NullPointerException: Attempt to invoke virtual method 'long SecuGen.Driver.SmartCapture3Fdu05.Start(int, boolean)' on a null object reference

Question

I developed an application for **android **where i am getting Finger Print using **SecuGen **Pro 20 device. Samsung device capture the finger print image. But other device can not capture image (such as: One plus, Redmi, Xiaomi, Techno etc. device)

Initialization part into onCreate() section

//  fingerPrintEnable()
    mPermissionIntent = PendingIntent.getBroadcast(
        requireContext(),
        0,
        Intent(Const.ACTION_USB_PERMISSION),
        PendingIntent.FLAG_IMMUTABLE
    )
    filter = IntentFilter(Const.ACTION_USB_PERMISSION)
    // registerReceiver(usbReceiver, filter)
    jsgfpLib = JSGFPLib(requireContext().getSystemService(Context.USB_SERVICE) as UsbManager)
    bSecuGenDeviceOpened = false
    usbPermissionRequested = false
    autoOn = SGAutoOnEventNotifier(jsgfpLib, this)

Image capture code

mRegisterImage = ByteArray(mImageWidth * mImageHeight)
        var result = jsgfpLib.GetImage(mRegisterImage)
        result = jsgfpLib.GetMaxTemplateSize(mMaxTemplateSize)
        minBuffer = ByteArray(mMaxTemplateSize[0])
        jsgfpLib.SetTemplateFormat(SGFDxTemplateFormat.TEMPLATE_FORMAT_ANSI378)
        jsgfpLib.GetImageQuality(
            mImageWidth.toLong(),
            mImageHeight.toLong(),
            mRegisterImage,
            quality1
        )
        var fpInfo: SGFingerInfo? = SGFingerInfo()
        fpInfo?.FingerNumber = 1
        fpInfo?.ImageQuality = quality1[0]
        fpInfo?.ImpressionType = SGImpressionType.SG_IMPTYPE_LP
        fpInfo?.ViewNumber = 1
        jsgfpLib.CreateTemplate(fpInfo, mRegisterImage, minBuffer)
        val size = IntArray(1)
        jsgfpLib.GetTemplateSize(minBuffer, size)
        imgViewCapture.setImageBitmap(this.toGrayscale(mRegisterImage!!))

USB Permission Code

private val usbReceiver: BroadcastReceiver = object : BroadcastReceiver() {
    override fun onReceive(context: Context?, intent: Intent?) {
        val action = intent?.action
        if (Const.ACTION_USB_PERMISSION == action) {
            synchronized(this) {
                val device: UsbDevice? = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE)
                if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
                    if (device != null) {
                        Log.e("USB BroadcastReceiver VID", "" + device.vendorId)
                        Log.e("USB BroadcastReceiver VID", "" + device.productId)
                    } else {
                        Log.e("TAG", "mUsbReceiver.onReceive() Device is null")
                    }
                } else
                    Log.e(
                        "TAG",
                        "mUsbReceiver.onReceive() permission denied for device $device"
                    )
            }
        }
    }

SecuGen permission

var errorValue = jsgfpLib.Init(SGFDxDeviceName.SG_DEV_AUTO)
    if (errorValue != SGFDxErrorCode.SGFDX_ERROR_NONE) {
        if (secuGenDialog == 1) {
            val dlgAlert = AlertDialog.Builder(requireContext())
            if (errorValue == SGFDxErrorCode.SGFDX_ERROR_DEVICE_NOT_FOUND) {
                dlgAlert.setMessage("The attached fingerprint device is not supported on Android")
            } else {

                fingerPageVisibilityGone()
                dlgAlert.setMessage("Fingerprint device initialization failed!")
            }
            dlgAlert.setTitle("SecuGen Fingerprint SDK")
            dlgAlert.setPositiveButton(android.R.string.ok) { dialog, _ ->
                dialog.dismiss()
            }
            dlgAlert.setCancelable(false)
            // dlgAlert.setPositiveButton(R.string.ok) { _: DialogInterface?, _: Int -> requireActivity().finish() }
            dlgAlert.create().show()
        }
    } else {
        val usbDevice = jsgfpLib.GetUsbDevice()
        if (usbDevice == null) {
            if (secuGenDialog == 1) {
                fingerPageVisibilityGone()
                val dlgAlert = AlertDialog.Builder(requireContext())
                dlgAlert.setMessage("SecuGen fingerprint sensor not found!")
                dlgAlert.setTitle("SecuGen Fingerprint SDK")
                dlgAlert.setPositiveButton(android.R.string.ok) { dialog, _ ->
                    dialog.dismiss()
                }
                dlgAlert.setCancelable(false)
                dlgAlert.create().show()
            }
        } else {
           
            var hasPermission = jsgfpLib.GetUsbManager().hasPermission(usbDevice)
            if (!hasPermission) {
                if (!usbPermissionRequested) {
                    usbPermissionRequested = true
                    jsgfpLib.GetUsbManager().requestPermission(usbDevice, mPermissionIntent)
                } else {
                    //wait up to 20 seconds for the system to grant USB permission

                    hasPermission = jsgfpLib.GetUsbManager().hasPermission(usbDevice)
                    var i = 0
                    while (!hasPermission && i <= 40) {
                        ++i
                        hasPermission = jsgfpLib.GetUsbManager().hasPermission(usbDevice)
                        try {
                            Thread.sleep(500)
                        } catch (e: InterruptedException) {
                            e.printStackTrace()
                        }
                    }
                }
            }
            if (hasPermission) {
                errorValue = jsgfpLib.OpenDevice(0)
                if (errorValue == SGFDxErrorCode.SGFDX_ERROR_NONE) {
                    bSecuGenDeviceOpened = true
                    val deviceInfo = SGDeviceInfoParam()
                    jsgfpLib.GetDeviceInfo(deviceInfo)
                    mImageWidth = deviceInfo.imageWidth
                    mImageHeight = deviceInfo.imageHeight
                    mImageDPI = deviceInfo.imageDPI
                    jsgfpLib.SetTemplateFormat(SGFDxTemplateFormat.TEMPLATE_FORMAT_ANSI378)
                    jsgfpLib.GetMaxTemplateSize(mMaxTemplateSize)
                    
                    autoOn.start()
                }
            }
        }
    }

But I am getting crash from other device Like Realme, mi, Techno, Oneplus etc. Crash occur and give me a message Null Pointer Exception.

java.lang.NullPointerException: Attempt to invoke virtual method 'long SecuGen.Driver.SmartCapture3Fdu05.Start(int, boolean)' on a null object reference

I attach an image of my code. I am getting crash in the result line.

I do not find any solution.

Please help me. [enter image description here][1]

I tried the given image code. But it's return null and app is crash. I setup the SDK properly. But for few device (such as: Oneplus, Realme, mi, Techno, etc) i am getting the null.

I need the suggestion where is code error. How can i solve this problem .