Flutter passing data between screens showing null data after passing-CodePudding

Hi i was experienced ionic developer but i am new to flutter i was trying to pass data between screens in flutter but when it navigates it shows null value , in debug mode before navigate there is values after navigate it shows null , here is my code please correct my code thanks.

Screen 1

import 'package:flutter/material.dart';
import 'package:date_field/date_field.dart';
import 'package:headletter/screens/Add_horoscope/marriage_info.dart';

class AddBasicInfo extends StatefulWidget {
  const AddBasicInfo({Key? key}) : super(key: key);

  @override
  _AddBasicInfoState createState() => _AddBasicInfoState();
}

class _AddBasicInfoState extends State<AddBasicInfo>{
 
  @override
  void initState() {
    super.initState();
  }
  Widget build(BuildContext context) {
    return MaterialApp()....
        bottomNavigationBar: BottomAppBar(
          child: GestureDetector(
            onTap: (){
             final data1 = [
               {
                 "Name": inputName.text,
                 "Gender": _selectedGender,
                 "DOB":dobDate,
                 "DobTime":dobTime,
                 "Place": birthPlace.text,
                 "Landmark": landmark.text,
                 "birthNo": _selectedChild
               }
             ];
           
                  final String passingValue = "checking for passing";
                  Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) =>
                            MarriageInfo(passingValue: passingValue)),
                  );
                }
              }
          
            },

Screen 2

class MarriageInfo extends StatefulWidget {
  final String passingValue;
  const MarriageInfo({Key? key, required this.passingValue}) : super(key: key);
  @override
  _MarriageInfoState createState() => _MarriageInfoState();
}

CodePudding user response：

Far now this is correct but while using passingValue on Screen2 you have to use widget.passingValue e.g. print(widget.passingValue);

CodePudding user response：

you are using statefulwidget
You can describe constructor of statefullwidget like that

final String passingValue;

const MarriageInfo(this.number);

and than you can excess this value by

widget.passingValue

CodePudding user response：

You should use widget.passingValue instead of just that variable name. The property is assigned to that widget, not to that state class.