AuthenticatorActivity.kt

// Ask for permission to use the fingerprint scanner
if (fingerprintManager.isHardwareDetected) {
    if (checkSelfPermission(Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {
        if (checkedPermissions) {
            hasPermissions = false
        } else {
            requestPermissions(arrayOf(Manifest.permission.USE_FINGERPRINT), REQUEST_PERMISSIONS_FINGERPRINT)
        }
    } else {
        hasPermissions = true
    }
}