小编Mah*_*ziz的帖子

我正在开发一个使用 FCM 推送通知的应用程序，当应用程序在后台或终止并收到新通知时，我需要将此通知的数据保存在本地（SQLITE）中，而无需单击通知或再次重新打开应用程序，除非单击，否则不会在应用程序中读取通知。有什么建议？

这是我的 NotificationHandler.dart

import 'dart:async';
import 'dart:io';
import 'package:eshaar/model/message.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:intl/intl.dart';
import 'package:eshaar/model/database_helper.dart';


FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
new FlutterLocalNotificationsPlugin();

Future<dynamic> myBackgroundMessageHandler(Map<String, dynamic> message) async {
  print("onBackgroundMessage: $message");
  //_showBigPictureNotification(message);
  return Future<void>.value();
}


Future onSelectNotification(String payload) async {

}

class NotificationHandler {
  FirebaseMessaging _fcm = FirebaseMessaging();
  StreamSubscription iosSubscription;
  DatabaseHelper db = new DatabaseHelper();
  static final NotificationHandler _singleton =
  new NotificationHandler._internal();

  factory NotificationHandler() {
    return _singleton;
  }
  NotificationHandler._internal();

  initializeFcmNotification() async {
    var initializationSettingsAndroid =
    new AndroidInitializationSettings('mipmap/ic_launcher');
    var initializationSettingsIOS …

在某些Android设备上，当Firebase.instance.getToken出现时，会出现此异常。尽管 api key 支持所有 firebase 安装服务。

Future<String> getDeviceToken() async {
  try {
    String? token;
    token = await _firebaseMessaging.getToken() ?? '';
    return Future.value(token);
  } catch (e) {
    return Future.value("");
  }
}