Fragment Flickering issue with FragmentTransactions.TRANSIT [166155034]

Fixed

Bug

Status Update

No update yet.

Description

[Deleted User]

created issue #1

Aug 25, 2020 01:22PM

Component used: AppCompatActivity
I am experiencing fragment flickering on transitions from left to right on the previous fragment only on the first animation.

Comments

ki...@google.com <ki...@google.com> Aug 25, 2020 01:23PM

Status: New

[Deleted User] <[Deleted User]> #2Aug 25, 2020 02:59PM

I am using
androidx_appCompat : 'androidx.appcompat:appcompat:1.3.0-alpha02',
androidx_nav_fragment : 'androidx.navigation:navigation-fragment-ktx:2.3.0',
androidx_nav_ui : 'androidx.navigation:navigation-ui-ktx:2.3.0',

il...@google.com <il...@google.com> #3Aug 25, 2020 03:50PM

Please include a sample project that reproduces your issue.

[Deleted User] <[Deleted User]> #4Aug 27, 2020 08:50AM

Hello. I'm experiencing the same problem after updating to fragment:1.3.0-alpha08 . It seems to be related to new State Manager as described here https://medium.com/androiddevelopers/fragments-rebuilding-the-internals-61913f8bf48e . When I disable the new state manager FragmentManager.enableNewStateManager(false), the transition looks fine.

The transaction is used as:

supportFragmentManager.commitTransaction(allowStateLoss = false, addToBackStack = false) { transaction ->
   transaction.hide(currentFragment)
   transaction.show(newFragment)
   transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
}

When the transition is removed (or set to TRANSIT_NONE), there is naturally no flickering.

[Deleted User] <[Deleted User]> #5Aug 28, 2020 08:58PM

I'm seeing this as well, but on more than just the first animation. Navigating to or popping a destination will show either the previous fragment or the next fragment for a split second while the animation is running.

il...@google.com <il...@google.com> #6Sep 1, 2020 10:04PM

Assigned to jb...@google.com.

The blinking when using the Animation API is due to b/163084315.

We should update the TRANSIT_FRAGMENT_FADE to use the Animator API, which doesn't suffer from that same issue.

Re #5 - if you have an flickering issue that doesn't involve one of the FragmentTransaction.TRANSIT_ values, please file that as a separate bug so we can track that work independently from this.

ap...@google.com <ap...@google.com> #7Sep 11, 2020 09:25PM

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

commit d9a2faae0bb43332e8c66d465375bbb1efce0340
Author: Jeremy Woods <jbwoods@google.com>
Date: Thu Sep 10 17:12:06 2020

Change default fragment transits to use animators

This change makes our default fragment transit effects use Animator
instead of Animation. Moving forward we want to encourage developers to
move away from Animation and we should do so as well.

Test: tested in several apps
Bug: 166155034
Change-Id: I3742899d3aab9823548e143e03a137b5291fc713

M fragment/fragment/src/main/java/androidx/fragment/app/FragmentAnim.java
D fragment/fragment/src/main/res/anim/fragment_close_enter.xml
D fragment/fragment/src/main/res/anim/fragment_close_exit.xml
D fragment/fragment/src/main/res/anim/fragment_fade_exit.xml
D fragment/fragment/src/main/res/anim/fragment_open_enter.xml
D fragment/fragment/src/main/res/anim/fragment_open_exit.xml
A fragment/fragment/src/main/res/animator/fragment_close_enter.xml
A fragment/fragment/src/main/res/animator/fragment_close_exit.xml
M fragment/fragment/src/main/res/animator/fragment_fade_enter.xml
M fragment/fragment/src/main/res/animator/fragment_fade_exit.xml
A fragment/fragment/src/main/res/animator/fragment_open_enter.xml
A fragment/fragment/src/main/res/animator/fragment_open_exit.xml

https://android-review.googlesource.com/1425448

jb...@google.com <jb...@google.com> #8Sep 16, 2020 11:17PM

Marked as fixed.

This has been fixed internally and will be available in the next release of Fragments.