Integrate the WebView API for Ads

The WebView API for Ads allows in-app ad monetization using WebViewController. If you display web content that implements ads with AdSense code or Google Publisher Tag in your app through WebViewController, you should use this API to enable ads monetization. To learn more, see the AdMob policies.

1. Monetize by making ad requests with the Google Mobile Ads SDK

   You can monetize your app by making ad requests to AdMob with the Google Mobile Ads SDK by implementing ad formats for mobile app.

   Learn more.

2. Monetize by using the WebView API for Ads

   If your app uses WebViewController to display web content that serves ads from Ad Manager or AdSense, use the WebView API for Ads to register WebViewController objects with the Google Mobile Ads SDK. The JavaScript in the AdSense code or Google Publisher Tag builds and sends ad requests so you don't need to make any ad requests with the SDK. Keep in mind that only the mobile web and desktop web inventory formats are available using this API.

   If you don't own the web content in a WebViewController, you are still encouraged to use this API to help protect advertisers from spam and improve monetization for the web publishers that provided the content.

Note that you can do either option, or even both, in the same app.

This guide is intended to help you integrate the WebView API for Ads into your iOS app.

Before you begin

Before you start using the WebView API for Ads, make sure you do the following:

• Use Google Mobile Ads SDK for Flutter plugin with version 3.0.0 or higher in your app.
• Add webview_flutter as a dependency in your pubspec.yaml file.
• Add webview_flutter_android with version 3.7.0 or higher in your app.

Bypass the check for application identifier

Android

Add the following <meta-data> tag in your AndroidManifest.xml file to bypass the check for the APPLICATION_ID. If you miss this step, the Google Mobile Ads SDK might throw an IllegalStateException on app start.

<!-- Bypass APPLICATION_ID check for WebView API for Ads -->
<meta-data
    android:name="com.google.android.gms.ads.INTEGRATION_MANAGER"
    android:value="webview"/>

iOS

Update the Runner/Info.plist file with the key and string value below to bypass a check for the GADApplicationIdentifier. If you miss this step, the Google Mobile Ads SDK might throw a GADInvalidInitializationException on app start.

<!-- Bypass GADApplicationIdentifier check for WebView API for Ads -->
<key>GADIntegrationManager</key>
<string>webview</string>

Register the WebViewController

To improve in-app ad monetization of ads within a WebViewController that uses AdSense code or Google Publisher Tags, follow the steps listed below:

1. Enable JavaScript in the WebViewController. Failure to do so can cause ads not to load.

2. To improve your users' ad experience and be consistent with Chrome's cookie policy, enable third-party cookies on your AndroidWebViewController instance.

3. Register the WebViewController instance by calling the registerWebView() method provided by the Google Mobile Ads SDK.

import 'package:google_mobile_ads/google_mobile_ads.dart';
import 'package:webview_flutter/webview_flutter.dart';
import 'package:webview_flutter_android/webview_flutter_android.dart';

@override
class WebViewExampleState extends State<WebViewExample> {
  late final WebViewController controller;

  @override
  void initState() {
    super.initState();

    createWebView();
  }

  void createWebView() async {
    controller = WebViewController();
    // 1. Enable JavaScript in the web view.
    await controller.setJavaScriptMode(JavaScriptMode.unrestricted);

    // 2. Enable third-party cookies for Android.
    if (controller.platform is AndroidWebViewController) {
      AndroidWebViewCookieManager cookieManager = AndroidWebViewCookieManager(
        const PlatformWebViewCookieManagerCreationParams());
      await cookieManager.setAcceptThirdPartyCookies(
        controller.platform as AndroidWebViewController, true);
    }

    // 3. Register the web view.
    await MobileAds.instance.registerWebView(controller);
  }
}

Load the URL

You can now load a URL and display your web content through WebViewController. We recommend that you load this test URL: https://google.github.io/webview-ads/test/ to test the integration prior to using your own URL. The web page will show an error if JavaScript is not enabled.

import 'package:google_mobile_ads/google_mobile_ads.dart';
import 'package:webview_flutter/webview_flutter.dart';
import 'package:webview_flutter_android/webview_flutter_android.dart';

@override
class WebViewExampleState extends State<WebViewExample> {
  late final WebViewController controller;

  @override
  void initState() {
    super.initState();

    createWebView();
  }

  void createWebView() async {
    controller = WebViewController();
    // 1. Enable JavaScript in the web view.
    await controller.setJavaScriptMode(JavaScriptMode.unrestricted);

    // 2. Enable third-party cookies for Android.
    if (controller.platform is AndroidWebViewController) {
      AndroidWebViewCookieManager cookieManager = AndroidWebViewCookieManager(
        const PlatformWebViewCookieManagerCreationParams());
      await cookieManager.setAcceptThirdPartyCookies(
        controller.platform as AndroidWebViewController, true);
    }

    // 3. Register the web view.
    await MobileAds.instance.registerWebView(controller);

    // 4. Load the URL.
    await controller.loadRequest(Uri.parse('https://google.github.io/webview-ads/test/'));
  }

The test URL shows green status bars for a successful integration if the following conditions apply:

• WebView connected to the Google Mobile Ads SDK
• JavaScript enabled
• Third-party cookies work (not expected on iOS devices)
• First-party cookies work

View the source code of our test URL. You can then replace the test URL with your URL. You can also use a proxy tool such as Charles to capture your app's HTTPS traffic and inspect the ad requests for a &scar= parameter.