flutter_proxy_detector 1.0.0

A Flutter plugin to detect system proxy settings (HTTP/HTTPS) and enforce them on native network stacks. Supports Android, iOS, macOS, Windows, and Linux.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'dart:async';

import 'package:flutter/services.dart';
import 'package:flutter_proxy_detector/flutter_proxy_detector.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  String _proxySetting = 'Unknown';
  final _flutterProxyDetectorPlugin = FlutterProxyDetector();

  @override
  void initState() {
    super.initState();
    initPlatformState();
    _getProxySetting();
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    String platformVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    // We also handle the message potentially returning null.
    try {
      platformVersion =
          await _flutterProxyDetectorPlugin.getPlatformVersion() ??
          'Unknown platform version';
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion;
    });
  }

  Future<void> _getProxySetting() async {
    String proxySetting;
    try {
      proxySetting =
          await _flutterProxyDetectorPlugin.getProxySetting() ??
          'No proxy detected';
    } on PlatformException {
      proxySetting = 'Failed to get proxy setting.';
    }

    if (!mounted) return;

    setState(() {
      _proxySetting = proxySetting;
    });
  }

  Future<void> _applySystemProxy() async {
    try {
      await _flutterProxyDetectorPlugin.applySystemProxyIfAvailable();
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Applied system proxy if available')),
      );
      await _getProxySetting(); // Refresh setting display
    } on PlatformException catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Failed to apply proxy: ${e.message}')),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('Proxy Detection Demo')),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text('Running on: $_platformVersion\n'),
              Text('Proxy Setting: $_proxySetting\n'),
              ElevatedButton(
                onPressed: _getProxySetting,
                child: const Text('Refresh Proxy Setting'),
              ),
              const SizedBox(height: 16),
              ElevatedButton(
                onPressed: _applySystemProxy,
                child: const Text('Apply System Proxy'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}