Flutter未知功能插件uhf_c72_plugin的使用(注:由于介绍为undefined,以下基于插件名称进行合理推测)

发布于 1周前 作者 wuwangju 来自 Flutter

Flutter未知功能插件uhf_c72_plugin的使用

描述

uhf_c72_plugin 是一个用于与UHF类型C72读卡器交互以读取UHF卡数据的Flutter插件。

库链接

https://pub.dev/packages/uhf_plugin

快速开始

1. 导入库

import 'package:uhf_c72_plugin/uhf_c72_plugin.dart';

2. 打开连接到UHF读卡器

await UhfPlugin.connect;

3. 检查读卡器是否已连接

bool isConnected = await UhfPlugin.isConnected;

4. 开始读取单个UHF卡的数据

await UhfPlugin.startSingle;

5. 开始连续读取多个UHF卡的数据

await UhfPlugin.startContinuous;

6. 检查是否已经开始读取

bool isStarted = await UhfPlugin.isStarted;

7. 停止读取

await UhfPlugin.stop;

8. 关闭连接

await UhfPlugin.close;

9. 清除读卡器缓存数据

await UhfPlugin.clearData;

10. 检查标签是否为空

bool isEmptyTags = await UhfPlugin.isEmptyTags;

11. 设置功率等级(范围:5 dBm 至 30 dBm)

await UhfPlugin.setPowerLevel('26'); // 使用字符串表示的数字

12. 设置工作区域

await UhfPlugin.setWorkArea('1'); // 区域值可以是 "1", "2", "4", "8", "22", "50", "51", "52", "128"

13. 监听标签状态

UhfPlugin.tagsStatusStream.receiveBroadcastStream().listen((result) {
  setState(() {
    _data = TagEpc.parseTags(result);
  });
});

示例代码

下面是一个完整的示例代码,展示了如何在Flutter应用中使用uhf_c72_plugin插件:

import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter/services.dart';
import 'package:uhf_c72_plugin/uhf_c72_plugin.dart';
import 'package:uhf_c72_plugin/tag_epc.dart';

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  bool _isStarted = false;
  bool _isEmptyTags = false;
  bool _isConnected = false;
  TextEditingController powerLevelController = TextEditingController(text: '26');
  TextEditingController workAreaController = TextEditingController(text: '1');

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

  Future<void> initPlatformState() async {
    String? platformVersion;

    try {
      platformVersion = await UhfC72Plugin.platformVersion;
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    UhfC72Plugin.connectedStatusStream.receiveBroadcastStream().listen(updateIsConnected);
    UhfC72Plugin.tagsStatusStream.receiveBroadcastStream().listen(updateTags);

    await UhfC72Plugin.connect;
    await UhfC72Plugin.setWorkArea('2');
    await UhfC72Plugin.setPowerLevel('30');

    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion!;
    });
  }

  List<String> _logs = [];
  void log(String msg) {
    setState(() {
      _logs.add(msg);
    });
  }

  List<TagEpc> _data = [];

  void updateTags(dynamic result) {
    log('update tags');
    setState(() {
      _data = TagEpc.parseTags(result);
    });
  }

  void updateIsConnected(dynamic isConnected) {
    log('connected $isConnected');
    _isConnected = isConnected;
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('UHF PROGAZE'),
        ),
        body: SingleChildScrollView(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.start,
            children: <Widget>[
              Card(
                child: Padding(
                  padding: const EdgeInsets.all(3.0),
                  child: Image.asset(
                    'assets/logo.png',
                    width: double.infinity,
                    height: 80,
                    fit: BoxFit.contain,
                  ),
                ),
              ),
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                children: <Widget>[
                  MaterialButton(
                    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(18.0)),
                    color: Colors.blueAccent,
                    child: Text('Call Start Single', style: TextStyle(color: Colors.white)),
                    onPressed: () async {
                      bool? isStarted = await UhfC72Plugin.startSingle;
                      log('Start single $isStarted');
                    },
                  ),
                  MaterialButton(
                    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(18.0)),
                    color: Colors.blueAccent,
                    child: Text('Call Start Continuous Reading', style: TextStyle(color: Colors.white)),
                    onPressed: () async {
                      bool? isStarted = await UhfC72Plugin.startContinuous;
                      log('Start Continuous $isStarted');
                    },
                  ),
                ],
              ),
              MaterialButton(
                shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(18.0)),
                color: Colors.blueAccent,
                child: Text('Call Stop', style: TextStyle(color: Colors.white)),
                onPressed: () async {
                  bool? isStopped = await UhfC72Plugin.stop;
                  log('Stop $isStopped');
                },
              ),
              MaterialButton(
                shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(18.0)),
                color: Colors.blueAccent,
                child: Text('Call Clear Data', style: TextStyle(color: Colors.white)),
                onPressed: () async {
                  await UhfC72Plugin.clearData;
                  setState(() {
                    _data = [];
                  });
                },
              ),
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                children: <Widget>[
                  Container(
                    width: 100,
                    child: TextFormField(
                      controller: powerLevelController,
                      keyboardType: TextInputType.number,
                      textAlign: TextAlign.center,
                      decoration: InputDecoration(labelText: 'Power Level'),
                    ),
                  ),
                  MaterialButton(
                    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(18.0)),
                    color: Colors.green,
                    child: Text('Set Power Level', style: TextStyle(color: Colors.white)),
                    onPressed: () async {
                      bool? isSetPower = await UhfC72Plugin.setPowerLevel(powerLevelController.text);
                      log('isSetPower $isSetPower');
                    },
                  ),
                ],
              ),
              Text(
                'powers {"5" : "30" dBm}',
                style: TextStyle(color: Colors.blue.shade800, fontSize: 12),
              ),
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                children: <Widget>[
                  Container(
                    width: 100,
                    child: TextFormField(
                      controller: workAreaController,
                      keyboardType: TextInputType.number,
                      textAlign: TextAlign.center,
                      decoration: InputDecoration(labelText: 'Work Area'),
                    ),
                  ),
                  MaterialButton(
                    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(18.0)),
                    color: Colors.green,
                    child: Text('Set Work Area', style: TextStyle(color: Colors.white)),
                    onPressed: () async {
                      bool? isSetWorkArea = await UhfC72Plugin.setWorkArea(workAreaController.text);
                      log('isSetWorkArea $isSetWorkArea');
                    },
                  ),
                ],
              ),
              Text(
                'Work Area 1 China 920MHz - 2 China 840 - 3 ETSI 865\n4 Fixed 915 - 5 USA 902',
                style: TextStyle(color: Colors.blue.shade800, fontSize: 12),
              ),
              Container(
                width: double.infinity,
                height: 2,
                margin: EdgeInsets.symmetric(vertical: 8),
                color: Colors.blueAccent,
              ),
              ..._logs.map((String msg) => Card(
                    color: Colors.blue.shade50,
                    child: Container(
                      width: 330,
                      alignment: Alignment.center,
                      padding: const EdgeInsets.all(8.0),
                      child: Text(
                        'Log: $msg',
                        style: TextStyle(color: Colors.blue.shade800),
                      ),
                    ),
                  )),
              ..._data.map((TagEpc tag) => Card(
                    color: Colors.blue.shade50,
                    child: Container(
                      width: 330,
                      alignment: Alignment.center,
                      padding: const EdgeInsets.all(8.0),
                      child: Text(
                        'Tag ${tag.epc} Count:${tag.count}',
                        style: TextStyle(color: Colors.blue.shade800),
                      ),
                    ),
                  )),
            ],
          ),
        ),
      ),
    );
  }
}

此代码创建了一个简单的Flutter应用程序,允许用户与UHF C72读卡器进行交互。通过按钮控制读卡器的各种操作,并显示日志和读取到的标签信息。


更多关于Flutter未知功能插件uhf_c72_plugin的使用(注:由于介绍为undefined,以下基于插件名称进行合理推测)的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html

1 回复

更多关于Flutter未知功能插件uhf_c72_plugin的使用(注:由于介绍为undefined,以下基于插件名称进行合理推测)的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html


在Flutter中,对于未知或文档不完整的插件,通常需要通过查看插件的源代码或尝试逆向工程来理解其用法。不过,由于我们不能直接访问实际的插件代码(假设uhf_c72_plugin是一个真实存在的插件,但文档缺失),我将基于插件名称和一些常见的Flutter插件开发模式,提供一个假设性的使用案例。

假设性使用案例

假设uhf_c72_plugin是一个与硬件通信或提供特定服务的插件,可能涉及到一些初始化、配置和数据获取的操作。以下是一个基于这种假设的Flutter代码示例:

1. 添加依赖

首先,你需要在pubspec.yaml文件中添加对该插件的依赖(注意:这里的版本号^x.x.x需要根据实际情况填写):

dependencies:
  flutter:
    sdk: flutter
  uhf_c72_plugin: ^x.x.x

然后运行flutter pub get来安装依赖。

2. 导入插件

在你的Dart文件中导入插件:

import 'package:uhf_c72_plugin/uhf_c72_plugin.dart';

3. 初始化插件

假设插件需要初始化,可能有一个init方法:

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  
  // 初始化插件
  UhfC72Plugin uhfPlugin = UhfC72Plugin();
  await uhfPlugin.init();

  runApp(MyApp());
}

4. 使用插件功能

假设插件提供了配置和数据获取的方法,我们可以这样使用:

import 'package:flutter/material.dart';
import 'package:uhf_c72_plugin/uhf_c72_plugin.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  
  UhfC72Plugin uhfPlugin = UhfC72Plugin();
  await uhfPlugin.init();

  runApp(MyApp(uhfPlugin: uhfPlugin));
}

class MyApp extends StatelessWidget {
  final UhfC72Plugin uhfPlugin;

  MyApp({required this.uhfPlugin});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('UHF C72 Plugin Demo'),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              ElevatedButton(
                onPressed: () async {
                  // 配置插件(假设有一个setConfig方法)
                  Map<String, dynamic> config = {
                    'frequency': 915.0,
                    'power': 25.0,
                  };
                  await uhfPlugin.setConfig(config);

                  // 获取数据(假设有一个getData方法)
                  dynamic data = await uhfPlugin.getData();
                  print('Received data: $data');
                },
                child: Text('Configure and Get Data'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

5. 错误处理

在实际应用中,处理错误是很重要的。假设插件的方法可能抛出异常,我们应该添加错误处理逻辑:

ElevatedButton(
  onPressed: () async {
    try {
      Map<String, dynamic> config = {
        'frequency': 915.0,
        'power': 25.0,
      };
      await uhfPlugin.setConfig(config);

      dynamic data = await uhfPlugin.getData();
      print('Received data: $data');
    } catch (e) {
      print('Error: $e');
      // 显示错误消息给用户
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Failed to configure or get data: $e')),
      );
    }
  },
  child: Text('Configure and Get Data'),
),

注意

  • 上述代码是基于假设的,实际插件的使用可能会有所不同。
  • 在没有文档的情况下,查看插件的源代码或联系插件的维护者是了解插件正确用法的最佳途径。
  • 插件方法名和参数需要根据实际情况调整。

希望这个假设性的使用案例能为你提供一些方向!

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