用一个RecyclerView实现仿京东、天猫的商品筛选列表

package com.plumcookingwine.tree.adapter; import android.support.annotation.NonNull; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import com.plumcookingwine.tree.ItemStatus; import com.plumcookingwine.tree.dao.TreeListDao; import java.util.ArrayList; import java.util.List; /** * Created by Kevin on 2019/1/22. * * K代表组对象， V代表子对象 */ public abstract class AbsTreeListAdapter<K, V> extends RecyclerView.Adapter<RecyclerView.ViewHolder> { private List<TreeListDao<K, V>> mTreeList; private List<Boolean> mGroupItemStatus; public AbsTreeListAdapter(List<TreeListDao<K, V>> treeList) { this.mTreeList = treeList; } public abstract int groupLayoutId(); public abstract int subLayoutId(); public abstract void onBindGroupHolder(GroupItemViewHolder holder, K k, int groupIndex, int position); public abstract void onBindSubHolder(SubItemViewHolder holder, V v, int subIndex, int groupIndex, int position); @NonNull @Override public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { LayoutInflater inflater = LayoutInflater.from(parent.getContext()); View view; RecyclerView.ViewHolder viewHolder; if (viewType == ItemStatus.VIEW_TYPE_GROUP_ITEM) { view = inflater.inflate(groupLayoutId(), parent, false); viewHolder = new GroupItemViewHolder(view); } else { view = inflater.inflate(subLayoutId(), parent, false); viewHolder = new SubItemViewHolder(view); } return viewHolder; } @Override public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int position) { ItemStatus itemStatus = getItemStatusByPosition(position); TreeListDao<K, V> data = mTreeList.get(itemStatus.getGroupItemIndex()); int groupIndex = itemStatus.getGroupItemIndex(); int subIndex = itemStatus.getSubItemIndex(); if (itemStatus.getViewType() == ItemStatus.VIEW_TYPE_GROUP_ITEM) { GroupItemViewHolder holder = (GroupItemViewHolder) viewHolder; onBindGroupHolder(holder, data.getGroupDao(), groupIndex, position); } else if (itemStatus.getViewType() == ItemStatus.VIEW_TYPE_SUB_ITEM) { try { SubItemViewHolder holder = (SubItemViewHolder) viewHolder; onBindSubHolder(holder, data.getSubList().get(subIndex), subIndex, groupIndex, position); } catch (Exception e) { // Log.e("TAG", "position === " + position + ";subIndex === " + subIndex); } } } @Override public int getItemCount() { int itemCount = 0; if (mGroupItemStatus == null || 0 == mGroupItemStatus.size()) { return itemCount; } for (int i = 0; i < mTreeList.size(); i++) { itemCount++; int subSize = mTreeList.get(i).getSubList().size(); if (mGroupItemStatus.get(i)) { itemCount += subSize; } else { int minCount = mTreeList.get(i).getMinCount(); itemCount += subSize > minCount ? minCount : subSize; } } return itemCount; } @Override public int getItemViewType(int position) { return getItemStatusByPosition(position).getViewType(); } public void setData(List<TreeListDao<K, V>> list) { this.mTreeList.clear(); this.mTreeList.addAll(list); initGroupItemStatus(); notifyDataSetChanged(); } public void toggleMoreHide(int groupIndex) { if (mTreeList.get(groupIndex).isEnableExpand()) { mGroupItemStatus.set(groupIndex, !mGroupItemStatus.get(groupIndex)); notifyDataSetChanged(); } } private void initGroupItemStatus() { if (mGroupItemStatus == null) { mGroupItemStatus = new ArrayList<>(); } mGroupItemStatus.clear(); for (TreeListDao<K, V> item : mTreeList) { mGroupItemStatus.add(!item.isEnableExpand() || (item.isEnableExpand() && item.isExpand())); } } private ItemStatus getItemStatusByPosition(int position) { ItemStatus itemStatus = new ItemStatus(); int itemCount = 0; int i = 0; while (i < mGroupItemStatus.size()) { if (itemCount == position) { itemStatus.setViewType(ItemStatus.VIEW_TYPE_GROUP_ITEM); itemStatus.setGroupItemIndex(i); break; } else if (itemCount > position) { itemStatus.setViewType(ItemStatus.VIEW_TYPE_SUB_ITEM); itemStatus.setGroupItemIndex(i - 1); TreeListDao<K, V> dao = mTreeList.get(i - 1); int subSize = dao.getSubList().size(); int temp = itemCount - subSize; // Log.i("TAG", "\ntemp === " + temp + ";itemcount === " + itemCount + ";subsize === " + subSize + ";pos === " + position); if (!mGroupItemStatus.get(i - 1)) { int ind; if (subSize > dao.getMinCount()) { ind = position - temp - subSize + dao.getMinCount(); } else { ind = position - temp; } itemStatus.setSubItemIndex(ind); } else { itemStatus.setSubItemIndex(position - temp); } break; } TreeListDao<K, V> dao = mTreeList.get(i); int subSize = dao.getSubList().size(); int minCount = dao.getMinCount(); int realCount = subSize > minCount ? minCount : subSize; itemCount += realCount + 1; if (mGroupItemStatus.get(i)) { if (subSize > minCount) { itemCount += (subSize - minCount); } } i++; } if (i >= mGroupItemStatus.size()) { itemStatus.setViewType(ItemStatus.VIEW_TYPE_SUB_ITEM); itemStatus.setGroupItemIndex(i - 1); int subSize = mTreeList.get(i - 1).getSubList().size(); int minCount = mTreeList.get(i - 1).getMinCount(); int temp = itemCount - subSize; // Log.i("TAG", "\ntemp2 === " + temp + ";itemcount === " + itemCount + ";subsize === " + subSize + ";pos === " + position); if (!mGroupItemStatus.get(i - 1)) { int ind; if (subSize > minCount) { ind = position - temp - subSize + minCount; } else { ind = position - temp; } itemStatus.setSubItemIndex(ind); } else { itemStatus.setSubItemIndex(position - temp); } } return itemStatus; } public class GroupItemViewHolder extends RecyclerView.ViewHolder { GroupItemViewHolder(@NonNull View itemView) { super(itemView); } } public class SubItemViewHolder extends RecyclerView.ViewHolder { SubItemViewHolder(@NonNull View itemView) { super(itemView); } } }