IssueTracker

In 1.0.0-alpha04 the FingerprintDialogFragment, on authentication error, will call dismiss() in a postDelayed with a delay of 500 ms. If the application's activity is closed before this delay is up the following error will occur:

java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
        at androidx.fragment.app.FragmentManagerImpl.checkStateLoss(FragmentManagerImpl.java:1534)
        at androidx.fragment.app.FragmentManagerImpl.enqueueAction(FragmentManagerImpl.java:1556)
        at androidx.fragment.app.BackStackRecord.commitInternal(BackStackRecord.java:591)
        at androidx.fragment.app.BackStackRecord.commit(BackStackRecord.java:543)
        at androidx.fragment.app.DialogFragment.dismissInternal(DialogFragment.java:250)
        at androidx.fragment.app.DialogFragment.dismiss(DialogFragment.java:202)
        at androidx.biometric.FingerprintDialogFragment$2.run(FingerprintDialogFragment.java:360)
        at android.os.Handler.handleCallback(Handler.java:789)
        at android.os.Handler.dispatchMessage(Handler.java:98)
        at android.os.Looper.loop(Looper.java:180)
        at android.app.ActivityThread.main(ActivityThread.java:6950)
        at java.lang.reflect.Method.invoke(Method.java:-2)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:835)

I would argue that the library should be using the method dismissAllowingStateLoss to dismiss it's dialog because:
1) There is no way for the library implementers to stop this from crashing, even if they call cancelAuthentication() on the biometrics prompt onPause() this error will still happen
2) There is no actual state in the biometrics library that needs to be saved
3) Since this is dismissed with a delay there is no way to guarantee the activity will always be in a good state when it's cleaned up. If the activity gets stopped between the error and the postDelayed there will be a crash
4) A common use case for biometrics is to prevent a user from using the app until they have passed the prompt. This means they will want to have a generic place to launch the biometrics prompt making it very hard to guarantee it's always safe to dismiss the dialog

It's tricky to reproduce so I didn't provide a sample project but it is crashing in our production app. I can probably create one if you still think it's necessary

BUILD INFO
- Device type: SM-G570M, SM-G930F, SM-G930U, ASUS_X00DDB, CPH1819, HTC U11, LG-Q710AL, SM-C710F, SM-C710F, SNE-LX1
- OS version: 8.0.0 and 8.1.0
- Biometric library version: 1.0.0-alpha04

STEPS TO REPRODUCE
If the activity has had onStop called on it before the postDelayed is triggered it will throw an IllegalStateException.

EXPECTED RESULTS
No crash should occur in the library

OBSERVED RESULTS
A crash occurs

NUMBER OF TIMES YOU WERE ABLE TO REPRODUCE
I haven't reproduced it myself but it seems to be pretty regularly occurring in our production app.