flutter_usb_plus 0.0.1

Flutter plugin use USB ON Android

example/lib/main.dart

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

import 'package:flutter/services.dart';
import 'package:flutter_usb_plus/flutter_usb_plus.dart';
import 'package:flutter_usb_plus/flutter_usb_plus_platform_interface.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:convert/convert.dart';
import 'package:usb_serial/usb_serial.dart';

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

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  final _flutterUsbPlusPlugin = FlutterUsbPlus();

  @override
  void initState() {
    super.initState();
    // initPlatformState();
    UsbSerial.usbEventStream!.listen((UsbEvent event) {
      _getPorts();
    });

    _getPorts();
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    String platformVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    // We also handle the message potentially returning null.
    try {
      platformVersion = await _flutterUsbPlusPlugin.getPlatformVersion() ??
          'Unknown platform version';
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Center(
            child: Column(
          children: [

            InkWell(
              onTap: ()async {

                print("获取权限");
                // if (await Permission..request().isGranted) {
                // _flutterUsbPlusPlugin.requestUsbPermission();
                // FlutterUsbPlusPlatform.registerNativeCallback();
                // }
              },
              child: Text("获取权限"),
            ),
            Padding(padding: EdgeInsets.only(top: 30)),

            InkWell(
              onTap: ()async {

                print("点击事件");
                // if (await Permission..request().isGranted) {
                _flutterUsbPlusPlugin.openUsbConnection(1, 115200, 8, 1, 0);

                // }
              },
              child: Text("打开usb"),
            ),
            
            Padding(padding: EdgeInsets.only(top: 30)),
            InkWell(
              onTap: ()async {

                print("点击事件");
                // if (await Permission..request().isGranted) {
                _flutterUsbPlusPlugin.requestUSBPermissionWithConnection(1, 115200, 8, 1, 0);

                // }
              },
              child: Text("获取权限并打开USB"),
            ),

            Padding(padding: EdgeInsets.only(top: 30)),
            InkWell(
              onTap: ()async {

                print("数据发送");
                // if (await Permission..request().isGranted) {
                // _flutterUsbPlusPlugin.openUsbConnection(1, 115200, 8, 1, 0);

                 _flutterUsbPlusPlugin.sendDataToUsb(hex.decode("680f004100005f000002030100a616"));
                // }
              },
              child: Text("数据发送"),
            ),

            Padding(padding: EdgeInsets.only(top: 30)),
            
            Text('Running on: $_platformVersion\n'),
          ],
        )),
      ),
    );
  }

  void _getPorts() async {

    List<UsbDevice> devices = await UsbSerial.listDevices();


    print("输出设备数量:"+ devices.length.toString());


  }

}