Finally <https://android-review.googlesource.com/c/platform/frameworks/support/+/1704159> AnimatedC...

# compose

[Shakil Karim]

Finally https://android-review.googlesource.com/c/platform/frameworks/support/+/1704159 AnimatedContent 😍

[Michal Klimczak]

is it the missing piece for Lazy Column/Row animations?

[Shakil Karim]

I think it's related to Screen Animations which is based on new changes on AnimateVisibility child animations introduce in beta 08.

[Doris Liu]

is it the missing piece for Lazy Column/Row animations?

This is a more generic container that performs a ContentTransform when its content changes. More specifically it'll animate in the new content and animate out the previous content using customizable enter/exit transitions. What I'm particularly excited about is the support for a SizeTransform (also customizable) to automatically kick off a size animation when the content changes. Aside from these customization support, it is somewhat similar to Crossfade.

One concept employed in AnimatedContent that could be helpful for Lazy Column/Row animations is the ability to define enter/exit transitions for children at the parent level. Meanwhile, the children can access an AnimatedVisibilityScope to add any additional enter/exit animations (e.g. on color, corner radius, etc) local to that child.

[Colton Idle]

Doris, this got me thinking... If I use single activity, multiple fragments, but each fragment is just a Composable (we're doing this because we're not quite ready to jump into pure compose app), do you know if the material transformations that work with fragments (https://material.io/blog/android-material-motion) would still work in our scenario?

[Doris Liu]

It should still work in theory, since the transformations (fade, slide, etc) can still be done on the ComposeView in your fragments. @Ian Lake can probably give you more details when he's back from vacation. 🙂

[Colton Idle]

In that case... I hope Ian doesn't get back to me for a longggg time. Well deserved vacation!

[Zach Klippenstein (he/him) [MOD]]

Is this api something that might support shared element transitions in the future?

[Doris Liu]

This API is intended to be one of the APIs that support shared element in the future. 😛