Flutter 蓝牙智能硬件操作示例

以下是一个简单的Flutter蓝牙智能硬件操作示例，使用flutter_blue插件：

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

void main() => runApp(MyApp());

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

class BluetoothPage extends StatefulWidget {
  @override
  _BluetoothPageState createState() => _BluetoothPageState();
}

class _BluetoothPageState extends State<BluetoothPage> {
  FlutterBlue flutterBlue = FlutterBlue.instance;
  List<ScanResult> scanResults = [];

  @override
  void initState() {
    super.initState();
    startScan();
  }

  void startScan() async {
    flutterBlue.startScan(timeout: Duration(seconds: 4));
    flutterBlue.scanResults.listen((results) {
      setState(() {
        scanResults = results;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('蓝牙设备扫描')),
      body: ListView.builder(
        itemCount: scanResults.length,
        itemBuilder: (context, index) {
          var device = scanResults[index].device;
          return ListTile(
            title: Text(device.name.isEmpty ? '未知设备' : device.name),
            subtitle: Text(device.id.toString()),
            onTap: () {
              Navigator.push(
                context,
                MaterialPageRoute(
                  builder: (_) => DevicePage(device: device),
                ),
              );
            },
          );
        },
      ),
    );
  }
}

class DevicePage extends StatefulWidget {
  final BluetoothDevice device;

  DevicePage({required this.device});

  @override
  _DevicePageState createState() => _DevicePageState();
}

class _DevicePageState extends State<DevicePage> {
  BluetoothDevice? device;
  BluetoothConnection? connection;

  @override
  void initState() {
    super.initState();
    connectToDevice();
  }

  Future<void> connectToDevice() async {
    connection = await BluetoothConnection.toAddress(widget.device.id.toString());
    setState(() {
      device = widget.device;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('${device?.name}')),
      body: Center(
        child: ElevatedButton(
          onPressed: () {
            if (connection != null && connection!.isConnected) {
              connection!.input?.listen(null).onDone(() {
                print('Device disconnected');
              });
            }
          },
          child: Text('连接'),
        ),
      ),
    );
  }
}

此代码实现了蓝牙设备的扫描和连接功能。注意需添加flutter_blue依赖并在Android和iOS中进行相关权限配置。