IssueTracker

We probably should make this work without a new API, otherwise developers would need to provide these flags, which is hard and complicated and entirely what the library should aim to simplify

For the support version of the library, we can probably make outside touches not dismiss the dialog.

We can have either
1) back button (existing)
2) potentially add a new "cancel" button

I'm unable to reproduce this issue on Samsung S7

Can you capture a video and a bugreport on both

1) Pixel Android 9 - cannot reproduce, sensor is on the back, and dialog works for me
2) Huawei mate 20 Android 8.1.0?

My suspicion is that on the Huawei device, we're going through the FingerprintManager path on support library, and Huawei is overlaying it with their own in-display FP UI. The UI should consume touches and not propagate them, otherwise the dialog will be canceled.

The issue we were seeing on Samsung drives is it is very easy to fat-finger and tap the screen because the fingerprint sensor is on the front. This was with the compat dialog. I think always  setting Dialog#setCanceledOnTouchOutside(false) is a reasonable solution as you can still use the back button to cancel the dialog.

The safer way seems to me like disallowing the library from being dismissed from taps outside. The back button is still there, which gives the user an escape hatch.

Attached wrong bug number, fixed in following commit

Project: platform/frameworks/support
Branch: androidx-master-dev

commit 2aa297a0d4a014a06766b1658b6c9438ecff30fc
Author: Kevin Chyn <kchyn@google.com>
Date:   Thu Jul 18 16:42:48 2019

    Do not allow the fingerprint dialog to be canceled due to touches outside
   
    It's safer to disallow this, since on some devices the sensor is on the
    home button, etc, where it's easier to miss. Since the support library
    is supposed to simplify developer's lives, we should just default to
    preventing this on all pre-P devices, rather than potentially exposing
    an API for developers to toggle based on device type (too complicated).
   
    Fixes: 125447052
   
    Test: Touches outside no longer cancel authentication. Back button cancels
          authentication still.
   
    Change-Id: I6639b2ecdf18f82a242fffba63eeb8ca45d53dc9

M       biometric/src/main/java/androidx/biometric/FingerprintDialogFragment.java

https://android-review.googlesource.com/1087531
https://goto.google.com/android-sha1/2aa297a0d4a014a06766b1658b6c9438ecff30fc

I didn't get how you marked it to fixed. I'm using Honor 9 Lite phone and clicking outside the Biometric prompt is still cancelling the dialog

Using Xiaomi Mi A2, when the biometricprompt comes up and i press outside the dialog box, the biometric prompt closes. I'm using androidx.biometric:biometric:1.0.1 library