更新RecyclerView适配器项而不调用OnCreateViewHolder

Question

how to update ReyclerView adapter without make OnCreateViewHolder(...) being called?

Because when i do

mRecyclerView.getAdapter().notifiItemChanged(position)

it goes inside OnCreateViewHolder(...) what i don't want to. The reason why i don't want is because I have expanded item view and onCreateViewHolder(...) will reinflate it so make collapsed. I only want to OnBindViewHolder(...) being called

Have anyone faced with it?

UPD: Just found that OnCreateViewHolder(...) is called only one first time, in all next times it's not being called. What is the reason? t

Answer 1

This is the whole point of RecyclerView : it handle a pool of view holders, which are created once (calling OnCreateViewHolder() ) then reused (or recycled, hence the view name) as much as possible via OnBindViewHolder() .

OnCreateViewHolder() is used to create the views, while OnBindViewHolder (re)set the views state (like text content, selected state, ...)

It follows that any state associated with an item (like the expanded / collapsed state) should not be stored in the ViewHolder . You can for example use a private List in the adapter.

Answer 2

You could add a boolean isExpanded to your data objects in your dataset, and then in the onBindViewHolder method check whether isExpanded is true , if so expand the view programmatically. (and ofcourse don't forget to switch the boolean when expanding/collapsing the view)