barcode.dart

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

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => new _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String barcode = "";

  @override
  initState() {
    super.initState();
  }

  File galleryFile;

  imageSelectorGallery() async {
    galleryFile = await ImagePicker.pickImage(
      source: ImageSource.gallery,
// maxHeight: 50.0,
// maxWidth: 50.0,
    );
    print("You selected gallery image : " + galleryFile.path);
    setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      home: new Scaffold(
          appBar: new AppBar(
            title: new Text('Scan Barcode'),
          ),
          body: new Center(
            child: new Column(
              children: <Widget>[
                new Container(
                  child: new RaisedButton(
                      onPressed: barcodeScanning, child: new Text("Capture image")),
                  padding: const EdgeInsets.all(8.0),
                ),
                new Padding(
                  padding: const EdgeInsets.all(8.0),
                ),
                new Text("Barcode Number after Scan : " + barcode),
                // displayImage(),
              ],
            ),
          )),
    );
  }

  Widget displayImage() {
    return new SizedBox(
      height: 300.0,
      width: 400.0,
      child: galleryFile == null
          ? new Text('Sorry nothing to display')
          : new Image.file(galleryFile),
    );
  }

// Method for scanning barcode....
  Future barcodeScanning() async {
//imageSelectorGallery();

    try {
      String barcode = await BarcodeScanner.scan();
      setState(() => this.barcode = barcode);
    } on PlatformException catch (e) {
      if (e.code == BarcodeScanner.CameraAccessDenied) {
        setState(() {
          this.barcode = 'No camera permission!';
        });
      } else {
        setState(() => this.barcode = 'Unknown error: $e');
      }
    } on FormatException {
      setState(() => this.barcode =
          'Nothing captured.');
    } catch (e) {
      setState(() => this.barcode = 'Unknown error: $e');
    }
  }
}