QRCodeWIFIAnalyzer.kt

class QRCodeWIFIAnalyzer(
    private val onSuccess: (ssid: String, password: String) -> Unit,
    private val onFailure: (e: Exception) -> Unit
)  : ImageAnalysis.Analyzer {

   private val scanner: BarcodeScanner = BarcodeScanning.getClient(BarcodeScannerOptions.Builder().setBarcodeFormats(Barcode.FORMAT_QR_CODE).build())

    @SuppressLint("UnsafeOptInUsageError")
    override fun analyze(imageProxy: ImageProxy) {
        val mediaImage = imageProxy.image
        if (mediaImage != null){
            val image = InputImage.fromMediaImage(mediaImage, imageProxy.imageInfo.rotationDegrees)

            scanner.process(image)
                .addOnSuccessListener {barcodes->
                    for (barcode in barcodes){
                        val valueType = barcode.valueType
                        if(valueType == Barcode.TYPE_WIFI){
                            val ssid = barcode.wifi!!.ssid
                            val password = barcode.wifi!!.password
                            if(ssid !=null && password!= null){
                                onSuccess(ssid, password)
                            }else{
                                onFailure(NullPointerException("WIFI credentials must not be null"))
                            }
                        }else{
                            onFailure(IllegalArgumentException("Barcode is not resembling a WIFI network"))
                        }
                    }
                }
                .addOnFailureListener{
                    onFailure(it)
                }
                .addOnCompleteListener {
                    imageProxy.close()
                }

        }
    }
}