How to Import Data From One Page to Another in Flutter?

Flutter is Google’s Mobile SDK to build native iOS and Android, Desktop (Windows, Linux, macOS), Web apps from a single codebase. When building applications with Flutter everything towards Widgets – the blocks with which the flutter apps are built. They are structural elements that ship with a bunch of material design-specific functionalities and new widgets can be composed out of existing ones too. In this article, we are going to find the solution for the problem statement “How to import/send data from one page to another in flutter”. Before going into the topic, there are some pre-requisites.

Pre-requisites:

• Basics of dart programming language.
• Setting up Flutter in VS code or Setting up Flutter in Android Studio.
• Creating first flutter app.

Let us dive into the article by creating a simple app with two pages. We have used VS Code IDE for the development.

Terminologies we are going to use in this app:

• Navigator class.
• MaterialPageRoute class.
• TextEditingController class.

Step by Step Implementation

Step 1:

Creating a new Flutter app:

• Use the command ctrl+shift+p to open Command Palette.
• Type Flutter: New Project in the palette.

Note: If you are using Android Studio IDE, then use the path File-> New-> New Flutter Project.

Step 2:

Adding Textfield to get data from users:

• Create Textfields to get input from the user.
• Create TextEditingController classes for the appropriate TextField.

Syntax:

TextEditingController object_name = TextEditingController();

Mention the object name of the Controller inside the TextField class using the controller attribute. Refer to below code,

child: TextField(
            // controller attribute. 
               controller: controller_object_name,
               decoration: InputDecoration(
                  border: OutlineInputBorder(),
                  labelText: "Enter your Phone Number"
               ),
       ),

Step 3:

Sending data and Navigating to the next page:

• To navigate to the next page we use Navigator with the main.dart’s context.
• To send the data as arguments while navigating to the next page, we use MaterialPageRoute class with the builder for the nextpage class’s constructor.
• We should create a Button to perform the above functions in the onPressed: () function by clicking it. For this, we are going to use ElevatedButton class for the creation of buttons.

ElevatedButton(
                onPressed: () {
                  // Navigator for next page.
                  Navigator.of(context).push(
                    MaterialPageRoute(
                        // Builder for the nextpage
                        // class's constructor.
                        builder: (context) => nextpage(
                              name: _name.text,
                              email: _email.text,
                              phoneno: _phoneno.text,
                            )),
                          );
                    },
                child: Text("SEND")
                ),

main.dart file:

Dart

import 'package:flutter/material.dart';
import 'package:geeksforgeeks/nextpage.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.green,
      ),
      home: const MyHomePage(title: 'GeeksForGeeks'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);
  final String title;
  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  // To listen to the changes in the textfield.
  TextEditingController _name = TextEditingController();
  TextEditingController _email = TextEditingController();
  TextEditingController _phoneno = TextEditingController();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Padding(
              padding: const EdgeInsets.all(25),
              child: TextField(
                // To set the appropriate
                // controller to the text field.
                controller: _name,
                decoration: InputDecoration(
                    border: OutlineInputBorder(), labelText: "Enter your Name"),
              ),
            ),
            Padding(
              padding: const EdgeInsets.all(25),
              child: TextField(
                controller: _email,
                decoration: InputDecoration(
                    border: OutlineInputBorder(),
                    labelText: "Enter your Email"),
              ),
            ),
            Padding(
              padding: const EdgeInsets.all(25),
              child: TextField(
                controller: _phoneno,
                decoration: InputDecoration(
                    border: OutlineInputBorder(),
                    labelText: "Enter your Phone Number"),
              ),
            ),
            // Button to go to the nextpage.
            ElevatedButton(
                onPressed: () {
                  // Navigator to the next page.
                  Navigator.of(context).push(
                    MaterialPageRoute(
                        // Builder for the nextpage
                          // class's constructor.
                        builder: (context) => nextpage(
                              // Date as arguments to
                                // send to next page.
                              name: _name.text,
                              email: _email.text,
                              phoneno: _phoneno.text,
                            )),
                  );
                },
                child: Text("SEND"))
          ],
        ),
      ),
    );
  }
}

Step 4:

Create a new dart File:

• Using the path File-> New File creates a new dart file with name nextpage.dart inside the lib folder.
• Import the package ‘package:flutter/material.dart’. This package is used to implement the material design of the app.
• Create class nextpage() which extends StatelessWidget.
• Create a constructor for the class to receive the arguments from the previous page’s class and save the arguments as variables.

String name, email, phoneno;
nextpage({required this.name, required this.email, required this.phoneno});

Create Textfields and its appropriate TextEditingController and set the data from the previous page in the respective text fields using the text attribute. Refer to the below code,

TextEditingController object_name = TextEditingController(text: data);

nextpage.dart file:

Dart

import 'package:flutter/material.dart';

class nextpage extends StatelessWidget {
  String name, email, phoneno;

  // Constructor to get the data from the previous page.
  nextpage({required this.name, required this.email, required this.phoneno});

  @override
  Widget build(BuildContext context) {
    // To listen to the changes in the textfield.
    TextEditingController _name = TextEditingController(text: name);
    TextEditingController _email = TextEditingController(text: email);
    TextEditingController _phoneno = TextEditingController(text: phoneno);

    return Scaffold(
      appBar: AppBar(
        title: Text('Next Page'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Padding(
              padding: const EdgeInsets.all(25),
              child: TextField(
                // To set the appropriate controller
                // to the text field.
                controller: _name,
                decoration: InputDecoration(
                  border: OutlineInputBorder(),
                  labelText: "Name",
                ),
              ),
            ),
            Padding(
              padding: const EdgeInsets.all(25),
              child: TextField(
                controller: _email,
                decoration: InputDecoration(
                  border: OutlineInputBorder(),
                  labelText: "Email",
                ),
              ),
            ),
            Padding(
              padding: const EdgeInsets.all(25),
              child: TextField(
                controller: _phoneno,
                decoration: InputDecoration(
                  border: OutlineInputBorder(),
                  labelText: "Number",
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

Output: