Barcode Flutter is a Flutter library for simple and fast Barcode rendering via custom painter.

Features

  • Supports code type: Code39, Code93, Code128, EAN13, EAN8, UPCA, UPCE
  • Supports render with or without text label
  • Supports adjusting the bar width
  • No internet connection required

Installing

You can install the package by adding the following lines to your pubspec.yaml:

dependencies:
    barcode_flutter: ^1.0.0

After adding the dependency to your pubspec.yaml you can run: flutter packages get or update your packages using your IDE.

Getting started

To start, import the dependency in your code:

import 'package:barcode_flutter/barcode_flutter.dart';

Next, to reander a Barcode (Code39 for example), you can use the following code:

new BarCodeImage(
  data: "1234ABCD",              // Code string. (required)
  codeType: BarCodeType.Code39,  // Code type (required)
  lineWidth: 2.0,                // width for a single black/white bar (default: 2.0)
  barHeight: 90.0,               // height for the entire widget (default: 100.0)
  hasText: true,                 // Render with text label or not (default: false)
  onError: (error) {             // Error handler
    print('error = $error');
  },
);

NOTE: You can only tweak the lineWidth parameter to change the entire widget's width. But value less than 2.0 will sometimes make the barcode scaner more difficult to recognize result correctly. 2.0 is a safe value for all code types.

Error handling: You have to make sure the code strings provided are valid. If you are not sure about the data, maybe it comes from user input or something, then setup onError method, and put your error handling logic there. Sometimes the library will render parts of the barcode if the data is invalid, and if that happens, I can't guarantee that the result can be recognized by a barcode scaner.

Example

See the example directory for a basic working example.

FAQ

Has it been tested in production? Can I use it in production?

Yep! I've test it both on Android and iOS devices. Feel free to test it with any barcode scanner.

How about the other barcode types ?

I've only implemented some most commonly used barcode types. But feel free to send PR to include more barcode types.

License

Barcode flutter is released under BSD license. See LICENSE for details.

Libraries

barcode_flutter

Dart

dart:ui
Built-in types and core primitives for a Flutter application. [...]

Core

dart:async
Support for asynchronous programming, with classes such as Future and Stream. [...]
dart:collection
Classes and utilities that supplement the collection support in dart:core. [...]
dart:convert
Encoders and decoders for converting between different data representations, including JSON and UTF-8. [...]
dart:core
Built-in types, collections, and other core functionality for every Dart program. [...]
dart:developer
Interact with developer tools such as the debugger and inspector. [...]
dart:math
Mathematical constants and functions, plus a random number generator. [...]
dart:typed_data
Lists that efficiently handle fixed sized data (for example, unsigned 8 byte integers) and SIMD numeric types. [...]

VM

dart:io
File, socket, HTTP, and other I/O support for non-web applications. [...]
dart:isolate
Concurrent programming using isolates: independent workers that are similar to threads but don't share memory, communicating only via messages. [...]