Update an item view in RecyclerView

Question

I have a RecyclerView which is getting list of favourite and Unfavourite item. There is a Star icon in the item onClick of which i am calling an API which return added to favorite or removed from favourite. Now i am Trying to update star icon in the RecyclerView

OnSuccess of my task i am updating my list with this code

adapterParcel.notifyItemChanged(position, modelParcelsArrayList);
                        adapterParcel.notifyDataSetChanged();

In my Adapter onBindViewHolder i am trying to update view by this code

if (singleModelParcels.is_favouriteParcel()) {
                itemListHolder.rpl_iv_favorite.setBackgroundResource(R.drawable.ic_action_fav_yellow);
            } else {
                itemListHolder.rpl_iv_favorite.setBackgroundResource(R.drawable.ic_action_fav_white);
            }

I am unable to figure out what should i do to update View of that item.

Answer 1

The notifyDataSetChanged method refreshes the items in the recyclerView adapter ie . they again go through the onBindViewHolder state.

if you have modified you object properly to hold the fav value (true/false) then inside the onBindViewHolder you can simple access that value an set the view, something like this:

 @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {
   Object object = objectList.get(position);
   if (object.isFav()){
     holder.favIcon.highlight();
   }else{
     holder.favIcon.unhighlight();
   }
}

So all you have to do is call the notifyDataSetChanged method on the adapter and the code inside the onBindViewHolder mthod will handle it for you!

Check a similar project created by me, here

Answer 2

您也可以通过使用notifyItemChanged实现相同的功能，但是在这种情况下，您将需要在该位置更新实体，这将刷新适配器中的视图。