What's the name of this Button?

Question

Which is the name of the method/library which collapses/extends a list triggered by the user action? Please see the image below to understand my use case.

Answer 1

As far I can see you have a List View with one Item, and on press you want to show a sublist. I guess you do not know Android terms and you are thinking from an abstract design point of view.

In more technical terms you need to expand a ListView when the user touches the item.

Here you can find a tutorial to use ExpandibleListVIew

Please consider that nowdays is really used in place of ListView a library called RecyclerView, and here and maybe even better this stack overflow post where you can find a valid method that explain your UX use case, without recurring to external libraries but capitalizing the method onBindViewHolder, as allegedly recommended at a Google I/O official conference.

RecyclerView offers much more functionalities, animations and should be the best option to go if the app increases in complexity, namely a real life scenario.

Answer 2

you can use expandable recyclerview

eg Expandable recycler view