Nilen Patel Inc.

Tutorial and code of Checkbox and Radio Buttons in Flutter. Copy and paste the below code as per your requirements.

import 'package:flutter/material.dart';

void main() => runApp(MaterialApp(
      debugShowCheckedModeBanner: false,
      home: MyHomePage(),
    ));

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  bool a = false;
  bool b = false;
  bool c = false;
  bool d = false;
  bool e = false;
  String radioButtonItem = 'ONE';
  int id = 1;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text("Checkboxes and Radio Button Demo"),
          centerTitle: true,
        ),
        body: Center(
            child: Column(
          children: [
            SizedBox(
              height: 170,
            ),
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: <Widget>[
                    Transform.scale(
                      scale: 2.0,
                      child: Checkbox(
                        shape: RoundedRectangleBorder(
                          borderRadius: BorderRadius.circular(4.0),
                        ),
                        activeColor: Colors.amberAccent,
                        checkColor: Colors.redAccent,
                        splashRadius: 20,
                        value: a,
                        onChanged: (bool value) {
                          setState(() {
                            a = value;
                          });
                        },
                      ),
                    )
                  ],
                ),
                SizedBox(
                  width: 30,
                ),
                Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: <Widget>[
                    Transform.scale(
                      scale: 2.0,
                      child: Checkbox(
                        shape: RoundedRectangleBorder(
                          borderRadius: BorderRadius.circular(4.0),
                        ),
                        activeColor: Colors.amberAccent,
                        checkColor: Colors.redAccent,
                        splashRadius: 20,
                        value: b,
                        onChanged: (bool value) {
                          setState(() {
                            b = value;
                          });
                        },
                      ),
                    )
                  ],
                ),
                SizedBox(
                  width: 30,
                ),
                Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: <Widget>[
                    Transform.scale(
                      scale: 2.0,
                      child: Checkbox(
                        shape: CircleBorder(),
                        activeColor: Colors.lightGreenAccent,
                        checkColor: Colors.green,
                        splashRadius: 20,
                        value: c,
                        onChanged: (bool value) {
                          setState(() {
                            c = value;
                          });
                        },
                      ),
                    )
                  ],
                ),
                SizedBox(
                  width: 30,
                ),
                Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: <Widget>[
                    Transform.scale(
                      scale: 2.0,
                      child: Checkbox(
                        shape: CircleBorder(),
                        activeColor: Colors.lightGreenAccent,
                        checkColor: Colors.green,
                        splashRadius: 20,
                        value: d,
                        onChanged: (bool value) {
                          setState(() {
                            d = value;
                          });
                        },
                      ),
                    )
                  ],
                ),
              ],
            ),
            SizedBox(
              height: 90,
            ),
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Column(
                  children: <Widget>[
                    Padding(
                        padding: EdgeInsets.all(14.0),
                        child: Text(
                            'Selected Radio Item = ' + '$radioButtonItem',
                            style: TextStyle(fontSize: 21))),
                    Row(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: <Widget>[
                        Radio(
                          fillColor: MaterialStateColor.resolveWith((states) => Colors.red),
                          value: 1,
                          groupValue: id,
                          onChanged: (val) {
                            setState(() {
                              radioButtonItem = 'ONE';
                              id = 1;
                            });
                          },
                        ),
                        Text(
                          'ONE',
                          style: new TextStyle(fontSize: 17.0),
                        ),
                        Radio(
                          fillColor: MaterialStateColor.resolveWith((states) => Colors.green),
                          value: 2,
                          groupValue: id,
                          onChanged: (val) {
                            setState(() {
                              radioButtonItem = 'TWO';
                              id = 2;
                            });
                          },
                        ),
                        Text(
                          'TWO',
                          style: new TextStyle(
                            fontSize: 17.0,
                          ),
                        ),
                        Radio(
                          fillColor: MaterialStateColor.resolveWith((states) => Colors.blue),
                          value: 3,
                          groupValue: id,
                          onChanged: (val) {
                            setState(() {
                              radioButtonItem = 'THREE';
                              id = 3;
                            });
                          },
                        ),
                        Text(
                          'THREE',
                          style: new TextStyle(fontSize: 17.0),
                        ),
                      ],
                    ),
                  ],
                ),
              ],
            ),
          ],
        )));
  }
}