Flutter USB设备管理插件flutter_usb_device_manage的使用
Flutter USB设备管理插件flutter_usb_device_manage的使用
主要用于项目中USB设备的集中授权及硬件功能实现，目前包含了USB指纹模块和RFID通讯模块。
USB指纹模块
USB指纹模块主要功能是指纹的注册登记上报和采集匹配模版上报。
openDevice（打开设备）
打开指纹模块的通讯端口。
_flutterUsbFingerprintManagePlugin.openDevice();
closeDevice（关闭设备）
关闭指纹模块的通讯端口。
_flutterUsbFingerprintManagePlugin.closeDevice();
registration（指纹登记）
通讯端口打开后调用该方法进行指纹的登记，包含登记次数参数（enrolCount），登记成功后会通过异步消息返回指纹特征的Base64字符串。
_flutterUsbFingerprintManagePlugin.registration(3);
collecting（指纹采集）
通讯端口打开后调用该方法进行指纹采集，采集成功后会通过异步消息返回指纹特征的Base64字符串，可用于服务端比对。
_flutterUsbFingerprintManagePlugin.collecting();
RFID通讯模块
openAndroidUsbSerial（打开USB串口）
打开RFID模块的USB转串口通讯。
_flutterUsbRFIDManagePlugin.openUsbSerial();
closeAndroidUsbSerial（关闭USB串口）
关闭RFID模块的USB转串口通讯。
_flutterUsbRFIDManagePlugin.closeUsbSerial();
startRead（开始读取）
打开通讯后可通过调用该方法进行RFID标签的读取上报，参数包含模式（mode）、超时时间（timeout），标签上报通过异步消息上报。
_flutterUsbRFIDManagePlugin.startRead(1, 500000);
stopRead（停止读取）
打开通讯后可通过调用该方法停止RFID标签的读取上报。
_flutterUsbRFIDManagePlugin.stopRead();
完整示例代码
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter_usb_device_manage/flutter_usb_device_manage.dart';
import 'package:flutter_usb_device_manage/flutter_usb_fingerprint_manage.dart';
import 'package:flutter_usb_device_manage/flutter_usb_rfid_manage.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({super.key});
[@override](/user/override)
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
String _message = 'Unknown';
final _flutterUsbDeviceManagePlugin = FlutterUsbDeviceManage();
final _flutterUsbFingerprintManagePlugin = FlutterUsbFingerprintManage();
final _flutterUsbRFIDManagePlugin = FlutterUsbRFIDManage();
[@override](/user/override)
void initState() {
super.initState();
initListenMessage();
}
// 平台消息是异步的，所以我们初始化在一个异步方法中。
Future<void> initListenMessage() async {
_flutterUsbDeviceManagePlugin.listenerEvent(
(message) => {
setState(() {
_message = message;
})
},
// 忽略：避免打印
(error) => {print("$error")});
}
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('串口设备调试程序'),
),
body: Column(
children: [
TextField(
style: const TextStyle(color: Color(0xFFA7ABBB), fontSize: 15),
controller: TextEditingController.fromValue(
TextEditingValue(text: _message)),
decoration: InputDecoration(
counterText: '',
hintMaxLines: 10,
filled: true,
hintStyle: const TextStyle(
color: Color.fromARGB(255, 5, 5, 6), fontSize: 15),
hintText: '消息内容',
contentPadding:
const EdgeInsets.symmetric(horizontal: 15, vertical: 10),
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(6),
borderSide: BorderSide.none),
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(6),
borderSide: BorderSide.none),
)),
Row(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
MaterialButton(
color: Colors.blue,
textColor: Colors.white,
child: const Text('USB设备授权'),
onPressed: () {
_flutterUsbDeviceManagePlugin.requestPermission();
}),
],
),
Row(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
MaterialButton(
color: Colors.blue,
textColor: Colors.white,
child: const Text('打开指纹模块'),
onPressed: () {
_flutterUsbFingerprintManagePlugin.openDevice();
}),
MaterialButton(
color: Colors.blue,
textColor: Colors.white,
child: const Text('登记指纹'),
onPressed: () {
_flutterUsbFingerprintManagePlugin.registration(3);
}),
MaterialButton(
color: Colors.blue,
textColor: Colors.white,
child: const Text('采集指纹'),
onPressed: () {
_flutterUsbFingerprintManagePlugin.collecting();
}),
MaterialButton(
color: Colors.blue,
textColor: Colors.white,
child: const Text('关闭指纹模块'),
onPressed: () {
_flutterUsbFingerprintManagePlugin.closeDevice();
}),
],
),
Row(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
MaterialButton(
color: Colors.blue,
textColor: Colors.white,
child: const Text('打开RFID模块通讯'),
onPressed: () {
_flutterUsbRFIDManagePlugin.openUsbSerial();
}),
MaterialButton(
color: Colors.blue,
textColor: Colors.white,
child: const Text('开始读取'),
onPressed: () {
_flutterUsbRFIDManagePlugin.startRead(1, 500000);
}),
MaterialButton(
color: Colors.blue,
textColor: Colors.white,
child: const Text('停止读取'),
onPressed: () {
_flutterUsbRFIDManagePlugin.stopRead();
}),
MaterialButton(
color: Colors.blue,
textColor: Colors.white,
child: const Text('关闭RFID模块通信'),
onPressed: () {
_flutterUsbRFIDManagePlugin.closeUsbSerial();
}),
],
)
],
),
),
);
}
}
更多关于Flutter USB设备管理插件flutter_usb_device_manage的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html
