2021年2月3日 星期三

Flutter 開發文件之 iOS 與 Android 實作筆記 - 使用 Admob 以 Interstitial ads 為例


關於 flutter 使用 Admob 的架構,可參考網路上數篇文章:
此例筆記 iOS & Android 的設定方式,並且記錄碰到的錯誤訊息。

Android app 設定方式:

1. 更新 flutter_app/pubspec.yaml 添加 dependencies (記得要運行 flutter pub get)

firebase: ^8.0.0
firebase_admob: ^0.11.0+1

2. 安置從 Firebase 建立專案時得到的 google-services.json 檔案,擺在 flutter_app/android/app/ 中

3. 更新 flutter_app/android/build.gradle 的 buildscript -> dependencies 設定

//classpath 'com.android.tools.build:gradle:3.5.0'
// 為了修正錯誤訊息:error: unexpected element <queries> found in <manifest>.
classpath 'com.android.tools.build:gradle:4.0.0'
classpath 'com.google.gms:google-services:4.3.3'

4. 更新 flutter_app/android/gradle/wrapper/gradle-wrapper.properties 的 gradle 版本至 6.1.1

#為了修正錯誤訊息:Minimum supported Gradle version is 6.1.1. Current version is 5.6.2. If using the gradle wrapper
distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-all.zip

5. 增加 flutter_app/app/build.gradle 的 apply 項目

apply plugin: 'com.google.gms.google-services'

6. 更新 flutter_app/android/app/src/main/AndroidManifest.xml 添加 meta data (僅範例程式數值)

<meta-data android:name="com.google.android.gms.ads.APPLICATION_ID" android:value="ca-app-pub-3940256099942544~3347511713"/>

7. 更新 flutter_app/lib/main.dart (此改自於範例程式,讓 add Button 可以產生一個插頁廣告)

iOS app 設定方式:

1. 更新 flutter_app/pubspec.yaml 添加 dependencies(記得要運行 flutter pub get)

firebase: ^8.0.0
firebase_admob: ^0.11.0+1

2. 安置從 Firebase 建立專案時得到的 GoogleService-Info.plist ,用 Xcode 打開專案,把 GoogleService-Info.plist 拖拉擺入跟 Info.plist 的同階目錄位置。

% open flutter_app/ios/Runner.xcworkspace
% ls flutter_app/ios/Runner/GoogleService-Info.plist

3. 更新 Info.plist 內容,添加資訊 GADApplicationIdentifier 等資訊(僅範例程式數值)

<key>GADApplicationIdentifier</key>
<string>ca-app-pub-3940256099942544~1458002511</string>
<key>SKAdNetworkItems</key>
  <array>
    <dict>
      <key>SKAdNetworkIdentifier</key>
      <string>cstr6suwn9.skadnetwork</string>
    </dict>
  </array>

4. 更新 Podfile ,上方添加 platform :ios, '10.0'

為了修正錯誤訊息: 
Automatically assigning platform `iOS` with version `9.0` on target `Runner` because no platform was specified. Please specify a platform for this target in your Podfile.

5. 更新 flutter_app/lib/main.dart (此改自於範例程式,讓 add Button 可以產生一個插頁廣告)

如此就收工啦!而 flutter_app/lib/main.dart 內容如下:

import 'package:flutter/material.dart';

import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_admob/firebase_admob.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  MobileAdTargetingInfo targetingInfo = MobileAdTargetingInfo(
    keywords: <String>['flutterio', 'beautiful apps'],
    contentUrl: 'https://flutter.io',
    childDirected: true,
    nonPersonalizedAds: true,
  );

  InterstitialAd _interstitialAd;

  InterstitialAd createInterstitialAd() {
    return InterstitialAd(
      adUnitId: InterstitialAd.testAdUnitId,
      targetingInfo: targetingInfo,
      listener: (MobileAdEvent event) {
        print("InterstitialAd event $event");
      },
    );
  }

  @override
  void initState() {
    super.initState();
    FirebaseAdMob.instance.initialize(appId: FirebaseAdMob.testAppId);
    //_interstitialAd = createInterstitialAd()..load();
  }

  @override
  void dispose() {
    _interstitialAd?.dispose();
    super.dispose();
  }

  void _incrementCounter() {
    _interstitialAd?.dispose();
    _interstitialAd = createInterstitialAd()..load()..show();
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

 

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