How to Add Range Slider in Flutter

In this example, we are going to show you to add a range slider for two values with the RangeSlider widget in Flutter. Range slider is important for components like price slider, or any kind of range configuration. See the example below:

double startval = 0, endval = 0.5;
//iniital value for start range and end range

RangeSlider(
  //by default, min-max: 0-1
  values: RangeValues(startval, endval), 
  onChanged: (RangeValues value) {  
        setState(() {
            startval = value.start;
            endval = value.end;
        });
  }, 
)

By default, the minimum and maximum range will be 0 to 1, so you have to pass the start and end value in between 0 and 1. If you want a greater number of ranges, then you can set your own min and max values like below:

//iniital value for start range and end range
double startval1 = 20, endval1 = 70;

RangeSlider(
  min: 0, 
  max: 100,
  values: RangeValues(startval1, endval1), 
  onChanged: (RangeValues value) {  
        setState(() {
            startval1 = value.start;
            endval1 = value.end;
        });
  }, 
)

You can also add slide interval division and label for values too.

//iniital value for start range and end range
double startval1 = 20, endval1 = 70;

RangeSlider(
  min: 0, 
  max: 100,
  divisions: 10, //slide interval
  labels: RangeLabels("Rs. $startval1", "Rs. $endval1"),
  values: RangeValues(startval1, endval1), 
  onChanged: (RangeValues value) {  
        setState(() {
            startval1 = value.start;
            endval1 = value.end;
        });
  }, 
)

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Home(),
    );
  }
}

class Home extends StatefulWidget{
  @override
  _HomeState createState() => _HomeState();
}

class _HomeState extends State<Home> { 
  
  double startval = 0, endval = 0.5;
  //iniital value for start range and end range
  double startval1 = 20, endval1 = 70;
  
  @override
  Widget build(BuildContext context) { 
    return  Scaffold(
          appBar: AppBar(
            title: Text("RangeSlider in Flutter"),
            backgroundColor: Colors.redAccent
          ),
          body: Container(
            padding: EdgeInsets.only(top:20, left:20, right:20),
            alignment: Alignment.topLeft,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [ 

                 Text("Start Value: $startval", style:TextStyle(fontSize: 20)), 
                 Text("End Value: $endval", style:TextStyle(fontSize: 20)), 

                 Text("Start Value1: $startval1", style:TextStyle(fontSize: 20)), 
                 Text("End Value1: $endval1", style:TextStyle(fontSize: 20)), 

                  RangeSlider(
                    //by default, min-max: 0-1
                    values: RangeValues(startval, endval), 
                    onChanged: (RangeValues value) {  
                          setState(() {
                              startval = value.start;
                              endval = value.end;
                          });
                    }, 
                  ),

                  Padding(padding: EdgeInsets.all(20)),

                  RangeSlider(
                    min: 0, 
                    max: 100,
                    divisions: 10, //slide interval
                    labels: RangeLabels("Rs. $startval1", "Rs. $endval1"),
                    values: RangeValues(startval1, endval1), 
                    onChanged: (RangeValues value) {  
                          setState(() {
                              startval1 = value.start;
                              endval1 = value.end;
                          });
                    }, 
                  )
            ],)
          )
       );
  }
}