Flutter Linux硬件接口访问插件hid_linux的使用

在Linux系统上，访问硬件接口可以通过使用hid_linux插件来实现。hid_linux是 hid的Linux实现，允许开发者通过Flutter应用程序与支持HID（Human Interface Device）的硬件设备进行交互。

以下是一个完整的示例，展示如何在Flutter中使用 hid_linux 插件来访问硬件接口。

插件hid_linux的使用步骤

1. 添加依赖

首先，在 pubspec.yaml 文件中添加 hid_linux 依赖：

dependencies:
  hid_linux: ^0.1.0

然后运行以下命令以安装依赖：

flutter pub get

2. 编写代码

创建一个简单的Flutter应用程序，用于扫描和读取HID设备的信息。

完整示例代码

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

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

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

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

class _HidDeviceScannerState extends State<HidDeviceScanner> {
  List<String> devices = [];
  bool isLoading = true;

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

  Future<void> scanDevices() async {
    final hid = HidLinux(); // 创建HidLinux实例
    final deviceList = await hid.getDevices(); // 获取所有HID设备列表

    setState(() {
      devices = deviceList.map((device) => device.path).toList();
      isLoading = false;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('HID设备扫描'),
      ),
      body: isLoading
          ? Center(child: CircularProgressIndicator())
          : devices.isEmpty
              ? Center(child: Text('未找到HID设备'))
              : ListView.builder(
                  itemCount: devices.length,
                  itemBuilder: (context, index) {
                    return ListTile(
                      title: Text(devices[index]),
                      onTap: () {
                        Navigator.push(
                          context,
                          MaterialPageRoute(
                            builder: (context) => HidDeviceInfo(path: devices[index]),
                          ),
                        );
                      },
                    );
                  },
                ),
    );
  }
}

class HidDeviceInfo extends StatelessWidget {
  final String path;

  const HidDeviceInfo({required this.path});

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('设备信息'),
      ),
      body: FutureBuilder(
        future: HidLinux().openDevice(path),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return Center(child: CircularProgressIndicator());
          }

          final device = snapshot.data as HidLinuxDevice;
          return Padding(
            padding: const EdgeInsets.all(16.0),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text('设备路径: ${device.path}'),
                SizedBox(height: 8),
                Text('厂商ID: ${device.vendorId}'),
                SizedBox(height: 8),
                Text('产品ID: ${device.productId}'),
                SizedBox(height: 8),
                Text('序列号: ${device.serialNumber ?? '无'}'),
                SizedBox(height: 8),
                ElevatedButton(
                  onPressed: () {
                    device.read().then((data) {
                      showDialog(
                        context: context,
                        builder: (context) => AlertDialog(
                          title: Text('读取数据'),
                          content: Text(data.toString()),
                        ),
                      );
                    }).catchError((error) {
                      showDialog(
                        context: context,
                        builder: (context) => AlertDialog(
                          title: Text('错误'),
                          content: Text(error.toString()),
                        ),
                      );
                    });
                  },
                  child: Text('读取数据'),
                ),
              ],
            ),
          );
        },
      ),
    );
  }
}