Get class reference from routes flutter - flutter

Question

Presume I have three classes: main, EndpointList and FillDataClass.
I have defined some routes in my main class as such:
void main() {
runApp(MaterialApp(
title: 'Named Routes Demo',
initialRoute: '/',
routes: {
'/': (context) => MyApp(),
'/endpoint_list': (context) => EndpointList(),
},
));
}
My EndpointList class is a simple list view:
import 'package:flutter/material.dart';
class EndpointData {
EndpointData(this.name, this.id, this.token, this.isIncoming);
final String name;
final String id;
final String token;
bool isIncoming;
}
class EndpointList extends StatefulWidget {
EndpointList({Key key}) : super(key: key);
#override
_EndpointList createState() => new _EndpointList();
}
class _EndpointList extends State<EndpointList> {
List<EndpointData> endpointList = <EndpointData>[];
#override
Widget build(BuildContext context) {
// build and show list
}
void insertEndpoint(EndpointData endpointData){
endpointList.add(endpointData);
}
}
My question is, how can I access and instance of EndpointList, from class that is not main, in order to call the insertEndpoint method?
In my java mind, I want to do this:
Endpoint endpoint = new Endpoint(); // This is done in route in main class
And then from class FillDataClass (presuming endpoint has been properly instanced in FillDataClass via constructor):
endpoint.insertEndpoint(data);
How can I create and access endpoint in order to populate, and then display, my list?

Answer 1

Use a separate the Endpoint class which will contain an insertEndPoint mothed.
class EndpointData {
EndpointData(this.name, this.id, this.token, this.isIncoming);
final String name;
final String id;
final String token;
bool isIncoming;
List<EndpointData> _endpointList = <EndpointData>[];
void insertEndpoint(EndpointData endpointData){
_endpointList.add(endpointData);
}
}
Then in your UI
class EndpointListUI extends StatefulWidget {
EndpointListUI({Key key}) : super(key: key);
#override
_EndpointListUI createState() => new _EndpointListUI();
}
class _EndpointListUI extends State<EndpointListUI> {
//You can create instance from anywhere and insert data to it
List<EndpointData> endpointList = <EndpointData>[];
endpointList.add(endpointData);
#override
Widget build(BuildContext context) {
// build and show list
}
}