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ge...@gmail.com
Hi, thanks for reporting.
As a temporary workaround, you can probably:
- unregister your margin transformer
- register a MarginPageTransformer with an offset of 0
- viewpager2.requestTransform()
- viewpager2.adapter.notifyItemInserted()
- revert back to the original transformer
It should be indistinguishible from the user perspective when done while viewPager.getScrollState() == SCROLL_STATE_IDLE (at that stage, there is no visible offset).
If it's not there, OnPageChangeCallback will notify you once the viewpager changes to SCROLL_STATE_IDLE.
Alternatively, if you don't want the animation, a notifyDatasetChanged() should work fine. Especially if you're using Fragments, as they will be kept around.
Apologies for the extra steps. We'll look into it!
As a temporary workaround, you can probably:
- unregister your margin transformer
- register a MarginPageTransformer with an offset of 0
- viewpager2.requestTransform()
- viewpager2.adapter.notifyItemInserted()
- revert back to the original transformer
It should be indistinguishible from the user perspective when done while viewPager.getScrollState() == SCROLL_STATE_IDLE (at that stage, there is no visible offset).
If it's not there, OnPageChangeCallback will notify you once the viewpager changes to SCROLL_STATE_IDLE.
Alternatively, if you don't want the animation, a notifyDatasetChanged() should work fine. Especially if you're using Fragments, as they will be kept around.
Apologies for the extra steps. We'll look into it!
vi...@google.com
Project: platform/frameworks/support
Branch: androidx-master-dev
commit f3df487541c41b9b0e81199a73eaeda058cab7a9
Author: Jakub Gielzak <jgielzak@google.com>
Date: Thu Aug 01 22:20:00 2019
Fix for PageTransformer + dataSet animations clash
Suspends data-set change animations in the presence of a
PageTransformer.
Bug: 134658996
Test: ./gradlew viewpager2:connectedCheck
Change-Id: I873f7233a87b553ef6f410a76b35e6567bd4dc80
A viewpager2/src/androidTest/java/androidx/viewpager2/widget/PageTransformerItemAnimatorTest.kt
M viewpager2/src/main/java/androidx/viewpager2/widget/ViewPager2.java
https://android-review.googlesource.com/1095609
https://goto.google.com/android-sha1/f3df487541c41b9b0e81199a73eaeda058cab7a9
Branch: androidx-master-dev
commit f3df487541c41b9b0e81199a73eaeda058cab7a9
Author: Jakub Gielzak <jgielzak@google.com>
Date: Thu Aug 01 22:20:00 2019
Fix for PageTransformer + dataSet animations clash
Suspends data-set change animations in the presence of a
PageTransformer.
Bug: 134658996
Test: ./gradlew viewpager2:connectedCheck
Change-Id: I873f7233a87b553ef6f410a76b35e6567bd4dc80
A viewpager2/src/androidTest/java/androidx/viewpager2/widget/PageTransformerItemAnimatorTest.kt
M viewpager2/src/main/java/androidx/viewpager2/widget/ViewPager2.java
Description
What
User experience
What type of Android issue is this?
Other issue
What steps would let us observe this issue?
What was the effect of this issue on your device usage, such as lost time or work?
None - device worked normally
When
Time and frequency
Time when bug report was triggered: Mar 31, 2025 10:19 PM GMT+01:00
How often has this happened?
Occasionally
Where
Component
Originating component: <not visible> (1684638)
Build and device data
- Build Number: google/komodo_beta/komodo:16/BP22.250221.013/13218340:user/release-keys
(Note: It is the build when sending this report. For exact build reference, please see the attached bugreport.)
Debugging information
Google Play services
com.google.android.gms
Version 251036035 (25.10.36 (260400-739992411))
System App (Updated)
Android System WebView
com.google.android.webview
Version 699813533 (134.0.6998.135)
System App (Updated)
Network operator: O2 - UK
SIM operator: giffgaff
Filed by Android Beta Feedback. Version (Updated): 2.46-betterbug.external_20241023_RC01 (DOGFOOD)https://developer.android.com/preview/feedback#feedback-app .
To learn more about our feedback process, please visit