flutter_barcode_sdk 0.0.1

A flutter plugin project for Dynamsoft Barcode Reader.

example/lib/main.dart

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

import 'package:camera/camera.dart';
import 'package:flutter/services.dart';
import 'package:flutter_barcode_sdk/flutter_barcode_sdk.dart';
import 'dart:typed_data';

Future<void> main() async {
  // Ensure that plugin services are initialized so that `availableCameras()`
  // can be called before `runApp()`
  WidgetsFlutterBinding.ensureInitialized();

  // Obtain a list of the available cameras on the device.
  final cameras = await availableCameras();

  // Get a specific camera from the list of available cameras.
  final firstCamera = cameras.first;

  runApp(
    MaterialApp(
      theme: ThemeData.dark(),
      home: TakePictureScreen(
        // Pass the appropriate camera to the TakePictureScreen widget.
        camera: firstCamera,
      ),
    ),
  );
}

// A screen that allows users to take a picture using a given camera.
class TakePictureScreen extends StatefulWidget {
  final CameraDescription camera;

  const TakePictureScreen({
    Key key,
    @required this.camera,
  }) : super(key: key);

  @override
  TakePictureScreenState createState() => TakePictureScreenState();
}

class TakePictureScreenState extends State<TakePictureScreen> {
  CameraController _controller;
  Future<void> _initializeControllerFuture;
  FlutterBarcodeSdk _barcodeReader;

  @override
  void initState() {
    super.initState();
    // To display the current output from the Camera,
    // create a CameraController.
    _controller = CameraController(
      // Get a specific camera from the list of available cameras.
      widget.camera,
      // Define the resolution to use.
      ResolutionPreset.medium,
    );

    // Next, initialize the controller. This returns a Future.
    _initializeControllerFuture = _controller.initialize();
    // Initialize Dynamsoft Barcode Reader
    initDynamsoftBarcodeReaderState();
  }

  Future<void> initDynamsoftBarcodeReaderState() async {
    _barcodeReader = FlutterBarcodeSdk();
    await _barcodeReader.initLicense('LICENSE-KEY');
  }

  @override
  void dispose() {
    // Dispose of the controller when the widget is disposed.
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Flutter Barcode Reader')),
      // Wait until the controller is initialized before displaying the
      // camera preview. Use a FutureBuilder to display a loading spinner
      // until the controller has finished initializing.
      body: FutureBuilder<void>(
        future: _initializeControllerFuture,
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.done) {
            // If the Future is complete, display the preview.
            return CameraPreview(_controller);
          } else {
            // Otherwise, display a loading indicator.
            return Center(child: CircularProgressIndicator());
          }
        },
      ),
      floatingActionButton: FloatingActionButton(
        child: Icon(Icons.camera_alt),
        // Provide an onPressed callback.
        onPressed: () async {
          // Take the Picture in a try / catch block. If anything goes wrong,
          // catch the error.
          try {
            // Ensure that the camera is initialized.
            await _initializeControllerFuture;

            // Attempt to take a picture and get the file `image`
            // where it was saved.
            final image = await _controller.takePicture();
            String results = await _barcodeReader.decodeFile(image?.path);
            // Uint8List bytes = await image.readAsBytes();
            // String results = await _barcodeReader.decodeBytes(bytes);

            // If the picture was taken, display it on a new screen.
            Navigator.push(
              context,
              MaterialPageRoute(
                builder: (context) => DisplayPictureScreen(
                    // Pass the automatically generated path to
                    // the DisplayPictureScreen widget.
                    imagePath: image?.path,
                    barcodeResults: results),
              ),
            );
          } catch (e) {
            // If an error occurs, log the error to the console.
            print(e);
          }
        },
      ),
    );
  }
}

// A widget that displays the picture taken by the user.
class DisplayPictureScreen extends StatelessWidget {
  final String imagePath;
  final String barcodeResults;

  const DisplayPictureScreen({Key key, this.imagePath, this.barcodeResults})
      : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Dynamsoft Barcode Reader')),
      // The image is stored as a file on the device. Use the `Image.file`
      // constructor with the given path to display the image.
      body: Stack(
        alignment: const Alignment(0.0, 0.0),
        children: [
          // Show full screen image: https://stackoverflow.com/questions/48716067/show-fullscreen-image-at-flutter
          Image.file(
            File(imagePath),
            fit: BoxFit.cover,
            height: double.infinity,
            width: double.infinity,
            alignment: Alignment.center,
          ),
          Container(
            decoration: BoxDecoration(
              color: Colors.black45,
            ),
            child: Text(
              // 'Dynamsoft Barcode Reader',
              barcodeResults,
              style: TextStyle(
                fontSize: 20,
                fontWeight: FontWeight.bold,
                color: Colors.white,
              ),
            ),
          ),
        ],
      ),
    );
  }
}