BiometricManager

public static final int BIOMETRIC_ERROR_HW_UNAVAILABLE = 1

The user can't authenticate because the hardware is unavailable. Try again later.

public static final int BIOMETRIC_ERROR_NONE_ENROLLED = 11

The user can't authenticate because no biometric or device credential is enrolled.

public static final int BIOMETRIC_ERROR_NO_HARDWARE = 12

The user can't authenticate because there is no suitable hardware (e.g. no biometric sensor or no keyguard).

public static final int BIOMETRIC_ERROR_SECURITY_UPDATE_REQUIRED = 15

The user can't authenticate because a security vulnerability has been discovered with one or more hardware sensors. The affected sensor(s) are unavailable until a security update has addressed the issue.

public static final int BIOMETRIC_ERROR_UNSUPPORTED = -2

The user can't authenticate because the specified options are incompatible with the current Android version.

public static final int BIOMETRIC_STATUS_UNKNOWN = -1

Unable to determine whether the user can authenticate.

This status code may be returned on older Android versions due to partial incompatibility with a newer API. Applications that wish to enable biometric authentication on affected devices may still call BiometricPrompt#authenticate() after receiving this status code but should be prepared to handle possible errors.

public static final int BIOMETRIC_SUCCESS = 0

The user can successfully authenticate.

public int canAuthenticate()

Checks if the user can authenticate with biometrics. This requires at least one biometric sensor to be present, enrolled, and available on the device.

public int canAuthenticate(int authenticators)

Checks if the user can authenticate with an authenticator that meets the given requirements. This requires at least one of the specified authenticators to be present, enrolled, and available on the device.

Note that not all combinations of authenticator types are supported prior to Android 11 (API 30). Specifically, DEVICE_CREDENTIAL alone is unsupported prior to API 30, and BIOMETRIC_STRONG | DEVICE_CREDENTIAL is unsupported on API 28-29. Developers that wish to check for the presence of a PIN, pattern, or password on these versions should instead use isDeviceSecure.

public static @NonNull BiometricManager from(@NonNull Context context)

Creates a BiometricManager instance from the given context.

@RequiresPermission(value = Manifest.permission.USE_BIOMETRIC)
public @Nullable 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.