PermissionFragment for cameraX sample

PermissionFragment.kt

class PermissionFragment : Fragment() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        if (!hasPermissions(requireContext())) {
            requestPermissions( REQUIRED_PERMISSIONS, REQUEST_CODE_PERMISSIONS )
        } else {
            findNavController().popBackStack()
        }
    }

    override fun onRequestPermissionsResult(
        requestCode: Int, permissions: Array<String>, grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if (requestCode == REQUEST_CODE_PERMISSIONS) {
            val totalGranted = grantResults.count { PackageManager.PERMISSION_GRANTED == it }
            if (totalGranted == grantResults.size) {
                findNavController().popBackStack()
            } else {
                toast("Permission request denied")
                requestPermissions( REQUIRED_PERMISSIONS, REQUEST_CODE_PERMISSIONS )
            }
        }
    }

    companion object {
        private const val REQUEST_CODE_PERMISSIONS = 101

        private val REQUIRED_PERMISSIONS = arrayOf(
            Manifest.permission.CAMERA,
            Manifest.permission.RECORD_AUDIO,
            Manifest.permission.WRITE_EXTERNAL_STORAGE
        )

        fun hasPermissions(context: Context) = REQUIRED_PERMISSIONS.all {
            ContextCompat.checkSelfPermission(context, it) == PackageManager.PERMISSION_GRANTED
        }
    }
}