findViewByPosition() of recyclerview shows null after notifydatasetChanged()

Question

I have recyclerview in that i need to color 1st item's button.

so that I use following way,after notifyDataSetChanged()

View viewItem = rvProductList.getLayoutManager().findViewByPosition(0);

but viewItem is getting null.

Is there any way of getting first items position?

this is because first item is already recycled (not visible) — pskink, Jan 04 '18 at 08:13
if you want to find the position of the first fully visible item, you can use int firstCompleteleyVisibleItemPosition = layoutManager.findFirstCompletelyVisibleItemPosition(); Check this SO [answer](https://stackoverflow.com/a/25053500/5392118) — Burak Cakir, Jan 04 '18 at 08:47

Truong Giang Dam · Answer 1 · 2018-01-04T08:31:10.417

1

Maybe the view at position 0 is recycled at certain position. If you want to test it clearly. Check null viewItem in two case:

Scroll your recycle view up to top, when you can see the 1st item. Then call this and check null
```
View viewItem = rvProductList.getLayoutManager().findViewByPosition(0);
```
Scroll down till 1st item being invisible to you, take action like case 1 and check null again.

UPDATE SOLUTION: Solution is set the flag to know when you want to color 1st item. And in onBindViewHolder() method do this

@Override public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    // I suppose that flag is true then we color 1st item
    if(position == 0 && flag) {
        // color your button here
    } else {
       // ...
    }
}

Hope it help!

edited Jan 04 '18 at 08:31

answered Jan 04 '18 at 08:18

Truong Giang Dam

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I wanted to do it from activity – Anamika Chavan Jan 04 '18 at 10:01
sorry about late reply. you can control that logic by update flag value from your activity. set it's value is true/false and call notifyDataSetChanged – Truong Giang Dam Jan 08 '18 at 07:31

findViewByPosition() of recyclerview shows null after notifydatasetChanged()

1 Answers1