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AR Overlay | Android Barcode Scanner


The Barcode AR Overlay can be enabled to display and select recognized barcodes in an augmented-reality fashion. Each recognized barcode will be highlighted by a colored frame and text. Tapping on a barcode will deliver the barcode scanning result to the delegate of the barcode scanner. These tapped/delivered barcodes can be highlighted with a different color. The displayed text is customizable.

The Barcode AR Overlay is available for the Classic UI Barcode Scanner as well as for the RTU UI Barcode Scanner.

Use cases

Displaying an extra layer of information in the live view is useful for a range of scanning use cases. Here are five barcode scanning use cases supporting the AR Overlay:

  • AR-MultiScan: Quickly scan multiple barcodes in one go, highlighting scanned codes.
  • AR-SelectScan: Selectively capture barcodes by tapping them.
  • AR-FindAndPick: Locate specific items with a pre-defined barcode value in a large inventory.
  • AR-ScanAndCount: Count items by scanning their barcodes.
  • AR-BarcodeVision: View additional information about scanned items, such as product or stock details, reviews, or video demos.
Example app

The following use cases have been compiled into a dedicated example app. Too see the complete source code of the code snippets provided here, check out the example app on GitHub.


The MultiScan functionality allows users to hover over multiple barcodes in live view. As a barcode comes into view, it is instantly detected, highlighted with a floating AR overlay, and scanned. This feature is especially useful in scenarios in which users must quickly scan multiple barcodes and manually selecting each one would be too slow.

For example, in a warehouse setting where an employee needs to scan a variety of items in quick succession, MultiScan can speed up the process. The worker simply points their device at the products and each barcode is automatically detected and scanned, with the AR overlay providing visual feedback and confirming successful scans.

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The SelectScan feature allows the user to hover over multiple barcodes in live view, detecting and marking them with an AR overlay. However, instead of automatically scanning every barcode, users must tap the marked barcode to scan them individually. Scanned barcodes are highlighted (i.e., with an overlay in a different color) and marked as scanned. SelectScan is handy when you want to enable users to pick specific barcodes from a group of items.

For example, consider a delivery driver with multiple packages on his truck. He needs to scan and deliver only one or a select few of the loaded packages. All barcodes on the packages are detected and marked as they come into the live view, but only the manually selected ones are actually scanned.

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The FindAndPick feature allows you to pre-define one or more desired barcode values. When users hover over different items in live view, only the pre-defined items are highlighted and selected. Items that do not match the value are marked as mismatching, for example by a differently colored overlay. This feature is ideal for finding specific items in a large inventory.

Consider a situation in a large car parts store. An employee can use FindAndPick to quickly locate a specific part requested by a customer. They pre-define the part's barcode so that the system can automatically highlight the desired item among dozens – saving the employee valuable time.

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The ScanAndCount feature offers the ability to hover over multiple barcodes in live view, scanning each detected barcode and keeping a count of the scanned items. This functionality can be customized to detect only a particular barcode type or a pre-defined list of barcodes. As you hover over the barcodes, the correct ones are checked off from the list, and those not on the list are flagged.

Consider a retail setting. During stocktaking, a worker can use ScanAndCount to verify the number of a particular product on the shelves. Alternatively, the worker can scan the items at hand based on a pre-defined list and thus check for completeness.

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The BarcodeVision feature allows for displaying additional content on the screen as an overlay. For example, the content can be fetched from your database to give users additional information without having to switch views. The information can be displayed once a barcode is detected or only when users come closer to a barcode, implying that they want more information.

Imagine a retail application. Thanks to the Scanbot SDK, app users can scan barcodes on product labels using their mobile app. The app fetches detailed product information from the store's database and displays it on the screen as an overlay. This can include product specifications, user reviews, or even video demonstrations.

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AR Overlay UI components

The section above provides some concrete use cases for the AR Overlay, accompanied by code snippets from a dedicated example app. This should allow you to get your first prototype up and running quickly.

However, when creating your own solution, you can take advantage of the Ready-to-Use Barcode Scanner components of the Scanbot SDK or its Classic Components. The Ready-To-Use UI (RTU UI) components offer a suite of straightforward, customizable high-level components designed for common tasks. On the other hand, Classic Components provide the flexibility to build fully personalized UI components.

Ready-To-Use UI Components

The capabilities of the AR Overlay and how to configure it for the RTU UI Barcode Scanner are covered in the RTU UI Use Cases section.

Classic Components

BarcodeScannerView allows for enabling a Barcode Selection Overlay that displays a contour of the barcode in front of the camera preview (AR-like). It is possible to customize the polygon itself and also the view shown below the barcode contour (which might be used for displaying a text value or an image corresponding to the barcode).

To enable barcode selection overlay, the following functions are required:

barcodeScannerView.viewController.apply {
// This is important for Selection Overlay to work properly
barcodeDetectionInterval = 0

To set up a custom view for the result displayed below the contour, use the following methods:

// Simple result storage to showcase the custom view
private val resultsMap = hashMapOf<String, Long>()
// Setting a Factory for the Views
barcodeScannerView.selectionOverlayController.setBarcodeItemViewFactory(object : BarcodePolygonsView.BarcodeItemViewFactory {
override fun createView(): View {
val inflater = LayoutInflater.from(this@BarcodeScannerViewActivity)
return inflater.inflate(R.layout.custom_view_for_ar, barcodeScannerView, false)
// Setting a binding callback when the View is bound to the corresponding barcode
barcodeScannerView.selectionOverlayController.setBarcodeItemViewBinder(object : BarcodePolygonsView.BarcodeItemViewBinder {
override fun bindView(view: View, barcodeItem: BarcodeItem, shouldHighlight: Boolean) {
val textWithExtension = barcodeItem.textWithExtension
val progressView = view.findViewById<ProgressBar>(
if (!resultsMap.containsKey(textWithExtension)) {
// TODO: here we emulate loading info from the database/internet
resultsMap[textWithExtension] = System.currentTimeMillis() + 2500
val valueTextView = view.findViewById<TextView>(
val resultIsReady = resultsMap[textWithExtension]!! < System.currentTimeMillis()
progressView.isVisible = !resultIsReady
valueTextView.isVisible = resultIsReady
valueTextView.text = textWithExtension

Set appearance configuration:

barcodeScannerView.selectionOverlayController.setBarcodeAppearanceDelegate(object :
BarcodePolygonsView.BarcodeAppearanceDelegate {
override fun getPolygonStyle(
defaultStyle: BarcodePolygonsView.BarcodePolygonStyle,
barcodeItem: BarcodeItem
): BarcodePolygonsView.BarcodePolygonStyle {
return defaultStyle.copy(
strokeWidth = overlayStrokeWidth,
fillColor = overlayPolygonColor,
fillHighlightedColor = overlayHighlightedPolygonColor,
strokeColor = overlayPolygonColor,
strokeHighlightedColor = overlayHighlightedPolygonColor,

override fun getTextViewStyle(
defaultStyle: BarcodePolygonsView.BarcodeTextViewStyle,
barcodeItem: BarcodeItem
): BarcodePolygonsView.BarcodeTextViewStyle {
return defaultStyle.copy(
textColor = overlayTextColor,
textHighlightedColor = overlayTextHighlightedColor,
textContainerColor = overlayTextContainerColor,
textContainerHighlightedColor = overlayTextContainerHighlightedColor,
textFormat = overlayTextFormat

Scan And Count

Scan And Count allows you to effortlessly capture 1D and 2D barcodes with a single tap. You can scan multiple codes per scan, and scan as many times as you want. The scanner automatically tracks the number of times each code has been detected over multiple scans. These codes are stored as an array in the countedBarcodes property.

The Scan And Count feature can be integrated into the application using Classic UI components.

val scanbotSDK = ScanbotSDK(this)
val barcodeDetector = scanbotSDK.createBarcodeDetector()

// whether to run detection on snapped image or on the preview

object : IBarcodeScanCountViewCallback {
override fun onScanAndCountStarted() {
//here you can start to show some progress animation

override fun onLicenseError() {
//stop progress animation

override fun onScanAndCountFinished(barcodes: List<BarcodeItem>) {
//stop progress animation
// `barcodes` - list of barcodes of last scan

override fun onCameraOpen() {
//camera is initialized and preview is shown

To get all scanned barcodes and their count for the whole session:

val scannedBarcodes =

Set appearance configuration:

    barcodeCounterView.counterOverlayController.setBarcodeAppearanceDelegate(object :
BarcodePolygonsStaticView.BarcodeAppearanceDelegate {
override fun getPolygonStyle(
defaultStyle: BarcodePolygonsStaticView.BarcodePolygonStyle,
barcodeItem: BarcodeItem
): BarcodePolygonsStaticView.BarcodePolygonStyle {
return defaultStyle.copy(
drawPolygon = drawPolygon,
strokeWidth = strokeWidth,
strokeColor = strokeColor,
fillColor = fillColor,
cornerRadius = cornerRadius,

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