recycleview + checkbox 实现单选

private HashMap<Integer,Boolean> positionMap;

positionMap = new HashMap<>();
for(int i=0;i<imgSelectorFolderBeans.size();i++){
    positionMap.put(i,false);
}

 holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                for(int i=0;i<imgSelectorFolderBeans.size();i++){
                    positionMap.put(i,false);
                }
                holder.folderPopCheckbox.setChecked(true);
                positionMap.put(position,true);
                notifyDataSetChanged();//一定要刷新，否则会出现多选现
            }
        });