Flutter navigator.push() object issue - flutter

Question

While passing an object from one class to another class by using Navigator.push(), the object does not get modifying even its declared as not final.
Main Screen : Created an object(userBean) and passing to First screen
First Screen : displaying the same object(userBean) values, and passing again the same object(userBean) to second screen.
Second screen : trying to get modify the same object (userBean) in second screen, and printing the same object(userBean) in first screen by using refreshData.then method.
Main.dart
import 'package:flutter/material.dart';
import 'package:flutter_app_poc1/firstSceeen.dart';
import 'package:flutter_app_poc1/secondScreen.dart';
import 'package:flutter_app_poc1/userbean.dart';
void main() => runApp(MyApp());
typedef void refreshCallBack(int index);
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
UserBean user = new UserBean();
final List<String> hhList = ["General", "edu"];
int _counter = 0;
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new FlatButton(
child: Text("Next Screen"),
onPressed: () {
user.id = 1;
user.name = "Ramesh";
Future<dynamic> refreshData =
Navigator.of(context).push(new MaterialPageRoute<dynamic>(
builder: (BuildContext context) {
return new FirstScreen(userbean: user);
},
));
refreshData.then((_) {
});
}),
],
),
),
);
}
}
Firstscreen.dart
import 'package:flutter/material.dart';
import 'package:flutter_app_poc1/secondScreen.dart';
import 'package:flutter_app_poc1/userbean.dart';
typedef void refreshCallBack(int index);
class FirstScreen extends StatefulWidget {
UserBean userbean;
FirstScreen({Key key, this.userbean}) : super(key: key);
#override
_FirstScreenState createState() => _FirstScreenState();
}
class _FirstScreenState extends State<FirstScreen> {
String userName;
final List<String> hhList = ["General", "edu"];
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("first"),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new Text(widget.userbean.name),
new RaisedButton(onPressed: (){
Future<dynamic> refreshData =
Navigator.of(context).push(new MaterialPageRoute<dynamic>(
builder: (BuildContext context) {
return new SecondScreen(userbean: widget.userbean);
},
));
refreshData.then((_) {
print(widget.userbean.name);
});
}),
],
),
),
);
}
}
secondscreen.dart
import 'package:flutter/material.dart';
import 'package:flutter_app_poc1/userbean.dart';
class SecondScreen extends StatefulWidget {
UserBean userbean;
SecondScreen({Key key, this.userbean}) : super(key: key);
#override
_SecondScreenState createState() => _SecondScreenState();
}
class _SecondScreenState extends State<SecondScreen> {
UserBean bean = UserBean();
#override
Widget build(BuildContext context) {
bean.name = "suresh";
return Scaffold(
appBar: AppBar(
title: Text("Previous Screen"),
),
body: Center(
child: new FlatButton(
child: Text(bean.name),
onPressed: () {
print(bean.name);
widget.userbean = bean;
Navigator.pop(context, true);
}),
));
}
}

Answer 1

#Murali
If you want to follow the same procedure pass object, then follow the below procedure.
From Navigator.pop push again new Object
onPressed: () {
print("TEST second screen :"+bean.name);
/// here modifying with new object.
widget.userbean = bean;
Navigator.pop(context, widget.userbean);
}),
In second screen Get new Object from Feature Method as below
Future<UserBean> refreshData =
Navigator.of(context).push(new MaterialPageRoute<UserBean>(
builder: (BuildContext context) {
return new SecondScreen(userbean: widget.userbean);
},
));
refreshData.then((res) {
print("TEST First screen : ${res.name}");
});
Then Object will change with new values.