Flutter二维码扫描插件flutter_cidscan的使用

Flutter插件flutter_cidscan提供了全屏相机条形码扫描预览功能以及创建高性能应用程序所需的所有功能。该插件旨在简化开发过程，减少工作量。

如果您需要更多的用户界面控制或希望使用自己的小部件，可以使用我们的CIDScanView小部件。您可以将该小部件放置在屏幕上的任何位置，并指定所需的大小。

开始使用

要开始使用flutter_cidscan插件，您可以查看我们的在线文档，其中包含教程、示例、移动开发指南以及完整的API参考。

完整示例代码

以下是一个完整的示例代码，展示了如何使用flutter_cidscan插件进行二维码扫描：

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

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

class MyApp extends StatefulWidget {
  [@override](/user/override)
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  var activeTL = false;
  var _visible = false;

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

  void handleLicenseEvent(Map event) async {
    if (event["body"]["FunctionName"].compareTo('onActivationResult') == 0) {
      String value = await FlutterCidscan.decoderVersion();
      print(value);
      // startScanner();
    }
  }

  void handleInit(Map event) async {
    if (event["body"]["FunctionName"].compareTo('initCaptureID') == 0) {
      FlutterCidscan.activateEDKLicense(
        'BNX9965QNM3ahzCaE514DD2zcGruYvEAJw2Aet6zYmxSW20x97BcZyWuzY/m+kckR3zIQB3DucWcvsHLuJK4/+z+lA/0YYf7x9zcwvxxkxr5NYMKl+MtPzoGeOtq+cTv0ThTapUOCsd2tLKzivOd52Y+gVStOJuD1mJchvjMX16Jzk8U/BFvRbuZBLEd6u7FvVzWNAS4tUNXPGvpU8zQNJDlvicgmELUu6dK4wr1VcbxepSpaAC6OW2g9L3Efq8ZTX9PtdAS3SRw4seuwpk5CDo5cS9dQ3vriY+AZVbIaqfkIN0OkbXgJIIAmYIBTgTDP9B2AqXSwYYNgbguOLCGGjrer9oZgpN+SgkhParPOX9ihr81jDMtNKvvDRYYDk5JjZj5e6cerRO1/sPtZ8dofg==',
        'P4I082220190001')!.listen((event) => {handleLicenseEvent(event)});
    }
  }

  void torchlight() {
    if (!activeTL) {
      activeTL = true;
      FlutterCidscan.setTorch(true);
    } else {
      activeTL = false;
      FlutterCidscan.setTorch(false);
    }
  }

  void startScanner() {
    FlutterCidscan.enableAllDecoders(true);
    FlutterCidscan.startCameraPreview();
    FlutterCidscan.startDecoding()!.listen((event) => {handleDecode(event)});
  }

  void restartScanner() {
    FlutterCidscan.startCameraPreview();
    FlutterCidscan.startDecoding()!.listen((event) => {handleDecode(event)});
  }

  void handleDecode(Map event) {
    print(event);
    if (event["body"]["FunctionName"].compareTo('receivedDecodedData') == 0) {
      FlutterCidscan.stopDecoding();
      setState(() {
        _visible = !_visible;
      });
    }
  }

  void _toggle() {
    if (_visible) {
      FlutterCidscan.stopDecoding();
    } else {
      startDecode();
    }
    setState(() {
      _visible = !_visible;
    });
  }

  void startDecode() {
    FlutterCidscan.startDecoding()!.listen((event) => {handleDecode(event)});
  }

  Future<void> init() async {
    FlutterCidscan.initCaptureID('Wir benötigen die Kamera Berechtigung zum Scannen der Barcodes', false, true)!.listen((event) => {handleInit(event)});
  }

  void onCreated(CIDScanViewController ctrl) {}

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Stack(
      alignment: Alignment.topCenter,
      children: <Widget>[
        Container(
          color: Color(0xff619ff9),
        ),
        Visibility(
          visible: _visible,
          child: Container(
            height: 200.0,
            child: new Directionality(
              textDirection: TextDirection.ltr,
              child: CIDScanView(
                height: 200,
                width: 400,
                onCIDScanViewCreated: onCreated,
              ),
            ),
          ),
        ),
        Positioned(
          top: 70,
          left: 30,
          child: Container(
            alignment: Alignment.topCenter,
            height: 50,
            width: 50,
            child: Directionality(
              textDirection: TextDirection.ltr,
              child: ConstrainedBox(
                  constraints: BoxConstraints.expand(),
                  child: TextButton(
                    onPressed: _toggle,
                    child: Image(
                      alignment: Alignment.center,
                      matchTextDirection: true,
                      image: NetworkImage(
                          'https://flutter.github.io/assets-for-api-docs/assets/widgets/owl.jpg'),
                    ),
                  )),
            ),
          ),
        ),
        Positioned(
          top: 70,
          right: 30,
          child: Container(
            alignment: Alignment.topCenter,
            height: 50,
            width: 50,
            child: Directionality(
              textDirection: TextDirection.ltr,
              child: ConstrainedBox(
                  constraints: BoxConstraints.expand(),
                  child: TextButton(
                    onPressed: torchlight,
                    child: Image(
                      alignment: Alignment.center,
                      matchTextDirection: true,
                      image: NetworkImage(
                          'https://flutter.github.io/assets-for-api-docs/assets/widgets/owl.jpg'),
                    ),
                  )),
            ),
          ),
        ),
        Positioned(
          bottom: 200,
          child: Container(
            alignment: Alignment.bottomCenter,
            height: 50,
            width: 150,
            child: Directionality(
              textDirection: TextDirection.ltr,
              child: ConstrainedBox(
                constraints: BoxConstraints.expand(),
                child: TextButton(
                  onPressed: init,
                  child: Text(
                    'Init',
                    style: TextStyle(
                        fontWeight: FontWeight.bold, color: Colors.white),
                  ),
                ),
              ),
            ),
          ),
        ),
        Positioned(
          bottom: 100,
          child: Container(
            alignment: Alignment.bottomCenter,
            height: 50,
            width: 150,
            child: Directionality(
              textDirection: TextDirection.ltr,
              child: ConstrainedBox(
                constraints: BoxConstraints.expand(),
                child: TextButton(
                  onPressed: _toggle,
                  child: Text(
                    'Starten',
                    style: TextStyle(
                        fontWeight: FontWeight.bold, color: Colors.white),
                  ),
                ),
              ),
            ),
          ),
        ),
      ],
    );
  }
}