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本頁面由 Cloud Translation API 翻譯而成。

應用程式開啟頁面廣告

選取平台： Android iOS Unity Flutter

本指南適用於使用 Google Mobile Ads SDK 整合應用程式開啟頁面廣告的發布商。

應用程式開啟頁面廣告是一種特殊廣告格式，適合希望藉由應用程式載入畫面賺取收益的發布商。應用程式開啟頁面廣告會在使用者將應用程式切換至前景時出現，而且使用者隨時可以關閉。

應用程式開啟頁面廣告會自動保留一小塊畫面，向使用者顯示應用程式的品牌資訊。以下是應用程式開啟頁面廣告的範例：

必要條件

完成入門指南。

一律使用測試廣告進行測試

建構及測試應用程式時，請務必使用測試廣告，而非實際的正式廣告。否則帳戶可能會遭到停權。

如要載入測試廣告，最簡單的方法是使用應用程式開頭廣告專用的測試廣告單元 ID：

ca-app-pub-3940256099942544/9257395921

這個 ID 經過特別設定，可針對每項要求傳回測試廣告，您可以在編寫、測試及偵錯時，自由地在自己的應用程式中使用。發布應用程式前，請務必將其替換為您自己的廣告單元 ID。

如要進一步瞭解 Google Mobile Ads SDK 測試廣告的運作方式，請參閱「啟用測試廣告」。

擴充 Application 類別

建立擴充 Application 類別的新類別，並在應用程式啟動時加入下列程式碼，初始化 Google Mobile Ads SDK。

Java

/** Application class that initializes, loads and show ads when activities change states. */
public class MyApplication extends Application {

  @Override
  public void onCreate() {
    super.onCreate();
    new Thread(
            () -> {
              // Initialize the Google Mobile Ads SDK on a background thread.
              MobileAds.initialize(this, initializationStatus -> {});
            })
        .start();
  }
}

Kotlin

/** Application class that initializes, loads and show ads when activities change states. */
class MyApplication : Application() {

  override fun onCreate() {
    super.onCreate()
    val backgroundScope = CoroutineScope(Dispatchers.IO)
    backgroundScope.launch {
      // Initialize the Google Mobile Ads SDK on a background thread.
      MobileAds.initialize(this@MyApplication) {}
    }
  }
}

這會初始化 SDK，並提供骨架，您稍後將註冊應用程式前景事件。

接著，將下列程式碼新增至 AndroidManifest.xml：

<!-- TODO: Update to reference your actual package name. -->
<application
    android:name="com.google.android.gms.example.appopendemo.MyApplication" ...>
...
</application>

實作公用程式元件

廣告應能快速顯示，因此最好在需要顯示廣告前載入廣告。這樣一來，使用者進入應用程式後，您就能立即放送廣告。

導入公用程式元件 AppOpenAdManager，在需要顯示廣告前提出廣告請求。

Java

public class MyApplication extends Application {
  // ...
  /** Inner class that loads and shows app open ads. */
  private class AppOpenAdManager {
    private static final String LOG_TAG = "AppOpenAdManager";
    private static final String AD_UNIT_ID = "ca-app-pub-3940256099942544/9257395921";

    private AppOpenAd appOpenAd = null;
    private boolean isLoadingAd = false;
    private boolean isShowingAd = false;

    /** Constructor. */
    public AppOpenAdManager() {}

    /** Request an ad. */
    private void loadAd(Context context) {
      // We will implement this later.
    }

    /** Check if ad exists and can be shown. */
    private boolean isAdAvailable() {
      return appOpenAd != null;
    }
  }
}

Kotlin

private const val String LOG_TAG = "AppOpenAdManager"
private const val String AD_UNIT_ID = "ca-app-pub-3940256099942544/9257395921"

public class MyApplication extends Application {
  // ...
  /** Inner class that loads and shows app open ads. */
  private inner class AppOpenAdManager {
    private var appOpenAd: AppOpenAd? = null
    private var isLoadingAd = false
    var isShowingAd = false

    /** Request an ad. */
    fun loadAd(context: Context) {
      // We will implement this later.
    }

    /** Check if ad exists and can be shown. */
    private fun isAdAvailable(): Boolean {
      return appOpenAd != null
    }
  }
}

現在您已擁有公用程式類別，可以在 MyApplication 類別中執行個體化：

Java

public class MyApplication extends Application {

  private AppOpenAdManager appOpenAdManager;

  @Override
  public void onCreate() {
    super.onCreate();
    new Thread(
            () -> {
              // Initialize the Google Mobile Ads SDK on a background thread.
              MobileAds.initialize(this, initializationStatus -> {});
            })
        .start();
    appOpenAdManager = new AppOpenAdManager(this);
  }
}

Kotlin

class MyApplication : Application() {

  private lateinit var appOpenAdManager: AppOpenAdManager

  override fun onCreate() {
    super.onCreate()
    val backgroundScope = CoroutineScope(Dispatchers.IO)
    backgroundScope.launch {
      // Initialize the Google Mobile Ads SDK on a background thread.
      MobileAds.initialize(this@MyApplication) {}
    }
    appOpenAdManager = AppOpenAdManager()
  }
}

載入廣告

下一步是填寫 loadAd() 方法，並處理廣告載入回呼。

Java

private class AppOpenAdManager {
  // ...
  /** Request an ad. */
  public void loadAd(Context context) {
    // Do not load ad if there is an unused ad or one is already loading.
    if (isLoadingAd || isAdAvailable()) {
      return;
    }

    isLoadingAd = true;
    AdRequest request = new AdRequest.Builder().build();
    AppOpenAd.load(
        context, AD_UNIT_ID, request,
        AppOpenAd.APP_OPEN_AD_ORIENTATION_PORTRAIT,
        new AppOpenAdLoadCallback() {
          @Override
          public void onAdLoaded(AppOpenAd ad) {
            // Called when an app open ad has loaded.
            Log.d(LOG_TAG, "Ad was loaded.");
            appOpenAd = ad;
            isLoadingAd = false;
            loadTime = (new Date()).getTime();
          }

          @Override
          public void onAdFailedToLoad(LoadAdError loadAdError) {
            // Called when an app open ad has failed to load.
            Log.d(LOG_TAG, loadAdError.getMessage());
            isLoadingAd = false;
          }
        });
  }
  // ...
}

Kotlin

private inner class AppOpenAdManager {
  // ...
  /** Request an ad. */
  fun loadAd(context: Context) {
    // Do not load ad if there is an unused ad or one is already loading.
    if (isLoadingAd || isAdAvailable()) {
      return
    }

    isLoadingAd = true
    val request = AdRequest.Builder().build()
    AppOpenAd.load(
        context, AD_UNIT_ID, request,
        AppOpenAd.APP_OPEN_AD_ORIENTATION_PORTRAIT,
        object : AppOpenAdLoadCallback() {

          override fun onAdLoaded(ad: AppOpenAd) {
            // Called when an app open ad has loaded.
            Log.d(LOG_TAG, "Ad was loaded.")
            appOpenAd = ad
            isLoadingAd = false
            loadTime = Date().time
          }

          override fun onAdFailedToLoad(loadAdError: LoadAdError) {
            // Called when an app open ad has failed to load.
            Log.d(LOG_TAG, loadAdError.message)
            isLoadingAd = false;
          }
        })
  }
  // ...
}

顯示廣告並處理全螢幕回呼事件

最常見的應用程式開啟頁面廣告導入做法，是在應用程式啟動時嘗試顯示應用程式開啟頁面廣告，如果廣告尚未準備就緒，則啟動應用程式內容，並預先載入下一次應用程式開啟頁面廣告的機會。如需導入範例，請參閱應用程式開啟頁面廣告指南。

下列程式碼示範如何顯示廣告，然後重新載入：

Java

public class MyApplication extends Application {
  // ...
  /** Interface definition for a callback to be invoked when an app open ad is complete. */
  public interface OnShowAdCompleteListener {
    void onShowAdComplete();
  }

  private class AppOpenAdManager {
    // ...

    /** Shows the ad if one isn't already showing. */
    public void showAdIfAvailable(
        @NonNull final Activity activity,
        @NonNull OnShowAdCompleteListener onShowAdCompleteListener){
      // If the app open ad is already showing, do not show the ad again.
      if (isShowingAd) {
        Log.d(LOG_TAG, "The app open ad is already showing.");
        return;
      }

      // If the app open ad is not available yet, invoke the callback then load the ad.
      if (!isAdAvailable()) {
        Log.d(LOG_TAG, "The app open ad is not ready yet.");
        onShowAdCompleteListener.onShowAdComplete();
        loadAd(activity);
        return;
      }

      appOpenAd.setFullScreenContentCallback(
          new FullScreenContentCallback() {

            @Override
            public void onAdDismissedFullScreenContent() {
              // Called when fullscreen content is dismissed.
              // Set the reference to null so isAdAvailable() returns false.
              Log.d(LOG_TAG, "Ad dismissed fullscreen content.");
              appOpenAd = null;
              isShowingAd = false;

              onShowAdCompleteListener.onShowAdComplete();
              loadAd(activity);
            }

            @Override
            public void onAdFailedToShowFullScreenContent(AdError adError) {
              // Called when fullscreen content failed to show.
              // Set the reference to null so isAdAvailable() returns false.
              Log.d(LOG_TAG, adError.getMessage());
              appOpenAd = null;
              isShowingAd = false;

              onShowAdCompleteListener.onShowAdComplete();
              loadAd(activity);
            }

            @Override
            public void onAdShowedFullScreenContent() {
              // Called when fullscreen content is shown.
              Log.d(LOG_TAG, "Ad showed fullscreen content.");
            }
          });
      isShowingAd = true;
      appOpenAd.show(activity);
    }
    // ...
  }
}

Kotlin

class MyApplication : Application() {
  // ...
  /** Interface definition for a callback to be invoked when an app open ad is complete. */
  interface OnShowAdCompleteListener {
    fun onShowAdComplete()
  }

  private inner class AppOpenAdManager {
    // ...

    /** Shows the ad if one isn't already showing. */
    fun showAdIfAvailable(
        activity: Activity,
        onShowAdCompleteListener: OnShowAdCompleteListener) {
      // If the app open ad is already showing, do not show the ad again.
      if (isShowingAd) {
        Log.d(LOG_TAG, "The app open ad is already showing.")
        return
      }

      // If the app open ad is not available yet, invoke the callback then load the ad.
      if (!isAdAvailable()) {
        Log.d(LOG_TAG, "The app open ad is not ready yet.")
        onShowAdCompleteListener.onShowAdComplete()
        loadAd(activity)
        return
      }

      appOpenAd?.setFullScreenContentCallback(
          object : FullScreenContentCallback() {

            override fun onAdDismissedFullScreenContent() {
              // Called when full screen content is dismissed.
              // Set the reference to null so isAdAvailable() returns false.
              Log.d(LOG_TAG, "Ad dismissed fullscreen content.")
              appOpenAd = null
              isShowingAd = false

              onShowAdCompleteListener.onShowAdComplete()
              loadAd(activity)
            }

            override fun onAdFailedToShowFullScreenContent(adError: AdError) {
              // Called when fullscreen content failed to show.
              // Set the reference to null so isAdAvailable() returns false.
              Log.d(LOG_TAG, adError.message)
              appOpenAd = null
              isShowingAd = false

              onShowAdCompleteListener.onShowAdComplete()
              loadAd(activity)
            }

            override fun onAdShowedFullScreenContent() {
              // Called when fullscreen content is shown.
              Log.d(LOG_TAG, "Ad showed fullscreen content.")
            }
          })
      isShowingAd = true
      appOpenAd?.show(activity)
    }
    // ...
  }
}

FullScreenContentCallback 會處理廣告顯示、無法顯示或遭到關閉等事件。

考慮廣告效期

為避免顯示已失效的廣告，請新增方法來AppOpenAdManager檢查廣告參照載入多久。然後使用該方法檢查廣告是否仍然有效。

Java

private class AppOpenAdManager {
  // ...
  /** Keep track of the time an app open ad is loaded to ensure you don't show an expired ad. */
  private long loadTime = 0;

  // ...

  /** Utility method to check if ad was loaded more than n hours ago. */
  private boolean wasLoadTimeLessThanNHoursAgo(long numHours) {
    long dateDifference = (new Date()).getTime() - this.loadTime;
    long numMilliSecondsPerHour = 3600000;
    return (dateDifference < (numMilliSecondsPerHour * numHours));
  }

  /** Check if ad exists and can be shown. */
  public boolean isAdAvailable() {
    return appOpenAd != null && wasLoadTimeLessThanNHoursAgo(4);
  }
}

Kotlin

private inner class AppOpenAdManager {
  // ...
  /** Keep track of the time an app open ad is loaded to ensure you don't show an expired ad. */
  private var loadTime: Long = 0;

  // ...

  /** Utility method to check if ad was loaded more than n hours ago. */
  private fun wasLoadTimeLessThanNHoursAgo(numHours: Long): Boolean {
    val dateDifference: Long = Date().time - loadTime
    val numMilliSecondsPerHour: Long = 3600000
    return dateDifference < numMilliSecondsPerHour * numHours
  }

  /** Check if ad exists and can be shown. */
  private fun isAdAvailable(): Boolean {
    return appOpenAd != null && wasLoadTimeLessThanNHoursAgo(4)
  }
}

追蹤目前的活動

如要顯示廣告，您需要 Activity 環境。如要追蹤目前使用的最新活動，請註冊並實作 Application.ActivityLifecycleCallbacks。

Java

public class MyApplication extends Application implements ActivityLifecycleCallbacks {

  private Activity currentActivity;

  @Override
  public void onCreate() {
    super.onCreate();
    this.registerActivityLifecycleCallbacks(this);
    // ...
  }

  /** ActivityLifecycleCallback methods. */
  @Override
  public void onActivityCreated(Activity activity, Bundle savedInstanceState) {}

  @Override
  public void onActivityStarted(Activity activity) {
    currentActivity = activity
  }

  @Override
  public void onActivityResumed(Activity activity) {}

  @Override
  public void onActivityStopped(Activity activity) {}

  @Override
  public void onActivityPaused(Activity activity) {}

  @Override
  public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {}

  @Override
  public void onActivityDestroyed(Activity activity) {}
}

Kotlin

class MyApplication : Application(), Application.ActivityLifecycleCallbacks {

  private var currentActivity: Activity? = null

  override fun onCreate() {
    super.onCreate()
    registerActivityLifecycleCallbacks(this)
    // ...
  }

  /** ActivityLifecycleCallback methods. */
  override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle?) {}

  override fun onActivityStarted(activity: Activity) {
    currentActivity = activity
  }

  override fun onActivityResumed(activity: Activity) {}

  override fun onActivityPaused(activity: Activity) {}

  override fun onActivityStopped(activity: Activity) {}

  override fun onActivitySaveInstanceState(activity: Activity, outState: Bundle) {}

  override fun onActivityDestroyed(activity: Activity) {}
}

registerActivityLifecycleCallbacks 可監聽所有 Activity 事件。監聽活動的啟動和終止時間，即可追蹤目前 Activity 的參照，然後用於顯示應用程式開啟廣告。

監聽應用程式前景事件

將程式庫新增至 Gradle 檔案

如要接收應用程式前景事件的通知，請註冊 DefaultLifecycleObserver。將依附元件新增至應用程式層級的建構檔案：

Kotlin

  dependencies {
    implementation("com.google.android.gms:play-services-ads:24.4.0")
    implementation("androidx.lifecycle:lifecycle-process:2.8.3")
  }

Groovy

  dependencies {
    implementation 'com.google.android.gms:play-services-ads:24.4.0'
    implementation 'androidx.lifecycle:lifecycle-process:2.8.3'
  }

導入生命週期觀察器介面

您可以實作 DefaultLifecycleObserver 介面，監聽前景事件。

導入 onStart 事件，顯示應用程式開啟頁面廣告。

Java

public class MyApplication extends Application
    implements ActivityLifecycleCallbacks, LifecycleObserver {
  // ...
  @Override
  public void onCreate() {
    super.onCreate();
    this.registerActivityLifecycleCallbacks(this);
    new Thread(
            () -> {
              // Initialize the Google Mobile Ads SDK on a background thread.
              MobileAds.initialize(this, initializationStatus -> {});
            })
        .start();
    ProcessLifecycleOwner.get().getLifecycle().addObserver(this);
    appOpenAdManager = new AppOpenAdManager();
  }

  /** LifecycleObserver method that shows the app open ad when the app moves to foreground. */
  @OnLifecycleEvent(Event.ON_START)
  protected void onMoveToForeground() {
    // Show the ad (if available) when the app moves to foreground.
    appOpenAdManager.showAdIfAvailable(currentActivity);
  }

  /** Show the ad if one isn't already showing. */
  private void showAdIfAvailable(@NonNull final Activity activity) {
      showAdIfAvailable(
          activity,
          new OnShowAdCompleteListener() {
            @Override
            public void onShowAdComplete() {
              // Empty because the user will go back to the activity that shows the ad.
            }
          });
  }
}

Kotlin

class MyApplication : Application(),
    Application.ActivityLifecycleCallbacks, LifecycleObserver {
  // ...
  override fun onCreate() {
    super.onCreate()
    registerActivityLifecycleCallbacks(this)
    val backgroundScope = CoroutineScope(Dispatchers.IO)
    backgroundScope.launch {
      // Initialize the Google Mobile Ads SDK on a background thread.
      MobileAds.initialize(this@MyApplication) {}
    }
    ProcessLifecycleOwner.get().lifecycle.addObserver(this)
    appOpenAdManager = AppOpenAdManager()
  }

  /** LifecycleObserver method that shows the app open ad when the app moves to foreground. */
  @OnLifecycleEvent(Lifecycle.Event.ON_START)
  fun onMoveToForeground() {
    // Show the ad (if available) when the app moves to foreground.
    currentActivity?.let {
      appOpenAdManager.showAdIfAvailable(it)
    }
  }

  /** Show the ad if one isn't already showing. */
  fun showAdIfAvailable(activity: Activity) {
    showAdIfAvailable(
        activity,
        object : OnShowAdCompleteListener {
          override fun onShowAdComplete() {
            // Empty because the user will go back to the activity that shows the ad.
          }
        })
  }
}

冷啟動和載入畫面

目前為止，文件都假設您只會在使用者將應用程式從記憶體中恢復到前景時，顯示應用程式開啟頁面廣告。如果應用程式啟動時未在記憶體中暫停，就會發生「冷啟動」。

舉例來說，使用者第一次開啟應用程式時，就是冷啟動。冷啟動時，您不會有先前載入的應用程式開啟頁面廣告，因此無法立即顯示。如果您要求廣告後，廣告過一段時間才傳回，使用者可能會在看到與內容無關的廣告前，短暫使用您的應用程式。這會造成使用者體驗不佳，建議您不要採用。

如要在冷啟動時放送應用程式開啟頁面廣告，建議使用載入畫面載入遊戲或應用程式素材資源，並只在載入畫面中顯示廣告。如果應用程式已完成載入，並將使用者導向應用程式的主要內容，請勿顯示廣告。

最佳做法

應用程式開啟頁面廣告可協助您在應用程式首次啟動及切換期間，透過應用程式的載入畫面營利，但請務必遵守最佳做法，確保使用者享有良好的應用程式體驗。建議您：

等使用者用過應用程式幾次之後，再放送第一則應用程式開啟頁面廣告。
在使用者等待應用程式載入時，放送應用程式開啟頁面廣告。
如果載入畫面顯示在應用程式開啟頁面廣告的背景中，且載入畫面在廣告關閉前就完成載入，建議您利用 onAdDismissedFullScreenContent() 方法關閉載入畫面。

GitHub 上的範例

應用程式開啟頁面廣告範例： Java | Kotlin

後續步驟

請參閱下列主題：

應用程式開啟頁面廣告 透過集合功能整理內容 你可以依據偏好儲存及分類內容。

必要條件

一律使用測試廣告進行測試

擴充 Application 類別

Java

Kotlin

實作公用程式元件

Java

Kotlin

Java

Kotlin

載入廣告

Java

Kotlin

顯示廣告並處理全螢幕回呼事件

Java

Kotlin

考慮廣告效期

Java

Kotlin

追蹤目前的活動

Java

Kotlin

監聽應用程式前景事件

將程式庫新增至 Gradle 檔案

Kotlin

Groovy

導入生命週期觀察器介面

Java

Kotlin

冷啟動和載入畫面

最佳做法

GitHub 上的範例

後續步驟

應用程式開啟頁面廣告