Fingerprint AuthenticationCallback description

AuthenticationCallback.kt

override fun onAuthenticationError(errorCode: Int, errString: CharSequence?) {
    //scanning completed with unknown error
}

override fun onAuthenticationSucceeded(result: FingerprintManager.AuthenticationResult?) {
    //scanning was successful and has match with one of registered on the device fingerprints
}

override fun onAuthenticationHelp(helpCode: Int, helpString: CharSequence?) {
    //case when scanning was failed because of known reason (limit of scan attempts or dirt on the scanner's sensor).
    //helpString contains a hint for the user to let him know what happened
}

override fun onAuthenticationFailed() {
    //scanning was successful but it's result doesn't match with any of registered fingerprints
}