Flutter – Sharing Data Among Flutter Pages
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:
- Basics of dart programming language.
- Setting up Flutter in VS code or Setting up Flutter in Android Studio.
- Creating first flutter app | Hello World.
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
.png)
