How to scroll to the bottom of a RecyclerView? scrollToPosition doesn't work

Question

I'd like to scroll to the bottom of the RecyclerView list after loading the activity.

GENERIC_MESSAGE_LIST = (ArrayList) intent.getExtras().getParcelableArrayList(ConversationsAdapter.EXTRA_MESSAGE);
conversationView = (RecyclerView) findViewById(R.id.list_messages);
conversationView.setHasFixedSize(true);
conversationViewLayoutManager = new LinearLayoutManager(this);
conversationView.setLayoutManager(conversationViewLayoutManager);
conversationViewAdapter = new ConversationAdapter(GENERIC_MESSAGE_LIST, this);
conversationView.setAdapter(conversationViewAdapter);

conversationView.scrollTo(...) throws an exception about being not supported in RecyclerView, and conversationView.scrollToPosition(...) doesn't seem to do anything.

After the above block of code, I added

conversationView.scrollToPosition(GENERIC_MESSAGE_LIST.size() + 1)

which doesn't work. There are 30 elements in GENERIC_MESSAGE_LIST.

Are you calling `scrollToPosition` immediately after setting the adapter? — ianhanniballake, Oct 27 '14 at 03:42
@ianhanniballake yes, it's right after `conversationView.setAdapter(conversationViewAdapter);`. — waylaidwanderer, Oct 27 '14 at 05:30
It is probably because you are calling +1 instead of -1 so the 5th element would be position [4] because it starts at 0. Doing +1 would give you an ArrayOutOfBounds ... did it not crash there? — RCB, Feb 12 '16 at 16:43
Add after setadapter mRecyclerView.scrollToPosition(carsList.size()-1); — Codelaby, Sep 23 '16 at 08:56

Roc Boronat · Answer 1 · 2018-04-19T21:34:43.170

442

I was looking at this post to find the answer but... I think everyone on this post was facing the same scenario as me: scrollToPosition() was fully ignored, for an evident reason.

What I was using?

recyclerView.scrollToPosition(items.size());

... what WORKED?

recyclerView.scrollToPosition(items.size() - 1);

edited Apr 19 '18 at 21:34

answered Nov 21 '14 at 14:04

Roc Boronat

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`recyclerView.scrollToPosition(messages.size()-1);` really works for me, I just wonder the reason. – Engine Bai Mar 06 '15 at 10:01
26

This worked for me. It actually makes sense because Java lists are zero based. E.g. list [0,1,2] has a size of 3 but the last position is 2 because it starts with 0. – Calvin Mar 20 '15 at 07:46
22

FYI, for a smooth scroll, there is `smoothScrollToPosition(...)`. – Ivan Morgillo Jul 17 '15 at 08:17
6

@Ivan Morgilo smoothScrollToPosition doesn't work at all :S – cesards Jul 30 '15 at 07:59
2

@IvanMorgillo - your answer seems to work better both with the result wanted and more smooth =D. seems like scroll to position is a bit buggy for me (my guess is that there's a small delay between the function called and the creation of the view? anyways it's not working properly) – Roee Jul 04 '16 at 15:42
I tested manually by recyclerView.scrollToPosition(4), and then realized that when using adapter.getItemCount() I am getting one more than required. – Ishan Aug 29 '16 at 21:35
haha, you are correct. I totally forgot that position starts at 0, while list.size() starts from 1. That is why it didn't work. Thanks man – M.Baraka Jun 12 '17 at 11:35
1

for those with `reverseLayout = true` and `stackFromEnd = true` set, scroll to `0` because it's the bottom most item. – CHAN Jun 20 '19 at 10:37

score 226 · Accepted Answer · edited Jul 12 '16 at 11:24

226

Just set setStackFromEnd=true or setReverseLayout=true so that LLM will layout items from end.

The difference between these two is that setStackFromEnd will set the view to show the last element, the layout direction will remain the same. (So, in an left-to-right horizontal Recycler View, the last element will be shown and scrolling to the left will show the earlier elements)

Whereas setReverseLayout will change the order of the elements added by the Adapter. The layout will start from the last element, which will be the left-most in an LTR Recycler View and then, scrolling to the right will show the earlier elements.

Sample:

final LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
linearLayoutManager.setReverseLayout(true);
_listView.setLayoutManager(linearLayoutManager);

See documentation for details.

edited Jul 12 '16 at 11:24

IcyFlame

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answered Nov 21 '14 at 20:32

yigit

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165

This might be something userful, but it does not seem to answer the question that was asked. – joseph May 19 '15 at 10:47
Useful to create chat interface ! – Neige Aug 28 '15 at 09:13
6

If you set both stackFromEnd=true and setReverseLayout=true it doesn't work. Does anyone know any workaround? – Luccas Correa Jan 22 '16 at 16:55
11

For chat view linearLayoutManager.setStackFromEnd(true) works. – Muneeb Mirza May 19 '16 at 11:37
8

This does not address the question at all. – Orbit Jun 23 '16 at 03:39
how about the scroll listener when setReverseLayout is true? does it also reverse? – Angga Ari Wijaya Sep 13 '16 at 06:36
3

Only works until the view is full. It doesn't intent scroll, just stack from the bottom. – MiguelSlv Dec 30 '17 at 14:42
This can't be the proper answer to the question. This is a recyclerview issue. – Mostafa Imran Jul 31 '23 at 05:49

score 61 · Answer 3 · edited Sep 11 '17 at 22:27

61

I know its late to answer here, still if anybody want to know solution is below

conversationView.smoothScrollToPosition(conversationView.getAdapter().getItemCount() - 1);

edited Sep 11 '17 at 22:27

Stan Kurilin

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answered Jun 09 '16 at 07:28

WritingForAnroid

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It should be `conversationView.smoothScrollToPosition(conversationView.getAdapter().getItemCount() **-1**);` as positions in lists are zero-based. – Berťák Dec 01 '16 at 09:20
3

This wont help if height of last row is more then screen height. – Anuj Jindal Jan 16 '17 at 06:21
This is what I needed. Although I had to wrap it in a handler postdelay to get everything working correctly. – Marc Alexander Mar 06 '19 at 20:46

Muhammad Umair Shafique · Answer 4 · 2021-07-09T13:38:35.167

42

To scrolldown from any position in the recyclerview to bottom

Kotlin

editText.setOnClickListener {
    rv.postDelayed({                 
        rv.scrollToPosition(rv.adapter.itemCount - 1)
    }, 1000)
}

Java

edittext.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                rv.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                      rv.scrollToPosition(rv.getAdapter().getItemCount() - 1);
                    }
                }, 1000);
            }
        });

edited Jul 09 '21 at 13:38

answered Nov 04 '15 at 07:33

Muhammad Umair Shafique

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Thanks. Adding the delay solved the issue I was having. I have a recyclerview (which can expand and collapse) inside another recyclerview. The expand/collapse animation is 300ms so I just needed to add that delay. But for smoother scroll I used smoothScrollToPosition instead. – Gemeaux Jan 10 '23 at 17:02

Shubham Agrawal · Answer 5 · 2018-12-22T14:10:24.223

17

Add this code after sending message and before getting message from server

recyclerView.scrollToPosition(mChatList.size() - 1);

edited Dec 22 '18 at 14:10

answered Jul 06 '18 at 11:11

Shubham Agrawal

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score 12 · Answer 6 · edited Dec 03 '17 at 20:49

12

When you call setAdapter, that does not immediately lay out and position items on the screen (that takes a single layout pass) hence your scrollToPosition() call has no actual elements to scroll to when you call it.

Instead, you should register a ViewTreeObserver.OnGlobalLayoutListener (via addOnGlobalLayoutListner() from a ViewTreeObserver created by conversationView.getViewTreeObserver()) which delays your scrollToPosition() until after the first layout pass:

conversationView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
  public void onGlobalLayout() {
    conversationView.scrollToPosition(GENERIC_MESSAGE_LIST.size();
    // Unregister the listener to only call scrollToPosition once
    conversationView.getViewTreeObserver().removeGlobalOnLayoutListener(this);

    // Use vto.removeOnGlobalLayoutListener(this) on API16+ devices as 
    // removeGlobalOnLayoutListener is deprecated.
    // They do the same thing, just a rename so your choice.
  }
});

edited Dec 03 '17 at 20:49

Saket

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answered Oct 27 '14 at 05:54

ianhanniballake

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1

Thanks, but this doesn't work. It breaks scrolling by stopping flinging from working, and if you drag, it scrolls by oddly fast. – waylaidwanderer Oct 27 '14 at 08:22
Sounds like you aren't removing the listener. It should only be called exactly once (right after the elements are first laid out) and not at all during scrolling. – ianhanniballake Oct 27 '14 at 13:47
`OnGlobalLayoutListener` probably not getting removed because you're checking for `vto.isAlive()`. I don't know the reason, but `ViewTreeObserver` sometimes is changed for a `View`, so instead of checking for `isAlive` you better just get current `ViewTreeObserver` with `conversationView.getViewTreeObserver().removeGlobalOnLayoutListener` – Dmitry Zaytsev Jan 12 '15 at 11:29
@ianhanniballake I've proposed an edit to fix this issue. – Saket Dec 03 '17 at 14:01

score 8 · Answer 7 · answered Jan 06 '21 at 19:01

The answer is

recyclerView.scrollToPosition(arrayList.size() - 1);

Everyone has mentioned it.

But the problem I was facing was that it was not placed correctly.

I tried and placed just after the adapter.notifyDataSetChanged(); and it worked. Whenever, data in your recycler view changes, it automatically scrolls to the bottom like after sending messages or you open the chat list for the first time.

Note : This code was tasted in Java.

actual code for me was :

//scroll to bottom after sending message.
binding.chatRecyclerView.scrollToPosition(messageArrayList.size() - 1);

score 7 · Answer 8 · edited May 24 '17 at 13:43

7

IF you have adapter attached with recyclerView then just do this.

mRecyclerView.smoothScrollToPosition(mRecyclerView.getAdapter().getItemCount());

edited May 24 '17 at 13:43

Robert

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answered May 24 '17 at 13:07

Wasim Amin

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well. thats a good answer – Muhaiminur Rahman Jul 31 '22 at 10:52

score 7 · Answer 9 · answered Oct 31 '18 at 08:13

7

Solution for Kotlin:

apply below code after setting "recyclerView.adapter" or after "recyclerView.adapter.notifyDataSetChanged()"

recyclerView.scrollToPosition(recyclerView.adapter.itemCount - 1)

answered Oct 31 '18 at 08:13

AbhinayMe

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score 6 · Answer 10 · answered Mar 14 '21 at 00:14

If you are having issues making recyclerview scroll to the latest, check that the recyclerview is not inside a nestedScrollView. That was my issue. I had to remove the nestedScrollview and then the below code worked.

binding.recyclerView.scrollToPosition(adapter.getItemCount() - 1);

score 5 · Answer 11 · answered Oct 28 '14 at 13:45

class MyLayoutManager extends LinearLayoutManager {

  public MyLayoutManager(Context context) {
    super(context, LinearLayoutManager.VERTICAL, false);
  }

  @Override public void smoothScrollToPosition(RecyclerView recyclerView,
      final RecyclerView.State state, final int position) {

    int fcvip = findFirstCompletelyVisibleItemPosition();
    int lcvip = findLastCompletelyVisibleItemPosition();

    if (position < fcvip || lcvip < position) {
      // scrolling to invisible position

      float fcviY = findViewByPosition(fcvip).getY();
      float lcviY = findViewByPosition(lcvip).getY();

      recyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() {

        int currentState = RecyclerView.SCROLL_STATE_IDLE;

        @Override public void onScrollStateChanged(RecyclerView recyclerView, int newState) {

          if (currentState == RecyclerView.SCROLL_STATE_SETTLING
              && newState == RecyclerView.SCROLL_STATE_IDLE) {

            // recursive scrolling
            smoothScrollToPosition(recyclerView, state, position);
          }

          currentState = newState;
        }

        @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) {

          int fcvip = findFirstCompletelyVisibleItemPosition();
          int lcvip = findLastCompletelyVisibleItemPosition();

          if ((dy < 0 && fcvip == position) || (dy > 0 && lcvip == position)) {
            // stop scrolling
            recyclerView.setOnScrollListener(null);
          }
        }
      });

      if (position < fcvip) {
        // scroll up

        recyclerView.smoothScrollBy(0, (int) (fcviY - lcviY));
      } else {
        // scroll down

        recyclerView.smoothScrollBy(0, (int) (lcviY - fcviY));
      }
    } else {
      // scrolling to visible position

      float fromY = findViewByPosition(fcvip).getY();
      float targetY = findViewByPosition(position).getY();

      recyclerView.smoothScrollBy(0, (int) (targetY - fromY));
    }
  }
}

and

MyLayoutManager layoutManager = new MyLayoutManager(context);
recyclerView.setLayoutManager(layoutManager);

RecyclerView.Adapter adapter = new YourAdapter();
recyclerView.setAdapter(adapter);

recyclerView.smoothScrollToPosition(adapter.getItemCount() - 1);

above code works, but it's not smooth and not cool.

score 5 · Answer 12 · answered Jun 26 '17 at 20:10

5

Roc answer is a great help. I would like to add a small block to it:

mRecyclerView.scrollToPosition(mAdapter.getItemCount() - 1);

answered Jun 26 '17 at 20:10

abedfar

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score 5 · Answer 13 · answered Feb 04 '18 at 23:28

5

In Kotlin:

recyclerView.viewTreeObserver.addOnGlobalLayoutListener { scrollToEnd() }

private fun scrollToEnd() =
        (adapter.itemCount - 1).takeIf { it > 0 }?.let(recyclerView::smoothScrollToPosition)

answered Feb 04 '18 at 23:28

yanchenko

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Hah, thanks for `GlobalLayoutListener`! After refactoring I had to use your method to scroll. Don't forget to remove the listener like in https://stackoverflow.com/questions/28264139/view-getviewtreeobserver-addongloballayoutlistener-leaks-fragment, or you won't scroll RecyclerView back to beginning. – CoolMind May 22 '19 at 16:45

score 4 · Answer 14 · answered Jan 31 '18 at 13:01

4

In my case where views do not have the same height, calling scrollToPosition on the LayoutManager worked to really scroll to the bottom and see fully the last item:

recycler.getLayoutManager().scrollToPosition(adapter.getItemCount() - 1);

answered Jan 31 '18 at 13:01

galex

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score 3 · Answer 15 · edited Nov 15 '19 at 12:50

First time scroll when entering in recycler view first time then use

linearLayoutManager.scrollToPositionWithOffset(messageHashMap.size()-1

put in minus for scroll down for scroll up put in positive value);

if the view is very big in height then scrolltoposition particular offset is used for the top of view then you use

int overallXScroldl =chatMessageBinding.rvChat.computeVerticalScrollOffset();
chatMessageBinding.rvChat.smoothScrollBy(0, Math.abs(overallXScroldl));

score 2 · Answer 16 · edited Jul 19 '17 at 15:14

2

This works perfectly fine for me:

AdapterChart adapterChart = new AdapterChart(getContext(),messageList);
recyclerView.setAdapter(adapterChart);
recyclerView.scrollToPosition(recyclerView.getAdapter().getItemCount()-1);

edited Jul 19 '17 at 15:14

fantaghirocco

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answered Jul 19 '17 at 14:47

amaresh hiremani

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score 2 · Answer 17 · answered Feb 01 '21 at 10:00

You can scroll to the bottom of the last item, if the height of the last item is too large, you need to offset

 private void scrollToBottom(final RecyclerView recyclerView) {
        // scroll to last item to get the view of last item
        final LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
        final RecyclerView.Adapter adapter = recyclerView.getAdapter();
        final int lastItemPosition = adapter.getItemCount() - 1;
    
        layoutManager.scrollToPositionWithOffset(lastItemPosition, 0);
        recyclerView.post(new Runnable() {
            @Override
            public void run() {
                // then scroll to specific offset
                View target = layoutManager.findViewByPosition(lastItemPosition);
                if (target != null) {
                    int offset = recyclerView.getMeasuredHeight() - target.getMeasuredHeight();
                    layoutManager.scrollToPositionWithOffset(lastItemPosition, offset);
                }
            }
        });



    }

the layoutManger doesn't have property of scrollToPositionWithOffset — Zahid Ali, Mar 28 '21 at 13:36
@ZahidAli you can see scrollToPositionWithOffset method in LinearLayoutManager.java — jiong103, Jun 16 '21 at 06:46

score 1 · Answer 18 · answered Apr 11 '18 at 03:01

this code will give you latest post first, i think this answer is helpful.

    mInstaList=(RecyclerView)findViewById(R.id.insta_list);
    mInstaList.setHasFixedSize(true);

    LinearLayoutManager layoutManager = new LinearLayoutManager(this);
    layoutManager.setOrientation(LinearLayoutManager.VERTICAL);

    mInstaList.setLayoutManager(layoutManager);
    layoutManager.setStackFromEnd(true);
    layoutManager.setReverseLayout(true);

CoolMind · Answer 19 · 2019-05-23T07:27:34.580

Tried a method of @galex, it worked until refactoring. So I used an answer of @yanchenko and changed a bit. Probably this is because I called scrolling from onCreateView(), where a fragment view was built (and probably didn't have right size).

private fun scrollPhotosToEnd(view: View) {
    view.recycler_view.viewTreeObserver.addOnGlobalLayoutListener(object :
        ViewTreeObserver.OnGlobalLayoutListener {
        override fun onGlobalLayout() {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                view.recycler_view.viewTreeObserver.removeOnGlobalLayoutListener(this)
            } else {
                @Suppress("DEPRECATION")
                view.recycler_view.viewTreeObserver.removeGlobalOnLayoutListener(this)
            }
            adapter?.itemCount?.takeIf { it > 0 }?.let {
                view.recycler_view.scrollToPosition(it - 1)
            }
        }
    })
}

You can also add a check of viewTreeObserver.isAlive like in https://stackoverflow.com/a/39001731/2914140.

score 1 · Answer 20 · answered Sep 22 '20 at 19:38

1

You must hide AppBarLayout before scrollToPosition if you are using him

answered Sep 22 '20 at 19:38

Evgenii

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score 1 · Answer 21 · answered Jul 09 '21 at 16:06

I know this is too late but this worked for me so that i am answering this question

first,

LinearLayoutManager layoutManager=new LinearLayoutManager(this);
layoutManager.setStackFromEnd(true);
recyclerView.setLayoutManager(layoutManager);

after that,

database.addValueEventListener(....){
@override
public void onDataCange(...){
....
....
//put this line here
recyclerView.smoothScrollToPosition(recyclerView.getAdapter().getItemCount()-1);
}
}

score 1 · Answer 22 · answered Dec 02 '21 at 02:21

1

if you use kotlin, try this

conversationView.post {
    scrollToPosition(conversationView?.adapter.itemCount - 1)
}

answered Dec 02 '21 at 02:21

Kiwan Park

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4

score 0 · Answer 23 · answered Apr 21 '17 at 11:48

Only Ian's answer was able to make my RecyclerView scroll to a specified position. However, The RecyclerView was not able to scroll afterwards when I used scrollToPosition(). smoothScrollToPosition() worked but the initial animation made it too slow when the list was long. The reason was the listener was not removed. I used the code below to remove the current ViewTreeObserver and it worked as a charm.

    mRecyclerView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            mRecyclerView.scrollToPosition(mPosition);
            mRecyclerView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
        }
    });

score 0 · Answer 24 · answered Jun 22 '20 at 00:55

If none of these worked,

you should try to use :

ConstraintLayout targetView = (ConstraintLayout) recyclerView.findViewHolderForAdapterPosition(adapter.getItemCount()-1).itemView;
targetView.getParent().requestChildFocus(targetView, targetView);

By doing this, you are requesting a certain ConstraintLayout (Or whatever you have) to be displayed. The scroll is instant.

I works even with keyboard shown.

score 0 · Answer 25 · answered Feb 12 '21 at 21:59

0

If you want just starting from the end use:

layoutManager.stackFromEnd = true

(Kotlin solution)

answered Feb 12 '21 at 21:59

Panagiotis Tzelalis

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Aaeb · Answer 26 · 2022-02-21T15:52:33.750

If you working with reversedLayout "chat interface" specially if you have images, you can try the following:

first, register DataObserver with the adapter

   chatAdapter.registerAdapterDataObserver(object : 
                         RecyclerView.AdapterDataObserver() {

   override fun onItemRangeInserted(positionStart: Int itemCount: Int) {

      val messageCount: Int = chatAdapter.itemCount

      val lastVisiblePosition: Int =
            layoutManager.findLastCompletelyVisibleItemPosition()

         if (lastVisiblePosition == -1 || positionStart <= (messageCount - 1)) {
            recyclerView.scrollToPosition(positionStart)
        }
    }
})

this will be called once you set the data for the adapter

second, you have to add a scroll listener to the recyclerView like this:

   recyclerView.addOnScrollListener(object 
     :RecyclerView.OnScrollListener() {

       override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: 
          Int) {
            super.onScrolled(recyclerView, dx, dy)

          val lastVisiblePosition: Int =
              layoutManager.findLastCompletelyVisibleItemPosition()
        if (lastVisiblePosition != -1 && lastVisiblePosition < 
                chatAdapter.itemCount - 1) {
            recyclerView.smoothScrollToPosition(0)
        }
    }
})

the AdapterDataObserver will give you successfully the insert event of data, however this does not imply that the ui is ready to scroll to new positions just yet, because the view you want to scroll to is not available yet — Kibotu, Sep 05 '22 at 17:14

score 0 · Answer 27 · edited Feb 05 '23 at 22:16

0

use

video_frames?.smoothScrollToPosition(pos.toInt())

this work for me*

edited Feb 05 '23 at 22:16

SwissCodeMen

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answered Feb 03 '23 at 06:40

Akshay

1

Karam J · Answer 28 · 2023-09-01T14:06:20.237

0

add this code for scroll to top mRecyclerView.scrollToPosition(0)

edited Sep 01 '23 at 14:06

answered Aug 30 '23 at 12:58

Karam J

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Add it where? And why? – Diego Borba Aug 31 '23 at 03:07
In code which have activity for RecyclerView postion 0 mean scroll to top – Karam J Sep 01 '23 at 06:12
So maybe you should specify it in your answer for better understanding. – Diego Borba Sep 01 '23 at 12:33

score -4 · Answer 29 · answered Jul 22 '21 at 11:42

-4

use only gravity for easy solution

android:layout_gravity="bottom"

answered Jul 22 '21 at 11:42

Dranisht A

1

How to scroll to the bottom of a RecyclerView? scrollToPosition doesn't work

29 Answers29

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