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BiometricManager.Authenticators Types of authenticators, defined at a level of granularity supported by BiometricManager and BiometricPrompt.

BiometricManager	A class that contains biometric utilities.
BiometricPrompt	A class that manages a system-provided biometric dialog.
BiometricPrompt.AuthenticationCallback	Callback structure provided to `BiometricPrompt#authenticate(CancellationSignal, Executor, AuthenticationCallback)` or `BiometricPrompt#authenticate(CryptoObject, CancellationSignal, Executor, AuthenticationCallback)`.
BiometricPrompt.AuthenticationResult	Container for callback data from `BiometricPrompt.authenticate(android.os.CancellationSignal, java.util.concurrent.Executor, android.hardware.biometrics.BiometricPrompt.AuthenticationCallback)` and `BiometricPrompt.authenticate(android.hardware.biometrics.BiometricPrompt.CryptoObject, android.os.CancellationSignal, java.util.concurrent.Executor, android.hardware.biometrics.BiometricPrompt.AuthenticationCallback)`.
BiometricPrompt.Builder	A builder that collects arguments to be shown on the system-provided biometric dialog.
BiometricPrompt.CryptoObject	A wrapper class for the cryptographic operations supported by BiometricPrompt.