Recyclerview：隐藏项目而不将它们从 ArrayList 中删除

Question

I've been searching for that for quite a while and haven't found a proper answer:

Is there a way to remove an Item from a RecyclerView without removing it from the underlying ArrayList? I want to add a functionality, to temporarily hide Items from the List, when a certain condition is true. I still need those items back later, but managing 2 separate ArrayList seems overly complicated. If I set the Visibility of the Item inside the Adapter to gone , I have a visible gap where the item was, so that is not a solution.

Is there any way by which I can avoid managing 2 separate ArrayLists?

Answer 1

I think you'll have to actually remove from the data model. Otherwise, you'll either end up with blank rows, as you say, or when you scroll, the "hidden" recycled elements will get jumbled up.

Just because you remove from the the Arraylist doesn't mean you can't add another list to (temporarily) store the items that were removed.

For example, define this in the adapter

private List<Item> removed = new ArrayList<>();

public void remove(int position) {
    removed.add(items.get(position));
    items.remove(position);
    notifyDataSetChanged();
}

If you need better functionality about which items you have removed, a Hashmap may be better.

Answer 2

you have an ArrayList of object type You have a model/pojo class of Object type

while iterating JsonData from JsonResponse just pass boolean value true/false in object type Model class. The data you want to show make it true else false, later you can set the 'false value to true' to your Model class.

Hope this will work.

Answer 3

就我而言，我使用的是getApplicationContext()而不是getContext或this