[Flutter firebase_messaging note] #Flutter

Android_Integration.txt

// root build.gradle
dependencies {
  // Add the google services classpath
  classpath 'com.google.gms:google-services:4.3.2'
}

// app/build.gradle
// ADD THIS AT THE BOTTOM
apply plugin: 'com.google.gms.google-services'

// AndroidManifest.xml
<intent-filter>
    <action android:name="FLUTTER_NOTIFICATION_CLICK" />
    <category android:name="android.intent.category.DEFAULT" />
</intent-filter>

iOS_Integration.txt

// AppDelegete.swift
@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    GeneratedPluginRegistrant.register(with: self)
    // Add
    if #available(iOS 10.0, *) {
      UNUserNotificationCenter.current().delegate = self as? UNUserNotificationCenterDelegate
    }
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

main.dart

import 'package:firebase_messaging/firebase_messaging.dart';

final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();

// request permission.(ios only)
_firebaseMessaging.requestNotificationPermissions(
  const IosNotificationSettings(
    sound: true, badge: true, alert: true, provisional: true));
_firebaseMessaging.onIosSettingsRegistered
  .listen((IosNotificationSettings settings) {
    print("Settings registered: $settings");
  });

// subscribe topic.
await _firebaseMessaging.subscribeToTopic('xxxxxxxxx');

// unsubscribe topic.
_firebaseMessaging.unsubscribeFromTopic('xxxxxxxxx');

// receiving messages.
// https://github.com/FirebaseExtended/flutterfire/blob/master/packages/firebase_messaging/README.md#receiving-messages
_firebaseMessaging.configure(
  onMessage: (Map<String, dynamic> message) async {
  },
  onLaunch: (Map<String, dynamic> message) async {
  },
  onResume: (Map<String, dynamic> message) async {
  },
);