barcode_keyboard_listener 0.0.1

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barcode_keyboard_listener #

Listens keyboard input from barcode scanner

Most of specialized barcode scanners can return result as an imitation of keyboard input, this library let get the result of this input

Minimalist barcode scaner testing application #

import 'package:flutter/material.dart';
import 'package:barcode_keyboard_listener/barcode_keyboard_listener.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomePage(),

class MyHomePage extends StatefulWidget {
  _MyHomePageState createState() => _MyHomePageState();

class _MyHomePageState extends State<MyHomePage> {
  BarcodeListener _barcodeListener;
  final _tecScanKeyCode = TextEditingController();
  int _scanButtonKeyCode;
  String _scanResult = '';

  void initState() {
    _barcodeListener = BarcodeListener(null, null, _onKeyPress);

  void _onScan(String barcode) async {
    setState(() {
      _scanResult = barcode;

  void _onKeyPress(int keyCode) async {
    setState(() {
      _tecScanKeyCode.text = keyCode.toString();

  void _setScanButtonKeyCode(){
    setState(() {
      if (_barcodeListener != null) {
        _barcodeListener = null;

      _scanButtonKeyCode = int.parse(_tecScanKeyCode.text);
      _barcodeListener = BarcodeListener(_onScan, _scanButtonKeyCode, _onKeyPress);

  Widget build(BuildContext context) {
    final widgetList = List<Widget>();

      Text('Press the scan button, its code will appear in the text field below'),
        controller: _tecScanKeyCode,
        decoration: InputDecoration( suffix: IconButton(
            icon: Icon(Icons.check),
            onPressed: _setScanButtonKeyCode

    if (_tecScanKeyCode.text.isNotEmpty){
      widgetList.add(Text('press "✓" to confirm the selected code'));

    if (_scanButtonKeyCode != null){
        Text('Scan button key code: $_scanButtonKeyCode'),
        Text('Place the scanner on the barcode and press the scan button'),

    if (_scanResult.isNotEmpty) {
      widgetList.add(Text('Barcode: $_scanResult'));

    return Scaffold(
      appBar: AppBar( title: Text('Barcode keyboard listener test')),
      body: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: widgetList

Different devices has a different code for start scanning button. Below is a list with tested devices and button key codes to start scanning for them:

  • "Urovo i6200A" - 120
  • "Urovo i6310" - 520

[0.0.1] - 16.07.2019

  • first release.

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  barcode_keyboard_listener: ^0.0.1

2. Install it

You can install packages from the command line:

with Flutter:

$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:barcode_keyboard_listener/barcode_keyboard_listener.dart';
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Learn more about scoring.

We analyzed this package on Jan 21, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.7.0
  • pana: 0.13.4
  • Flutter: 1.12.13+hotfix.5

Health suggestions

Format lib/barcode_keyboard_listener.dart.

Run flutter format to format lib/barcode_keyboard_listener.dart.

Maintenance issues and suggestions

Homepage URL doesn't exist. (-20 points)

At the time of the analysis the homepage field was unreachable.

The package description is too short. (-17 points)

Add more detail to the description field of pubspec.yaml. Use 60 to 180 characters to describe the package, what it does, and its target use case.

Maintain an example. (-10 points)

Create a short demo in the example/ directory to show how to use this package.

Common filename patterns include main.dart, example.dart, and barcode_keyboard_listener.dart. Packages with multiple examples should provide example/

For more information see the pub package layout conventions.

Package is pre-v0.1 release. (-10 points)

While nothing is inherently wrong with versions of 0.0.*, it might mean that the author is still experimenting with the general direction of the API.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.0.0-dev.68.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.11 1.14.12
meta 1.1.8
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies