Camera not working on surfaceView once permission is given - kotlin

Question

class ScanScopeFragment : Fragment() {
private val TAG: String = "ScanScopeFragment"
private lateinit var binding: FragmentScanScopeBinding
private lateinit var mainContext: Context
private lateinit var mainActivity: Activity
private lateinit var surfaceView: SurfaceView
private val REQUEST_CAMERA_PERMISSION = 201
//private val requestCodeCameraPermission = 1001
private lateinit var cameraSource: CameraSource
private lateinit var barcodeDetector: BarcodeDetector
private lateinit var barcodeText: TextView
private var scannedValue = ""
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View {
binding = FragmentScanScopeBinding.inflate(inflater, container, false)
mainContext = requireContext()
mainActivity = requireActivity()
surfaceView = binding.cameraSurfaceView
barcodeText = binding.barcodeText
initialiseDetectorsAndSources()
return binding.root
}
private fun initialiseDetectorsAndSources() {
//Toast.makeText(getApplicationContext(), "Barcode scanner started", Toast.LENGTH_SHORT).show();
barcodeDetector = BarcodeDetector.Builder(mainContext)
.setBarcodeFormats(Barcode.ALL_FORMATS)
.build()
cameraSource = CameraSource.Builder(mainContext, barcodeDetector)
.setRequestedPreviewSize(1920, 1080)
.setAutoFocusEnabled(true) //you should add this feature
.build()
surfaceView.getHolder().addCallback(object : SurfaceHolder.Callback {
override fun surfaceCreated(holder: SurfaceHolder) {
try {
if (ActivityCompat.checkSelfPermission(
mainContext,
Manifest.permission.CAMERA
) == PackageManager.PERMISSION_GRANTED
) {
cameraSource.start(surfaceView.getHolder())
} else {
ActivityCompat.requestPermissions(
mainActivity,
arrayOf(Manifest.permission.CAMERA),
REQUEST_CAMERA_PERMISSION
)
}
} catch (e: IOException) {
e.printStackTrace()
}
}
override fun surfaceChanged(
holder: SurfaceHolder,
format: Int,
width: Int,
height: Int
) {
}
override fun surfaceDestroyed(holder: SurfaceHolder) {
cameraSource.stop()
}
})
barcodeDetector.setProcessor(object : Detector.Processor<Barcode> {
override fun release() {
// Toast.makeText(getApplicationContext(), "To prevent memory leaks barcode scanner has been stopped", Toast.LENGTH_SHORT).show();
}
override fun receiveDetections(detections: Detector.Detections<Barcode>) {
val barcodes = detections.detectedItems
if (barcodes.size() != 0) {
barcodeText.post(Runnable {
scannedValue = barcodes.valueAt(0).displayValue
barcodeText.setText(scannedValue)
})
}
}
})
}
/*
override fun onRequestPermissionsResult(
requestCode: Int,
permissions: Array,
grantResults: IntArray
) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
if (requestCode == REQUEST_CAMERA_PERMISSION && grantResults.isNotEmpty()) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
initialiseDetectorsAndSources()
} else {
// Toast.makeText(applicationContext, "Permission Denied", Toast.LENGTH_SHORT).show()
}
}
}
*/
override fun onPause() {
super.onPause()
cameraSource.release()
}
override fun onResume() {
super.onResume()
initialiseDetectorsAndSources()
}
}
I am hoping once the permission is given the camera will open on the surfaceView