81.1 An Overview of Biometric Authentication

The key biometric authentication component is the BiometricPrompt class. This class performs much of the work that previously had to be performed by writing code in earlier Android versions, including displaying a standard dialog to guide the user through the authentication process, performing the authentication and reporting the results to the app. The class also handles excessive failed authentication attempts and enforces a timeout before the user can try again.

The BiometricPrompt class includes a companion Builder class that can be used to configure and create BiometricPrompt instances, including defining the text that is to appear within the biometric authentication dialog and the customization of the cancel button (also referred to as the negative button) that appears in the dialog.

The BiometricPrompt instance is also assigned a set of authentication callbacks that will be called to provide the app with the results of an authentication...