ai_barcode_scanner 0.0.4

A universal AI barcode and QR code scanner for Flutter based on MLKit. Uses CameraX on Android, AVFoundation on iOS and Apple Vision & AVFoundation on macOS.

ai_barcode_scanner

AI barcode and QR code scanner for Flutter based on MLKit. Uses CameraX on Android, AVFoundation on iOS and Apple Vision & AVFoundation on macOS based on mobile_scanner.

Platform Support

Android	iOS	macOS	Web	Linux	Windows
✔	✔	✔	✔	❌	❌

Video	Screenshot

Note:

This plugin is based on the mobile_scanner plugin by steenbakker.dev.

I recommend you to read the mobile_scanner plugin's documentation.

Android

SDK 21 and newer. Reason: CameraX requires at least SDK 21. Also, make sure you upgrade kotlin to the latest version in your project.

This packages uses the bundled version of MLKit Barcode-scanning for Android. This version is more accurate and immediately available to devices. However, this version will increas the size of the app with approximately 3 to 10 MB. The alternative for this is to use the unbundled version of MLKit Barcode-scanning for Android. This version is older than the bundled version however this only increases the size by around 600KB.

To use this version you must alter the ai_barcode_scanner gradle file to replace com.google.mlkit:barcode-scanning:17.0.2 with com.google.android.gms:play-services-mlkit-barcode-scanning:18.0.0. Keep in mind that if you alter the gradle files directly in your project it can be overriden when you update your pubspec.yaml. I am still searching for a way to properly replace the module in gradle but have yet to find one.

You can read more about the difference between the two versions here.

iOS

iOS 11 and newer. Reason: MLKit for iOS requires at least iOS 10 and a 64bit device.

Add the following keys to your Info.plist file, located in

NSCameraUsageDescription - describe why your app needs access to the camera. This is called Privacy - Camera Usage Description in the visual editor.

If you want to use the local gallery feature from image_picker

NSPhotoLibraryUsageDescription - describe why your app needs permission for the photo library. This is called Privacy - Photo Library Usage Description in the visual editor.

macOS

macOS 10.13 or newer. Reason: Apple Vision library.

Web

Add this to web/index.html:

<script src="https://cdn.jsdelivr.net/npm/jsqr@1.4.0/dist/jsQR.min.js"></script>

Web only supports QR codes for now. Do you have experience with Flutter Web development? Help me with migrating from jsQR to qr-scanner for full barcode support!

Usage

Import package:ai_barcode_scanner/ai_barcode_scanner.dart, and use the widget with or without the controller.

If you don't provide a controller, you can't control functions like the torch(flash) or switching camera.

If you don't set allowDuplicates to false, you can get multiple scans in a very short time, causing things like pop() to fire lots of times.

import 'package:ai_barcode_scanner/ai_barcode_scanner.dart';

/// Simple example of using the barcode scanner.
AiBarcodeScanner(
        onScan: (String value) {
          debugPrint(value);
        },
      ),

/// Example of using the barcode scanner with a controller.
AiBarcodeScanner(
        controller: MobileScannerController(),
          onScan: (String value) {
            debugPrint(value);
          },
      ),

/// Example of using the barcode scanner with validation.
/// Validator works on the raw string, not the decoded value.
/// If you want to validate the scanner, use the [validateText] and [validateType] parameters.
AiBarcodeScanner(
        validateText: 'https://',
        validateType: ValidateType.startsWith,
          onScan: (String value) {
            debugPrint(value);
          },
      ),

BarcodeCapture

The onDetect function returns a BarcodeCapture objects which contains the following items.

Property name	Type	Description
barcodes	List	A list with scanned barcodes.
image	Uint8List?	If enabled, an image of the scan.

You can use the following properties of the Barcode object.

Property name	Type	Description
format	BarcodeFormat
rawBytes	Uint8List?	binary scan result
rawValue	String?	Value if barcode is in UTF-8 format
displayValue	String?
type	BarcodeType
calendarEvent	CalendarEvent?
contactInfo	ContactInfo?
driverLicense	DriverLicense?
email	Email?
geoPoint	GeoPoint?
phone	Phone?
sms	SMS?
url	UrlBookmark?
wifi	WiFi?	WiFi Access-Point details

Thanks to

The mobile_scanner plugin by steenbakker.dev.

This package depends on mobile_scanner

I recommend you to read the mobile_scanner plugin's documentation.

Parameters of the widget

  /// Function that gets Called when barcode is scanned successfully
  ///
  final void Function(String) onScan;

  /// Function that gets called when a Barcode is detected.
  ///
  /// [barcode] The barcode object with all information about the scanned code.
  /// [args] Information about the state of the MobileScanner widget
  final void Function(BarcodeCapture)? onDetect;

  /// Validate barcode text with [ValidateType]
  /// [validateText] and [validateType] must be set together.
  final String validateText;

  /// Validate type [ValidateType]
  /// Validator working with single string value only.
  final ValidateType? validateType;

  /// Set to false if you don't want duplicate barcode to be detected
  final bool allowDuplicates;

  /// Fit to screen
  final BoxFit fit;

  /// Barcode controller (optional)
  final MobileScannerController? controller;

  /// Show overlay or not (default: true)
  final bool showOverlay;

  /// Overlay border color (default: white)
  final Color borderColor;

  /// Overlay border width (default: 10)
  final double borderWidth;

  /// Overlay color
  final Color overlayColor;

  /// Overlay border radius (default: 10)
  final double borderRadius;

  /// Overlay border length (default: 30)
  final double borderLength;

  /// Overlay cut out width (optional)
  final double? cutOutWidth;

  /// Overlay cut out height (optional)
  final double? cutOutHeight;

  /// Overlay cut out offset (default: 0)
  final double cutOutBottomOffset;

  /// Overlay cut out size (default: 300)
  final double cutOutSize;

  /// Hint widget (optional) (default: Text('Scan QR Code'))
  /// Hint widget will be replaced the bottom of the screen.
  /// If you want to replace the bottom screen widget, use [hintWidget]
  final Widget? hintWidget;

  /// Hint text (default: 'Scan QR Code')
  final String hintText;

  /// Hint margin
  final EdgeInsetsGeometry hintMargin;

  /// Hint padding
  final EdgeInsetsGeometry hintPadding;

  /// Hint background color (optional)
  final Color? hintBackgroundColor;

  /// Hint text style
  final TextStyle hintTextStyle;

  /// Show error or not (default: true)
  final bool showError;

  /// Error color (default: red)
  final Color errorColor;

  /// Error text (default: 'Invalid BarCode')
  final String errorText;

  /// Show success or not (default: true)
  final bool showSuccess;

  /// Success color (default: green)
  final Color successColor;

  /// Success text (default: 'BarCode Found')
  final String successText;

  /// Can auto back to previous page when barcode is successfully scanned (default: true)
  final bool canPop;

  /// The function that builds an error widget when the scanner
  /// could not be started.
  ///
  /// If this is null, defaults to a black [ColoredBox]
  /// with a centered white [Icons.error] icon.
  final Widget Function(BuildContext, MobileScannerException, Widget?)?
      errorBuilder;

  /// The function that builds a placeholder widget when the scanner
  /// is not yet displaying its camera preview.
  ///
  /// If this is null, a black [ColoredBox] is used as placeholder.
  final Widget Function(BuildContext, Widget?)? placeholderBuilder;

  ///The function that signals when the barcode scanner is started.
  final void Function(MobileScannerArguments?)? onScannerStarted;

  /// if set barcodes will only be scanned if they fall within this [Rect]
  /// useful for having a cut-out overlay for example. these [Rect]
  /// coordinates are relative to the widget size, so by how much your
  /// rectangle overlays the actual image can depend on things like the
  /// [BoxFit]
  final Rect? scanWindow;

  /// Only set this to true if you are starting another instance of mobile_scanner
  /// right after disposing the first one, like in a PageView.
  ///
  /// Default: false
  final bool? startDelay;