您可以将这个扩展文件(platform_ext.dart)添加到项目中并调用任何对象

import 'dart:io';
import 'package:flutter/foundation.dart' show kIsWeb;

extension Target on Object {
  bool isAndroid() {
    return Platform.isAndroid;
  } 
  bool isIOS() {
    return Platform.isIOS;
  } 
  bool isLinux() {
  return Platform.isLinux;
  } 
  bool isWindows() {
  return Platform.isWindows; 
  }
  bool isMacOS() {
  return Platform.isMacOS; 
  }
  bool isWeb() {
  return kIsWeb; 
  }
  // ···
}

只需导入文件并调用它

   import 'platform_ext.dart';
        ....
        @override
          Widget build(BuildContext context) {
            return isAndroid()? Text("Android"):Text("Not Android");
          }

Dart主机平台检查。

导入'dart:io'作为io;

_checkingHostPlatform(){
    if(IO.Platform.isAndroid){
      //Execute code for android
    }else if(IO.Platform.isIOS){
      //Execute code for iOS
    }else{
      //Execute code for other platforms
    }
  }

import 'dart:io' show Platform;

if (Platform.isAndroid) {
  // Android-specific code
} else if (Platform.isIOS) {
  // iOS-specific code
}else if (Platform.isFuchsia) {
  // Fuchsia-specific code
}else if (Platform.isLinux) {
  // Linux-specific code
}else if (Platform.isMacOS) {
  // MacOS-specific code
}else if (Platform.isWindows) {
  // Windows-specific code
}else if (Platform.isWindows) {
  // Windows-specific code
}

网络

import 'package:flutter/foundation.dart' show kIsWeb;

if (kIsWeb) {
  // running on the web!
} else {
  // NOT running on the web! You can check for additional platforms here.
}

您可以将此扩展添加到项目中

import 'package:flutter/material.dart';

extension PlatformExtension on BuildContext {
  bool get isMobile =>
      Theme.of(this).platform == TargetPlatform.iOS ||
      Theme.of(this).platform == TargetPlatform.android;

  bool get isDesktop =>
      Theme.of(this).platform == TargetPlatform.macOS ||
      Theme.of(this).platform == TargetPlatform.windows ||
      Theme.of(this).platform == TargetPlatform.linux;
}

extension TargetPlatformExtension on TargetPlatform {
  bool get isMobile =>
      this == TargetPlatform.iOS || this == TargetPlatform.android;

  bool get isDesktop =>
      this == TargetPlatform.linux ||
      this == TargetPlatform.macOS ||
      this == TargetPlatform.windows;
}

现在您可以使用。

内置context => context.isDesktop 目标平台=> defaulttarded平台

建议从上下文访问平台。

要检测您的应用程序是否在浏览器上运行，您可以轻松地使用基础库中的kIsWeb常量。

import 'package:flutter/foundation.dart';

  log('$kIsWeb'); // will print true if the app is running on a browser

注意，如果你在桌面上运行web应用程序，isDesktop getter将返回true，对于移动平台也是如此。 为了避免这种情况。

import 'package:flutter/foundation.dart';

  if (!kIsWeb && defaultTargetPlatform.isDesktop) {
    // do stuff for desktop apps only
  }

  if (!kIsWeb && defaultTargetPlatform.isMobile) {
    // do stuff for mobile apps only
  }

您可以修改扩展以获得您喜欢的实现。

import 'dart:io' show Platform;

if (Platform.isAndroid) {
  // Android-specific code
} else if (Platform.isIOS) {
  // iOS-specific code
}

所有选项包括:

Platform.isAndroid
Platform.isFuchsia
Platform.isIOS
Platform.isLinux
Platform.isMacOS
Platform.isWindows

你也可以使用kIsWeb来检测你是否在web上运行，kIsWeb是一个全局常量，指示应用程序是否被编译为在web上运行:

import 'package:flutter/foundation.dart' show kIsWeb;

if (kIsWeb) {
  // running on the web!
} else {
  // NOT running on the web! You can check for additional platforms here.
}

平台文档:https://api.flutter.dev/flutter/dart-io/Platform-class.html kIsWeb文档:https://api.flutter.dev/flutter/foundation/kIsWeb-constant.html

如果您只是需要一个字符串来记录日志，您可以使用Platform。operatingSystem，返回操作系统名称为小写字符串。

import 'dart:io';
import 'package:flutter/foundation.dart';

String _getPlatform() {
  if (kIsWeb) return 'web';
  return Platform.operatingSystem;
}