Scrolling issues in Android 9.0 Pie

[sandeepsipl]

We have a strange issue with scrolling. When there are 100+ messages and we scroll the list on the Android phone having version 9.0 Pie, the scrolling is stuck and scroll in the wrong direction.

Like, if we try to scroll up speedy, then it came at the last message instead of scroll up and vice-versa.

Has anyone faced this issue earlier?

[sandeepsipl]

Any Updates?

[Muthutc]

Hi @sandeepsipl

Is it working in iOS.

[danielbalderas]

Hi @sandeepsipl Did you find a solution for this issue? I have the same problem

[sandeepsipl]

Hi @sandeepsipl

Is it working in iOS.

Yes, In iOS, Its working fine. I've tested till iOS 12.3

[danielbalderas]

Hi @sandeepsipl
Is it working in iOS.

Yes, In iOS, Its working fine. I've tested till iOS 12.3

But in Android 9.0?
I can't find a solution, I know is a problem with the rotationX property

[jaykumarthaker]

I have the same problem, any solution so far?

[danielbalderas]

I have the same problem, any solution so far?

The problems is still on android, so I implement a temporal solution. try to detect what type of scroll the user is doing and if is ScrollState.Fling invoke the scrollTo event on your listview again

[jaykumarthaker]

Thank you so much for the hint @danielbalderas 👍
So, on ScrollState.Fling we shall invoke scrollTo(), for instance below (scrolls to bottom):

ListViewMessages.ScrollTo (ViewModel.Messages [ViewModel.Messages.Count - 1], ScrollToPosition.End, true);

Now, how should we define ScrollTo? You mean, if ScrollState.Fling then scroll 10 items up or scroll 10 items down? Something like that?

Um, any chance you might be able to share code for this?

[VasenevEA]

I have this problem too. May be we can change something in ListViewRenderer?

[gioggio79]

Same problem here. Any solution?
Or maybe you can post your workaround?

[gioggio79]

If you need help for get the ScrollState Event follow this blog, it help me a lot
(http://aklazy.blogspot.com/2019/06/how-to-detect-listview-scroll-state.html)

[acuntex]

Reversing the CollectionView and the Items works great on iOS and some Android devices.

But on some Android devices like Samsung if you scroll up, the CollectionView scrolls down and if you scroll down, the CollectionView scrolls up. (Problem only occurs, if you scroll hard enough and let him scroll alone. dunno how to explain it better)

Is there any fix for this?
Is FlowDirection="RightToLeft" and Rotation="180" still the best practice as of 2020?

[acuntex]

It's apparently an Android bug, workaround here: xamarin/Xamarin.Forms#7166 (comment)

[angelru]

@acuntex
does the code passed to a CollectionView work fine too?

[acuntex]

@angelru Yes, the code in the linked comment works.