just_scanner 0.0.1

High-performance QR and barcode scanner for Flutter with support for multiple formats and lower Android versions.

Changelog

0.0.1 - 2026-02-20

Platform Support

• Android support (API 21+) using CameraX (1.3.1) + ML Kit Barcode Scanning (17.2.0) with ZXing (3.5.2) fallback
• iOS support (iOS 11.0+) using AVFoundation + Vision framework
• Legacy camera API mode for older Android devices (API < 21)

Barcode Format Support

• Support for 13+ barcode formats:
  • 2D formats: QR Code, Aztec, Data Matrix, PDF417
  • 1D formats: UPC-A, UPC-E, EAN-8, EAN-13, Code 39, Code 93, Code 128, ITF, Codabar

Scanning Features

• Real-time barcode scanning with stream-based results
• Start and stop scanning commands
• Torch/flashlight toggle control
• Continuous scanning mode
• Single-shot scanning mode
• Configurable scan delay to prevent duplicate detections
• Image analysis from bytes (analyzeImage() method for scanning existing images)

Data & Detection

• Barcode position data with bounding box coordinates
• Corner points detection (4-point coordinates)
• Timestamp for each scan result
• Format identification for detected barcodes

Configuration Options

• Performance Modes:
  • High Performance mode (30-60 FPS with ML Kit/Vision)
  • Battery Saver mode (15-24 FPS with reduced processing)
• Customizable Settings:
  • Configurable frame rate (15-60 FPS)
  • Haptic feedback on successful scan
  • Optional beep sound on scan
  • Auto flash capability
  • Scan area overlay toggle
  • Adjustable scan delay (milliseconds)

UI Components

• ScannerView widget with texture-based camera preview
• Customizable scan area overlay
• Custom overlay widget support
• Resolution presets (high, medium, low)

APIs & Methods

• Permission management:
  • checkPermission() - Check camera permission status
  • requestPermission() - Request camera permission
• Scanning control:
  • startScan() - Start scanning
  • stopScan() - Stop scanning
  • toggleFlash() - Toggle torch/flashlight
• Image analysis:
  • analyzeImage(List<int> imageBytes) - Scan barcodes from image data
• Resource management:
  • dispose() - Clean up resources

Performance Optimizations

• Background thread processing for scanning
• Backpressure handling strategy (STRATEGY_KEEP_ONLY_LATEST)
• Format-specific scanning optimization
• Hardware acceleration support
• Event channel for real-time scan stream