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

User · Answer

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

User · Answer

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

User · Answer

This works perfectly fine for me   AdapterChart adapterChart   new AdapterChart getContext   messageList   recyclerView setAdapter adapterChart   recyclerView scrollToPosition recyclerView getAdapter   getItemCount  -1

User · Answer

If you want just starting from the end use  layoutManager stackFromEnd   true   Kotlin solution

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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  lt  fcvip    lcvip  lt  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                amp  amp  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  lt  0  amp  amp  fcvip    position      dy  gt  0  amp  amp  lcvip    position                    stop scrolling             recyclerView setOnScrollListener null                                          if  position  lt  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

User · Answer

In Kotlin   recyclerView viewTreeObserver addOnGlobalLayoutListener   scrollToEnd      private fun scrollToEnd              adapter itemCount - 1  takeIf   it  gt  0    let recyclerView  smoothScrollToPosition

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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

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I know its late to answer here  still if anybody want to know solution is below  conversationView smoothScrollToPosition conversationView getAdapter   getItemCount   - 1

User · Answer

You must hide AppBarLayout before scrollToPosition if you are using him

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Roc answer is a great help  I would like to add a small block to it   mRecyclerView scrollToPosition mAdapter getItemCount   - 1

User · Answer

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

User · Answer

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

User · Answer

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

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Solution for Kotlin   apply below code after setting  recyclerView adapter  or after  recyclerView adapter notifyDataSetChanged     recyclerView scrollToPosition recyclerView adapter itemCount - 1

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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  gt   Build VERSION CODES JELLY BEAN                    view recycler view viewTreeObserver removeOnGlobalLayoutListener this                else                    Suppress  DEPRECATION                   view recycler view viewTreeObserver removeGlobalOnLayoutListener this                            adapter  itemCount  takeIf   it  gt  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

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To scrolldown from any position in the recyclerview to bottom  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

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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

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Add this code after sending message and before getting message from server  recyclerView scrollToPosition mChatList size   - 1

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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

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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

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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

User · Answer

IF you have adapter attached with recyclerView then just do this   mRecyclerView smoothScrollToPosition mRecyclerView getAdapter   getItemCount

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

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