how to create toggle button in flutter code example

Example 1: flutter toggle button example

import 'package:flutter/material.dart';

    class SamplePage extends StatefulWidget {
    @override
    _SamplePageState createState() => _SamplePageState();
    }

    class _SamplePageState extends State<SamplePage> {
    List<bool> isSelected;

    @override
    void initState() {
        isSelected = [true, false];
        super.initState();
    }

    @override
    Widget build(BuildContext context) {
        return Scaffold(
        appBar: AppBar(
            title: Text('ToggleButtons'),
        ),
        body: Center(
            child: Column(
            mainAxisAlignment: MainAxisAlignment.spaceEvenly,
            children: <Widget>[
                ToggleButtons(
                borderColor: Colors.black,
                fillColor: Colors.grey,
                borderWidth: 2,
                selectedBorderColor: Colors.black,
                selectedColor: Colors.white,
                borderRadius: BorderRadius.circular(0),
                children: <Widget>[
                    Padding(
                    padding: const EdgeInsets.all(8.0),
                    child: Text(
                        'Open 24 Hours',
                        style: TextStyle(fontSize: 16),
                    ),
                    ),
                    Padding(
                    padding: const EdgeInsets.all(8.0),
                    child: Text(
                        'Custom Hours',
                        style: TextStyle(fontSize: 16),
                    ),
                    ),
                ],
                onPressed: (int index) {
                    setState(() {
                    for (int i = 0; i < isSelected.length; i++) {
                        isSelected[i] = i == index
                    }
                    });
                },
                isSelected: isSelected,
                ),
            ],
            ),
        ),
        );
    }
    }

Example 2: toggle button flutter

ToggleButtons(
  children: <Widget>[
    Icon(Icons.ac_unit),
    Icon(Icons.call),
    Icon(Icons.cake),
  ],
  onPressed: (int index) {
    setState(() {
      for (int buttonIndex = 0; buttonIndex < isSelected.length; buttonIndex++) {
        if (buttonIndex == index) {
          isSelected[buttonIndex] = true;
        } else {
          isSelected[buttonIndex] = false;
        }
      }
    });
  },
  isSelected: isSelected,
),