大侠请进，android listview添加单选按钮。为什么总是多选解决方法

@Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        GridHolder holder;  
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.item_repairshow, null);     
            holder = new GridHolder();  
            holder.rbSelect=(RadioButton)convertView.findViewById(R.id.rbSelect);//单选钮 

            convertView.setTag(holder);
        }else{
            holder = (GridHolder) convertView.getTag(); 
        }  
        
        HashMap<String,Object> info = items.get(position);

        if (info != null) {
                holder.rbSelect.setOnClickListener(new lvButtonListener(position,CommonMethod.HANDLER_RADIOBUTTON));
            holder.rbSelect.setChecked((Boolean)info.get("Selected"));
        }
        
        return convertView;
    }

class lvButtonListener implements View.OnClickListener {
        private int position;
        private int type;

        lvButtonListener(int pos,int type) {
            position = pos;
            this.type=type;
        }
        
        @Override
        public void onClick(View v) {
            Message msg = handler.obtainMessage();
            msg.what = type;
            msg.arg1 = position;
            handler.sendMessage(msg);
        }
    }