android listview 加载radiogroup，显示混乱的问题解决方法

问题描述：单选结果会混乱显示，如，选中123item，滑动时可能会显示到其他的item上。

解决思路：当你选中1，2，3 item时，滑动到下一页，下一页的1，2。3  item会默认显示选中效果，一个屏幕显示10个item，下一页11,12,13item会有显示效果

方法：当滑动listview时，每出现一个item，radiogroup都要清理原来的效果，

 holder.rgCallLevel.setOnCheckedChangeListener(null);
        holder.rgCallLevel.clearCheck();
        CallLevelInfo info = list.get(position);
        if (info.getType() == 1){
            holder.firstlevel.setChecked(true);
        }else if (info.getType() == 2){
            holder.secindlevel.setChecked(true);
        }else {
            holder.rgCallLevel.clearCheck();

        }

        holder.rgCallLevel.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                // TODO Auto-generated method stub

                Log.e(TAG, "onCheckedChanged: " );
                switch (checkedId){
                    case R.id.rb_firstlevel:
                      
                        group.check(R.id.rb_firstlevel);
                        CallLevelInfo info1 = list.get(position);
                        info1.setType(1);
                        notifyDataSetChanged();
                        Log.e(TAG, "onCheckedChanged 1: "+list.get(position).getNum() );
                       
                        break;
                    case R.id.rb_secondlevel:
                       
                        group.check(R.id.rb_secondlevel);
                        CallLevelInfo info2 = list.get(position);
                        info2.setType(2);
                        notifyDataSetChanged();
                        Log.e(TAG, "onCheckedChanged 2: "+list.get(position).getNum() );
                       
                        break;
                    default:break;

                }

            }
        });
//        holder.rgCallLevel.setOnClickListener(new View.OnClickListener() {
//            @Override
//            public void onClick(View v) {
//                RadioGroup group = (RadioGroup) v;
//
//
//        }
//        });
        return convertView;
    }



    class ViewHolder {
        private TextView tvSickBed;
        private RadioGroup rgCallLevel;
        private RadioButton firstlevel;
        private RadioButton secindlevel;

        public ViewHolder(View view) {
            tvSickBed = (TextView) view.findViewById(R.id.tv_sickbed);
            rgCallLevel = (RadioGroup) view.findViewById(R.id.rg_calllevel);

           firstlevel = (RadioButton)view.findViewById(R.id.rb_firstlevel);
            secindlevel = (RadioButton)view.findViewById(R.id.rb_secondlevel);
        }
    }