Flutter - Dart - Get the type of the device based on device width.

form_factor.dart

import 'package:flutter/material.dart';

enum ScreenType {
  desktop,
  tablet,
  handset,
  watch,
}

class FormFactor {
  static double desktop = 900;
  static double tablet = 600;
  static double handset = 300;

  static ScreenType getFormFactor(BuildContext context) {
    // Use .shortestSide to detect device type regardless of orientation
    double deviceWidth = MediaQuery.of(context).size.width; // or .shortestSide
    if (deviceWidth > FormFactor.desktop) return ScreenType.desktop;
    if (deviceWidth > FormFactor.tablet) return ScreenType.tablet;
    if (deviceWidth > FormFactor.handset) return ScreenType.handset;
    return ScreenType.watch;
  }
}