recyclerView android上只能点击一项

Question

I've a recycler view on my app. I'd like to prevent multi selections on my recyclerView, because I'm getting unexpected output while trying to delete items.

        holder.mView.setOnClickListener(v -> {
        if (null != mListener) {
            mListener.onPreviewItemClicked(position);

            if (holder.isSelected) {
                holder.mView.setBackgroundColor(Color.TRANSPARENT);
                Log.d("positionClicked adapter",position+"");
                holder.isSelected = false;
                isSelected = holder.isSelected;
            } else {
                holder.mView.setBackgroundColor(ContextCompat.getColor(mContext, (R.color.accent_light)));
                holder.isSelected = true;
                positionClicked = position;
                isSelected = holder.isSelected;
            }
        }
    });

On my code, I use is Selected boolean to catch if something is clicked. When I click on an item, background of its changes. The thing is :

If I click on item1, then on item2, both items have backgrounds changed, and I'd like to have only one. And when I click on item, code below is done. But then, If i click again on item2, it goes transparent, which is good ! But the position of my item selected is wrong ( should be 1, but it's 2 because last item selected was 2). So when I delete, it will delete 2nd item and not first one...

I delete using positionClicked variable.

Any idea on how to fix this ?

Answer 1

You should keep if item is selected in your model, and use it in the onBindViewHolder to setup background for the ViewHolder. In OnClickListener just set true for the specific data item, false for all others and then call notifyDataSetChanged() to rebinf all items.