#I am trying to save push notification title and body using shared_preference and and trying to get that saved data in my card view or listtile meaning i wanna show the list of notifications inside my app which i saved locally using shared preference

      static List<String?> detail = [];
      FirebaseMessaging.onMessage.listen((message) async{
          if(message.notification!=null){
            // print(message.notification!.body);
            // print(message.notification!.title);
            final title = message.notification?.title;
            final body = message.notification?.body;
            SharedPreferences prefs = await SharedPreferences.getInstance();
            final String notificationData = json.encode({"title":title,"body":body});
            detail.add(notificationData);
            final data = prefs.setString('notificationData', detail.toString());
            print(data);
            print(detail);
          }
          LocalNotificationService.display(message);
        });

 
    FirebaseMessaging.onMessageOpenedApp.listen((message) async{
      final routeFromMessage = message.data["routeKey"];
      // RemoteNotification? notification = message.notification;
      final title = message.notification?.title;
      final body = message.notification?.body;
      SharedPreferences prefs = await SharedPreferences.getInstance();
      final String notificationData = json.encode({"title":title,"body":body});
      detail.add(notificationData);
      final data = prefs.setString('notificationData', detail.toString());
      print(data);
      print(detail);
      Navigator.of(context).pushNamed(routeFromMessage);
    });

#The data is being saved but my old notification is being replace by the new once and only the new once are showing

  #i am trying to get my saved data like this 

 Future<String?> getNotification() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    prefs.getString("notificationData");
  }

#i wanna get all the list of my notification inside a card view or list view     
          Card(
            child: FutureBuilder(
              future: getNotification(),
              builder: (context,notificationSnapshot){
                if(notificationSnapshot.connectionState == ConnectionState.none && notificationSnapshot.hasData){
                  return const Text("No Notification to Show");
                }
                return ListTile(
                  title: Text("$detail"),
                );
              },
            ),
          )

CodePudding user response：

step 1

first get detail list value

step 2

then append notificationData in detail list

so your list value can't replace with newer one. hope its helpful