Can we check the device to be smartphone or tablet in Flutter?

// The equivalent of the "smallestWidth" qualifier on Android.var shortestSide = MediaQuery.of(context).size.shortestSide;// Determine if we should use mobile layout or not, 600 here is// a common breakpoint for a typical 7-inch tablet.final bool useMobileLayout = shortestSide < 600;

Copied from https://flutter.rocks/2018/01/28/implementing-adaptive-master-detail-layouts/

Thanks @Sergi

You can use this if you don't have an access to BuildContext. I took it out from sdk/flutter/packages/flutter/lib/src/widgets/app.dart:1252.

  String getDeviceType() {    final data = MediaQueryData.fromWindow(WidgetsBinding.instance.window);    return data.size.shortestSide < 600 ? 'phone' :'tablet';  }

One of the ways is calculated diagonal for screen resolution.

import 'package:flutter/widgets.dart';import 'dart:math';class TabletDetector {  // iPhone 6S   // |_ [portrait]  //    |_ size: 375.0x667.0, pixelRatio: 2.0, pixels: 750.0x1334.0  //       |_ diagonal: 765.1888655750291  // |_ [horizontal]  //    |_ size: 667.0x375.0, pixelRatio: 2.0, pixels: 1334.0x750.0  //       |_ diagonal: 765.1888655750291  // iPhone X   // |_ [portrait]  //    |_ size: 375.0x812.0, pixelRatio: 3.0, pixels: 1125.0x2436.0  //       |_ diagonal: 894.4098613052072  // |_ [horizontal]  //    |_ size: 812.0x375.0, pixelRatio: 3.0, pixels: 2436.0x1125.0  //       |_ diagonal: 894.4098613052072  // iPhone XS Max   // |_ [portrait]  //    |_ size: 414.0x896.0, pixelRatio: 3.0, pixels: 1242.0x2688.0  //       |_ diagonal: 987.0217829409845  // |_ [horizontal]  //    |_ size: 896.0x414.0, pixelRatio: 3.0, pixels: 2688.0x1242.0  //       |_ diagonal: 987.0217829409845  // iPad Pro (9.7-inch)   // |_ [portrait]  //    |_ size: 768.0x1024.0, pixelRatio: 2.0, pixels: 1536.0x2048.0  //       |_ diagonal: 1280.0  // |_ [horizontal]  //    |_ size: 1024.0x768.0, pixelRatio: 2.0, pixels: 2048.0x1536.0  //       |_ diagonal: 1280.0  // iPad Pro (10.5-inch)   // |_ [portrait]  //    |_ size: 834.0x1112.0, pixelRatio: 2.0, pixels: 1668.0x2224.0  //       |_ diagonal: 1390.0  // |_ [horizontal]  //    |_ size: 1112.0x834.0, pixelRatio: 2.0, pixels: 2224.0x1668.0  //       |_ diagonal: 1390.0  // iPad Pro (12.9-inch)   // |_ [portrait]  //    |_ size: 1024.0x1366.0, pixelRatio: 2.0, pixels: 2048.0x2732.0  //       |_ diagonal: 1707.2000468603555  // |_ [horizontal]  //    |_ size: 1366.0x1024.0, pixelRatio: 2.0, pixels: 2732.0x2048.0  //       |_ diagonal: 1707.2000468603555  static bool isTablet(MediaQueryData query) {    var size = query.size;    var diagonal = sqrt(      (size.width * size.width) +       (size.height * size.height)    );    /*    print(      'size: ${size.width}x${size.height}\n'      'pixelRatio: ${query.devicePixelRatio}\n'      'pixels: ${size.width * query.devicePixelRatio}x${size.height * query.devicePixelRatio}\n'      'diagonal: $diagonal'    );    */    var isTablet = diagonal > 1100.0;    return isTablet;  }}