Flutter低功耗蓝牙插件bluetooth_low_energy_windows的使用

当然，以下是一个关于如何在Flutter项目中使用bluetooth_low_energy_windows插件来与低功耗蓝牙设备进行交互的代码示例。这个示例将展示如何初始化蓝牙适配器、扫描设备以及连接到设备并读取服务、特征和值。

首先，确保你已经在pubspec.yaml文件中添加了bluetooth_low_energy_windows依赖：

dependencies:
  flutter:
    sdk: flutter
  bluetooth_low_energy_windows: ^x.y.z  # 替换为最新版本号

然后，运行flutter pub get来安装依赖。

接下来，在你的Flutter项目中，你可以创建一个新的Dart文件来处理蓝牙操作，例如bluetooth_service.dart：

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

class BluetoothService {
  late BluetoothAdapter adapter;
  late BluetoothManager manager;

  BluetoothService() {
    BluetoothManager.instance.then((value) {
      manager = value;
      adapter = manager.defaultAdapter;
      initBluetooth();
    });
  }

  Future<void> initBluetooth() async {
    if (!adapter.isPoweredOn) {
      await adapter.requestEnable();
    }
  }

  Future<List<BluetoothDevice>> scanDevices() async {
    List<BluetoothDevice> devices = [];
    try {
      adapter.startDiscovery(null).listen((device) {
        devices.add(device);
        print("Found device: ${device.name}, Address: ${device.address}");
      }, onError: (error) {
        print("Scan error: $error");
      }, onDone: () {
        print("Scan done");
      });

      // 这里我们简单地等待5秒来模拟扫描过程，然后停止扫描
      await Future.delayed(Duration(seconds: 5));
      adapter.stopDiscovery();
    } catch (e) {
      print("Error scanning for devices: $e");
    }
    return devices;
  }

  Future<BluetoothRemoteDevice?> connectToDevice(String deviceAddress) async {
    BluetoothRemoteDevice? device = await adapter.getRemoteDevice(deviceAddress);
    if (device != null && !device.isConnected) {
      await device.connect();
      print("Connected to device: ${device.name}, Address: ${device.address}");
    }
    return device;
  }

  Future<void> discoverServices(BluetoothRemoteDevice device) async {
    try {
      List<BluetoothService> services = await device.discoverServices();
      services.forEach((service) {
        print("Service UUID: ${service.uuid}");
        service.characteristics.forEach((characteristic) {
          print("  Characteristic UUID: ${characteristic.uuid}");
          characteristic.readValue().then((value) {
            print("    Value: ${value}");
          });
        });
      });
    } catch (e) {
      print("Error discovering services: $e");
    }
  }
}

然后，在你的主Dart文件（例如main.dart）中，你可以使用BluetoothService类来初始化蓝牙并进行设备扫描和连接等操作：

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: BluetoothScreen(),
    );
  }
}

class BluetoothScreen extends StatefulWidget {
  @override
  _BluetoothScreenState createState() => _BluetoothScreenState();
}

class _BluetoothScreenState extends State<BluetoothScreen> {
  late BluetoothService bluetoothService;
  List<String> deviceAddresses = [];

  @override
  void initState() {
    super.initState();
    bluetoothService = BluetoothService();
    scanForDevices();
  }

  Future<void> scanForDevices() async {
    List<BluetoothDevice> devices = await bluetoothService.scanDevices();
    setState(() {
      deviceAddresses = devices.map((device) => device.address).toList();
    });
  }

  Future<void> connectToDevice(String address) async {
    BluetoothRemoteDevice? device = await bluetoothService.connectToDevice(address);
    if (device != null) {
      bluetoothService.discoverServices(device);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Bluetooth Demo'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          children: [
            Text('Scanned Devices:'),
            ...deviceAddresses.map((address) => ElevatedButton(
              onPressed: () => connectToDevice(address),
              child: Text("Connect to $address"),
            )).toList(),
          ],
        ),
      ),
    );
  }
}

这个示例代码展示了如何初始化蓝牙适配器、扫描设备、连接到设备以及发现服务和特征。请注意，这只是一个基本的示例，实际应用中可能需要处理更多的错误情况和边界情况。此外，bluetooth_low_energy_windows插件的API可能会随着版本的更新而变化，因此请参考最新的插件文档以获取最新的API信息和最佳实践。