import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      home: MyWidget(),
    ),
  );
}

class MyWidget extends StatefulWidget {
  const MyWidget({Key? key}) : super(key: key);

  @override
  State<MyWidget> createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  RangeValues _values = const RangeValues(0.2, 0.6);
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: RangeSlider(
          divisions: 8,
          values: _values,
          labels: RangeLabels(
            _values.start.toString(),
            _values.end.toString(),
          ),
          onChanged: (values) {
            setState(() {
              _values = values;
            });
          },
        ),
      ),
    );
  }
}