Force RecyclerView to redraw its items

Question

Is there any way to redraw all items of RecyclerView?

I have some Themes (in style.xml) and after changing the theme, I need the RecyclerView to be redrawn.

So I want a method that will force to re-call onCreateViewHolder for each items of the adapter.

I tried to:

• call adapter.notifyDataSetChanged but onCreateViewHolder is not called
• call recyclerView.setVisibility(View.GONE) and then recyclerView.setVisibility(View.VISIBLE)
• call recyclerView.invalidate()
• call recyclerView.setAdapter(null) and then recyclerView.setAdapter(adapter).
  This works well for 90% items. Only 90% of items will get the new style, but some items will have the old style

I mention that the RecyclerView is attached to an Activity, not to a Fragment.

Answer 1

I found the answer! The correct way to do this is:

recyclerView.setAdapter(null); recyclerView.setLayoutManager(null); recyclerView.setAdapter(myAdapter); recyclerView.setLayoutManager(myLayoutManager); myAdapter.notifyDataSetChanged(); 

After that, all the items are getting the new style!

Answer 2

Simply setting recyclerview's adapter again worked for me (I wanted RecyclerView to redraw all items' layout again)

/**  * Forces RecyclerView adapter to call createViewHolder() - i.e. redraw all all items' layouts  */ private fun resetAdapterState() {     val myAdapter = recyclerView.adapter     recyclerView.adapter = myAdapter }