FingerprintManagerCompat

Kotlin |Java

class FingerprintManagerCompat

kotlin.Any
↳	androidx.core.hardware.fingerprint.FingerprintManagerCompat

A class that coordinates access to the fingerprint hardware.

On platforms before android.os.Build.VERSION_CODES#M, this class behaves as there would be no fingerprint hardware available.

Summary

Nested classes
abstract	AuthenticationCallback Callback structure provided to FingerprintManagerCompat#authenticate(CryptoObject, * int, CancellationSignal, AuthenticationCallback, Handler).
	AuthenticationResult Container for callback data from FingerprintManagerCompat#authenticate(CryptoObject, * int, CancellationSignal, AuthenticationCallback, Handler).
	CryptoObject A wrapper class for the crypto objects supported by FingerprintManager.

Public methods
Unit	authenticate(@Nullable crypto: FingerprintManagerCompat.CryptoObject?, flags: Int, @Nullable cancel: CancellationSignal?, @NonNull callback: FingerprintManagerCompat.AuthenticationCallback, @Nullable handler: Handler?) Request authentication of a crypto object.
static FingerprintManagerCompat	from(@NonNull context: Context) Get a FingerprintManagerCompat instance for a provided context.
Boolean	hasEnrolledFingerprints() Determine if there is at least one fingerprint enrolled.
Boolean	isHardwareDetected() Determine if fingerprint hardware is present and functional.

Public methods

authenticate

fun authenticate(
    @Nullable crypto: FingerprintManagerCompat.CryptoObject?, 
    flags: Int, 
    @Nullable cancel: CancellationSignal?, 
    @NonNull callback: FingerprintManagerCompat.AuthenticationCallback, 
    @Nullable handler: Handler?
): Unit

Request authentication of a crypto object. This call warms up the fingerprint hardware and starts scanning for a fingerprint. It terminates when AuthenticationCallback#onAuthenticationError(int, CharSequence) or AuthenticationCallback#onAuthenticationSucceeded(AuthenticationResult) is called, at which point the object is no longer valid. The operation can be canceled by using the provided cancel object.

Parameters
crypto	FingerprintManagerCompat.CryptoObject?: object associated with the call or null if none required.
flags	Int: optional flags; should be 0
cancel	CancellationSignal?: an object that can be used to cancel authentication
callback	FingerprintManagerCompat.AuthenticationCallback: an object to receive authentication events
handler	Handler?: an optional handler for events

from

@NonNull static fun from(@NonNull context: Context): FingerprintManagerCompat

Get a FingerprintManagerCompat instance for a provided context.

hasEnrolledFingerprints

fun hasEnrolledFingerprints(): Boolean

Determine if there is at least one fingerprint enrolled.

Return
Boolean: true if at least one fingerprint is enrolled, false otherwise

isHardwareDetected

fun isHardwareDetected(): Boolean

Determine if fingerprint hardware is present and functional.

Return
Boolean: true if hardware is present and functional, false otherwise.