强制 RecyclerView 重绘其项目

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
}

Answer 3

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

Answer 4

The below lines of code did the trick for me

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

Answer 5

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.

Answer 6

重置适配器对我有用，我在onConfigChange内部调用了这个

myRecyclerView.setAdapter(myAdapter)

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!

Answer 8

Take a look at this answer: https://stackoverflow.com/a/33342314/4142087

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://stackoverflow.com/a/14367214/4142087

Answer 9

This works for me:

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

It shows blank if running without post{}

Answer 10

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

Answer 11

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.