Payload data as a String, Flutter-CodePudding

I receive an object from my payload data (which has to be a String) like this: {id: 24VQUCeGD4KnW6tvfhj8MJjuASk, event: user}. Since it is a string now, how can I access the key and value pair of both items in flutter from a String? I have tried creating a model class for it, making a Map again out of the String, decoding it back to json object but all failed. How can I get the key/value pair in a proper way?

Code:

await _notificationsPlugin.show(
        id,
        'New notification',
        'You have received a new notification!',
        notificationDetails,
        payload: message.data.toString(), // the payload data has to be a string
      );

When you press on the notification:

onSelectNotification: (String data) async {
      //here is where I want to access the key/value pair of that String 'data'
// i tried something like this but failed

var someData = jsonEncode(jsonDecode(data));
var className = ClassName.fromJson(someData);
print(className.id);
.. but nothing prints

//...  some logic
}

class ClassName {
  ClassName({
    this.id,
    this.event,
  });

  String id;
  String event;

  ClassName.fromJson(Map<String, dynamic> json) {
    id = json['id'];
    user = json['event'];
  }
}

Any form of help is appreciated!

CodePudding user response：

try this:

import 'dart:convert';

void processData(String data) {
  Map<String, dynamic> someData = jsonDecode(data);
  var className = ClassName.fromJson(someData);
  print(className.id);
}

class ClassName {
  ClassName({
    required this.id,
    required this.user,
  });

  String id;
  String user;

  ClassName.fromJson(Map<String, dynamic> json) :
    id = json['id'],
    user = json['user'];
 
}


void main() {
  processData("{\"id\": \"24VQUCeGD4KnW6tvfhj8MJjuASk\", \"user\": \"user\"}");
}

p.s it seems that your provided JSON has id and event keys but in your ClassName, you are reading id and user keys which doesn't exist.

CodePudding user response：

it happens that the id string isn't delimited so, you may try to custom decode like:

Map<String, String> decodePayload(String eventData) {
    final aString = eventData.substring(5, eventData.length - 1);
  
  
  final parts = aString.split(', ');
  final id = parts[0];
  final event = parts[1].substring(7, );
  return {'id': id, 'event':event};

}

It doesn't looks nice but it may works