RecyclerView updates only on scroll

Question

I have a layout with a RecyclerView with the adapter:

public class SimpleRecyclerAdapter extends RecyclerView.Adapter<SimpleViewHolder> { protected List<JSONObject> data = new ArrayList<>(); public List<JSONObject> getData() { return data; } }

I update it's adapter like:

public void udpdateFromJson( JSONObject payload ) { JSONArray msgs = payload.optJSONArray( "messages" ); for( int ix = 0; null != msgs && ix < msgs.length(); ix++ ){ JSONObject o = msgs.optJSONObject( ix ); if( loadingMore ) adapter.getData().add( 1 + ix, o ); else adapter.getData().add( o ); } adapter.notifyDataSetChanged(); recyclerView.invalidate(); }

The problem is, that I get to see the new item only when I touch or scroll the view.

What am I missing?

UPDATE:

to fix the problem I replaced the lines

adapter.notifyDataSetChanged(); recyclerView.invalidate();

with

adapter.notifyItemRangeInserted( loadingMore ? 1 : 0, msgs.length() );

and it worked

RadekJ · Accepted Answer · 2020-03-22 08:17:47Z

Most likely you are calling notifyDataSetChanged from background thread.

Simply (and ugly) fix you can do is to use:

recyclerView.post(new Runnable(){ @Override public void run(){ adapter.notifyDataSetChanged(); } });

If notifyDataSetChanged is called correctly from main thread then the list is updated without touching it.

Newbiee · Accepted Answer · 2016-07-01 08:55:25Z

try specifying the position of the item inserted or removed instead of notifyDataSetChanged();. you can use

notifyItemInserted(int pos); notifyItemRangeChanged(int start, int end);`

Rajesh N · Accepted Answer · 2018-05-19 09:14:51Z

One possible solution is use Realm Adapter. Thant will manage your scroll view position based on insert/update/delete automatically. There is no flickering effects. Drawback is you have extend Object as Realm Object.

HARSHIT GUPTA · Accepted Answer · 2018-05-19 09:22:06Z

As the question is already answered you can use one more line to scroll to the last position of your recyclerView using:

recyclerView.smoothScrollToPosition(msgs.length()-1)

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