Enable Fragment to seek Transitions using the Predictive Back Gesture in API 34+ [285175724]

Fixed

Feature Request

Status Update

No update yet.

Description

jb...@google.com

created issue #1

May 31, 2023 08:08PM

API 34 provided a new Predictive Back Gesture that allows seeking when going back and provides a View of the previous Activity.

Now that this feature is available between Activities it would be nice if it was also available between Fragments. Fragments need to handle multiple effects system to get this working and this bug will focus on providing support for Transitions.

Comments

ap...@google.com <ap...@google.com> #2Sep 8, 2023 12:03AM

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jb...@google.com <jb...@google.com> #3Sep 8, 2023 01:15AM

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ap...@google.com <ap...@google.com> #4Sep 11, 2023 07:24PM

Rahul, don't know if this is a real issue or a benchmark being coded poorly thing. Passing along due to profileinstaller.

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jb...@google.com <jb...@google.com> #6Sep 15, 2023 03:06PM

Hi Marcelo, can you please take a look at this when you get a chance ? If not, I can come and take a look when I get back.

lb...@gmail.com <lb...@gmail.com> #7Sep 16, 2023 02:30PM

I'm pretty sure the offending PR here is aosp/2333568 - that is the only PR touching the profile transcoding.

It fixes an important bug with compressed profiles but it seems that the new code is slower than before.

jb...@google.com <jb...@google.com> #8Sep 18, 2023 02:08PM

If you look in the dashboard, the commit link is wrong, since it doesn't encompass all builds since the previous (9385400). Correct build range link is here, which includes Ben's CL: https://android-build.googleplex.com/builds/9385668/branches/aosp-androidx-main/targets/_/cls?end=9385400&inclusiveStart=1&inclusiveEnd=0

(If a build goes missing for any reason, it corrupts the commit link. In general, you can always go to dashboard, and create range link like the above)

as...@google.com <as...@google.com> #9Sep 18, 2023 04:10PM

Yes, it looks like my change introduced this regression. If I read this dashboard correctly, before the change it took a minimum of 0.0012 ms to install a profile and now it takes ~ 1.3 ms.
That would mean the change makes opening the file slower by about 1000 times.

Chris: Given this runs on a background thread and is not blocking app startup, is it urgent to address this or can it wait for the next release cycle?

na...@google.com <na...@google.com> #10Sep 20, 2023 07:15PM

The number in the triage page is synthetic, you need to click through to the dashboard here to see the real nanos. It went from 0.2ms to 46ms, which is a huge slowdown. We should fix this before cherry-picking / releasing this change.

lb...@gmail.com <lb...@gmail.com> #11Sep 20, 2023 09:02PM

Uploaded aosp/2355662 to address the problem.

as...@google.com <as...@google.com> #12Sep 20, 2023 09:35PM

The CL mentioned in comment#11 will land shortly and should fix this issue.

lb...@gmail.com <lb...@gmail.com> #13Sep 20, 2023 10:06PM

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

commit b7fc1b0247a4f4883b37c1998e3f12b4f0c0b7b0
Author: Ben Weiss <benweiss@google.com>
Date: Wed Dec 14 15:49:17 2022

More detailed compressed profile handling

Just replacing openFd with open dramatically decreased the performance
of opening a profile. This new handling goes back to openFd and
introduces a diagnostic code to hint at updating bundletool.

Bug: 261998144
Test: :profileinstaller:profileinstaller:test
RelNote: Add diagnostics for compressed profiles

Change-Id: I8641387ad6073dde588d0d764da4a3b24b1c8ee4

M profileinstaller/profileinstaller/api/current.txt
M profileinstaller/profileinstaller/api/public_plus_experimental_current.txt
M profileinstaller/profileinstaller/api/restricted_current.txt
M profileinstaller/profileinstaller/src/main/java/androidx/profileinstaller/DeviceProfileWriter.java
M profileinstaller/profileinstaller/src/main/java/androidx/profileinstaller/ProfileInstaller.java

https://android-review.googlesource.com/2355662

as...@google.com <as...@google.com> #14Sep 20, 2023 10:13PM

The landed CL has moved the benchmark down to normal levels again.

lb...@gmail.com <lb...@gmail.com> #15Sep 20, 2023 10:33PM

Comment has been deleted.

Message last modified on Sep 20, 2023 11:58PM

lb...@gmail.com <lb...@gmail.com> #16Sep 21, 2023 12:00AM

The following release(s) address this bug.It is possible this bug has only been partially addressed:

androidx.profileinstaller:profileinstaller:1.3.0-beta01

lb...@gmail.com <lb...@gmail.com> #17Sep 21, 2023 12:16AM

@14 The blocking to going to previous Fragment is important in case the previous Fragment is used as a way to choose which Fragment to reach, and not as UI.
This is something that was said to use instead of clearing the stack itself:

https://issuetracker.google.com/issues/109909461#comment5

https://developer.android.com/guide/navigation/use-graph/conditional

So you wouldn't want to show the MainFragment there, and instead you'd want to allow to skip directly to the Activity behind, even though MainFragment is in the back-stack of the navigation.

Sadly even there on this documentation, there is no sample and there is a lot of missing code.