Flutter二维码扫描插件flash_scan_plugin的使用

Android手机支持扫描头监听

开始使用

方式一：Widget 继承 FlashScanMixin

import 'package:flutter/material.dart';
import 'package:flash_scan_plugin/flash_scan_mixin.dart';

/// * 创建者：yulongmei.
/// * 日期：2024/2/1.

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

  [@override](/user/override)
  State<ScanPage> createState() => _ScanPageState();
}

class _ScanPageState extends State<ScanPage> with FlashScanMixin {
  String _code = '';

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('扫描'),
      ),
      body: Center(
        child: Text('扫描码: $_code'),
      ),
    );
  }

  [@override](/user/override)
  Future<void> scanCodeHandle(String code) async {
    setState(() {
      _code = code;
    });
  }
}

方式二：使用EventChannelFlashScanPlugin

import 'flash_scan_plugin_event_channel.dart';

EventChannelFlashScanPlugin().listen((value) {
  // value 扫描结果
});

EventChannelFlashScanPlugin().cancel();

完整示例Demo

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

import 'package:flutter/services.dart';
import 'package:flash_scan_plugin/flash_scan_plugin.dart';
import 'package:flash_scan_plugin/flash_scan_mixin.dart';

void main() {
  runApp(MaterialApp(
    home: MyApp(),
    routes: <String, WidgetBuilder> {
      '/scan': (BuildContext context) => ScanPage()
    },
  ));
}

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

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

class _MyAppState extends State<MyApp> {
  String _platformVersion = '未知';
  final _flashScanPlugin = FlashScanPlugin();

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

  // 平台消息是异步的，因此我们在异步方法中初始化。
  Future<void> initPlatformState() async {
    String platformVersion;
    // 平台消息可能会失败，因此我们使用带有 PlatformException 的 try/catch。
    // 我们还处理了消息可能返回 null 的情况。
    try {
      platformVersion =
          await _flashScanPlugin.getPlatformVersion() ?? '未知平台版本';
    } on PlatformException {
      platformVersion = '获取平台版本失败。';
    }

    // 如果在异步平台消息还在飞行时小部件从树中移除，我们应该丢弃回复而不是调用
    // setState 来更新我们的不存在的外观。
    if (!mounted) return;

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

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('插件示例应用'),
      ),
      body: Center(
        child: Text('运行于: $_platformVersion\n'),
      ),
      floatingActionButton: FloatingActionButton(
        child: const Icon(Icons.settings_overscan),
        onPressed: () {
          Navigator.of(context).pushNamed('/scan');
        },
      ),
    );
  }
}