Flutter扫码识别插件scanning_gun的使用

Scanner_Gun

这是一个非官方的Flutter插件，用于将Flutter代码与Hopeland公司的扫描枪（Scanning Gun）连接起来。

特性

• 可以通过点击屏幕上的按钮来扫描二维码或条形码。
• 也可以通过点击扫描枪上的按钮来触发扫描操作。

简单使用

1. 首先声明类并实例化。

ScannerGun scannerGun = ScannerGun();

1. 初始化扫描枪。
   在initState方法中调用initialize()方法。

[@override](/user/override)
void initState(){
  super.initState();
  setState(() {
    scannerGun.initialize();
  });
}

1. 调用扫描功能以获取扫描枪的响应。

scannerGun.scan().then((value){
  print("Here is the Scanner Response $value");
});

使用步骤

1. 示例测试设备为Hopeland HY820
   

2. 运行示例程序并点击“Scan”按钮
   

3. 几秒钟后即可获得扫描结果
   

安装

添加依赖项到项目中：

flutter pub add scanning_gun

该库完全由Dart编写，仍在开发中。希望它能像帮助我一样帮助到你！以下是示例代码的链接：GitHub - 项目示例。

示例代码

以下是完整的示例代码，展示了如何使用scanning_gun插件：

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:scanning_gun/scanning_gun.dart';

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

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  [@override](/user/override)
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return const MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scanner(),
    );
  }
}

class Scanner extends StatefulWidget {
  const Scanner({Key? key}) : super(key: key);

  [@override](/user/override)
  _ScannerState createState() => _ScannerState();
}

class _ScannerState extends State<Scanner> {
  ScanningGun scannerGun = ScanningGun();
  FocusNode focusNode = FocusNode();

  // 存储扫描结果
  String scannerResponse = "";

  [@override](/user/override)
  void initState() {
    super.initState();
    setState(() {
      scannerGun.initialize(); // 初始化扫描枪
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    FocusScope.of(context).requestFocus(focusNode);

    return Scaffold(
      body: RawKeyboardListener(
        autofocus: true,
        focusNode: focusNode, // 设置焦点以便捕获键盘事件
        onKey: (RawKeyEvent event) {
          // 检测扫描枪上的 F10 按钮
          if (event.data.logicalKey == LogicalKeyboardKey.f10) {
            scannerGun.scan().then((value) {
              // 显示扫描结果
              showDialog(
                context: context,
                builder: (context) {
                  return AlertDialog(
                    content: Column(
                      crossAxisAlignment: CrossAxisAlignment.center,
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: [
                        Text(
                          "Scanner Gun Response".toUpperCase(),
                          style: const TextStyle(
                            fontWeight: FontWeight.bold,
                            fontSize: 18,
                          ),
                        ),
                        Text(
                          value,
                          style: const TextStyle(
                            fontWeight: FontWeight.bold,
                            fontSize: 18,
                          ),
                        ),
                      ],
                    ),
                  );
                },
              );
            });
          }
        },
        child: SizedBox(
          width: MediaQuery.of(context).size.width,
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.center,
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text(
                "Scanner Gun Example".toUpperCase(),
                style: const TextStyle(
                  fontWeight: FontWeight.bold,
                  fontSize: 18,
                ),
              ),
              TextButton(
                onPressed: () {
                  // 点击屏幕上的按钮进行扫描
                  scannerGun.scan().then((value) {
                    showDialog(
                      context: context,
                      builder: (context) {
                        return AlertDialog(
                          content: Column(
                            crossAxisAlignment: CrossAxisAlignment.center,
                            mainAxisAlignment: MainAxisAlignment.center,
                            children: [
                              Text(
                                "Scanner Gun Response".toUpperCase(),
                                style: const TextStyle(
                                  fontWeight: FontWeight.bold,
                                  fontSize: 18,
                                ),
                              ),
                              Text(
                                value,
                                style: const TextStyle(
                                  fontWeight: FontWeight.bold,
                                  fontSize: 18,
                                ),
                              ),
                            ],
                          ),
                        );
                      },
                    );
                  });
                },
                child: const Text("Scan"),
              )
            ],
          ),
        ),
      ),
    );
  }
}