是否可以在AppBar / CollapsingToolbarLayout之外设置折叠布局？

Question

My client requested a collapsing view (triggered by a recycler view) that doesn't graphically belong to AppBar / Toolbar abstraction. While I was able to fake it somehow with the mentioned view sitting really inside CollapsingToolbarLayout, I really feel the code is clumsy and will be a nightmare to maintain.

The name CoordinatorLayout suggests that maybe the collapsing / parallax behaviour could be used anywhere in view hierarchy, but I couldn't find neither example nor any proof of in Android docs. All examples show collapsing views only inside AppBars!

So - is it or is it not possible to collapse any view anywhere with events from some RecyclerView?

Since it was requested - a schematic view of the layout. But the question is really more general. As stated above - I've implemented it putting the collapsable square inside AppBar and setting background to white. It works as required, but looks hacky...

Answer 1

I really feel the code is clumsy and will be a nightmare to maintain.

I don't think so.

Also CollapsingToolbarLayout is optional (Remember, you can use minHeight if you want).

But you have to keep AppBarLayout to get things worked. (Don't forget to set app:elevation="0dp" to the AppBarLayout )

Is it or is it not possible to collapse any view anywhere with events from some RecyclerView ?

Yes, it is possible. By attaching an OnScrollListener to the RecyclerView and manually collapsing it. But I think the AppBarLayout method will be enough for this.