Flutter移动广告集成插件nowa_mobile_ads的使用

nowa_mobile_ads 是一个用于在 Flutter 应用中集成移动广告的插件。它支持多种广告格式，如横幅广告、插页式广告、激励广告等。以下是如何在 Flutter 项目中使用 nowa_mobile_ads 插件的步骤。

1. 添加依赖

首先，你需要在 pubspec.yaml 文件中添加 nowa_mobile_ads 插件的依赖：

dependencies:
  flutter:
    sdk: flutter
  nowa_mobile_ads: ^1.0.0  # 请检查最新版本

然后运行 flutter pub get 来获取依赖。

2. 初始化插件

在 main.dart 文件中初始化 nowa_mobile_ads 插件：

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

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  
  // 初始化广告插件
  await NowaMobileAds.instance.initialize();

  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

3. 显示横幅广告

在某个页面中显示横幅广告：

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

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

class _MyHomePageState extends State<MyHomePage> {
  BannerAd? _bannerAd;

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

  void _loadBannerAd() {
    _bannerAd = BannerAd(
      adUnitId: 'your_ad_unit_id',  // 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');
        },
      ),
    )..load();
  }

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

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

4. 显示插页式广告

加载并显示插页式广告：

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

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

class _InterstitialAdExampleState extends State<InterstitialAdExample> {
  InterstitialAd? _interstitialAd;

  void _loadInterstitialAd() {
    InterstitialAd.load(
      adUnitId: 'your_interstitial_ad_unit_id',  // 替换为你的插页式广告单元ID
      request: AdRequest(),
      adLoadCallback: InterstitialAdLoadCallback(
        onAdLoaded: (InterstitialAd ad) {
          _interstitialAd = ad;
          print('InterstitialAd loaded.');
        },
        onAdFailedToLoad: (LoadAdError error) {
          print('InterstitialAd failed to load: $error');
        },
      ),
    );
  }

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

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

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

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

5. 显示激励广告

加载并显示激励广告：

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

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

class _RewardedAdExampleState extends State<RewardedAdExample> {
  RewardedAd? _rewardedAd;

  void _loadRewardedAd() {
    RewardedAd.load(
      adUnitId: 'your_rewarded_ad_unit_id',  // 替换为你的激励广告单元ID
      request: AdRequest(),
      rewardedAdLoadCallback: RewardedAdLoadCallback(
        onAdLoaded: (RewardedAd ad) {
          _rewardedAd = ad;
          print('RewardedAd loaded.');
        },
        onAdFailedToLoad: (LoadAdError error) {
          print('RewardedAd failed to load: $error');
        },
      ),
    );
  }

  void _showRewardedAd() {
    if (_rewardedAd != null) {
      _rewardedAd!.show(
        onUserEarnedReward: (RewardedAd ad, RewardItem reward) {
          print('User earned reward: ${reward.amount} ${reward.type}');
        },
      );
    } else {
      print('RewardedAd is not loaded yet.');
    }
  }

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

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

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