android - How to use RecyclerView.scrollToPosition() to move the position to the top of current view?

Question

The RecyclerView.scrollToPosition() is extremely strange. for example, supposed a RecyclerView named "rv".

1. if now item 10 is under the current RecyclerView, call rv.scrollToPosition(10), the RecyclerView will scroll item 10 to bottom.

2. if now item 10 is in the current RecyclerView, call rv.scrollToPosition(10), there won't be any scrolling, nothing will be done.

3. if now item 10 is on the top of the current RecyclerView, call rv.scrollToPosition(10), the RecyclerView will scroll item 10 to top.

To help understanding, look at this picture

But what i need is that, whenever i call it, the RecyclerView will scroll the supposed position to the top of current view just like case 3. How to do that?

Answer 1

If I understand the question, you want to scroll to a specific position but that position is the adapter's position and not the RecyclerView's item position.

You can only achieve this through the LayoutManager.

Do something like:

rv.getLayoutManager().scrollToPosition(youPositionInTheAdapter).