本頁面由 Cloud Translation API 翻譯而成。

應用程式開啟頁面廣告

本指南適用於使用 Google Cloud 控制台 Mobile Ads SDK

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可以隨時關閉，要在使用者將應用程式移至前景時顯示。

應用程式開啟頁面廣告會自動顯示一小塊品牌區域，方便使用者認出他們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，而非現場及正式環境廣告否則可能導致帳戶遭到停權。

要載入測試廣告，最簡單的方法就是使用應用程式專用的測試廣告單元 ID 開啟廣告：

ca-app-pub-3940256099942544/9257395921

這項機制經過特別設定，可針對每個請求傳回測試廣告在您的程式設計、測試和偵錯時，可以免費使用應用程式。只需製作務必先用廣告單元 ID 取代廣告單元，再發布應用程式。

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

擴充應用程式類別

建立擴充 Application 類別的新類別，然後新增以下內容程式碼，在應用程式啟動時初始化 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) {}
    }
  }
}

這個動作會初始化 SDK，並提供稍後會註冊的架構用於應用程式前景事件。

接著，請在 AndroidManifest.xml 中加入下列程式碼：

<!-- 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

您的廣告會快速顯示，因此建議您在需要顯示。這樣一來，使用者一進入應用程式，廣告就會立即放送。

導入公用程式元件 AppOpenAdManager，提前發出廣告請求在需要顯示廣告時特別操作

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
    }
  }
}

建立公用程式類別後，您可以在自己的 MyApplication 類別：

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量回呼函式。

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方式，就是嘗試顯示應用程式開啟頁面廣告在應用程式啟動附近時，啟動應用程式內容 (如果廣告尚未就緒)，並預先載入另一則廣告，把握下次的應用程式開放機會如需實作範例，請參閱「應用程式開啟頁面廣告指南」。

下方程式碼展示如何顯示並隨後重新載入廣告：

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 處理事件，例如廣告顯示時、無法顯示廣告或已關閉。

考慮廣告效期

為確保您不顯示已過期的廣告，請在 AppOpenAdManager 中加入方法，檢查廣告參照載入至今已過多久。然後使用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)
  }
}

追蹤目前活動

如要顯示廣告，您必須提供 Activity 結構定義。追蹤使用目前的活動、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敬上可讓您監聽所有 Activity 事件。透過監聽活動都能追蹤到目前版本 Activity，以便您顯示應用程式開啟頁面廣告。

監聽應用程式前景事件

在 Gradle 檔案中加入程式庫

如要收到應用程式前景事件的通知，您必須註冊 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:23.3.0")
    implementation("androidx.lifecycle:lifecycle-process:2.8.3")
  }

Groovy

  dependencies {
    implementation 'com.google.android.gms:play-services-ads:23.3.0'
    implementation 'androidx.lifecycle:lifecycle-process:2.8.3'
  }

實作生命週期觀察器介面

您可以實作 DefaultLifecycleObserver 介面。

執行 onStart 事件以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，本說明文件假設您只有在使用者前景。「冷啟動」發生在應用程式已啟動，但之前未在記憶體中暫停。

舉例來說，使用者首次開啟應用程式時，就是冷啟動的例子。如果選擇冷啟動，您就不會看到先前載入的應用程式開啟頁面廣告就會立即顯示從送出廣告請求到收到廣告之間的延遲時間讓使用者能先短暫使用您的應用程式很容易讓人感到驚訝應避免這麼做，因為使用者體驗不佳

如要在冷啟動時放送應用程式開啟頁面廣告，建議做法是使用載入畫面。載入您的遊戲或應用程式素材資源，而且只在載入過程中顯示廣告。如果您的應用程式已載入完成，並已將使用者導向主要應用程式請不要顯示廣告

最佳做法

應用程式開啟頁面廣告可協助您在應用程式的載入畫面 (首次發生當下) 營利因此在切換應用程式時，請務必遵循讓使用者喜歡使用您的應用程式建議你採取以下做法：

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，顯示應用程式開啟頁面廣告。
如果應用程式開啟頁面廣告下方顯示載入畫面，以及載入畫面建議您在廣告關閉前就完成載入，建議您關閉在 onAdDismissedFullScreenContent() 方法中載入畫面。

GitHub 上的範例

應用程式開啟廣告範例：Java | Kotlin

後續步驟

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