取出物品时如何在回收站适配器中保持位置？

Question

I have a recycler adapter, in the view item there is a delete button (del). I use the following code in click event.

@Override
public void onBindViewHolder(ViewHolder holder, int position) 
{   
    holder.del.setTag(position);
    holder.del.setOnClickLintener(new View.OnClickListener() {

        @Override
        public void onClick(View v)
        {
            int pos= (int) v.getTag();
            //remove view item
            notifyItemRemoved(pos);
            //remove equivalent arraylist item
            listitems.remove(pos);  
        }
    });
}

This does not update the tag values in the view items i assume because the onBindViewHolder() is not called for the already existing items. How can i update the values or is there a different approach to this.

Answer 1

You have to remove the item from the list and then you have to call notifyItemRemoved(pos) .

@Override
public void onBindViewHolder(ViewHolder holder, int position) 
{   
    holder.del.setTag(position);
    holder.del.setOnClickLintener(new View.OnClickListener() {

        @Override
        public void onClick(View v)
        {
            int pos = (int) v.getTag();
            //remove equivalent arraylist item
            listitems.remove(pos);  
            //remove view item
            notifyItemRemoved(pos);


           new Handler().postDelayed( new Runnable(){
                @override
                void run(){
                notifyDatasetChanged ()
               }
            },400);

        }
    });
}

Hope it helps:)

Answer 2

Don't use the position as the tag if you want to use notifyItemRemoved and keep the removing animation. Use the Object in your items as the tag and find it when you need the index.

@Override
public void onBindViewHolder(ViewHolder holder, int position) 
{   
    Object item = listitems.get(position);
    holder.del.setTag(item);
    holder.del.setOnClickLintener(new View.OnClickListener() {

        @Override
        public void onClick(View v)
        {
            Object item = (Object) v.getTag();
            int pos = listitems.indexOf(item);
            if (pos >= 0) {
             //remove equivalent arraylist item
             listitems.remove(pos);
             //remove view item
             notifyItemRemoved(pos);
           }   
        }
    });
}