An adaptive UI is an integral part of any application. As applications nowadays have to function on a wide range of devices ranging from tablets, PCs, and mobile with varying screen sizes. This is where the application needs to adjust itself according to the size of the screen irrespective of the size of the content of the application.
Flutter provides with an auto_size_text dependency that adapts the screen according to the screen size and manipulates itself to provide with adaptive user experience. The above dependency adjusts the size of the text in the application. In this article, we will explore the same dependency in detail by building a simple application.
Steps to implement auto_size_text in Flutter
Step 1 : Adding the Dependency
To add the dependency to the pubspec.yaml file, add the auto_size_text to the flutter dependency as shown below:
dependencies:
auto_size_text: ^3.0.0
Now run the below command in terminal.
flutter pub get
Step 2 : Importing the Dependency
The dependency can be imported into the main.dart file as follows:
import 'package:auto_size_text/auto_size_text.dart';
Step 3 : Creating the App structure
Use the StatelessWidget to give a simple structure to the app as shown below:
Dart class App extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( appBar:AppBar(title: Text('GeeksForGeeks'), backgroundColor: Colors.green,), ), ), ); } }
Step 4 : Adding a Sample text
A text inside the body of the application can be added inside a sizedBox as shown below:
Dart child: SizedBox( width: 200.0, height: 140.0, child: AutoSizeText( 'Hello Geeks!. We will break this line into 3 lines !!', style: TextStyle(fontSize: 30.0), maxLines: 3, ), ),
To know more about SizedBox in flutter refer this article: Flutter – SizedBox Widget
Complete Source Code(main.dart):
Dart import 'package:auto_size_text/auto_size_text.dart'; import 'package:flutter/material.dart'; void main() { runApp(App()); } class App extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( appBar:AppBar(title: Text('GeeksForGeeks'), backgroundColor: Colors.green,), body: Center( child: SizedBox( width: 200.0, height: 140.0, child: AutoSizeText( 'Hello Geeks!. We will break this line into 3 lines !!', style: TextStyle(fontSize: 30.0), maxLines: 3, ), ), ), ), ); } } Output:
If you wish to make the text fit in 2 lines instead of 3 line, make the below changes to the code.
main.dart:
Dart import 'package:auto_size_text/auto_size_text.dart'; import 'package:flutter/material.dart'; // Main function to run the app void main() { runApp(MyApp()); } // MyApp is a stateless widget class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( debugShowCheckedModeBanner: false, home: Scaffold( appBar: AppBar( title: Text('GeeksForGeeks'), backgroundColor: Colors.green, foregroundColor: Colors.white, ), body: Center( child: SizedBox( width: 200.0, height: 140.0, child: AutoSizeText( 'Hello Geeks! We will break this line into 3 lines !!', style: TextStyle(fontSize: 30.0), maxLines: 2, ), ), ), ), ); } } Output:
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