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Flutter – Sharing Data Among Flutter Pages

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  • Last Updated : 21 Feb, 2022

In this article, we are going to find the solution for the problem statement “Import/send data from one page to another in flutter”. Before going into the topic, there are some pre-requisites.

Pre-requisites:

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

Key Terminologies Used:

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 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 nextpage, we use MaterialPageRoute class with 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 button.
 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

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


Step 4: Create 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 to 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

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:

Resulted App


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