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.

Dutch

Make sure you call notifyDataSetChanged() from the UI thread, it should work. – Chemosynthesis

@Chemosynthesis notifyDataSetChanged only force onBindNewHolder, not onCreate – Bourgeois

Sorry, im not familiarized with the viewHolder pattern but i will say that you should adapt your code to work with it (or dont use it). – Chemosynthesis

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!

Dutch

adapter.doYourStaff();recyclerView.setAdapter(adapter); This 2 lines of code is enough! – Thailand

recyclerView.setAdapter(adapter) is enough for me. – Mission

This worked for me too except I didn't need the first two lines (i.e. null assignments). – Cullie

I checked recyclerView and myAdapter for not being null before applying and works fine – Fabrizio

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
}

Selfcontrol

Or, for Java RecyclerView.Adapter adapter = myRecyclerView.getAdapter(); myRecyclerView.setAdapter(adapter); – Dejected

Probably the best answer :) – Merilyn

I would add recyclerView.adapter = null before recyclerView.adapter = myAdapter to call onDetachedFromRecyclerView() on adapter automaticlly – Interactive

Thanks. For me, only working answer. I changed code to recyclerView.setAdapter(recyclerView.getAdapter()); Or, more simply, set Adapter again: recyclerView.setAdapter(mMyAdapter); – Patman

Answer 3

If you want to force redraw, you need clear View Pool of RecycleView. You can use recyclerView.getRecycledViewPool().clear();

Generous

ViewHolders still not re-drawn after i call clear. Even if i call notifyDataSetChanged. Somehow still cached viewholders are re-used.. – Elute

Answer 4

The below lines of code did the trick for me

recyclerview.swapAdapter(myAdapter,false);
recyclerview.setLayoutManager(myLayoutManager);
myAdapter.notifyDataSetChanged();

Jaynes

Answer 5

Resetting the Adapter worked for me, I called this inside onConfigChange

myRecyclerView.setAdapter(myAdapter)

Photocathode

This answer worked for me when I needed to remove selections after exiting a multi-selection mode. I notified the related fragment through an interface method, inside of which I reset the adapter as this answer suggests. – Botany

Answer 6

I know this is old, but I had a situation where I needed to change the viewholder types after notifyDataSetChanged(). If the adapter already had data, onCreateViewHolder was not being called because of the "recycle" part of recycleviewadapter, so a type cast error was being thrown in onBindViewHolder.

I was able to solve this by calling myRecyclerView.getLayoutManager().removeAllViews(); before calling notifyDataSetChanged(); on the adapter.

Homologize

Answer 7

The only solution that worked for me on an Amazon Fire HD was this:

recyclerView.setAdapter(null);
recyclerView.setLayoutManager(null);
recyclerView.getRecycledViewPool().clear();
recyclerView.swapAdapter(myAdapter, false);
recyclerView.setLayoutManager(layoutManager);
myAdapter.notifyDataSetChanged();

Hope it helps!

Taxis

Answer 8

Take a look at this answer: https://mcmap.net/q/331006/-force-recyclerview-to-call-oncreateviewholder

Shortly, you can create different types of view holders, changing view type will force RecyclerView to pass another ViewHolder to the onBindViewHolder.

If you use setTheme, you have to recreate whole Activity like this: https://mcmap.net/q/143666/-how-to-change-current-theme-at-runtime-in-android-duplicate

Bourgeois

If thats how this shoud be done that viewholder pattern doesnt look as the cleanest. – Chemosynthesis

@DenisCovaci Try to save data in the instance state and recreate activity – Bourgeois

Answer 9

This works for me:

recyclerView.adapter = recyclerView.adapter
recyclerView.post {
    recyclerView.adapter?.notifyDataSetChanged()
}

It shows blank if running without post{}

Serigraph

Doing recyclerView.adapter = recyclerView.adapter without notifyDataSetChanged() worked for me. – Sophisticated

Answer 10

Redraw the Recycler again Kotlin:

viewLifecycleOwner.lifecycleScope.launch {
                   delay(3000L)
                   binding.recyclerView.adapter.also {
                       binding.recyclerView.adapter = null
                       binding.recyclerView.adapter = it
                   }

Januarius

Please read "How to Answer" and "Explaining entirely code-based answers". It helps more if you supply an explanation why this is the preferred solution and explain how it works. We want to educate, not just provide code. – Ladybird

Answer 11

Force RecyclerView to onCreateViewHolder or redraw its items #Kotlin

This worked for me 🙂

        this.runOnUiThread {
            val adapter = recyclerView.adapter
            val layoutManager = recyclerView.layoutManager
            recyclerView.adapter = null
            recyclerView.layoutManager = null
            recyclerView.adapter = adapter
            recyclerView.layoutManager = layoutManager
            adapter!!.notifyDataSetChanged()
        }

hope this can help

Hanaper

You should add that this case works for code execution (callback method) from background. Reason your code would not work is for callback being executed in different thread then main. – Redmon

Answer 12

After trying most of the ideas here - if turns out that my issue was down to using a simulator. When testing on devices I've had no issues with this.

Comptroller