Using Deep Link causes a "flash" that appears like multiple apps are opening [130362979]

Fixed

Bug

Status Update

No update yet.

Description

br...@gmail.com

created issue #1

Apr 11, 2019 07:16PM

Component used: Navigation
Version used: 2.1.0-alpha02
Devices/Android versions reproduced on: Pixel 3XL, APi 28

When using an implicit deep link to open an app to a destination that is not the root/home destination, the user experiences a weird "flash" on the device, where it appears to open the app, and then open the app again. See the attached animated gif for a demo of the flash effect.

The attached sample app, QueryString can be used to reproduce the issue. The app contains two destination fragments, RootFragment and ChildFragment. In the navigation graph, RootFragment is the start destination, and contains an action to navigate to ChildFragment. Child Fragment also has a <deeplink> with it's URI set to "

bradball.net/child".

To reproduce the "flash" effect:
1. open, build, and install the sample app on a device or emulator
2. Open the app to make sure it's working
3. Close the app (swipe it away from the recents screen).
3. Open a link to

https://bradball.net/child from another app. On an emulator, you can send a text message to the messages app with the URL in the message, and then tap on the link in the messages app.

When you tap on the link in the messages app, you'll see the "flash" of the app opening, and the the app opening again.

QueryString.zip

1.1 MB

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screenflash.gif

3.5 MB

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Comments

il...@google.com <il...@google.com> #2Apr 11, 2019 08:22PM

Assigned to il...@google.com.

Nested scrolling works partially (as per

http://b/122818889). Let's discuss if we need full support and if so make sure it works.

th...@gmail.com <th...@gmail.com> #3Apr 11, 2019 08:43PM

Hi!

What is 'partially' exactly?
How do I see it?
Thanks!

br...@gmail.com <br...@gmail.com> #4Apr 11, 2019 09:24PM

As of now:
- Nesting scroll views with a scroll direction perpendicular to the ViewPager2's orientation inside ViewPager2 works
- Nesting scroll views with a scroll direction parallel to the ViewPager2's orientation inside ViewPager2 does not work

il...@google.com <il...@google.com> Jun 3, 2019 05:57PM

Reassigned to jb...@google.com.

ap...@google.com <ap...@google.com> #5Jun 3, 2019 09:45PM

Horizontal ViewPager2 not correctly working into a vertical RecyclerView
Set a setNestedScrollingEnabled to the RecyclerView into the ViewPager2 (across reflection) resolves the problem

jb...@google.com <jb...@google.com> #6Jun 3, 2019 09:50PM

Marked as fixed.

ageevvalentin@gmail.com, could you provide a sample app? I'd like to learn more about the circumstances that cause the problem; putting a clean ViewPager2 inside a clean RecyclerView seems to work fine, so there must be other factors involved.

Issue 130362979