[ExtendedFloatingActionButton] Shrink and Expand animations whilst scrolling loose the position of the component

[DavidMarquezF]

Description:

I've created an EFAB that is a direct child of CoordinatorLayout. In the CoordinatorLayout there is a RecyclerView with a scroll listener that expands and shrinks the EFAB (I'm trying to replicate the m3 scrolling behaviors seen here)

The problem is that when the shrink/expand is triggered, if I'm scrolling fast, the button dissapears (it goes behind my nav bar, it's as if the animations lost the position).

https://github.com/user-attachments/assets/7f87cd44-1fca-4c08-9b99-a5b0942ce272

Expected behavior: Screenshots and/or description of expected behavior

Calling shrink/expand whilst scrolling shouldn't affect at all the position of the fab (more so because it's positioned in the CoordinatorLayout and anchored on top of the bottom navigation)

Source code:

class FabExtendingOnScrollListener(
    private val floatingActionButton: ExtendedFloatingActionButton
) : RecyclerView.OnScrollListener() {
    override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
        if (newState == RecyclerView.SCROLL_STATE_IDLE
            && !floatingActionButton.isExtended
            && recyclerView.computeVerticalScrollOffset() == 0
        ) {
            floatingActionButton.extend()
        }
        super.onScrollStateChanged(recyclerView, newState)
    }

    override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
        if (dy != 0 && floatingActionButton.isExtended) {
            floatingActionButton.shrink()
        }
        super.onScrolled(recyclerView, dx, dy)

Minimal sample app repro: Please consider attaching a minimal sample app that reproduces the issue. This will help narrow down the conditions required for reproducing the issue, and it will speed up the bug fix process. You may attach a zip file of the sample app or link to a GitHub repo that contains the sample app.

Android API version: 34

Material Library version: 1.11.0

Device: Pixel emulator, android v12

To help us triage faster, please check to make sure you are using the latest version of the library.

We also happily accept pull requests.

[DavidMarquezF]

If I disable the Expanding and shrink behaviour this doesn't happen at all. It seems like it is a problem of the animation.

I have other screens where the EFAB is not anchored to a view but just hanging around at the bottom of the screen and this also doesn't happen. It seems to be very specific to the fact that the EFAB is anchored somewhere.

[DavidMarquezF]

I've only been able to reproduce when I fling scroll, Not if i move up and down fast

[DavidMarquezF]

For anyone wondering there is a woraround:

Workaround

Create a new component that inherits from ExtendedFloatingActionButton and override the getBehavior function. Return null.

Why?

I'm guessing the current behavior (that should only work for BottomSheet and AppBar as of now, see this) doesn't work well with views that are not those ones. Either way I don't really get some of the functionality offered there, like moving it if a snackbar appears, since this is not what the m3 docs says (snackbar should appear on top of the fab)