how to add new items to recyclerview without scroll to top

Question

I want to set new items to top of recyclerview. But when I set items, recyclerview scroll to top automatically.
I tried many codes but I can't resolve that.
here is my addItem method:

 public void addItem(final ArrayList<String> list) { for (int i=0; i< list.size();i++){ items.add(i,list.get(i)); } activity.runOnUiThread(new Runnable() { @Override public void run() { // notifyDataSetChanged(); // notifyItemRangeInserted( 0,list.size() ); // notifyItemInserted(); notifyItemRangeInserted(10,11); // notifyDataSetChanged(); } }); }

I tried all of commented method.
could you please help me to resolve this??
Thanks

Omid Zamani · Accepted Answer · 2016-10-10 14:07:45Z

Finaly I got a solution. I put notifyItemRangeChanged after set new Items. my solution is:

 public void addItem(final ArrayList<String> list,int h) { final int oldsize = items.size(); for (int i=list.size()-1; i>=0 ;i--){ items.add(0,list.get(i)); } activity.runOnUiThread(new Runnable() { @Override public void run() { notifyItemRangeInserted(0,items.size()-oldsize); } }); }

I hope this is been useful for everyone. Thanks

Why the activity.runOnUiThread part? Don't you do this in the UI thread already? If it's not on the UI thread, you could theoratically have multi-threads issues, because list is used in both threads

iamabhaykmr · Accepted Answer · 2016-10-05 15:36:15Z

0

You can use recyclerView.scrollToPosition(pos); where pos is position where you want to focus your listview at after some operation on list.

edited Oct 5, 2016 at 15:36

answered Oct 5, 2016 at 15:28

iamabhaykmr

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3 Comments

Omid Zamani Over a year ago

my question is about recyclerView. not about listView

iamabhaykmr Over a year ago

similar mehtod is there for recyclerview as well, wait I will edit the answer

iamabhaykmr Over a year ago

you can use scrollToPosition() method for recycler view which works like setSelection() method of listview

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