Dart - error doing deserialization of FCM Json notification - json

Question

I have an app made in flutter 1.22.2, and I'm putting together a "Notification Center" view. When the notification arrives at the device, it arrives in json format, and I'm trying to make a decode, to display it in this view.
fcm.configure(
onMessage: (message) async {
try {
print("onMessage: $message");
PushDecode.fromJson(message);
print(PushDecode().notification.title);
} catch (e) {
print(e);
}
return message;
},
onLaunch: (message) async {
print("onLaunch: $message");
},
onResume: (message) async {
print("onResume: $message");
},
);
My decode class:
// final pushDecode = pushDecodeFromJson(jsonString);
import 'dart:convert';
PushDecode pushDecodeFromJson(String str) => PushDecode.fromJson(json.decode(str));
String pushDecodeToJson(PushDecode data) => json.encode(data.toJson());
class PushDecode {
PushDecode({
this.data,
this.notification,
});
Data data;
PushNotification notification;
factory PushDecode.fromJson(Map<dynamic, dynamic> json) => PushDecode(
data: Data.fromJson(json["data"]),
notification: PushNotification.fromJson(json["notification"]),
);
Map<dynamic, dynamic> toJson() => {
"data": data.toJson(),
"notification": notification.toJson(),
};
}
class Data {
Data({
this.title,
this.message,
});
String title;
String message;
factory Data.fromJson(Map<dynamic, dynamic> json) => Data(
title: json["title"],
message: json["message"],
);
Map<dynamic, dynamic> toJson() => {
"title": title,
"message": message,
};
}
class PushNotification {
PushNotification({
this.body,
this.title,
});
String body;
String title;
factory PushNotification.fromJson(Map<dynamic, dynamic> json) =>
PushNotification(
body: json["body"],
title: json["title"],
);
Map<dynamic, dynamic> toJson() => {
"body": body,
"title": title,
};
}
I have received this error when I run the code.
I/flutter (xx): onMessage: {notification: {title: Test one, body: Test one body}, data: {title: number 1, message: number too}}
I/flutter (xx): NoSuchMethodError: The getter 'title' was called on null.
I/flutter (xx): Receiver: null
I/flutter (xx): Tried calling: title
What happens is that the onMessage () try goes straight through the decode class, and the error pops up, returning null, what should I do?

Answer 1

Try using PushDecode.fromJson(jsonDecode(message.data));
You might be getting it as a string.