问题
Issue
- Biometric authentication iris and face-detection is not prompting with
biometricPrompt.authenticate(**crypto**, promptInfo)call.
Source reference:
- Securing data with BiometricPrompt (19 May 2019)
- One Biometric API Over all Android (30 October 2019)
- Biometrich API
Device used for testing:
- Samsung S8 (Android OS 9)
Steps of Authentication I'm following:
- val biometricPrompt = BiometricPrompt(...)
- val promptInfo = BiometricPrompt.PromptInfo.Builder()...
- biometricPrompt.authenticate(promptInfo) (PFA: option A, B)
and there is another authentication method which take cipher object to make sure
- biometricPrompt.authenticate(crypto, promptInfo). (PFA: option C)
Everything worked just as expected with new and older API device support. Until unless realize tested application for other biometric authentication option iris and using face detection.
If I follow
biometricPrompt.authenticate(promptInfo) then application simply display authentication option based on user preference which he has to choose from Device Setting -> Biometric preference. And perform authentication independently. (PFA: option A, B)
But if use
biometricPrompt.**authenticate**(crypto, promptInfo)then it displays only fingerprint authentication option ONLY. For other preference option iris and face-detection, it does not display anything onauthenticate(..)method call. (PFA: option C)
Question
- Why other Biometric authentication is not prompting with crypto object authentication.
回答1:
Some devices only have one form factor, some have many form factors. Which form factor your app ends up using isn't really up to you; it's up to the OEM implementation. As explained in this blog post, whether a form factor is Strong or Weak doesn't depend on your code -- the OEM decides. However, you can request that a device uses Strong authentication for your app by specifying a CryptoObject when you call authenticate().
What you are experiencing is that the OEMs of your devices decided to make Fingerprint the default for Strong biometrics. Therefore, when you pass in a CryptoObject to authenticate() those devices show the user the UI for Fingerprint.
来源：https://stackoverflow.com/questions/59090310/biometricprompt-iris-and-face-prompt-is-not-working-with-crypto-object-authentic