android notifyItemRangeInserted disable autoscroll

Question

I'm using RecyclerView as the base for my data list. i've implemented custom RecyclerView.Adapter which is based on ArraList. on fetching data from the internet the code that i'm running is:

public void addItems(List<Item> items){

    final int size = data.size();
    data.addAll(items);
    notifyItemRangeInserted(size, items.size());
}

Problem is that for after running this code i'm getting an autoscroll to the bottom of the list (last element is now visible)

Is there a way to disable this? couldn't find any similar questions.

relevant information: my adapter have 2 viewHolders - for position 0 it has a view (with viewType 0) and for the rest of list it has view with viewType 1

Thanks for your help!

Roy

thanks for your help. i tried it now, it's not working. also i'm not crazy about post insert solution because it can start scrolling a little before stopScroll is running. but anyhow it's not working /-: — royB, Nov 22 '14 at 17:21
check if you have somewhere scrollToPosition called since by default RecyclerView doesn't do auto scrolling — pskink, Nov 22 '14 at 17:27
No, i have no scrollToPosition. it's weird i've also checked the code for notifiyRangeItemInserted and no indication for autoscrolling — royB, Nov 22 '14 at 17:29
strange, i had to explicitly call scrollToPosition to see my inew items, anyway did you try old school style notifyDataSetChanged()? — pskink, Nov 22 '14 at 17:38
yep. it's working. but doc say that i should use it as last resource. my list can have a lot of data an i hate to think about the penalty for redrawing on data load /-: — royB, Nov 22 '14 at 17:44
there shouldn't be any penalty, only you will not be seeing that fancy insert animations if you have any — pskink, Nov 22 '14 at 17:59
which layout manager are you using? maybe you've set reverseLayout=true by mistake ? — yigit, Nov 22 '14 at 19:35
yes...it was an error on my behalf...i should remove this question — royB, Feb 23 '15 at 14:04

localhost · Accepted Answer · 2015-07-28T12:46:30.327

36

Problem is in your positionStart. Should be:

public void addItems(List<QuestItem> items){    
    final int positionStart = data.size() + 1;
    data.addAll(items);
    notifyItemRangeInserted(positionStart, items.size());
}

edited Jul 28 '15 at 12:46

answered May 26 '15 at 10:19

localhost

5,432
1
30
50

yeah well...as you can see i've added a comment which say so (from feb 23). thanks anyhow mate! – royB May 26 '15 at 10:21
3

@localhost @royB As per the doc, `positionStart`is the position of the first item that was inserted. So shouldn't it be `data.size()` coz that is where the first item was inserted? :p – Abhishek V Jul 28 '15 at 12:45
@AbhishekV yep :D But regarding this question it should be +1 – localhost Jul 28 '15 at 12:46
@localhost Thanks for the update. I am not sure though. let me know if it is otherwise :) – Abhishek V Jul 28 '15 at 12:51
3

@AbhishekV 0 position is his VIEW_TYPE_0, so you have to +1 – localhost Jul 28 '15 at 12:52
Thanks mate! solved another issue for me! I was using `postionStart = data.size()` – rgv Aug 20 '15 at 04:18
@AbhishekV Well I guess the VIEW_TYPE_0 is a static header and isn't managed in `data`, hence the +1. – Marc Plano-Lesay Sep 03 '15 at 08:42

android notifyItemRangeInserted disable autoscroll

1 Answers1

Linked