Flutter-发现局域网中的设备

前言
现在有一个需求：要能够获取到局域网中的遮阳帘设备。通过搜索发现flutter_mdns_plugin可以满足这个需求

Pub：flutter_mdns_plugin | Flutter package

GitHub：https://github.com/terrabythia/flutter_mdns_plugin

MDNS服务类型
要根据不同的MDNS服务类型来发现对应的设备

服务类型参考：mDNS的服务类型

全部代码
import 'package:flutter/material.dart';
import 'package:flutter_mdns_plugin/flutter_mdns_plugin.dart';

class MyApp1 extends StatefulWidget {
const MyApp1({super.key});

@override
State createState() => _MyApp1State();
}

class _MyApp1State extends State {
List devices = [];
bool isScanning = false;
List messageLog = [];

//设备扫描函数

Future scanDevices() async {
setState(() {
isScanning = true;
devices.clear();
});

const String serviceType = '_http._tcp';
DiscoveryCallbacks discoveryCallbacks = DiscoveryCallbacks(
  onDiscovered: (ServiceInfo info) {
    print("Discovered ${info.toString()}");
  },
  onDiscoveryStarted: () {
    print("Discovery started");
  },
  onDiscoveryStopped: () {
    print("Discovery stopped");
  },
  onResolved: (ServiceInfo info) {
    print("Resolved Service ${info.toString()}");
    setState(() {
      devices.add(info.toString());
    });
  },
);

final mdnsPlugin =  FlutterMdnsPlugin(discoveryCallbacks: discoveryCallbacks);

try {
  await mdnsPlugin.startDiscovery(serviceType);

  await Future.delayed(const Duration(seconds: 1)); // 扫描5秒钟

  await mdnsPlugin.stopDiscovery();
} catch (e) {
  print('Error during device scan: $e');
}

setState(() {
  isScanning = false;
});

}

@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Device Scanner'),
),
body: Column(
children: [
ElevatedButton(
onPressed: isScanning ? null : scanDevices,
child: const Text('Scan Devices'),
),
const SizedBox(height: 16),
if (isScanning)
const CircularProgressIndicator()
else if (devices.isEmpty)
Text('No devices found.')
else
Expanded(
child: ListView.builder(
itemCount: devices.length,
itemBuilder: (context, index) {
return ListTile(
title: Text(devices[index]),
);
},
),
),
],
),
);
}
}