BiometricManager

BIOMETRIC_ERROR_HW_UNAVAILABLE

public static final int BIOMETRIC_ERROR_HW_UNAVAILABLE

The hardware is unavailable. Try again later.

Constant Value: 1 (0x00000001)

BIOMETRIC_ERROR_NONE_ENROLLED

public static final int BIOMETRIC_ERROR_NONE_ENROLLED

The user does not have any biometrics enrolled.

Constant Value: 11 (0x0000000b)

BIOMETRIC_ERROR_NO_HARDWARE

public static final int BIOMETRIC_ERROR_NO_HARDWARE

There is no biometric hardware.

Constant Value: 12 (0x0000000c)

BIOMETRIC_ERROR_SECURITY_UPDATE_REQUIRED

public static final int BIOMETRIC_ERROR_SECURITY_UPDATE_REQUIRED

A security vulnerability has been discovered and the sensor is unavailable until a security update has addressed this issue. This error can be received if for example, authentication was requested with Authenticators.BIOMETRIC_STRONG, but the sensor's strength can currently only meet Authenticators.BIOMETRIC_WEAK.

Constant Value: 15 (0x0000000f)

BIOMETRIC_NO_AUTHENTICATION

public static final long BIOMETRIC_NO_AUTHENTICATION

Returned from BiometricManager.getLastAuthenticationTime(int) when no matching successful authentication has been performed since boot.

Constant Value: -1 (0xffffffffffffffff)

BIOMETRIC_SUCCESS

public static final int BIOMETRIC_SUCCESS

No error detected.

Constant Value: 0 (0x00000000)

canAuthenticate

public int canAuthenticate ()

This method was deprecated in API level 30.
See canAuthenticate(int).

Determine if biometrics can be used. In other words, determine if BiometricPrompt can be expected to be shown (hardware available, templates enrolled, user-enabled). This is the equivalent of canAuthenticate(int) with Authenticators.BIOMETRIC_WEAK
Requires Manifest.permission.USE_BIOMETRIC

canAuthenticate

public int canAuthenticate (int authenticators)

Determine if any of the provided authenticators can be used. In other words, determine if BiometricPrompt can be expected to be shown (hardware available, templates enrolled, user-enabled). For biometric authenticators, determine if the device can currently authenticate with at least the requested strength. For example, invoking this API with Authenticators.BIOMETRIC_WEAK on a device that currently only has Authenticators.BIOMETRIC_STRONG enrolled will return BIOMETRIC_SUCCESS. Invoking this API with Authenticators.DEVICE_CREDENTIAL can be used to determine if the user has a PIN/Pattern/Password set up.
Requires Manifest.permission.USE_BIOMETRIC

getLastAuthenticationTime

public long getLastAuthenticationTime (int authenticators)

Gets the last time the user successfully authenticated using one of the given authenticators. The returned value is time in SystemClock.elapsedRealtime() (time since boot, including sleep).

BiometricManager.BIOMETRIC_NO_AUTHENTICATION is returned in the case where there has been no successful authentication using any of the given authenticators since boot.

Currently, only Authenticators.DEVICE_CREDENTIAL and Authenticators.BIOMETRIC_STRONG are accepted. IllegalArgumentException will be thrown if authenticators contains other authenticator types.

Note that this may return successful authentication times even if the device is currently locked. You may use KeyguardManager.isDeviceLocked() to determine if the device is unlocked or not. Additionally, this method may return valid times for an authentication method that is no longer available. For instance, if the user unlocked the device with a Authenticators.BIOMETRIC_STRONG authenticator but then deleted that authenticator (e.g., fingerprint data), this method will still return the time of that unlock for Authenticators.BIOMETRIC_STRONG if it is the most recent successful event. The caveat is that BiometricManager.BIOMETRIC_NO_AUTHENTICATION will be returned if the device no longer has a secure lock screen at all, even if there were successful authentications performed before the lock screen was made insecure.
Requires Manifest.permission.USE_BIOMETRIC
Value is a non-negative timestamp in the SystemClock.elapsedRealtime() time base.

getStrings

public BiometricManager.Strings getStrings (int authenticators)

Produces an instance of the Strings class, which provides localized strings for an application, given a set of allowed authenticator types.
Requires Manifest.permission.USE_BIOMETRIC