AuthenticationCallback

Kotlin |Java

abstract class AuthenticationCallback

kotlin.Any
↳	android.hardware.biometrics.BiometricPrompt.AuthenticationCallback

Callback structure provided to BiometricPrompt#authenticate(CancellationSignal, or BiometricPrompt#authenticate(CryptoObject,. Users must provide an implementation of this for listening to authentication events.

Summary

Public constructors
`AuthenticationCallback()`

Public methods
open Unit	`onAuthenticationError(errorCode: Int, errString: CharSequence!)` Called when an unrecoverable error has been encountered and the operation is complete.
open Unit	`onAuthenticationFailed()` Called when a biometric is valid but not recognized.
open Unit	`onAuthenticationHelp(helpCode: Int, helpString: CharSequence!)` Called when a recoverable error has been encountered during authentication.
open Unit	`onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult!)` Called when a biometric is recognized.

Public constructors

AuthenticationCallback

AuthenticationCallback()

Public methods

onAuthenticationError

Added in API level 28

open fun onAuthenticationError(
    errorCode: Int, 
    errString: CharSequence!
): Unit

Called when an unrecoverable error has been encountered and the operation is complete. No further actions will be made on this object.

Parameters
`errorCode`	Int: An integer identifying the error message
`errString`	CharSequence!: A human-readable error string that can be shown on an UI

onAuthenticationFailed

Added in API level 28

open fun onAuthenticationFailed(): Unit

Called when a biometric is valid but not recognized.

onAuthenticationHelp

Added in API level 28

open fun onAuthenticationHelp(
    helpCode: Int, 
    helpString: CharSequence!
): Unit

Called when a recoverable error has been encountered during authentication. The help string is provided to give the user guidance for what went wrong, such as "Sensor dirty, please clean it."

Parameters
`helpCode`	Int: An integer identifying the error message
`helpString`	CharSequence!: A human-readable string that can be shown on an UI

onAuthenticationSucceeded

Added in API level 28

open fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult!): Unit

Called when a biometric is recognized.

Parameters
`result`	BiometricPrompt.AuthenticationResult!: An object containing authentication-related data