在Flutter中接入激励插屏广告并监听事件

flutter pub add google_mobile_ads

<!-- AndroidManifest.xml -->
<manifest>
  <application>
    <meta-data
      android:name="com.google.android.gms.ads.APPLICATION_ID"
      android:value="ca-app-pub-xxxxxxxxxxxxxxxx~yyyyyyyyyy"/>
  </application>
</manifest>

<key>GADApplicationIdentifier</key>
<string>ca-app-pub-xxxxxxxxxxxxxxxx~yyyyyyyyyy</string>

import 'dart:developer';
 
import 'package:flutter/material.dart';
import 'package:google_mobile_ads/google_mobile_ads.dart';
 
class RewardedInterstitialAdExample extends StatefulWidget {
  const RewardedInterstitialAdExample({super.key});
 
  @override
  RewardedInterstitialAdExampleState createState() =>
      RewardedInterstitialAdExampleState();
}
 
class RewardedInterstitialAdExampleState
    extends State<RewardedInterstitialAdExample> {
  RewardedInterstitialAd? _rewardedInterstitialAd;
  bool _isAdLoaded = false;
  void _loadAd() {
    RewardedInterstitialAd.load(
      adUnitId: 'ca-app-pub-3940256099942544/5354046379', // 테스트 ID
      request: const AdRequest(),
      rewardedInterstitialAdLoadCallback: RewardedInterstitialAdLoadCallback(
        onAdLoaded: (ad) {
          log('onAdLoaded: 광고 로드 완료');
          setState(() {
            _rewardedInterstitialAd = ad;
            _isAdLoaded = true;
          });
        },
        onAdFailedToLoad: (error) {
          log('onAdFailedToLoad: 광고 로드 실패: $error');
        },
      ),
    );
  }
 
  void _showAd() {
    if (_isAdLoaded && _rewardedInterstitialAd != null) {
      _rewardedInterstitialAd!.fullScreenContentCallback =
          FullScreenContentCallback(
        onAdDismissedFullScreenContent: (ad) {
          log('onAdDismissedFullScreenContent: 광고가 닫혔습니다.');
          ad.dispose();
        },
        onAdFailedToShowFullScreenContent: (ad, error) {
          log('onAdFailedToShowFullScreenContent: 광고 표시 실패: $error');
        },
      );
      _rewardedInterstitialAd!.show(onUserEarnedReward: (ad, reward) {
        log('onUserEarnedReward: 사용자가 보상을 획득했습니다: ${reward.amount} ${reward.type}');
        // 보상 로직 처리
      });
      _rewardedInterstitialAd = null;
      _isAdLoaded = false;
    } else {
      log('onAdFailedToShowFullScreenContent: 광고가 아직 준비되지 않았습니다.');
    }
  }
 
  @override
  void initState() {
    super.initState();
    _loadAd();
  }
 
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('보상형 전면 광고 예제')),
      body: Center(
        child: ElevatedButton(
          onPressed: _showAd,
          child: const Text('광고 보기'),
        ),
      ),
    );
  }
}