Slider

Slider(
  min: 10000,
  max: 1000000,
  value: maxNumber,
  onChanged: (double val) {
    setState(() {
      maxNumber = val;
    });
  },
),
Dart
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// state
class _SettingsScreenState extends State<SettingsScreen> {
  double maxNumber = 1000;  // define variable here
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    maxNumber = widget.maxNumber.toDouble();
  }

// function
void onSliderMove(double val) {
  setState(() {
    maxNumber = val;
  });
}
Dart
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