Force RecyclerView to redraw its items

问题

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.

回答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!

回答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
}

回答3:

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

回答4:

The below lines of code did the trick for me

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

回答5:

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!

回答6:

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

回答7:

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.

来源：https://stackoverflow.com/questions/36495009/force-recyclerview-to-redraw-its-items