Flutter设备扫描与连接插件konnectedscan的使用

konnectedscan 是一个用于在 Flutter 中扫描和连接设备的插件。它可以帮助你扫描附近的设备，并建立连接。以下是如何使用 konnectedscan 插件的基本步骤：

1. 添加依赖

首先，你需要在 pubspec.yaml 文件中添加 konnectedscan 插件的依赖：

dependencies:
  flutter:
    sdk: flutter
  konnectedscan: ^1.0.0  # 请使用最新版本

然后，运行 flutter pub get 来安装依赖。

2. 导入插件

在你的 Dart 文件中导入 konnectedscan 插件：

import 'package:konnectedscan/konnectedscan.dart';

3. 初始化插件

在使用插件之前，你需要初始化它：

KonnectedScan konnectedScan = KonnectedScan();

4. 扫描设备

使用 startScan 方法来开始扫描附近的设备。你可以指定一个超时时间（以秒为单位）：

void scanDevices() async {
  try {
    List<ScannedDevice> devices = await konnectedScan.startScan(timeout: 10);
    for (var device in devices) {
      print('Device Name: ${device.name}, Address: ${device.address}');
    }
  } catch (e) {
    print('Error scanning devices: $e');
  }
}

5. 连接设备

使用 connect 方法来连接到一个设备。你需要提供设备的地址：

void connectToDevice(String address) async {
  try {
    bool isConnected = await konnectedScan.connect(address);
    if (isConnected) {
      print('Connected to device');
    } else {
      print('Failed to connect to device');
    }
  } catch (e) {
    print('Error connecting to device: $e');
  }
}

6. 断开连接

使用 disconnect 方法来断开与设备的连接：

void disconnectDevice() async {
  try {
    await konnectedScan.disconnect();
    print('Disconnected from device');
  } catch (e) {
    print('Error disconnecting from device: $e');
  }
}

7. 处理连接状态

你可以监听设备的连接状态变化：

void listenToConnectionState() {
  konnectedScan.connectionStateStream.listen((state) {
    print('Connection state: $state');
  });
}

8. 释放资源

在不再需要插件时，记得释放资源：

void dispose() {
  konnectedScan.dispose();
}

完整示例

以下是一个完整的示例，展示了如何使用 konnectedscan 插件来扫描和连接设备：

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

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

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: DeviceScanScreen(),
    );
  }
}

class DeviceScanScreen extends StatefulWidget {
  [@override](/user/override)
  _DeviceScanScreenState createState() => _DeviceScanScreenState();
}

class _DeviceScanScreenState extends State<DeviceScanScreen> {
  KonnectedScan konnectedScan = KonnectedScan();
  List<ScannedDevice> devices = [];

  [@override](/user/override)
  void initState() {
    super.initState();
    listenToConnectionState();
  }

  void scanDevices() async {
    try {
      List<ScannedDevice> scannedDevices = await konnectedScan.startScan(timeout: 10);
      setState(() {
        devices = scannedDevices;
      });
    } catch (e) {
      print('Error scanning devices: $e');
    }
  }

  void connectToDevice(String address) async {
    try {
      bool isConnected = await konnectedScan.connect(address);
      if (isConnected) {
        print('Connected to device');
      } else {
        print('Failed to connect to device');
      }
    } catch (e) {
      print('Error connecting to device: $e');
    }
  }

  void listenToConnectionState() {
    konnectedScan.connectionStateStream.listen((state) {
      print('Connection state: $state');
    });
  }

  [@override](/user/override)
  void dispose() {
    konnectedScan.dispose();
    super.dispose();
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Device Scanner'),
      ),
      body: ListView.builder(
        itemCount: devices.length,
        itemBuilder: (context, index) {
          return ListTile(
            title: Text(devices[index].name),
            subtitle: Text(devices[index].address),
            onTap: () => connectToDevice(devices[index].address),
          );
        },
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: scanDevices,
        child: Icon(Icons.search),
      ),
    );
  }
}