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CodeName OneShai Almog4 min readintermediate

CodeScanner.scan(): Barcode Scanning Without Rebuilding the Camera Pipeline

Read on codenameone.com

Summary

CodeScanner.scan() and VisionCameraView provide high‑level, async‑first APIs that hide the camera plumbing in Codename One, letting apps scan barcodes or run vision analyzers (faces, pose, segmentation) with a single call and without rebuilding native pipelines.

  • One‑call API (`CodeScanner.scan`) opens a scanner form, returns the first accepted barcode via an `AsyncResource`, and restores the previous UI on cancel or error.
  • `VisionCameraView<T>` embeds a live camera preview in a form, keeps only the newest frame for analysis, delivers typed results on the EDT, and releases resources on form hide/close.
  • Analyzers (e.g., `FaceDetector`, `SelfieSegmenter`) are supplied by the caller, keeping native dependencies minimal and allowing build‑time pruning of unused vision models.
  • Results are typed (`BarcodeFormat`, `Face[]`, `PoseLandmarks`) and include geometry helpers to map normalized coordinates to pixel bounds for UI overlay.

By abstracting the camera lifecycle and vision pipeline into reusable components, developers can add common scanning or detection features with far less code and fewer platform‑specific bugs, while still retaining the ability to drop in custom native models when needed.

6/10
mobilevisioncamerabarcodeface detection

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