今天在做项目的一个我的收藏页面时要实现这么一个效果：
每个item 前面都有一个checkbox ，主要布局是recycleview 。当我们选中某项时，继续往下滑动下面某个的checkbox也会变成选中状态。 解决方法一比较暴力 viewHolder.setIsRecyclable(false); 这样viewholder就不进行复用，也不存在checkbox 混乱选中的问题了，但是 你滑动的时候卡的要死。
第二种就是在获取到的bean中设置一个标志位，但是需要修改bean 。虽然只是加个字段的问题，但是不建议。
第三种就是用个辅助list记录选中的item. 这还不够，还要配合viewholder的settag（）.
1.在绑定view的时候 viewHolder.checkBox.setTag(new Integer(position));//设置tag 否则划回来时选中消失
if (checkPositionlist != null) {((MyViewHolder) holder).checkBox.setChecked((checkPositionlist.contains(new Integer(position)) ? true : false));} else {((MyViewHolder) holder).checkBox.setChecked(false);}
2.选中监听事件：
viewHolder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {MyCollectionBaseBean baseBean = data.getFavoritesList().get(position);if (isChecked) {//Log.e(“fangchao 1”, viewHolder.checkBox.getTag() + “”);if (!checkPositionlist.contains(viewHolder.checkBox.getTag())) {//这句要有 ，否则不复用了，但是你再滑动回去的时候，都成了为选中。这是因为你的item滑出可视范围时，就会触发oncheckchange事件，所以用第一步绑定的tag进行二次判断。防止选中的丢失checkeddata.add(baseBean);checkPositionlist.add(new Integer(position));}} else {//Log.e(“fangchao 2”, viewHolder.checkBox.getTag() + “”);if (checkPositionlist.contains(viewHolder.checkBox.getTag()))//这句同上，二次判断{checkeddata.remove(baseBean);checkPositionlist.remove(new Integer(position));}}}});
完整代码，自己摘着看：
/** * Created By Fangchao On 2015/3/5 */public class CollectionAdapter extends FooterAdapter {private MyCollectionListBean data;// 元数据private List<MyCollectionBaseBean> checkeddata = new ArrayList<>();// 选中的数据private ImageLoader mImageLoader;private List<Integer> checkPositionlist;public CollectionAdapter(MyCollectionListBean data) {this.data = data;mImageLoader = new ImageLoader(MyApplication.getInstance().getRequestQueue(), BitmapCache.getInstance());checkPositionlist = new ArrayList<>();}public class MyViewHolder extends RecyclerView.ViewHolder {public TextView txt_onsale, txt_mj, txt_present, goodsname, goods_describe;public TextView price, mark_price, commentsnums;CheckBox checkBox;NetworkImageView goods_img;public View v;public MyViewHolder(View v) {super(v);this.v = v;txt_onsale = (TextView) v.findViewById(R.id.txt_onsale);txt_mj = (TextView) v.findViewById(R.id.txt_mj);txt_present = (TextView) v.findViewById(R.id.txt_present);goods_describe = (TextView) v.findViewById(R.id.tv_production_describ);goodsname = (TextView) v.findViewById(R.id.tv_goods_name);price = (TextView) v.findViewById(R.id.tv_goods_price);mark_price = (TextView) v.findViewById(R.id.tv_goods_markprice);commentsnums = (TextView) v.findViewById(R.id.tv_goods_commentsnums);checkBox = (CheckBox) v.findViewById(R.id.collection_cb);goods_img = (NetworkImageView) v.findViewById(R.id.mycollection_item_image);}}@Overridepublic boolean useFooter() {return true;}@Overridepublic RecyclerView.ViewHolder onCreateContentItemViewHolder(ViewGroup parent, int viewType) {View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_collection, parent, false);MyViewHolder vh = new MyViewHolder(v);return vh;}@Overridepublic void onBindContentItemView(RecyclerView.ViewHolder holder, final int position) {MyViewHolder viewHolder = (MyViewHolder) holder;// viewHolder.setIsRecyclable(false);viewHolder.goodsname.setText(data.getFavoritesList().get(position).getGoods().getGoodsName());if (StringUtils.isBlank(data.getFavoritesList().get(position).getGoods().getGoodsSlogan())) {viewHolder.goods_describe.setVisibility(View.GONE);} else {viewHolder.goods_describe.setVisibility(View.VISIBLE);viewHolder.goods_describe.setText(data.getFavoritesList().get(position).getGoods().getGoodsSlogan());}viewHolder.price.setText(PriceTools.formatStr(data.getFavoritesList().get(position).getGoods().getShopPrice()));viewHolder.price.setTextColor(Color.parseColor(“#E5004B”));viewHolder.mark_price.setText(PriceTools.formatStr(data.getFavoritesList().get(position).getGoods().getMarketPrice()));viewHolder.mark_price.setBackgroundResource(0);viewHolder.mark_price.getPaint().setFlags(Paint.STRIKE_THRU_TEXT_FLAG | Paint.ANTI_ALIAS_FLAG); // 设置中划线并加清晰viewHolder.commentsnums.setText(data.getFavoritesList().get(position).getGoods().getCommentCount());viewHolder.checkBox.setTag(new Integer(position));//设置tag 否则划回来时选中消失//checkbox 复用问题if (checkPositionlist != null) {((MyViewHolder) holder).checkBox.setChecked((checkPositionlist.contains(new Integer(position)) ? true : false));} else {((MyViewHolder) holder).checkBox.setChecked(false);}//Log.e(“ffff”,position+””);viewHolder.goods_img.setDefaultImageResId(R.drawable.item_default_img);viewHolder.goods_img.setErrorImageResId(R.drawable.item_default_img_err);viewHolder.goods_img.setImageUrl(data.getFavoritesList().get(position).getGoods().getImgFile(), mImageLoader);if (data.getFavoritesList().get(position).getGoods().getIsOnSale().equals(“false”)) {//下架viewHolder.price.setText(“本商品已经下架”);viewHolder.price.setTextColor(Color.GRAY);viewHolder.mark_price.setText(“”);} else if (data.getFavoritesList().get(position).getGoods().isIsNoStock()) {//缺货viewHolder.mark_price.setBackgroundResource(R.drawable.ticket_is_outof_date_bg);viewHolder.mark_price.setText(” 缺货 “);viewHolder.price.setTextColor(Color.GRAY);viewHolder.mark_price.getPaint().setFlags(0);}//cb 的选中事件onchecked(viewHolder, position);}private void onchecked(final MyViewHolder viewHolder, final int position) {viewHolder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {MyCollectionBaseBean baseBean = data.getFavoritesList().get(position);if (isChecked) {//Log.e(“fcccc 1”, viewHolder.checkBox.getTag() + “”);if (!checkPositionlist.contains(viewHolder.checkBox.getTag())) {checkeddata.add(baseBean);checkPositionlist.add(new Integer(position));}} else {//Log.e(“fcccc 2”, viewHolder.checkBox.getTag() + “”);if (checkPositionlist.contains(viewHolder.checkBox.getTag())) {checkeddata.remove(baseBean);checkPositionlist.remove(new Integer(position));}}}});}@Overridepublic int getContentItemCount() {if (data != null)return data.getFavoritesList().size();else return 0;}@Overridepublic int getContentItemType(int position) {return 0;}public void getdata(MycheckListener listener) {listener.getcheckeddata(checkeddata);}public interface MycheckListener {void getcheckeddata(List<MyCollectionBaseBean> listBean);}}
，生命不在长而在于好，只要每一次尽力的演示，都值得鼓励与喝采。
