Android - recycler view scroll to position doesn't work

Question

I am trying to retrieve data from firebase then display it in recycler view. I set the layout to be reverselayout = true. However, when I run the activity, the view starts at the bottom. I tried to change the initial position when the application is run using scrollToPosition as commented below, but still nothing changes. Does anyone have a solution related to this problem?

I've tried this: https://stackoverflow.com/a/26876044/7825519 But still start from bottom.

mRecyclerView!!.layoutManager = LinearLayoutManager(this, RecyclerView.VERTICAL, false)
    (mRecyclerView!!.layoutManager as LinearLayoutManager).reverseLayout = true
    (mRecyclerView!!.layoutManager as LinearLayoutManager).stackFromEnd = true
    mRecyclerView?.scrollToPosition(3)
//        mRecyclerView?.smoothScrollToPosition(3)
//        (mRecyclerView!!.layoutManager as LinearLayoutManager).scrollToPositionWithOffset(3,0)
//        mNestedScrollView?.scrollTo(0,3)
    mAdapter = DiscoverAdapter(mItems, mPostKey, Static.mLikedPosts, this)
    mRecyclerView!!.adapter = mAdapter
    val spacingInPixels = resources.getDimensionPixelSize(R.dimen.margin_between_card)
    mRecyclerView!!.addItemDecoration(SpacesItemDecoration(spacingInPixels))

You might want to look at this: https://android-pratap.blogspot.com/2015/01/recyclerview-with-checkbox-example.html — Dinesh Neupane, Jul 10 '18 at 09:20
Do you want to start from the bottom? Because this is what you're asking with reverseLayout=true and stackFromEnd = true. — , Jul 10 '18 at 09:20
Possible duplicate of [Scroll RecyclerView to show selected item on top](https://stackoverflow.com/questions/26875061/scroll-recyclerview-to-show-selected-item-on-top) — Sphinx, Jul 10 '18 at 09:22
@mTak I want to start from a position other than the bottom position — mrtn_24, Jul 10 '18 at 09:27
@mTak I try stackFromEnd = true and false nothing happen. I use reverselayout = true to reverse the order of my data from firebase. It works, but the scroll position starts from bottom. I want to change it from the other position — mrtn_24, Jul 10 '18 at 09:34
see my answer. I did not see that that you set the adapter after you try to scroll — , Jul 10 '18 at 09:35

score 0 · Answer 1 · 2018-07-10T09:50:58.360

0

First of all delete the both lines that make the recyclerview start from the botom. Set the scrolling after you set the adapter:

mRecyclerView!!.adapter = mAdapter
mRecyclerView?.scrollToPosition(3)

edited Jul 10 '18 at 09:50

answered Jul 10 '18 at 09:31

1

Still start from bottom :( – mrtn_24 Jul 10 '18 at 09:39
Do they all fit to the screen? It would be better if you post an image of the starting screen – Jul 10 '18 at 09:44
Are you sure the position of the item is 3? – Jul 10 '18 at 09:58
yes. I try to start from position 0, 1, 2, mItems.size()-1. But nothing happen. Still start from bottom when reverseLayout = true. – mrtn_24 Jul 10 '18 at 10:02
Try scrollToPosition(mItems.size()-3) or scrollToPosition(mItems.size()-4) – Jul 10 '18 at 10:05

score 0 · Answer 2 · answered Jul 24 '18 at 14:38

0

Try to set scrollToPosition using post method of View

answered Jul 24 '18 at 14:38

Constantin Chernishov

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Android - recycler view scroll to position doesn't work

2 Answers2