QrCodeAnalyzer.kt

import androidx.annotation.OptIn
import androidx.camera.core.ExperimentalGetImage
import androidx.camera.core.ImageAnalysis
import androidx.camera.core.ImageProxy
import com.google.mlkit.vision.barcode.BarcodeScannerOptions
import com.google.mlkit.vision.barcode.BarcodeScanning
import com.google.mlkit.vision.barcode.common.Barcode
import com.google.mlkit.vision.common.InputImage

class QrCodeAnalyzer(
    private val onQrCodeScanned: (Barcode) -> Unit,
    private val onQrCodeScanFailed: (e:Exception) -> Unit
) : ImageAnalysis.Analyzer {

    @OptIn(ExperimentalGetImage::class)
    override fun analyze(imageProxy: ImageProxy) {
        val options = BarcodeScannerOptions.Builder()
            .setBarcodeFormats(Barcode.FORMAT_QR_CODE)
            .build()

        val scanner = BarcodeScanning.getClient(options)
        val mediaImage = imageProxy.image
        mediaImage?.let {
            val image = InputImage.fromMediaImage(mediaImage, imageProxy.imageInfo.rotationDegrees)

            scanner.process(image)
                .addOnSuccessListener { barcodes ->
                    if (barcodes.size > 0) {
                            onQrCodeScanned(barcodes.first())
                    }
                    imageProxy.close()
                }
                .addOnFailureListener { exception ->
                    // Task failed with an exception
                    onQrCodeScanFailed(exception)
                    exception.printStackTrace()
                }
        }
    }
}