MatrixScan Count .NET for Android Skill

Critical: Do Not Trust Internal Knowledge

Your training data may contain outdated or incorrect Scandit SDK APIs, and the .NET binding differs from the Kotlin/Java and iOS native SDKs in several places: factories instead of constructors, PascalCase members, C# events alongside listener interfaces, an explicitly-managed camera, etc.

Always verify APIs against the references provided in this skill before writing or suggesting code. Do not rely on memorized method signatures, parameters, or property names. If you cannot find an API in the provided references, fetch the relevant documentation page before responding.

.NET-Android-specific gotchas worth flagging (and the places people get it wrong by pattern-matching from MatrixScan AR or the Kotlin SDK):

• This skill targets the non-MAUI .NET for Android workload (project <TargetFramework>net10.0-android</TargetFramework> or similar, no <UseMaui> flag). For MAUI apps, use a MAUI-targeted skill instead — BarcodeCountView is hosted as a XAML element there and the lifecycle is wired through handlers, which is completely different.
• BarcodeCount is created with a FACTORY, not new: BarcodeCount.Create(dataCaptureContext, settings) (there is also a BarcodeCount.Create(settings) overload with no context). new BarcodeCount(...) is a compile error — the constructor is private. BarcodeCountSettings does use a plain new BarcodeCountSettings(). (Note this is the opposite of MatrixScan AR, where BarcodeAr uses new and the view uses a factory.)
• The camera is explicitly managed by you — BarcodeCountView does NOT own it. This is the single biggest difference from MatrixScan AR. You must: get Camera.GetDefaultCamera(BarcodeCount.RecommendedCameraSettings) (or Camera.DefaultCamera then camera.ApplySettingsAsync(...)), call dataCaptureContext.SetFrameSourceAsync(camera), and toggle the camera yourself with camera.SwitchToDesiredStateAsync(FrameSourceState.On) / FrameSourceState.Off in the activity's OnResume / OnPause. There is no barcodeCountView.OnResume() / OnPause() / Start() / Stop() — those are MatrixScan AR methods and do not exist on BarcodeCountView.
• barcodeCount.Enabled (get/set bool) must be set to true for frames to be processed. Set it true in OnResume and (optionally) false in OnPause. BarcodeAr has no such toggle; BarcodeCount does.
• BarcodeCountView.Create(Context, DataCaptureContext, BarcodeCount [, BarcodeCountViewStyle]) takes the Android Context (the activity) as its first argument — not a parentView/ViewGroup (that's the AR signature). The style overload takes BarcodeCountViewStyle.Icon (default look) or BarcodeCountViewStyle.Dot.
• BarcodeCountView IS a real Android View (via public static implicit operator View(BarcodeCountView)). You add it to the hierarchy yourself: container.AddView(barcodeCountView). This is the opposite of BarcodeArView, which is not a View and auto-attaches itself. Do not look for an auto-attach parentView argument on BarcodeCountView.Create.
• IBarcodeCountListener has THREE methods: OnScan(BarcodeCount, BarcodeCountSession, IFrameData), OnObservationStarted(BarcodeCount), OnObservationStopped(BarcodeCount). (MatrixScan AR's listener has only one — do not assume parity.) The idiomatic C# alternative is the barcodeCount.Scanned event (EventHandler<BarcodeCountEventArgs>), which corresponds to OnScan only.
• Scanned / OnScan fires once per scan phase, on a background thread. Copy the barcodes you need out of the session immediately (session.RecognizedBarcodes.ToList()); the BarcodeCountSession is not valid outside the callback. Dispatch UI updates via RunOnUiThread(...).
• BarcodeCountSession exposes RecognizedBarcodes and AdditionalBarcodes as IList<Barcode> — plain decoded barcodes, not tracked-barcode deltas. There is no AddedTrackedBarcodes / RemovedTrackedBarcodes on this session (that's the AR/Batch session). Also FrameSequenceId, Reset(), and GetSpatialMap().
• BarcodeCountFeedback uses Success and Failure (Core.Common.Feedback.Feedback), not Scanned / Tapped (those are AR). The empty constructor new BarcodeCountFeedback() is silent on both; the static BarcodeCountFeedback.DefaultFeedback (a property, not a method) restores defaults.
• Symbology names are C# PascalCase: Symbology.Ean13Upca, Symbology.Ean8, Symbology.Upce, Symbology.Code128, Symbology.Code39, Symbology.Qr, Symbology.DataMatrix, Symbology.InterleavedTwoOfFive. They are not the Kotlin underscore style (EAN13_UPCA).
• List / Exit / Single-Scan buttons are surfaced as C# events on BarcodeCountView: ListButtonTapped (ListButtonTappedEventArgs), ExitButtonTapped (ExitButtonTappedEventArgs), SingleScanButtonTapped (SingleScanButtonTappedEventArgs) — each exposes .View. Brush/tap customization is the Listener property (IBarcodeCountViewListener), which is a separate concern from these events.
• Capture list (receiving) uses factories: BarcodeCountCaptureList.Create(listener, IList<TargetBarcode>) and TargetBarcode.Create(data, quantity). Apply it with barcodeCount.SetBarcodeCountCaptureList(list). The listener IBarcodeCountCaptureListListener has OnObservationStarted(), OnObservationStopped(), OnCaptureListSessionUpdated(session), OnCaptureListCompleted(session).
• SDK 8.0+ requires explicit initialization. Subclass Android.App.Application, decorate with [Application], and call ScanditCaptureCore.Initialize() + ScanditBarcodeCapture.Initialize() in OnCreate() before any Scandit code runs. Without this, the first DataCaptureContext.ForLicenseKey(...) / BarcodeCount.Create(...) call crashes at launch because the DI container has no registrations. Not required on 6.x / 7.x. See [references/integration.md](references/integration.md) for the full MainApplication.cs template.
• The NuGet packages are Scandit.DataCapture.Core and Scandit.DataCapture.Barcode. No separate *.Maui packages here — those are only for MAUI projects. Do not guess the version from training data — fetch the latest stable from https://www.nuget.org/packages/Scandit.DataCapture.Barcode/ via WebFetch before pinning. Inventing a non-existent version (e.g. 8.13.0 when only 8.4.0 is published) causes dotnet restore to fail with Unable to find package Scandit.DataCapture.Core with version (>= …). See [references/integration.md](references/integration.md) Step 0.
• Android SupportedOSPlatformVersion must be ≥ 24. Set it in the .csproj. Lower values fail the build with uses-sdk:minSdkVersion 21 cannot be smaller than version 24 declared in library.
• Do not declare <activity> elements for [Activity]-decorated classes in AndroidManifest.xml. The [Activity(MainLauncher = true, ...)] attribute is the canonical registration mechanism in .NET for Android — the build merges a correctly-named entry into the final manifest. A manual <activity android:name=".MainActivity"> resolves against <ApplicationId> and won't match the generated class, producing ClassNotFoundException at launch. Only add to the manifest the elements the skill explicitly asks for (<uses-feature>, <uses-permission>).
• The runtime camera permission helper (CameraPermissionActivity) inherits from AppCompatActivity, so Xamarin.AndroidX.AppCompat must be in the .csproj. When pinning the version, pick the highest available including the Xamarin patch revision (e.g. 1.7.0.5, not bare 1.7.0) — the .X suffix marks Xamarin-binding-level updates and carries critical transitive-dep fixes.
• The activity needs a Theme.AppCompat descendant (because it inherits from AppCompatActivity). Set android:theme on <application> in the manifest (the sample uses @style/AppTheme, an AppCompat descendant) or Theme = "@style/Theme.AppCompat..." on the [Activity] attribute. Without it, SetContentView throws IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity at launch.

Intent Routing

Based on the user's request, load the appropriate reference file before responding:

• Integrating BarcodeCount from scratch, configuring settings, hosting the BarcodeCountView, wiring camera lifecycle, handling scan results, storing scanned barcodes, capture/receiving lists, the spatial map, customizing feedback, List/Exit/SingleScan taps, brushes, status mode, or the not-in-list action (e.g. "add MatrixScan Count to my .NET Android app", "count barcodes in C#", "store the scanned barcodes when the list button is tapped", "check scans against an expected list", "make the beep silent", "use the Dot style", "show a not-in-list action") → read [references/integration.md](references/integration.md) and follow the instructions there.
• Migrating or upgrading an existing MatrixScan Count integration (e.g. "upgrade from v7 to v8", "bump the Scandit .NET SDK to v8", "what changed between SDK versions for BarcodeCount") → read [references/migration.md](references/migration.md) and follow the instructions there.

API Usage Policy

Only use APIs that are explicitly documented in the Scandit references below. Do not invent or guess method signatures, parameters, or property names. If unsure whether an API exists or how it is called — or if a compile error occurs — fetch the relevant reference page before responding. Do not tell the user to check the docs themselves. After answering, always include the relevant link so the user can explore further.

Never construct or guess documentation URLs. When you need a specific class or property's API page:

1. First check whether the page you already fetched contains a direct hyperlink to it — topic pages link directly to relevant API symbols. Always request links alongside content in your fetch prompt.
2. If no direct link was found, fetch the API index (see Full API reference in the table below), extract the actual link from it, and follow that.

URL structures can vary (e.g. api/ui/ subdirectory) and guessing will lead to 404s.

References

Direct users to the right resource based on their question:

API surface this skill covers

All classes documented with :available: dotnet.android in the official RST docs (docs/source/barcode-capture/api/barcode-count.rst and api/ui/barcode-count-.rst) are addressed in [references/integration.md](references/integration.md):

• BarcodeCount — static Create(DataCaptureContext?, BarcodeCountSettings) / Create(BarcodeCountSettings), Context (get), Feedback (get/set), Enabled (get/set), static RecommendedCameraSettings, ApplySettingsAsync(BarcodeCountSettings) → Task, AddListener / RemoveListener(IBarcodeCountListener), Reset(), StartScanningPhase(), EndScanningPhase(), SetBarcodeCountCaptureList(BarcodeCountCaptureList), SetAdditionalBarcodes(IList<Barcode>), ClearAdditionalBarcodes(), event EventHandler<BarcodeCountEventArgs> Scanned, Dispose().
• BarcodeCountSettings — new BarcodeCountSettings(), EnableSymbology(Symbology, bool), EnableSymbologies(ICollection<Symbology>), GetSymbologySettings(Symbology), EnabledSymbologies (get), FilterSettings (get, BarcodeFilterSettings), ExpectsOnlyUniqueBarcodes (get/set), DisableModeWhenCaptureListCompleted (get/set), MappingEnabled (get/set), SetProperty/GetProperty/GetProperty<T>/TryGetProperty<T>, Dispose.
• IBarcodeCountListener — OnScan(BarcodeCount, BarcodeCountSession, IFrameData), OnObservationStarted(BarcodeCount), OnObservationStopped(BarcodeCount).
• BarcodeCountSession — RecognizedBarcodes (IList<Barcode>), AdditionalBarcodes (IList<Barcode>), FrameSequenceId (long), Reset(), GetSpatialMap() / GetSpatialMap(int rows, int cols) → BarcodeSpatialGrid?.
• BarcodeCountEventArgs — BarcodeCount, Session, FrameData.
• Coordinate2d — new Coordinate2d(int x, int y), X, Y.
• Capture list (receiving): BarcodeCountCaptureList.Create(IBarcodeCountCaptureListListener, IList<TargetBarcode>); TargetBarcode.Create(string data, int quantity) with Data / Quantity; IBarcodeCountCaptureListListener (OnObservationStarted, OnObservationStopped, OnCaptureListSessionUpdated, OnCaptureListCompleted); BarcodeCountCaptureListSession (CorrectBarcodes, WrongBarcodes, MissingBarcodes, AdditionalBarcodes, AcceptedBarcodes, RejectedBarcodes).
• Spatial map: BarcodeSpatialGrid (Rows(), Columns(), ElementAt(row, col), Row(i), Column(i), CoordinatesForElement(element)); BarcodeSpatialGridElement (MainBarcode, SubBarcode).
• BarcodeCountFeedback — new BarcodeCountFeedback() (silent), static DefaultFeedback, Success / Failure (Core.Common.Feedback.Feedback), Dispose.
• BarcodeCountView — static Create(Context, DataCaptureContext, BarcodeCount) / Create(Context, DataCaptureContext, BarcodeCount, BarcodeCountViewStyle); implicit conversion to Android.Views.View; Style (get); Listener (IBarcodeCountViewListener?); many ShouldShow toggles (ShouldShowListButton, ShouldShowExitButton, ShouldShowShutterButton, ShouldShowFloatingShutterButton, ShouldShowSingleScanButton, ShouldShowClearHighlightsButton, ShouldShowStatusModeButton, ShouldShowUserGuidanceView, ShouldShowHints, ShouldShowToolbar, ShouldShowScanAreaGuides, ShouldShowListProgressBar, ShouldShowTorchControl); ShouldDisableModeOnExitButtonTapped, TapToUncountEnabled, TorchControlPosition (Anchor); brush properties (RecognizedBrush, NotInListBrush, AcceptedBrush, RejectedBrush) and static default brushes; BarcodeNotInListActionSettings (get); customization text properties; EnableHardwareTrigger(int?), static HardwareTriggerSupported; SetToolbarSettings, ClearHighlights(), SetStatusProvider, SetBrushForRecognizedBarcode/NotInList/Accepted/Rejected; event ExitButtonTapped / ListButtonTapped / SingleScanButtonTapped; Dispose.
• BarcodeCountViewStyle enum — Icon, Dot.
• IBarcodeCountViewListener — brush-for callbacks (BrushForRecognizedBarcode, NotInList, Accepted, *Rejected) and tap callbacks (OnRecognizedBarcodeTapped, OnFilteredBarcodeTapped, OnRecognizedBarcodeNotInListTapped, OnAcceptedBarcodeTapped, OnRejectedBarcodeTapped, and Android-only OnCaptureListCompleted).
• Tap event args: ExitButtonTappedEventArgs, ListButtonTappedEventArgs, SingleScanButtonTappedEventArgs — each with View.
• BarcodeCountToolbarSettings — text/content-description strings for the audio/vibration/strap-mode/color-scheme toggles.
• BarcodeCountNotInListActionSettings (from barcodeCountView.BarcodeNotInListActionSettings) — Enabled, accept/reject/cancel button text + content descriptions, BarcodeAcceptedHint, BarcodeRejectedHint.
• Status mode: IBarcodeCountStatusProvider (OnStatusRequested(IList<TrackedBarcode>, IBarcodeCountStatusProviderCallback)), IBarcodeCountStatusProviderCallback (OnStatusReady(IBarcodeCountStatusResult)), BarcodeCountStatus enum (None, NotAvailable, Expired, Fragile, QualityCheck, LowStock, Wrong), BarcodeCountStatusItem.Create(TrackedBarcode, BarcodeCountStatus), IBarcodeCountStatusResult with factories BarcodeCountStatusResultSuccess.Create(...), BarcodeCountStatusResultError.Create(...), BarcodeCountStatusResultAbort.Create(...).
• TrackedBarcode (in Scandit.DataCapture.Barcode.Batch.Data) — Barcode, Identifier, Location. Used by IBarcodeCountViewListener, the status API, and the capture-list session.

Documented for other platforms but NOT on dotnet.android — do not use

• BarcodeCountMappingFlowSettings and the mapping-flow configuration class — not surfaced in the .NET binding. Mapping in .NET is limited to BarcodeCountSettings.MappingEnabled + BarcodeCountSession.GetSpatialMap().
• BarcodeCountSessionSnapshot — no .NET equivalent.
• HardwareTriggerEnabled is iOS-only; on Android use EnableHardwareTrigger(int? keyCode) + static HardwareTriggerSupported.