Cannot show 2 BiometricPrompts back-to-back with face unlock [157783075]

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Description

ph...@monzo.com

created issue #1

May 30, 2020 11:07AM

If you show 2 BiometricPrompts back-to-back on a Pixel 4 (which uses face unlock), the second prompt will be immediately dismissed. This does not happen on devices that use fingerprint, like a Pixel 2.

I've attached a sample project that reproduces the issue. You can configure the delay between the first prompt being dismissed and the second being shown - with a delay of 400ms the issue reliably reproduces, and with a delay of 600ms it does not.

Here's a video of the sample on a Pixel 4: https://i.imgur.com/4sCWOm0.mp4

Here's a video of the sample on a Pixel 2: https://i.imgur.com/5dDI4zO.mp4

I believe it's caused by this postDelayed, which has a 500ms delay for face unlock and runs after the second prompt has been shown when 2 are shown back-to-back.

Note that this is a bug in the framework, not in the androidx.biometric library, but there doesn't seems to be a relevant component for framework biometrics (and it should be possible to work around this in androidx).

BUILD INFO:

Device type: Pixel 4
OS version: 10
Biometric library version: 1.0.1

STEPS TO REPRODUCE:

Install the sample.
Perform face unlock with the default 0 delay between prompts.

EXPECTED RESULTS: Both prompts work correctly.

OBSERVED RESULTS: The second prompt is immediately dismissed.

NUMBER OF TIMES YOU WERE ABLE TO REPRODUCE: 3/3

BiometricPrompt.zip

325 KB

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cu...@google.com <cu...@google.com> Aug 17, 2020 08:47PM

Reassigned to cu...@google.com.

ap...@google.com <ap...@google.com> #2Sep 3, 2020 06:34PM

Project: platform/frameworks/support
Branch: androidx-main

commit c46d3e79b2ea8b839358f0215b0a432ef8fad7a2
Author: Clara Fok <clarafok@google.com>
Date: Fri Nov 04 15:23:25 2022

Convert androidx.activity.Cancellable to kotlin

Test: ./gradlew activity:activity:cC
Bug: 257291701
Change-Id: I057f3e54811e7399e40083ef5e3915adc4fa425d

M activity/activity/src/main/java/androidx/activity/Cancellable.kt

https://android-review.googlesource.com/2288554

cu...@google.com <cu...@google.com> #3Sep 3, 2020 09:29PM

Marked as fixed.

Project: platform/frameworks/support
Branch: androidx-main

commit 7fd8a3206a49baefee8340f0839fcd4de7716788
Author: Clara Fok <clarafok@google.com>
Date: Fri Nov 04 15:13:23 2022

Rename androidx.activity.Cancellable from .java to .kt

Test: n/a
Bug:257291701
Change-Id: I7f2ff8ce79af41c6437fb9a0f1be90e8990495e8

M activity/activity/src/main/java/androidx/activity/Cancellable.kt

https://android-review.googlesource.com/2288553

ap...@google.com <ap...@google.com> #4Sep 4, 2020 01:29AM

Project: platform/frameworks/support
Branch: androidx-main

commit 4d21e0a45f19ed238ef30756f576930af07449c2
Author: Clara Fok <clarafok@google.com>
Date: Fri Nov 04 13:25:08 2022

Convert ActivityResultCallback to kotlin

Including clean up in test usages of this interface

Test: ./gradlew activity:activity:cC
Bug: 257291701
Relnote: Converted ActvitiyResultCallback to kotlin. Maintains source and binary comptability.
Change-Id: Ifc5e5e1a9a7ed4e281007830fb8d4c74237c63ce

M activity/activity/api/current.txt
M activity/activity/api/public_plus_experimental_current.txt
M activity/activity/api/restricted_current.txt
M activity/activity/src/androidTest/java/androidx/activity/result/ActivityResultRegistryTest.kt
M activity/activity/src/main/java/androidx/activity/result/ActivityResultCallback.kt

https://android-review.googlesource.com/2288334

Issue 157783075

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Issue summary

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cu...@google.com <cu...@google.com> Aug 17, 2020 08:47PM

ap...@google.com <ap...@google.com> #2Sep 3, 2020 06:34PM

cu...@google.com <cu...@google.com> #3Sep 3, 2020 09:29PM

ap...@google.com <ap...@google.com> #4Sep 4, 2020 01:29AM

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