要在Flutter应用中集成AdMob广告，可以使用google_mobile_ads插件。google_mobile_ads是Flutter官方支持的插件，用于在Flutter应用中显示AdMob广告。虽然你提到了adsense_mobile插件，但目前Flutter社区更推荐使用google_mobile_ads插件。下面是如何使用google_mobile_ads插件的步骤：

1. 添加依赖

在你的pubspec.yaml文件中添加google_mobile_ads插件的依赖：

dependencies:
  flutter:
    sdk: flutter
  google_mobile_ads: ^3.0.0

然后运行flutter pub get来安装插件。

2. 配置AdMob应用

在AdMob控制台中创建应用和广告单元，并获取广告单元ID。

3. 初始化插件

在你的main.dart文件中初始化google_mobile_ads插件：

import 'package:flutter/material.dart';
import 'package:google_mobile_ads/google_mobile_ads.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  MobileAds.instance.initialize().then((InitializationStatus status) {
    print('Initialization done: ${status.adapterStatuses}');
    runApp(MyApp());
  });
}

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: AdExample(),
    );
  }
}

4. 显示横幅广告

在你的应用页面中显示横幅广告：

class AdExample extends StatefulWidget {
  [@override](/user/override)
  _AdExampleState createState() => _AdExampleState();
}

class _AdExampleState extends State<AdExample> {
  BannerAd? _bannerAd;

  [@override](/user/override)
  void initState() {
    super.initState();
    _loadBannerAd();
  }

  void _loadBannerAd() {
    _bannerAd = BannerAd(
      adUnitId: 'ca-app-pub-3940256099942544/6300978111', // 替换为你的广告单元ID
      size: AdSize.banner,
      request: AdRequest(),
      listener: BannerAdListener(
        onAdLoaded: (Ad ad) {
          print('BannerAd loaded.');
        },
        onAdFailedToLoad: (Ad ad, LoadAdError error) {
          print('BannerAd failed to load: $error');
          ad.dispose();
        },
        onAdOpened: (Ad ad) => print('BannerAd opened.'),
        onAdClosed: (Ad ad) => print('BannerAd closed.'),
      ),
    )..load();
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('AdMob Example'),
      ),
      body: Column(
        children: [
          Expanded(
            child: Center(
              child: Text('Hello, world!'),
            ),
          ),
          if (_bannerAd != null)
            Container(
              alignment: Alignment.center,
              width: _bannerAd!.size.width.toDouble(),
              height: _bannerAd!.size.height.toDouble(),
              child: AdWidget(ad: _bannerAd!),
            ),
        ],
      ),
    );
  }

  [@override](/user/override)
  void dispose() {
    _bannerAd?.dispose();
    super.dispose();
  }
}

5. 显示插页式广告

你还可以显示插页式广告：

class AdExample extends StatefulWidget {
  [@override](/user/override)
  _AdExampleState createState() => _AdExampleState();
}

class _AdExampleState extends State<AdExample> {
  InterstitialAd? _interstitialAd;

  [@override](/user/override)
  void initState() {
    super.initState();
    _loadInterstitialAd();
  }

  void _loadInterstitialAd() {
    InterstitialAd.load(
      adUnitId: 'ca-app-pub-3940256099942544/1033173712', // 替换为你的广告单元ID
      request: AdRequest(),
      adLoadCallback: InterstitialAdLoadCallback(
        onAdLoaded: (InterstitialAd ad) {
          print('InterstitialAd loaded.');
          _interstitialAd = ad;
        },
        onAdFailedToLoad: (LoadAdError error) {
          print('InterstitialAd failed to load: $error');
        },
      ),
    );
  }

  void _showInterstitialAd() {
    if (_interstitialAd != null) {
      _interstitialAd!.show();
    } else {
      print('InterstitialAd is not ready yet.');
    }
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('AdMob Example'),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: _showInterstitialAd,
          child: Text('Show Interstitial Ad'),
        ),
      ),
    );
  }

  [@override](/user/override)
  void dispose() {
    _interstitialAd?.dispose();
    super.dispose();
  }
}