navigation_passingdata_usingclass

//file main.dart

import 'package:flutter/material.dart';
import 'firstscreen.dart';
import 'secondscreen.dart';

void main() {
  runApp(MaterialApp(
    debugShowCheckedModeBanner: false,
    title: 'Passing Data',
    home: FirstScreen(),
    //guna Routing
    routes: <String, WidgetBuilder> {
    '/screen1': (BuildContext context) => new FirstScreen(),
    '/screen2': (BuildContext context) => new SecondScreen(),
    //----end define route
  },

  ));
}

//end of file main.dart




//file firstscreen.dart

import 'package:flutter/material.dart';
import 'myobject.dart';
import 'secondscreen.dart';

class FirstScreen extends StatefulWidget {
  @override
  _FirstScreenState createState() => new _FirstScreenState();
}

class _FirstScreenState extends State<FirstScreen> {
  final _tcname = TextEditingController();
  final _tcage = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('Screen 1'),
        ),
        body: ListView(
          children: <Widget>[
            ListTile(
              title: TextField(
                controller: _tcname,
                decoration: InputDecoration(
                    border: InputBorder.none, hintText: 'Student Name'),
              ),
            ),
            ListTile(
              title: TextField(
                controller: _tcage,
                decoration: InputDecoration(
                    border: InputBorder.none, hintText: 'Student Age'),
              ),
            ),
            ListTile(
              title: RaisedButton(
                  child: Text("Next"),
                  onPressed: () {
                    //from parameter 
                    // Navigator.push(context, MaterialPageRoute(builder:(context)
                    //   => new SecondScreen(value: _textController.text)));
                    // Navigate to second screen with data

                    //to using Class
                    Navigator.push(
                        context,
                        MaterialPageRoute(
                            builder: (context) => SecondScreen(
                                student: Student(_tcname.text, _tcage.text))));
                  }),
            )
          ],
        ));
  }
}

//end file firstscreen.dart



//file secondscreen.dart

import 'package:flutter/material.dart';
import 'myobject.dart'; //object class

class SecondScreen extends StatefulWidget {
  //Create an Object class to receive the Passed Data from _TextFieldController
  final Student student;
  //This is how it goes to Secondscreen using key value
  SecondScreen({Key key, this.student}) : super (key: key);

  @override
  _SecondScreenState createState() => new _SecondScreenState();
}

class _SecondScreenState extends State<SecondScreen> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Screen 2"),
      ),
      body: Center(
        //Display The Object received
        child: Text('Student Data  \nname: ${widget.student.name} \nage: ${widget.student.age}', style: TextStyle(fontSize: 20.0),),
      ),
    );
  }
}

//note: you can delete ${widget.student.name} to ${student.name} if using stateless class

//end of file secondscreen.dart



//file myobject.dart

// Data need to sent second screen
//You can create a class
class Student {
  final String name;
  final String age;

  Student(this.name, this.age);
}

// end of file myobject.dart