我们可以在Flutter中检查设备是智能手机还是平板电脑吗?

问题描述 投票:0回答:12

我实际上是想弄清楚该应用程序是在我的 Flutter 应用程序中运行在智能手机还是平板电脑上,但是包

device_info
只能告诉我们该设备,而不能告诉我该设备是智能手机还是平板电脑。

有没有办法通过检查设备的尺寸来做到这一点?

flutter dart tablet smartphone devicecheck
12个回答
56
投票
// 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;

复制自https://flutter.rocks/2018/01/28/implementing-adaptive-master-detail-layouts/

谢谢@Sergi


55
投票

如果您无权访问 BuildContext,则可以使用它。我从

sdk/flutter/packages/flutter/lib/src/widgets/app.dart:1252
里拿出来的。

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

20
投票

其中一种方法是计算屏幕分辨率的对角线。

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;
  }
}

15
投票

尽管 iOS 在手机和平板电脑之间有明显的分离,但这在 Android 中不会发生。您需要根据屏幕宽度进行选择。

查看这篇文章以查看如何区分的示例:https://flutter.rocks/2018/01/28/implementing-adaptive-master-detail-layouts/


15
投票

这里与其他问题相同,但返回

enum
而不是
bool
String
。由于它更封闭,所以使用起来更容易。

import 'package:flutter/widgets.dart';

enum DeviceType { Phone, Tablet }

DeviceType getDeviceType() {
  final data = MediaQueryData.fromWindow(WidgetsBinding.instance.window);
  return data.size.shortestSide < 550 ? DeviceType.Phone : DeviceType.Tablet;
}

感谢@Chandler 和@bakua 的灵感:·)


9
投票

对于 Android,正如 @Chandler 所说,您应该检查屏幕的最小尺寸,但对于 iOS,您可以使用 device_info 包以 100% 的准确度识别它是否是 iPad:

添加

pubspec.yaml
:

device_info:                 ^0.4.2+4

  static Future<bool> isTablet(BuildContext context) async {

    if (Platform.isIOS) {
      DeviceInfoPlugin deviceInfo = DeviceInfoPlugin();
      IosDeviceInfo iosInfo = await deviceInfo.iosInfo;

      return iosInfo.model.toLowerCase() == "ipad";
    } else {
      // 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.
      return shortestSide > 600;
    }
  }

7
投票

2023,Dart 3 解决方案的灵感来自 @bakua 的答案,还有 这个答案

bool get isTablet {
  final firstView = WidgetsBinding.instance.platformDispatcher.views.first;
  final logicalShortestSide = firstView.physicalSize.shortestSide / firstView.devicePixelRatio;
  return logicalShortestSide > 600;
}


1
投票

通常 Android 平板电脑和 iPad 的宽高比(宽度:高度)在 0.75 ~ 1.4 范围内,以下是最快的检查方法。我们可以根据长宽比调整UI。

bool isTablet;
double ratio = MediaQuery.of(context).size.width / MediaQuery.of(context).size.height;
if( (ratio >= 0.74) && (ratio < 1.5) )
{
  isTablet = true;
} else{
  isTablet = false;
}

1
投票

您可以使用

sizer
包中的 DeviceType.tablet。你会这样做:

SizerUtil.deviceType == DeviceType.tablet

该字段是使用此逻辑设置的,这与此处最接受的答案相同。我已经使用 sizer 来使我的应用程序具有响应能力,因此使用它来确定设备是否是平板电脑很方便。


0
投票

您可以使用 flutter 中的 device_info_plushttps://pub.dev/packages/device_info_plus

static Future<bool> isTablet(BuildContext context) async {
bool isTab=false;
if (Platform.isIOS) {
  DeviceInfoPlugin deviceInfo = DeviceInfoPlugin();
  IosDeviceInfo iosInfo = await deviceInfo.iosInfo;
  if(iosInfo.model?.toLowerCase() == "ipad"){
    isTab=true;
  }else{
    isTab=false;
  }
  return isTab;
} else {
  var shortestSide = MediaQuery.of(context).size.shortestSide;
  if(shortestSide > 600){
    isTab=true;
  }else{
    isTab=false;
  }
  return isTab;
}}

打电话..

Future checkDeviceType() async {

bool iPad = await isTablet(context);
    
    if(iPad){
       //write your logic here..
     }
}

0
投票

创建 dart 文件

"size_config.dart"

import 'dart:io';
import 'package:flutter/widgets.dart';
import 'dart:async';
import 'package:device_info_plus/device_info_plus.dart';

class SizeConfig {
  static late MediaQueryData _mediaQueryData;
  static late double screenWidth;
  static late double screenHeight;
  static late double blockSizeHorizontal;
  static late double blockSizeVertical;
  static late double safeBlockHorizontal;
  static late double safeBlockVertical;
  static bool isIpad = false;

  void init(BuildContext context) async {
    _mediaQueryData = MediaQuery.of(context);
    screenWidth = _mediaQueryData.size.width;
    screenHeight = _mediaQueryData.size.height;
    blockSizeHorizontal = screenWidth / 100;
    blockSizeVertical = screenHeight / 100;
    isIpad = await isTablet(context);
  }

  static Future<bool> isTablet(BuildContext context) async {
    bool isTab = false;
    if (Platform.isIOS) {
      DeviceInfoPlugin deviceInfo = DeviceInfoPlugin();
      IosDeviceInfo iosInfo = await deviceInfo.iosInfo;
      if (iosInfo.model.toLowerCase() == "ipad") {
        isTab = true;
      } else {
        isTab = false;
      }
      return isTab;
    } else {
      var shortestSide = MediaQuery.of(context).size.shortestSide;
      if (shortestSide > 600) {
        isTab = true;
      } else {
        isTab = false;
      }
      return isTab;
    }
  }
}

打电话

@override
  Widget build(BuildContext context) {
    SizeConfig().init(context);

    var height = SizeConfig.screenHeight;
    var width = SizeConfig.screenWidth;

    bool isIpad = SizeConfig.isIpad;

0
投票

我根据其他答案编写了这个上下文扩展,它对我有用:

extension ContextExt on BuildContext {
    bool get isPhone => MediaQuery.of(this).size.width < 600.0;
    bool get isTablet => MediaQuery.of(this).size.width >= 600.0;
}

用途:

final iconSize = context.isTablet ? 50.0 : 30.0;
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