M.4 Scan Barcodes

Barcode Scanning

With ML Kit's barcode scanning API, you can read data encoded using most standard barcode formats.

Barcodes are a convenient way to pass information from the real world to your app. In particular, when using 2D formats such as QR code, you can encode structured data such as contact information or WiFi network credentials. Because ML Kit can automatically recognize and parse this data, your app can respond intelligently when a user scans a barcode.

NOTICE: This is a beta release of ML Kit for Firebase. This API might be changed in backward-incompatible ways and is not subject to any SLA or deprecation policy.

Create a VisionImage first:

import com.myflashlab.air.extensions.firebase.mlkit.*;

// initialize ML Kit AFTER FirebaseCore is successfully started
Mlkit.init();

/*
    You can create VisionImage instance from BitmapData, File or ByteArray

    Mlkit.createVisionImageFromBitmapData
    Mlkit.createVisionImageFromFile
    Mlkit.createVisionImageFromBytes
*/

var image:File = File.applicationDirectory.resolvePath("img.jpg");

// This is beta version and for some reason, creating vision 
// images from file is not working! instead you may use 
// BitmapData for now!

var loader:Loader = new Loader();
loader.load(new URLRequest(image.url));
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, function loaderComplete(e:Event):void
{
	var bm:Bitmap = e.target.content as Bitmap;

	// create a VisionImage
	var visionImg:VisionImage = Mlkit.createVisionImageFromBitmapData(bm.bitmapData);
				
	trace("visionImg.id = " + visionImg.id);
});

Extract information from the image

// (Optional) initialize an instance of BarcodeDetectorOptions
//var options:BarcodeDetectorOptions = new BarcodeDetectorOptions();
//options.barcodeFormats = 

var detector:BarcodeDetector = Mlkit.initBarcodeDetector(options);
detector.process(visionImg,function ($barcodes:Vector.<VisionBarcode>, $error:Error):void
{
    if($error) trace($error.message);
	
	if($barcodes)
	{
		trace("--------- VisionBarcode ------");
		for(var i:int=0; i < $barcodes.length; i++)
		{
			var barcode:VisionBarcode = $barcodes[i];
			trace("\t" + barcode.toString());
		}
		trace("------------------------------");
	}
				
	detector.close();
});