如何将 ArrayList 大小从 onBindViewHolder 传递给 RecyclerView 中的 getItemCount() 方法？

Question

I have this array inside onBindViewHolder method like that.

checklistHelper =  dbHelper.getChecklists(id);
                String status = checklistHelper.getStatus();
                String[] statusSplit = status.split("\n");
                ArrayList<String> newStatusList = new ArrayList<>(Arrays.asList(statusSplit));
                newStatusList.remove(position);
                notifyItemRemoved(position);
                int size =  newStatusList.size();

I want to pass size to below method

@Override
    public int getItemCount() {

        return size;

By doing that getItemCount won't get any values in it, this means I don't see any item. If I want to put that code in the Adapter constructor the items get showed, but after deleting a row, the row gets recreated again. Because I can't put

newStatusList.remove(position);
notifyItemRemoved(position);

inside adapter constructor, since I can't access ViewHolder position inside adapter constructor.

Any help is appreciated.

Answer 1

You can declare int size=0; globally inside Adapter. also, create this array list when the constructor gets called. so you can have the list prepared before getItemCount() gets called.

Adaper(){
ArrayList<Integer> integers = new ArrayList<>();
        integers.add(2);
        integers.add(8);
        integers.add(2);
        integers.add(61);
        integers.add(3);
        integers.add(75);
        size = integers.size();
}

Answer 2

 checklistHelper =  dbHelper.getChecklists(id);
            String status = checklistHelper.getStatus();
            String[] statusSplit = status.split("\n");
            ArrayList<String> newStatusList = new ArrayList<>(Arrays.asList(statusSplit));
            newStatusList.remove(position);
            notifyItemRemoved(position);
         
            int size =  newStatusList.size();

@Override public int getItemCount() {

    return newStatusList.size();