Flutter Radio Button -Topperworld

Flutter Radio Button

Flutter Radio buttons are a user interface component in Flutter, Google’s UI toolkit for building natively compiled applications for mobile, web, and desktop. Radio buttons, also known as option buttons or radio options, allow users to select a single option from a predefined list of choices. In Flutter, radio buttons are typically implemented using the Radio widget, often wrapped within a RadioListTile for a complete visual representation including labels and optional secondary widgets.

In the below PDF we discuss about Radio Buttons in detail in simple language, Hope this will help in better understanding.

Flutter Radio Button Example:

Let’s walk through a simple example of implementing radio buttons in a Flutter application. Assume we have a list of colors, and we want the user to select their favorite one using radio buttons.

import 'package:flutter/material.dart';

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

class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
String _selectedColor;

@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('Flutter Radio Buttons'),
),
body: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
RadioListTile<String>(
title: Text('Red'),
value: 'Red',
groupValue: _selectedColor,
onChanged: (value) {
setState(() {
_selectedColor = value;
});
},
),
RadioListTile<String>(
title: Text('Green'),
value: 'Green',
groupValue: _selectedColor,
onChanged: (value) {
setState(() {
_selectedColor = value;
});
},
),
RadioListTile<String>(
title: Text('Blue'),
value: 'Blue',
groupValue: _selectedColor,
onChanged: (value) {
setState(() {
_selectedColor = value;
});
},
),
],
),
),
);
}
}

In this example, we define a MyApp widget as a StatefulWidget since the selected color will change over time. The _selectedColor variable holds the currently selected color. We use RadioListTile for each color option, providing a label, value, current group value, and an onChanged callback to handle selection changes.

Customizing Flutter Radio Buttons:

While Flutter provides default styling for radio buttons, you can customize their appearance to better align with your app’s design language. Here are a few ways to customize Flutter radio buttons:

Custom Icons: You can replace the default radio icon with a custom icon using the activeColor property of RadioListTile.
Styling Text: Modify the text style of the labels using the title property of RadioListTile.
Container Decoration: Wrap the RadioListTile with a Container widget to apply custom decorations like borders or shadows.

Conclusion:

In conclusion, Flutter radio buttons are a fundamental component for user input in mobile applications. By understanding their implementation, customization options, and best practices, you can leverage radio buttons effectively to enhance user interaction and streamline the user experience in your Flutter apps. Whether you’re building a simple form or a complex selection interface, Flutter’s radio buttons provide the flexibility and functionality you need to create intuitive and engaging user interfaces.