Deprecation warning

Please note that this is outdated documentation for an older release of the Scandit Barcode Scanner SDK.

We are deprecating the 5.x API on all platforms (except Linux). Release 5.19 in April 2021 will be our final. Applications running 5.x will continue to work, and we will continue to release critical bug fixes and security patches only, for one year. We encourage you to migrate to 6.x and take advantage of our latest / advanced features and improved performance.

You'll find the updated documentation at: Data Capture SDK Documentation for Xamarin.Android and Data Capture SDK Documentation for Xamarin.iOS

Integrate the Scandit Barcode Scanner into your app

This guide shows how to use the unified API for scanning barcodes in your application.

Get the Scandit Barcode Scanner

The unified barcode scanner API is available as a NuGet package and can easily be installed via For details on how to add a NuGet package to your project, take a look at the guides for Xamarin Studio, or Visual Studio. Search for the Scandit.BarcodePicker.Unified package and add it to your project. You will need to add a reference to the portable class library where your barcode scanning logic is going to be implemented, and to the iOS/Android and Windows applications. The latter is required to also include the platform-specific portion of the code into your app.

Windows: Modify the App Manifest

These instructions only apply if you are also targeting Windows. You will have to make a few changes to the app manifest:

  • Update the App manifest to include microphone and webcam capabilities. Without it you will get a null-pointer exception when trying to initialize scanner.
  • Update the app manifest XML to contain the following extension. This class is required for accessing the raw camera frames from the VideoInputRT dll.
<Extension Category="windows.activatableClass.inProcessServer">
<ActivatableClass ActivatableClassId="VideoInputRT.FrameAccess" ThreadingModel="both" />

Add the barcode scanner namespace to easily access its classes

If you don't want to type the whole namespace each time when using the scanner you should add a using directive at the top of the class you will use the scanner in:

Set the app key

Sign in to your account at to look up your app key in the Download section.

App Key in your account

The application key must be set before you use the barcode picker for the first time. Typically you will put this code into the Page constructor that uses the barcode picker:

// must be set before you use the picker for the first time.
ScanditService.ScanditLicense.AppKey = "-- ENTER YOUR SCANDIT LICENSE KEY HERE --";

Add code to start the scanning process

In the unified API, the barcode picker is a singleton whose instance will be different depending on the platform the code runs on. To scan a barcode, these 3 steps are neccessary. 1. configure the barcode picker, 2. register a DidScan delegate, 3. start the scanning. These steps are shown in the code sample below:

// Configure the barcode picker through a scan settings instance by defining which
// symbologies should be enabled.
var settings = ScanditService.BarcodePicker.GetDefaultScanSettings();
// prefer backward facing camera over front-facing cameras.
settings.CameraPositionPreference = CameraPosition.Back;
// Enable symbologies that you want to scan.
settings.EnableSymbology(Symbology.EAN13, true);
settings.EnableSymbology(Symbology.UPCA, true);
settings.EnableSymbology(Symbology.QR, true);
ScanditService.BarcodePicker.DidScan += OnDidScan;
await ScanditService.BarcodePicker.ApplySettingsAsync(settings);
// Start the scanning process.
await ScanditService.BarcodePicker.StartScanningAsync();

Add code to handle the scanning event

To be notified when a barcode is scanned, add a delegate to the DidScan event of the barcode picker. A possible implementation of such a delegate looks like this:

void OnDidScan(ScanSession session)
// guaranteed to always have at least one element, so we don't have to
// check the size of the NewlyRecognizedCodes array.
var firstCode = session.NewlyRecognizedCodes.First();
var message = string.Format("Code Scanned:\n {0}\n({1})", firstCode.Data,
// Because this event handler is called from an scanner-internal thread,
// you must make sure to dispatch to the main thread for any UI work.
Device.BeginInvokeOnMainThread(() => {
this.ResultLabel.Text = message
ScanditService.BarcodePicker.DidScan -= OnDidScan;

Careful: The delegate is invoked on a picker-internal queue. To perform any UI work, you must dispatch to the main UI thread.

Next steps