Jetpack Compose example usage of the new ImageAnalysis MlKitAnalyzer (https://android-developers.googleblog.com/2022/08/camerax-12-is-now-in-beta.html)

CameraPreview.kt

@Composable
fun CameraPreview(
    modifier: Modifier = Modifier,
    cameraSelector: CameraSelector = CameraSelector.DEFAULT_BACK_CAMERA,
    scaleType: PreviewView.ScaleType = PreviewView.ScaleType.FILL_CENTER,
    onBarCodesFound: (barCodes: List<Barcode>) -> Boolean,
) {
    val lifecycleOwner = LocalLifecycleOwner.current
    val context = LocalContext.current

   var barcodeScanner = remember<BarcodeScanner?> { null }

    AndroidView(
        modifier = modifier,
        factory = {
            val previewView = PreviewView(context).apply {
                this.scaleType = scaleType
                layoutParams = ViewGroup.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.MATCH_PARENT
                )
                // Preview is incorrectly scaled in Compose on some devices without this
                implementationMode = PreviewView.ImplementationMode.COMPATIBLE
            }

            val cameraController = LifecycleCameraController(context)
            cameraController.bindToLifecycle(lifecycleOwner)
            cameraController.cameraSelector = cameraSelector
            previewView.controller = cameraController

            val options = BarcodeScannerOptions.Builder()
                .setBarcodeFormats(Barcode.FORMAT_QR_CODE)
                .build()

            barcodeScanner?.close()
            barcodeScanner = BarcodeScanning.getClient(options)

            cameraController.clearImageAnalysisAnalyzer()
            val scanner = barcodeScanner!!
            val executor = ContextCompat.getMainExecutor(context)
            val analyzer = MlKitAnalyzer(
                listOf(scanner),
                COORDINATE_SYSTEM_VIEW_REFERENCED,
                executor
            ) { result ->
                val barcodes = result.getValue(scanner)
                if (barcodes != null && barcodes.size > 0) {
                    onBarCodesFound(barcodes)
                }
            }
            cameraController.setImageAnalysisAnalyzer(executor, analyzer)

            previewView
        }
    )
}