Android ExpandableListView双层嵌套实现三级树形菜单

发布时间：2020-09-20 23:32:45 来源：脚本之家阅读：229 作者：shexiaoheng 栏目：移动开发

在Android开发中，列表可以说是最常见的了，一般都是使用ListView，当涉及到二维数组时，更多的使用到ExpandableListView，然而当数据结构比较复杂时，就需要使用三级菜单或者更多级的菜单来显示，这就让人比较头疼了，最近做的项目就涉及到了三级菜单，遇到了不少问题，虽然不够完美，但是基本需求实现了，在此记录一下。（之前见过有人使用ListView实现4级、5级甚至更多级菜单的，是在Adapter的数据源里定义的结构，根据等级缩进左间距的倍数，链接地址找不到了，有兴趣的可以自己找找）

先上效果图：

简单介绍下重点，为了简便，把第一层ExpandableListView称之为EListOne，相应的Adapter称之为AdpOne；第二层ExpandableListView称之为EListTwo，相应的Adapter称之为AdpTwo。

首先第一个要处理的问题是在AdpOne的getChildView方法中，需要对EListTwo的高度进行动态计算，因为EListTwo展开和关闭时高度是不一样的，所以要在EListTwo的setOnGroupExpandListener和setOnGroupCollapseListener方法中做相应的处理：

/**
 * @author Apathy、恒
 * 
 *   子ExpandableListView展开时，因为group只有一项，所以子ExpandableListView的总高度=
 *   （子ExpandableListView的child数量 + 1 ）* 每一项的高度
 * */
 eListView.setOnGroupExpandListener(new OnGroupExpandListener() {
   @Override
   public void onGroupExpand(int groupPosition) {
 
 LayoutParams lp = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 
      (child.getChildNames().size() + 1)* (int) mContext.getResources().getDimension(R.dimen.parent_expandable_list_height));
 eListView.setLayoutParams(lp);
 }
 });
 
 /**
 * @author Apathy、恒
 * 
 * 子ExpandableListView关闭时，此时只剩下group这一项，所以子ExpandableListView的总高度即为一项的高度
 * */
 eListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {
 @Override
 public void onGroupCollapse(int groupPosition) {
 
 LayoutParams lp = new LayoutParams(
  ViewGroup.LayoutParams.MATCH_PARENT, (int) mContext
  .getResources().getDimension(
   R.dimen.parent_expandable_list_height));
 eListView.setLayoutParams(lp);
 }
 });

只展示菜单肯定不是我们的最终需求，我们一般需要点击菜单后进行相应的界面跳转或者数据处理，所以就需要获取所点击的菜单精确下标，获取方法很简单，只需要定义一个接口，在AdpOne的getChildView方法中回调即可：

/**
 * @author Apathy、恒
 * 
 *   点击子ExpandableListView子项时，调用回调接口
 * */
 eListView.setOnChildClickListener(new OnChildClickListener() {
 
 @Override
 public boolean onChildClick(ExpandableListView arg0, View arg1,
  int groupIndex, int childIndex, long arg4) {
 
 if (mTreeViewClickListener != null) {
 
  mTreeViewClickListener.onClickPosition(groupPosition,
  childPosition, childIndex);
 }
 return false;
 }
 });

下面是完整的代码：

MainActivity.java：

package com.heng.tree;
 
import java.util.ArrayList;
 
import com.heng.tree.R;
import com.heng.tree.adapter.ParentAdapter;
import com.heng.tree.adapter.ParentAdapter.OnChildTreeViewClickListener;
import com.heng.tree.entity.ChildEntity;
import com.heng.tree.entity.ParentEntity;
 
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.Toast;
 
/**
 * 
 * @author Apathy、恒
 * 
 * <br/>
 * 
 * @email shexiaoheng@163.com
 * 
 * @blog
 * <a href='http://blog.csdn.net/shexiaoheng'>http://blog.csdn.net/shexiaoheng</a >
 * 
 * <br/>
 * <br/>
 * 
 * @Detail 本Demo为ExpandableListView嵌套ExpandableListView实现三级菜单的例子
 * 
 * #ParentAdapter.OnChildTreeViewClickListener
 * 
 * */
public class MainActivity extends Activity implements OnGroupExpandListener,
 OnChildTreeViewClickListener {
 
 private Context mContext;
 
 private ExpandableListView eList;
 
 private ArrayList<ParentEntity> parents;
 
 private ParentAdapter adapter;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 
 mContext = this;
 
 setContentView(R.layout.activity_main);
 
 loadData();
 
 initEList();
 
 }
 
 /**
 * @author Apathy、恒
 * 
 *   初始化菜单数据源
 * */
 private void loadData() {
 
 parents = new ArrayList<ParentEntity>();
 
 for (int i = 0; i < 10; i++) {
 
 ParentEntity parent = new ParentEntity();
 
 parent.setGroupName("父类父分组第" + i + "项");
 
 parent.setGroupColor(getResources().getColor(
  android.R.color.holo_red_light));
 
 ArrayList<ChildEntity> childs = new ArrayList<ChildEntity>();
 
 for (int j = 0; j < 8; j++) {
 
 ChildEntity child = new ChildEntity();
 
 child.setGroupName("子类父分组第" + j + "项");
 
 child.setGroupColor(Color.parseColor("#ff00ff"));
 
 ArrayList<String> childNames = new ArrayList<String>();
 
 ArrayList<Integer> childColors = new ArrayList<Integer>();
 
 for (int k = 0; k < 5; k++) {
 
  childNames.add("子类第" + k + "项");
 
  childColors.add(Color.parseColor("#ff00ff"));
 
 }
 
 child.setChildNames(childNames);
 
 childs.add(child);
 
 }
 
 parent.setChilds(childs);
 
 parents.add(parent);
 
 }
 }
 
 /**
 * @author Apathy、恒
 * 
 *   初始化ExpandableListView
 * */
 private void initEList() {
 
 eList = (ExpandableListView) findViewById(R.id.eList);
 
 eList.setOnGroupExpandListener(this);
 
 adapter = new ParentAdapter(mContext, parents);
 
 eList.setAdapter(adapter);
 
 adapter.setOnChildTreeViewClickListener(this);
 
 }
 
 /**
 * @author Apathy、恒
 * 
 *   点击子ExpandableListView的子项时，回调本方法，根据下标获取值来做相应的操作
 * */
 @Override
 public void onClickPosition(int parentPosition, int groupPosition,
 int childPosition) {
 // do something
 String childName = parents.get(parentPosition).getChilds()
 .get(groupPosition).getChildNames().get(childPosition)
 .toString();
 Toast.makeText(
 mContext,
 "点击的下标为： parentPosition=" + parentPosition
  + " groupPosition=" + groupPosition
  + " childPosition=" + childPosition + "\n点击的是："
  + childName, Toast.LENGTH_SHORT).show();
 }
 
 /**
 * @author Apathy、恒
 * 
 *   展开一项，关闭其他项，保证每次只能展开一项
 * */
 @Override
 public void onGroupExpand(int groupPosition) {
 for (int i = 0; i < parents.size(); i++) {
 if (i != groupPosition) {
 eList.collapseGroup(i);
 }
 }
 }
 
}

ParentAdapter.java

package com.heng.tree.adapter;
 
import java.util.ArrayList;
 
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupCollapseListener;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.AbsListView.LayoutParams;
import android.widget.TextView;
 
import com.heng.tree.R;
import com.heng.tree.entity.ChildEntity;
import com.heng.tree.entity.ParentEntity;
 
/**
 * 
 * @author Apathy、恒
 * 
 *   父类分组的适配器
 * 
 * <br/>
 * <br/>
 * 
 *   方法 {@link #getChildView(int, int, boolean, View, ViewGroup)}<b><font
 *   color='#ff00ff' size='2'>极其重要</font></b>
 * 
 * */
 
public class ParentAdapter extends BaseExpandableListAdapter {
 
 private Context mContext;// 上下文
 
 private ArrayList<ParentEntity> mParents;// 数据源
 
 private OnChildTreeViewClickListener mTreeViewClickListener;// 点击子ExpandableListView子项的监听
 
 public ParentAdapter(Context context, ArrayList<ParentEntity> parents) {
 this.mContext = context;
 this.mParents = parents;
 }
 
 @Override
 public ChildEntity getChild(int groupPosition, int childPosition) {
 return mParents.get(groupPosition).getChilds().get(childPosition);
 }
 
 @Override
 public long getChildId(int groupPosition, int childPosition) {
 return childPosition;
 }
 
 @Override
 public int getChildrenCount(int groupPosition) {
 return mParents.get(groupPosition).getChilds() != null ? mParents
 .get(groupPosition).getChilds().size() : 0;
 }
 
 @Override
 public View getChildView(final int groupPosition, final int childPosition,
 boolean isExpanded, View convertView, ViewGroup parent) {
 
 final ExpandableListView eListView = getExpandableListView();
 
 ArrayList<ChildEntity> childs = new ArrayList<ChildEntity>();
 
 final ChildEntity child = getChild(groupPosition, childPosition);
 
 childs.add(child);
 
 final ChildAdapter childAdapter = new ChildAdapter(this.mContext,
 childs);
 
 eListView.setAdapter(childAdapter);
 
 /**
 * @author Apathy、恒
 * 
 *   点击子ExpandableListView子项时，调用回调接口
 * */
 eListView.setOnChildClickListener(new OnChildClickListener() {
 
 @Override
 public boolean onChildClick(ExpandableListView arg0, View arg1,
  int groupIndex, int childIndex, long arg4) {
 
 if (mTreeViewClickListener != null) {
 
  mTreeViewClickListener.onClickPosition(groupPosition,
  childPosition, childIndex);
 }
 return false;
 }
 });
 
 
 /**
 * @author Apathy、恒
 * 
 *   子ExpandableListView展开时，因为group只有一项，所以子ExpandableListView的总高度=
 *   （子ExpandableListView的child数量 + 1 ）* 每一项的高度
 * */
 eListView.setOnGroupExpandListener(new OnGroupExpandListener() {
 @Override
 public void onGroupExpand(int groupPosition) {
 
 LayoutParams lp = new LayoutParams(
  ViewGroup.LayoutParams.MATCH_PARENT, (child
  .getChildNames().size() + 1)
  * (int) mContext.getResources().getDimension(
   R.dimen.parent_expandable_list_height));
 eListView.setLayoutParams(lp);
 }
 });
 
 /**
 * @author Apathy、恒
 * 
 *   子ExpandableListView关闭时，此时只剩下group这一项，
 *   所以子ExpandableListView的总高度即为一项的高度
 * */
 eListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {
 @Override
 public void onGroupCollapse(int groupPosition) {
 
 LayoutParams lp = new LayoutParams(
  ViewGroup.LayoutParams.MATCH_PARENT, (int) mContext
  .getResources().getDimension(
   R.dimen.parent_expandable_list_height));
 eListView.setLayoutParams(lp);
 }
 });
 return eListView;
 
 }
 
 /**
 * @author Apathy、恒
 * 
 *   动态创建子ExpandableListView
 * */
 public ExpandableListView getExpandableListView() {
 ExpandableListView mExpandableListView = new ExpandableListView(
 mContext);
 LayoutParams lp = new LayoutParams(
 ViewGroup.LayoutParams.MATCH_PARENT, (int) mContext
  .getResources().getDimension(
  R.dimen.parent_expandable_list_height));
 mExpandableListView.setLayoutParams(lp);
 mExpandableListView.setDividerHeight(0);// 取消group项的分割线
 mExpandableListView.setChildDivider(null);// 取消child项的分割线
 mExpandableListView.setGroupIndicator(null);// 取消展开折叠的指示图标
 return mExpandableListView;
 }
 
 @Override
 public Object getGroup(int groupPosition) {
 return mParents.get(groupPosition);
 }
 
 @Override
 public int getGroupCount() {
 return mParents != null ? mParents.size() : 0;
 }
 
 @Override
 public long getGroupId(int groupPosition) {
 return groupPosition;
 }
 
 @Override
 public View getGroupView(int groupPosition, boolean isExpanded,
 View convertView, ViewGroup parent) {
 GroupHolder holder = null;
 if (convertView == null) {
 convertView = LayoutInflater.from(mContext).inflate(
  R.layout.parent_group_item, null);
 holder = new GroupHolder(convertView);
 convertView.setTag(holder);
 } else {
 holder = (GroupHolder) convertView.getTag();
 }
 holder.update(mParents.get(groupPosition));
 return convertView;
 }
 
 /**
 * @author Apathy、恒
 * 
 *   Holder优化
 * */
 class GroupHolder {
 
 private TextView parentGroupTV;
 
 public GroupHolder(View v) {
 parentGroupTV = (TextView) v.findViewById(R.id.parentGroupTV);
 }
 
 public void update(ParentEntity model) {
 parentGroupTV.setText(model.getGroupName());
 parentGroupTV.setTextColor(model.getGroupColor());
 }
 }
 
 @Override
 public boolean hasStableIds() {
 return false;
 }
 
 @Override
 public boolean isChildSelectable(int groupPosition, int childPosition) {
 return false;
 }
 
 /**
 * @author Apathy、恒
 * 
 *   设置点击子ExpandableListView子项的监听
 * */
 public void setOnChildTreeViewClickListener(
 OnChildTreeViewClickListener treeViewClickListener) {
 this.mTreeViewClickListener = treeViewClickListener;
 }
 
 /**
 * @author Apathy、恒
 * 
 *   点击子ExpandableListView子项的回调接口
 * */
 public interface OnChildTreeViewClickListener {
 
 void onClickPosition(int parentPosition, int groupPosition,
 int childPosition);
 }
 
}

ChildAdapter.java

package com.heng.tree.adapter;
 
import java.util.ArrayList;
 
import com.heng.tree.R;
import com.heng.tree.entity.ChildEntity;
 
import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;
 
/**
 * 
 * @author Apathy、恒
 * 
 * <br/>
 * <br/>
 * 
 *   子类分组的适配器
 * 
 * <br/>
 * <br/>
 * 
 *   方法{@link #isChildSelectable(int,int)} <b><font color='#ff00ff'
 *   size='2'>必须返回true</font></b>
 * 
 * */
public class ChildAdapter extends BaseExpandableListAdapter {
 
 private Context mContext;// 上下文
 
 private ArrayList<ChildEntity> mChilds;// 数据源
 
 public ChildAdapter(Context context, ArrayList<ChildEntity> childs) {
 this.mContext = context;
 this.mChilds = childs;
 }
 
 @Override
 public int getChildrenCount(int groupPosition) {
 return mChilds.get(groupPosition).getChildNames() != null ? mChilds
 .get(groupPosition).getChildNames().size() : 0;
 }
 
 @Override
 public String getChild(int groupPosition, int childPosition) {
 if (mChilds.get(groupPosition).getChildNames() != null
 && mChilds.get(groupPosition).getChildNames().size() > 0)
 return mChilds.get(groupPosition).getChildNames()
  .get(childPosition).toString();
 return null;
 }
 
 @Override
 public long getChildId(int groupPosition, int childPosition) {
 return childPosition;
 }
 
 @Override
 public View getChildView(int groupPosition, int childPosition,
 boolean isExpanded, View convertView, ViewGroup parent) {
 ChildHolder holder = null;
 if (convertView == null) {
 convertView = LayoutInflater.from(mContext).inflate(
  R.layout.child_child_item, null);
 holder = new ChildHolder(convertView);
 convertView.setTag(holder);
 } else {
 holder = (ChildHolder) convertView.getTag();
 }
 holder.update(getChild(groupPosition, childPosition));
 return convertView;
 }
 
 /**
 * @author Apathy、恒
 * 
 *   Holder优化
 * */
 class ChildHolder {
 
 private TextView childChildTV;
 
 public ChildHolder(View v) {
 childChildTV = (TextView) v.findViewById(R.id.childChildTV);
 }
 
 public void update(String str) {
 childChildTV.setText(str);
 childChildTV.setTextColor(Color.parseColor("#00ffff"));
 }
 }
 
 @Override
 public Object getGroup(int groupPosition) {
 if (mChilds != null && mChilds.size() > 0)
 return mChilds.get(groupPosition);
 return null;
 }
 
 @Override
 public int getGroupCount() {
 return mChilds != null ? mChilds.size() : 0;
 }
 
 @Override
 public long getGroupId(int groupPosition) {
 return groupPosition;
 }
 
 @Override
 public View getGroupView(int groupPosition, boolean isExpanded,
 View convertView, ViewGroup parent) {
 GroupHolder holder = null;
 if (convertView == null) {
 convertView = LayoutInflater.from(mContext).inflate(
  R.layout.child_group_item, null);
 holder = new GroupHolder(convertView);
 convertView.setTag(holder);
 } else {
 holder = (GroupHolder) convertView.getTag();
 }
 holder.update(mChilds.get(groupPosition));
 return convertView;
 }
 
 /**
 * @author Apathy、恒
 * 
 *   Holder优化
 * */
 class GroupHolder {
 
 private TextView childGroupTV;
 
 public GroupHolder(View v) {
 childGroupTV = (TextView) v.findViewById(R.id.childGroupTV);
 }
 
 public void update(ChildEntity model) {
 childGroupTV.setText(model.getGroupName());
 childGroupTV.setTextColor(model.getGroupColor());
 }
 }
 
 @Override
 public boolean hasStableIds() {
 return false;
 }
 
 @Override
 public boolean isChildSelectable(int groupPosition, int childPosition) {
 /**
 * ==============================================
 * 此处必须返回true，否则无法响应子项的点击事件===============
 * ==============================================
 **/
 return true;
 }
 
}

CListAdapter.java

package com.heng.tree.adapter;
 
import java.util.ArrayList;
 
import com.heng.tree.R;
import com.heng.tree.entity.ChildEntity;
 
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
 
/**
 * 
 * @author Apathy、恒
 * 
 *   子类子类列表的适配器
 * 
 * */
public class CListAdapter extends BaseAdapter {
 
 private Context mContext;
 private ArrayList<ChildEntity> mChilds;
 
 public CListAdapter(Context context, ArrayList<ChildEntity> childs) {
 this.mContext = context;
 this.mChilds = childs;
 }
 
 @Override
 public int getCount() {
 return mChilds != null ? mChilds.size() : 0;
 }
 
 @Override
 public Object getItem(int position) {
 if ((getCount() > 0) && (position > 0 && position < mChilds.size())) {
 return mChilds.get(position);
 }
 return null;
 }
 
 @Override
 public long getItemId(int position) {
 return position;
 }
 
 @Override
 public View getView(int position, View convertView, ViewGroup parent) {
 Holder holder = null;
 if (convertView == null) {
 convertView = LayoutInflater.from(mContext).inflate(
  R.layout.child_child_item, null);
 holder = new Holder(convertView);
 convertView.setTag(holder);
 } else {
 holder = (Holder) convertView.getTag();
 }
 holder.update(mChilds.get(position).getGroupName());
 return convertView;
 }
 
 class Holder {
 
 private TextView tv;
 
 public Holder(View v) {
 tv = (TextView) v.findViewById(R.id.childChildTV);
 }
 
 public void update(String text) {
 tv.setText(text);
 }
 }
}

ParentEntity.java

package com.heng.tree.entity;
 
import java.util.ArrayList;
 
/**
 * 
 * @author Apathy、恒
 * 
 *   子类分组的实体
 * 
 * */
 
public class ParentEntity {
 
 private int groupColor;
 
 private String groupName;
 
 private ArrayList<ChildEntity> childs;
 
 
 /* ==========================================================
 * ======================= get method =======================
 * ========================================================== */
 
 public int getGroupColor() {
 return groupColor;
 }
 
 public String getGroupName() {
 return groupName;
 }
 
 public ArrayList<ChildEntity> getChilds() {
 return childs;
 }
 
 /* ==========================================================
 * ======================= set method =======================
 * ========================================================== */
 
 public void setGroupColor(int groupColor) {
 this.groupColor = groupColor;
 }
 
 public void setGroupName(String groupName) {
 this.groupName = groupName;
 }
 
 public void setChilds(ArrayList<ChildEntity> childs) {
 this.childs = childs;
 }
 
}

ChildEntity.java

package com.heng.tree.entity;
 
import java.util.ArrayList;
 
/**
 * 
 * @author Apathy、恒
 * 
 *   父类分组的实体
 * 
 * */
 
public class ChildEntity {
 
 private int groupColor;
 
 private String groupName;
 
 private ArrayList<String> childNames;
 
 
 /* ==========================================================
 * ======================= get method =======================
 * ========================================================== */
 
 public int getGroupColor() {
 return groupColor;
 }
 
 public String getGroupName() {
 return groupName;
 }
 
 public ArrayList<String> getChildNames() {
 return childNames;
 }
 
 /* ==========================================================
 * ======================= set method =======================
 * ========================================================== */
 
 public void setGroupColor(int groupColor) {
 this.groupColor = groupColor;
 }
 
 public void setGroupName(String groupName) {
 this.groupName = groupName;
 }
 
 public void setChildNames(ArrayList<String> childNames) {
 this.childNames = childNames;
 }
 
}

activity_main.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent" >
 
 <ExpandableListView
  android:id="@+id/eList"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:groupIndicator="@null" />
 
</FrameLayout>

parent_group_item.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:paddingLeft="@dimen/parent_expandable_list_group_padding_left" >
 
 <TextView
  android:id="@+id/parentGroupTV"
  android:layout_width="wrap_content"
  android:layout_height="@dimen/parent_expandable_list_height"
  android:gravity="center_vertical" />
 
</RelativeLayout>

child_group_item.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="wrap_content" >
 
 <RelativeLayout
  android:layout_width="match_parent"
  android:layout_height="@dimen/parent_expandable_list_height" >
 
  <TextView
   android:id="@+id/childGroupTV"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:layout_centerVertical="true"
   android:paddingLeft="@dimen/child_expandable_list_group_padding_left" />
 </RelativeLayout>
 
</LinearLayout>

child_child_item.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="wrap_content" >
 
 <RelativeLayout
  android:layout_width="match_parent"
  android:layout_height="@dimen/parent_expandable_list_height" >
 
  <TextView
   android:id="@+id/childChildTV"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:layout_centerVertical="true"
   android:paddingLeft="@dimen/child_expandable_list_child_padding_left" />
 </RelativeLayout>
 
</LinearLayout>

dimens.xml

<resources>
 
 <!-- Default screen margins, per the Android Design guidelines. -->
 <dimen name="parent_expandable_list_height">50dp</dimen>
 <dimen name="parent_expandable_list_group_padding_left">10dp</dimen>
 <dimen name="child_expandable_list_group_padding_left">40dp</dimen>
 <dimen name="child_expandable_list_child_padding_left">75dp</dimen>
 
</resources>

点此下载demo

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持亿速云。

向AI问一下细节

Android ExpandableListView双层嵌套实现三级树形菜单

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