Recyclerview调用notifyItemChanged导致空白项目

Question

RecyclerView calls notifyItemChanged() to cause a blank entry

I have a RecyclerView and it's every child item has a RecyclerView , when the dataset of RecyclerView in child item has changed (eg.some item inserted). I try to call the parent RecyclerView 's notifyItemChanged() to refresh it. But when I call that function, it will cause a blank item below.

mMessagesAdapter.notifyItemChanged(position);

when I call notifyItemChanged() for a position, there will be a blank item below, it can be visible, but there is no data, and it's all white.

Demo： https://github.com/zoodeveloper/NestBug

Answer 1

The adapter.notifyItemChanged () is used for refreshing an existing item. If you are adding a new item, then you should call adapter.notifyItemRangeChanged(position, data.size())

Answer 2

If you are inserting a new item you can use notifyItemInserted (int position)

It is used to notify any registered observers that the item reflected at position has been newly inserted. The item previously at position is now at position position + 1.

Answer 3

Maybe you should consider to call adapter.notifyItemChanged() from the main thread.

Handler mainHandler = new Handler(Looper.getMainLooper());

Runnable myRunnable = new Runnable() {
   @Override 
   public void run() { adapter.notifyItemChanged() } 
};
mainHandler.post(myRunnable);