如何在不滚动到顶部的情况下将新项目添加到recyclerview

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

Answer 1

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

Answer 2

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