ScrollToPosition make the header dissapear about android-parallax-recyclerview

[jkyeo]

I have the same issue with you.

[kanytu]

Hi..

Sorry for the time I took to help you with this issue.

Could you try recyclerView.getLayoutManager().smoothScrollToPosition instead?

[jkyeo]

@kanytu
SmoothScrollToPosition() has no such issue both on recyclerView or recyclerView.getLayoutManager() object. But ScrollToPosition() has such issue on both of them.

Well, it looks like that ScrollToPosition() also push the parallax header the same distance as the recyclerView items. For example in the screenshot:

As you can see. I scroll the recyclerView for the distance about a half of the parallax header height. And then call ScrollToPosition(0) method. It shows the last pic.

Think that if I scroll the recyclerView for more distance, the parallax header will be pushed out of screen. SO , it disappear.

[kanytu]

But didnt you solved your problem by changing to smoothscroll? Because the problem is that scrolltoposotion doesn't call onSroll. That's why you get that effect

[jkyeo]

@kanytu Yes, smooth scroll do resolve this problem. But in some situation, for example, long recyclerView, smooth scroll need wait for a relatively long time. So, it need scrollToPosition().

So, is it possible that scrollToPosition() method go well in parallax-recyclerView?

Thank you for your reply, @kanytu .

[kanytu]

@kooze I will need you to override LinearLayoutManager to change the method for smoothScrollToPosition. The problem here is that scroolToPosition doesn't call the listener onScroll which is responsible to change the view offset.

http://stackoverflow.com/a/28853254/3410697

Here you can find an explanation of how to change the speed of smoothScrollToPosition. The first solution should be the best one. The calculateSpeedPerPixel is controls the speed of the scroll animation. With some tweaks you should be able to mimify the same effect of scrollToPosition()

Good luck :)