errString: CharSequence) { } override fun onAuthenticationHelp(helpCode: Int, helpString: CharSequence) { } override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) { } override fun onAuthenticationFailed() { object : FingerprintManager.AuthenticationCallback() { override fun onAuthenticationError(errorCode: Int, errString: CharSequence?) { } override fun onAuthenticationHelp(helpCode: Int, helpString: CharSequence?) { } override fun onAuthenticationSucceeded(result: FingerprintManager.AuthenticationResult?) { } override fun onAuthenticationFailed() { } } Fingerprint Manager