Как отправить уведомление во флаттере с помощью FCM

Question

Как отправить уведомление во флаттере с помощью FCM

Я пытаюсь отправить уведомление от firebase с помощью FCM, следуя коду на YouTube. При запуске системы обнаружил такую ошибку:

[ОШИБКА: flutter / lib / ui / ui_dart_state.cc(199)] Необработанное исключение: PlatformException (ошибка, NotificationChannelGroup не существует, значение null, java.lang.IllegalArgumentException: NotificationChannelGroup не существует

В консоли firebase статус завершен, но в эмулятор не отправлено. Кто-нибудь может мне помочь, в чем проблема?

код main.dart

      import 'package:flutter/material.dart';

import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:monger_app/WelcomeScreen/login.dart';
import 'package:monger_app/WelcomeScreen/signup.dart';
import 'package:monger_app/WelcomeScreen/welcome_screen.dart';
import 'package:monger_app/localization/demo_localization.dart';
import 'package:monger_app/page/pushNotification.dart';
import 'package:monger_app/page/root.dart';
import 'package:monger_app/theme/colors.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:provider/provider.dart';
import 'localization/localization_constants.dart';



void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  //FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);

  return runApp(ChangeNotifierProvider(
    child: MyApp(),
    create: (BuildContext context) => ThemeProvider(isDarkMode: true),
  ));
}

class MyApp extends StatefulWidget {

  static void setLocale(BuildContext context, Locale locale){
    _MyAppState state = context.findAncestorStateOfType<_MyAppState>();
    state.setLocale(locale);
  }
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {

  Locale _locale;

  void setLocale(Locale locale){
    setState(() {
      _locale = locale;
    });
  }

  FirebaseNotifcation firebase;

  handleAsync() async {
    await firebase.initialize();

    String token = await firebase.getToken();
    print("Firebase token : $token");
  }

  @override
  void initState() {
    super.initState();
    firebase = FirebaseNotifcation();
    handleAsync();
  }

 @override
  void didChangeDependencies() {
    getLocale().then((locale){
      setState(() {
        this._locale = locale;
      });
    });
    super.didChangeDependencies();
  }

  @override
  Widget build(BuildContext context) {
    return Consumer<ThemeProvider>(
      builder: (context, themeProvider, child){
        if (_locale == null) {
          return Container(
            child: Center(
              child: CircularProgressIndicator(),
            ),
          );
        } else {
          return MaterialApp(
            theme: themeProvider.getTheme,
            locale: _locale,
            supportedLocales: [
              Locale('en', 'US'),
              Locale('id', 'ID'),
              Locale('zh', 'CN'),
            ],
            localizationsDelegates: [
              DemoLocalization.delegate,
              GlobalMaterialLocalizations.delegate,
              GlobalWidgetsLocalizations.delegate,
              GlobalCupertinoLocalizations.delegate,
            ],
            localeResolutionCallback: (deviceLocale, supportedLocales){
              for (var locale in supportedLocales) {
                if (locale.languageCode == deviceLocale.languageCode && locale.countryCode == deviceLocale.countryCode) {
                  return deviceLocale;
                }
              }
              return supportedLocales.first;
            },
            debugShowCheckedModeBanner: false,
            home:

            WelcomeScreen(),

            routes: <String,WidgetBuilder>{

              "SignIn" : (BuildContext context)=>LoginPage(),
              "SignUp":(BuildContext context)=>SignUpPage(),
              "start":(BuildContext context)=>Root(),
              "welcome":(BuildContext context)=>WelcomeScreen(),
            },

          );
        }
      }
    );
  }
}

puchNotification.dart код

      import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';

const AndroidNotificationChannel channel = AndroidNotificationChannel(
    'high_importance_channel',
    "High Importance Notifcations",
    "This channel is used important notification",
    groupId: "Notification_group");

final FlutterLocalNotificationsPlugin flutterLocalNotificationplugin =
FlutterLocalNotificationsPlugin();

Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
  await Firebase.initializeApp();
  print("Handling a background message : ${message.messageId}");
  print(message.data);
}

class FirebaseNotifcation {
  initialize() async {
    await Firebase.initializeApp();
    FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);

    await flutterLocalNotificationplugin
        .resolvePlatformSpecificImplementation<
        AndroidFlutterLocalNotificationsPlugin>()
        ?.createNotificationChannel(channel);
    var intializationSettingsAndroid =
    AndroidInitializationSettings('@mipmap/ic_launcher');
    var initializationSettings =
    InitializationSettings(android: intializationSettingsAndroid);

    flutterLocalNotificationplugin.initialize(initializationSettings);
    FirebaseMessaging.onMessage.listen((RemoteMessage message) async {
      RemoteNotification notification = message.notification;
      AndroidNotification android = message.notification?.android;
      if (notification != null && android != null) {
        AndroidNotificationDetails notificationDetails =
        AndroidNotificationDetails(
            channel.id, channel.name, channel.description,
            importance: Importance.max,
            priority: Priority.high,
            groupKey: channel.groupId);
        NotificationDetails notificationDetailsPlatformSpefics =
        NotificationDetails(android: notificationDetails);
        flutterLocalNotificationplugin.show(
            notification.hashCode,
            notification.title,
            notification.body,
            notificationDetailsPlatformSpefics);
      }

      List<ActiveNotification> activeNotifications =
      await flutterLocalNotificationplugin
          .resolvePlatformSpecificImplementation<
          AndroidFlutterLocalNotificationsPlugin>()
          ?.getActiveNotifications();
      if (activeNotifications.length > 0) {
        List<String> lines =
        activeNotifications.map((e) => e.title.toString()).toList();
        InboxStyleInformation inboxStyleInformation = InboxStyleInformation(
            lines,
            contentTitle: "${activeNotifications.length - 1} messages",
            summaryText: "${activeNotifications.length - 1} messages");
        AndroidNotificationDetails groupNotificationDetails =
        AndroidNotificationDetails(
            channel.id, channel.name, channel.description,
            styleInformation: inboxStyleInformation,
            setAsGroupSummary: true,
            groupKey: channel.groupId);

        NotificationDetails groupNotificationDetailsPlatformSpefics =
        NotificationDetails(android: groupNotificationDetails);
        await flutterLocalNotificationplugin.show(
            0, '', '', groupNotificationDetailsPlatformSpefics);
      }
    });
  }

  Future<String> getToken() async {
    String token = await FirebaseMessaging.instance.getToken();
    print(token);
    return token;
  }

  subscribeToTopic(String topic) async {
    await FirebaseMessaging.instance.subscribeToTopic(topic);
  }
}

build.gradle файл

      def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {
    compileSdkVersion 30

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.example.monger_app"
        minSdkVersion 21
        targetSdkVersion 30
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation platform('com.google.firebase:firebase-bom:28.0.1')
    implementation "com.google.firebase:firebase-messaging:20.1.0"
}

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

AndroidManifest.xml

      <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.example.monger_app">

   <application
       tools:replace="android:label"
        android:name=".Application"
        android:label="MONGE"
        android:icon="@mipmap/ic_launcher">
        <activity
            android:name=".MainActivity"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">
            <!-- Specifies an Android theme to apply to this Activity as soon as
                 the Android process has started. This theme is visible to the user
                 while the Flutter UI initializes. After that, this theme continues
                 to determine the Window background behind the Flutter UI. -->
            <meta-data
              android:name="io.flutter.embedding.android.NormalTheme"
              android:resource="@style/NormalTheme"
              />
            <!-- Displays an Android View that continues showing the launch screen
                 Drawable until Flutter paints its first frame, then this splash
                 screen fades out. A splash screen is useful to avoid any visual
                 gap between the end of Android's launch screen and the painting of
                 Flutter's first frame. -->
            <meta-data
              android:name="io.flutter.embedding.android.SplashScreenDrawable"
              android:resource="@drawable/launch_background"
              />
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
            <intent-filter>
                <action android:name="FLUTTER_NOTIFICATION_CLICK" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
        <!-- Don't delete the meta-data below.
             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
    </application>
</manifest>

1

android flutter firebase-cloud-messaging flutter-notification

Источник

user13602792 03 июл '21 в 12:49

3 ответа

Другие вопросы по тегам android flutter firebase-cloud-messaging flutter-notification

user11039164 04 июл '21 в 02:12 2021-07-04 02:12 · Answer 1 · 2021-07-04 02:12

Ошибка возникает из-за того, что вы передаете идентификатор группы в канал уведомлений, но не создали группу каналов уведомлений.

Решение:

Если вам не нужна группа каналов уведомлений:

Избавиться от ошибки можно, убрав необязательный groupIdиз вашего объекта AndroidNotificationChannel .

Обновите свой channel к этому:
```
        const AndroidNotificationChannel channel = AndroidNotificationChannel(
 'high_importance_channel',
 "High Importance Notifcations",
 "This channel is used important notification");
```

Если вам нужна группа каналов уведомлений:

Создайте группу каналов уведомлений и назначьте ей тот же идентификатор группы, который вы добавили в канал уведомлений.

Вот фрагмент кода из flutter_local_notificationsпример пакета , показывающий это.

        const String channelGroupId = 'your channel group id';
// create the group first
const AndroidNotificationChannelGroup androidNotificationChannelGroup =
 AndroidNotificationChannelGroup(
     channelGroupId, 'your channel group name',
     description: 'your channel group description');
await flutterLocalNotificationsPlugin
 .resolvePlatformSpecificImplementation<
     AndroidFlutterLocalNotificationsPlugin>()!
 .createNotificationChannelGroup(androidNotificationChannelGroup);

// create channels associated with the group
await flutterLocalNotificationsPlugin
 .resolvePlatformSpecificImplementation<
     AndroidFlutterLocalNotificationsPlugin>()!
 .createNotificationChannel(const AndroidNotificationChannel(
     'grouped channel id 1',
     'grouped channel name 1',
     'grouped channel description 1',
     groupId: channelGroupId));

user8792236 02 ноя '21 в 10:28 2021-11-02 10:28 · Answer 2 · 2021-11-02 10:28

если вам это не нужно, вы можете удалить "groupId:" Notification_group "" в puchNotification.dart. моя проблема решается этим методом.

1

Источник

user8792236 02 ноя '21 в 10:28

ahmar jani 14 окт '23 в 06:18 2023-10-14 06:18 · Answer 3 · 2023-10-14 06:18

«high_importance_channel» я только что добавил эту строку в канал уведомлений Android, у меня это сработало

0

Источник

ahmar jani 14 окт '23 в 06:18