IssueTracker

I faced issue with not getting authentication results when multiple instances of BiometricPrompt created in a Single-Acticvity-Application.

Discovered reason:
When a new instance of BiometricPrompt is created, it adds a LifecycleObserver to the Activity and never removes it. So when you have multiple instances of BiometricPrompt in an Activity, there are multiple LifecycleObservers. The first only receives callbacks.

Similar issue, detailed explanation of the reason and  solution with  Reflection I have found here:
https://stackoverflow.com/questions/59598027/android-biometric-authentication-invalid-variables-in-authenticationcallback-whe

The solution with Reflection fixes my issue, however, I think it is not the best work around:
"You should remove LifecycleObserver from activity when you create a new instance of BiometricPrompt class. Since there is no direct access to the observer, you need use reflection here"

So, could you, please, fix it, or suggest me a better way to handle it?

BUILD INFO
- Device type: Samsung Galaxy S8 Edge, Samsung Galaxy S8, Emulator Pixel 2, Emulator Nexus 5
- OS version: Android Api level 28 and below
- Biometric library version: androidx.biometric:biometric:1.0.1

NUMBER OF TIMES YOU WERE ABLE TO REPRODUCE 10/10