[Android] Fix for CollectionView.EmptyView does not remeasure its height when the parent layout changes dynamically, causing incorrect sizing. #33559
+222
−0
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
…View dimensions change in ItemsViewHandler for Android
dotnet-policy-service
bot
added
the
partner/syncfusion
Tamilarasan-Paranthaman
added
platform/android
area-controls-collectionview
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Note
Are you waiting for the changes in this PR to be merged?
It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!
Root Cause:
The issue occurs because of Android RecyclerView reusing ViewHolders with previously measured dimensions and not automatically remeasuring them when only the layout size changes, causing the EmptyView to retain its old dimensions instead of adapting to the new available space.
Fix Description:
The fix involves explicitly forcing the EmptyView to remeasure when the RecyclerView dimensions change by detecting width or height updates, locating the corresponding EmptyView ViewHolder, and requesting a layout pass so it is resized to match the new available space. When the ViewHolder isn't immediately available, the layout request is deferred to the next UI loop iteration.
Issues Fixed
Fixes #33324
Tested the behaviour in the following platforms
Output Screenshot
CollectionViewLayoutIssue-BeforeFix.mov
CollectionViewLayoutIssue-AfterFix.mov