) } }
        // Display the media asset.
        NativeAdMediaView(Modifier.fillMaxWidth().height(500.dp).fillMaxHeight())

        Row(Modifier.align(Alignment.End).padding(5.dp)) {
          // If available, display the price asset.
          nativeAd.price?.let {
            NativeAdPriceView(Modifier.padding(5.dp).align(Alignment.CenterVertically)) {
              Text(text = it)
            }
          }
          // If available, display the store asset.
          nativeAd.store?.let {
            NativeAdStoreView(Modifier.padding(5.dp).align(Alignment.CenterVertically)) {
              Text(text = it)
            }
          }
          // If available, display the call to action asset.
          // Note: The Jetpack Compose button implements a click handler which overrides the native
          // ad click handler, causing issues. Use the NativeAdButton which does not implement a
          // click handler. To handle native ad clicks, use the NativeAd AdListener onAdClicked
          // callback.
          nativeAd.callToAction?.let { callToAction ->
            NativeAdCallToActionView(Modifier.padding(5.dp)) { NativeAdButton(text = callToAction) }
          }
        }
      }
    }
  }
}
NativeScreen.kt

以下是個別工作：

加載版面配置

Java

LayoutInflater inflater = (LayoutInflater) parent.getContext()
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
NativeAdView adView = (NativeAdView) inflater
        .inflate(R.layout.ad_layout_file, parent);

Kotlin

val inflater = parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE)
        as LayoutInflater
val adView = inflater.inflate(R.layout.ad_layout_file, parent) as NativeAdView

這段程式碼會將 XML 版面配置加載至內含用於顯示原生廣告的檢視畫面，然後找出 NativeAdView 的參照。請注意，如果片段或活動中已有 NativeAdView，您也可以重複使用該 NativeAdView，甚至不使用版面配置檔案，也可以動態建立例項。

填入並註冊資產檢視畫面

這個範例程式碼會找出用於顯示標題的檢視畫面，並使用廣告物件提供的字串素材資源設定文字，然後將其註冊至 NativeAdView 物件：
Java
```
TextView headlineView = adView.findViewById<TextView>(R.id.ad_headline);
headlineView.setText(ad.getHeadline());
adView.setHeadlineView(headlineView);
```
Kotlin
```
val headlineView = adView.findViewById<TextView>(R.id.ad_headline)
headlineView.text = ad.headline
adView.headlineView = headlineView
```
對於應用程式要顯示的原生廣告物件提供的每個素材資源，都應重複執行這個尋找檢視畫面、設定其值，以及向廣告檢視畫面類別註冊的程序。

處理點擊

請勿在原生廣告檢視畫面內或上方的任何檢視畫面中，實作任何自訂點擊處理常式。只要您正確填入及註冊素材資源檢視畫面 (如前一個部分所述)，SDK 就會處理廣告檢視畫面素材資源的點擊次數。

如要接收點擊事件，請實作 Google Mobile Ads SDK 點擊回呼：

Java

AdLoader adLoader = new AdLoader.Builder(context, "ca-app-pub-3940256099942544/2247696110")
    // ...
    .withAdListener(new AdListener() {
        @Override
        public void onAdFailedToLoad(LoadAdError adError) {
            // Handle the failure by logging.
        }
        @Override
        public void onAdClicked() {
            // Log the click event or other custom behavior.
        }
    })
    .build();

Kotlin

val adLoader = AdLoader.Builder(this, "ca-app-pub-3940256099942544/2247696110")
    // ...
    .withAdListener(object : AdListener() {
        override fun onAdFailedToLoad(adError: LoadAdError) {
            // Handle the failure.
        }
        override fun onAdClicked() {
            // Log the click event or other custom behavior.
        }
    })
    .build()

註冊 MediaView

如要在原生廣告版面配置中包含主要圖片素材資源，必須使用 MediaView 素材資源，而不是 ImageView 素材資源。

MediaView 是專門用於顯示主要媒體素材資源 (影片或圖片) 的特殊 View。

MediaView 可在 XML 版面配置中定義，也可以動態建構。它應放置在 NativeAdView 的檢視區塊階層中，就像任何其他資產檢視畫面一樣。使用 MediaView 的應用程式必須向 NativeAdView 註冊：
Java
```
 // Populate and register the media asset view.
 nativeAdView.setMediaView(nativeAdBinding.adMedia);
```
Kotlin
```
 // Populate and register the media asset view.
 nativeAdView.mediaView = nativeAdBinding.adMedia
```
ImageScaleType

MediaView 類別在顯示圖片時具有 ImageScaleType 屬性。如要變更圖片在 MediaView 中的縮放方式，請使用 MediaView 的 setImageScaleType() 方法設定對應的 ImageView.ScaleType：
Java
```
mediaView.setImageScaleType(ImageView.ScaleType.CENTER_CROP);
```
Kotlin
```
mediaView.imageScaleType = ImageView.ScaleType.CENTER_CROP
```
MediaContent

MediaContent 類別會保留與原生廣告媒體內容相關的資料，並使用 MediaView 類別顯示。當 MediaView mediaContent 屬性設為 MediaContent 例項時：
- 如果有可用的影片素材資源，系統會進行緩衝，並開始在 MediaView 中播放。您可以檢查 hasVideoContent()，判斷影片素材資源是否可用。
- 如果廣告不含影片素材資源，系統會下載 mainImage 素材資源，並將其放入 MediaView 中。
根據預設，mainImage 是第一個下載的圖片素材資源。如果使用 setReturnUrlsForImageAssets(true)，mainImage 就是 null，您必須將 mainImage 屬性設為手動下載的圖片。請注意，只有在沒有可用的影片素材資源時，系統才會使用這張圖片。
註冊原生廣告物件

這個最後步驟會將原生廣告物件註冊至負責顯示廣告的檢視畫面。
Java
```
adView.setNativeAd(ad);
```
Kotlin
```
adView.setNativeAd(ad)
```

銷毀廣告

原生廣告顯示完畢後，您應將其銷毀，以便系統正確進行垃圾收集。

Java

nativeAd.destroy();

Kotlin

nativeAd.destroy()

GitHub 上的範例

完整的原生廣告實作範例：

Java Kotlin JetpackCompose

後續步驟

請參閱下列主題：

使用者隱私權

最佳化 SDK 初始化和廣告載入 (Beta 版)

原生進階 透過集合功能整理內容 你可以依據偏好儲存及分類內容。

顯示 NativeAd

定義 NativeAdView 類別

XML 版面配置

Jetpack Compose

處理已載入的原生廣告

Java

Kotlin

Jetpack Compose

AdChoices 重疊廣告

廣告歸因

程式碼範例

Java

Kotlin

Jetpack Compose

Java

Kotlin

Java

Kotlin

Java

Kotlin

Java

Kotlin

ImageScaleType

Java

Kotlin

MediaContent

Java

Kotlin

銷毀廣告

Java

Kotlin

GitHub 上的範例

後續步驟

原生進階

定義 `NativeAdView` 類別