Flutter条形码功能插件flutter_feature_barcode的使用

Flutter条形码功能插件flutter_feature_barcode的使用

Description

库用于处理条形码检测，依赖于google_mlkit_barcode_detection。

Key Features

Barcode Detection

处理从图像流中检测条形码。

final featureBarcode = FlutterFeatureBarcode();
Future<void> screenFunction(
    CameraImage cameraImage,
    int sensorOrientation,
    DeviceOrientation deviceOrientation,
    CameraLensDirection cameraLensDirection,
    ) async {
  await featureBarcode.initialize();
  final inputImage = FlutterFeatureBarcode.inputImageFromCameraImage(
    cameraImage,
    sensorOrientation: sensorOrientation,
    deviceOrientation: deviceOrientation,
    cameraLensDirection: cameraLensDirection,
  );
  if (inputImage != null) {
    final barcodes = await featureBarcode.process(inputImage);
    // 处理条形码列表
  }
}

Process Input Image From Pick Image

处理从现有图像或非摄像头图像中检测条形码。

final featureBarcode = FlutterFeatureBarcode();
final picker = ImagePicker();
Future<void> screenFunction() async {
  picker.pickImage(source: ImageSource.gallery).then((xFile) {
    if (xFile != null) {
      featureBarcode.process(InputImage.fromFilePath(xFile.path)).then((barcodes) {
        // 处理条形码列表
      });
    }
  });
}

完整示例Demo

以下是一个完整的示例代码，展示了如何在Flutter应用中使用flutter_feature_barcode插件来检测条形码。

import 'package:example/presentation/main_page.dart';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:flutter_feature_barcode/flutter_feature_barcode.dart';

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

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

  // 这个小部件是你的应用程序的根。
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // 这是你的应用程序的主题。
        //
        // 尝试这个：运行你的应用程序。你会看到应用程序有一个紫色的工具栏。然后，在不退出应用程序的情况下，
        // 尝试将颜色方案中的seedColor改为Colors.green，并执行“热重载”（保存更改或按IDE中的“热重载”按钮，或者如果你使用命令行启动应用程序，则按“r”）。
        //
        // 注意：计数器并没有重置为零；应用程序的状态在重载时不会丢失。要重置状态，使用热重启。
        //
        // 这也适用于代码，不仅仅是值：大多数代码更改都可以通过简单的热重载来测试。
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MainPage(),
    );
  }
}

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

  [@override](/user/override)
  _MainPageState createState() => _MainPageState();
}

class _MainPageState extends State<MainPage> {
  final featureBarcode = FlutterFeatureBarcode();
  
  Future<void> detectBarcodeFromCamera(CameraImage cameraImage, int sensorOrientation, DeviceOrientation deviceOrientation, CameraLensDirection cameraLensDirection) async {
    await featureBarcode.initialize();
    final inputImage = FlutterFeatureBarcode.inputImageFromCameraImage(
      cameraImage,
      sensorOrientation: sensorOrientation,
      deviceOrientation: deviceOrientation,
      cameraLensDirection: cameraLensDirection,
    );
    if (inputImage != null) {
      final barcodes = await featureBarcode.process(inputImage);
      // 处理条形码列表
    }
  }

  Future<void> detectBarcodeFromGallery() async {
    final picker = ImagePicker();
    final xFile = await picker.pickImage(source: ImageSource.gallery);
    if (xFile != null) {
      final barcodes = await featureBarcode.process(InputImage.fromFilePath(xFile.path));
      // 处理条形码列表
    }
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Feature Barcode'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            ElevatedButton(
              onPressed: () {
                // 假设这里获取到CameraImage对象
                // CameraImage cameraImage;
                // int sensorOrientation = 0;
                // DeviceOrientation deviceOrientation = DeviceOrientation.portraitUp;
                // CameraLensDirection cameraLensDirection = CameraLensDirection.back;
                // detectBarcodeFromCamera(cameraImage, sensorOrientation, deviceOrientation, cameraLensDirection);
              },
              child: Text('从相机检测条形码'),
            ),
            ElevatedButton(
              onPressed: () {
                detectBarcodeFromGallery();
              },
              child: Text('从相册选择图片检测条形码'),
            ),
          ],
        ),
      ),
    );
  }
}