拒绝RecyclerView嵌套RecyclerView,实现复

2019-01-23  本文已影响0人  LemZ

原创内容,转载请注明出处:https://www.jianshu.com/p/3e71a15b11cc

前言

很尴尬,前段时间比较忙,加上自己又比较懒,很久没来逛逛了,现在有点时间,来记录一下。
直入主题,相信做软件开发的朋友们,经常会遇到一些复杂列表的需求,比如电商类应用的购物车或者订单界面,需要列表显示商铺名称及对应商铺下的商品,如下图:


购物车.png 订单.png

很容易想到通过RecyclerView嵌套RecyclerView实现多级列表,但这样实现会引发很多问题,滑动卡顿,焦点冲突,我有遇到过反复滑动后,页面无法正常滑动至顶部,自动回到滑动前位置(ps:设置子recyclerView不抢占焦点,recyclerView.setFocusable(false) 可解决),所以遇到类似需求,尽量不要使用RecyclerView嵌套去实现,提升用户体验。

处理思路

既然RecyclerView嵌套RecylerView存在这么多问题,那我只用一个RecyclerView去实现可不可以?当然可以!
一般碰到这种复杂列表,后台返回数据结构也会分为两层,就拿上图的订单界面举例,会返回一个订单数组,然后每个数组里面包含创建时间、订单状态、商品等字段,商品又是一个数组,包含每个商品的详细信息,我们获取到后台返回数据后,需要自己处理数据结构,将商品里的字段移到与创建时间字段平级,再通过recyclerView的加载多布局,实现显示效果。

实现方式

首先 定义一个数据处理类OrderDataHelper,专门用来修改数据结构,根据页面定义所需的数据模型,这里我分为头部信息、商品信息、底部金额信息,代码如下:

/**
 * 描述:  订单数据处理帮助类
 * 作者:  LemZ
 * 创建时间:  2018-05-29 09:39
 */

public class OrderDataHelper {

    /**
     * List<Object>有三种数据类型:
     * 1、OrderHeaderInfo 表示每个订单的头部信息(订单号、订单状态、店铺名称)
     * 2、orderProductInfo 表示订单中的商品
     * 3、OrderPayInfo 表示订单的支付信息(金额、订单状态)
     *
     * @param resultList
     * @return
     */
    public static List<Object> getDataAfterHandle(List<OrderListBean> resultList) {

        List<Object> dataList = new ArrayList<Object>();
        //遍历每一张大订单
        for (OrderListBean orderListBean : resultList) {
            //订单编号 订单状态
            OrderHeaderInfo orderHeadInfo = new OrderHeaderInfo();
            orderHeadInfo.setOrderCode(orderListBean.getOrderCode());
            orderHeadInfo.setOrderStatus(orderListBean.getOrderStatus());
            orderHeadInfo.setId(orderListBean.getId());
            orderHeadInfo.setCreateTime(orderListBean.getCreateTime());

            List<OrderProductInfo> orderProductList;
            //订单商品
            orderProductList = orderListBean.getOrderProducts();

            //订单支付的金额和邮费金额
            OrderPayInfo orderPayInfo = new OrderPayInfo();
            orderPayInfo.setPostageAmount(orderListBean.getPostageAmount());
            orderPayInfo.setTotalAmount(orderListBean.getTotalAmount());
            orderPayInfo.setId(orderListBean.getId());
            orderPayInfo.setGoodsCount(orderListBean.getOrderProducts().size());
     
            dataList.add(orderHeadInfo);
            if(orderProductList != null){
                 for(int i = 0; i < orderProductList.size(); i++){
                      dataList.add(orderProductList.get(i));
                 }
            }
            dataList.add(orderPayInfo);
        }
        return dataList;
    }
}

,将处理后数组 赋予适配器,刷新显示界面

dataList = OrderDataHelper.getDataAfterHandle(data.getList());  //定义的全局List<Object> dataList
mAdapter.refresh(dataList,isLoadMore);

适配器添加多布局显示处理:

/**
 * 描述:
 * 作者:  LemZ
 * 创建时间:  2018-05-28 17:01
 */

public class OrderAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{

    private int ITEM_HEADER = 1, ITEM_CONTENT = 2, ITEM_FOOTER = 3;
    private List<Object> dataList;
    private Context context;

    public final void refresh(List<Object> data,boolean isLoadMore) {
        if (!isLoadMore)
            dataList.clear();
        dataList.addAll(data);
        notifyDataSetChanged();
    }

    public OrderAdapter(Context context,List<Object> list) {
        this.context = context;
        this.dataList = list != null ? list : new ArrayList<>();
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view;
        if (viewType == ITEM_HEADER){
            view = LayoutInflater.from(context).inflate(R.layout.item_order_header, parent, false);
            return new HeadViewHolder(view);
        }else if (viewType == ITEM_CONTENT){
            view = LayoutInflater.from(context).inflate(R.layout.item_order_content, parent, false);
            return new ContentViewHolder(view);
        }else if(viewType == ITEM_FOOTER){
            view = LayoutInflater.from(context).inflate(R.layout.item_order_footer, parent, false);
            return new FootViewHolder(view);
        }
        return null;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, final int position) {
        /**头部*/
        if (getItemViewType(position) == ITEM_HEADER) {
            final HeadViewHolder headerHolder = (HeadViewHolder) viewHolder;
            OrderHeaderInfo orderHeadInfo = (OrderHeaderInfo)dataList.get(position);

            showText(headerHolder.tv_order_create_time,orderHeadInfo.getCreateTime())
            showText(headerHolder.tv_order_status,orderHeadInfo.getOrderStatus())
        }
        /**商品信息*/
        else if (getItemViewType(position) == ITEM_CONTENT) {
            final ContentViewHolder contentHolder = (ContentViewHolder) viewHolder;
            final OrderProductInfo orderProductInfo= (OrderProductInfo)dataList.get(position);

            showText(contentHolder.tv_good_name,orderProductInfo.getProductName());

            contentHolder.tv_product_price.setText("¥"+NumberUitls.kp2Num(orderProductInfo.getProductPrice()));
            contentHolder.tv_product_count.setText("x"+orderProductInfo.getProductCount());

            showText(contentHolder.tv_good_spec,orderProductInfo.getProductSpec());
            
            Glide.with(context).load(orderProductInfo.getProductPic())
                    .dontAnimate()
                    .error(R.mipmap.ic_default)
                    .placeholder(R.mipmap.ic_default)
                    .into(contentHolder.iv_good);
        }

        /**尾部*/
        else if (getItemViewType(position) == ITEM_FOOTER) {
            final FootViewHolder footHolder = (FootViewHolder) viewHolder;
            OrderPayInfo orderPayInfo = (OrderPayInfo)dataList.get(position);

            footHolder.tv_postage_amount.setText("¥"+NumberUitls.kp2Num(orderPayInfo.getPostageAmount()));
            footHolder.tv_order_amount.setText("¥"+NumberUitls.kp2Num(orderPayInfo.getTotalAmount()));
            footHolder.linear_fold_status.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    changeFold(orderPayInfo,footHolder,footHolder.tv_fold_status,footHolder.iv_arrow);
                }
            });
            footHolder.tv_goods_num.setText("共"+orderPayInfo.getGoodsCount()+"件商品,");

        }

    }

    @Override
    public int getItemCount() {
        return dataList == null?0:dataList.size();
    }

    @Override
    public int getItemViewType(int position) {
        if (dataList.get(position) instanceof OrderHeaderInfo){
            return ITEM_HEADER;
        }else if (dataList.get(position) instanceof orderProductInfo){
            return ITEM_CONTENT;
        }else if(dataList.get(position) instanceof OrderPayInfo){
            return ITEM_FOOTER;
        }
        return ITEM_CONTENT;
    }

    public class HeadViewHolder extends RecyclerView.ViewHolder{
        TextView tv_order_create_time;
        TextView tv_order_status;

        public HeadViewHolder(View itemView) {
            super(itemView);
            tv_order_create_time = (TextView)itemView.findViewById(R.id.tv_order_create_time);
            tv_order_status = (TextView)itemView.findViewById(R.id.tv_order_status);
        }
    }

    public class ContentViewHolder extends RecyclerView.ViewHolder{
        TextView tv_good_name;
        TextView tv_product_price;
        TextView tv_product_count;
        ImageView iv_good;
        TextView tv_good_spec;

        public ContentViewHolder(View itemView) {
            super(itemView);
            tv_good_name = (TextView)itemView.findViewById(R.id.tv_good_name);
            tv_product_price = (TextView)itemView.findViewById(R.id.tv_product_price);
            tv_product_count = (TextView)itemView.findViewById(R.id.tv_product_count);
            iv_good = (ImageView)itemView.findViewById(R.id.iv_good);
            tv_good_spec = (TextView)itemView.findViewById(R.id.tv_good_spec);
        }
    }

    public class FootViewHolder extends RecyclerView.ViewHolder{
        LinearLayout linear_fold_status;
        TextView tv_fold_status;
        TextView tv_postage_amount;
        TextView tv_goods_num;
        TextView tv_order_amount;
        ImageView iv_arrow;

        public FootViewHolder(View itemView) {
            super(itemView);
            linear_fold_status = (LinearLayout)itemView.findViewById(R.id.linear_fold_status);
            tv_fold_status = (TextView)itemView.findViewById(R.id.tv_fold_status);
            tv_postage_amount = (TextView)itemView.findViewById(R.id.tv_postage_amount);
            tv_goods_num = (TextView)itemView.findViewById(R.id.tv_goods_num);
            tv_order_amount = (TextView)itemView.findViewById(R.id.tv_order_amount);
            iv_arrow = (ImageView)itemView.findViewById(R.id.iv_arrow);
        }
    }

/**
字符串为空判断
*/
private void showText(TextView tv, String str){
        if(!TextUtil.isEmpty(str)){
              tv.setText(str);
        }else {
              tv.setText("");
        }
    }

}

总结

这样就实现了一个RecyclerView显示复杂布局的效果,试试?滑动流畅得飞起!
(原本计划再写一篇ScrollView嵌套,想想还是简单分享下思路好了。很多朋友可能会选择使用NestedScrollView嵌套RecyclerView,设置recyclerView.setNestedScrollingEnabled(false);避免卡顿,这样依然会存在问题,如RecyclerView自动获取焦点,进入页面只显示RecyclerView部分。通常遇到这种自定义布局与列表共存的界面,我会采用RecyclerView添加header、footer布局的方式去实现,滑动更流畅!在这里也推荐一个非常强大的适配器框架https://www.jianshu.com/p/b343fcff51b0/,轻松实现添加头尾部)
本文如有不足之处,欢迎各位指出,我会及时更正 ^ ^

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