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

*

*

*

* @email shexiaoheng@163.com

*

* @blog

* http://blog.csdn.net/shexiaoheng

*

*

*

*

* @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 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();

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 childs = new ArrayList();

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 childNames = new ArrayList();

ArrayList childColors = new ArrayList();

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

*

*

*

*

* 方法 {@link #getChildView(int, int, boolean, View, ViewGroup)}

* color='#ff00ff' size='2'>极其重要

*

* */

public class ParentAdapter extends BaseExpandableListAdapter {

private Context mContext;// 上下文

private ArrayList mParents;// 数据源

private OnChildTreeViewClickListener mTreeViewClickListener;// 点击子ExpandableListView子项的监听

public ParentAdapter(Context context, ArrayList 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 childs = new ArrayList();

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

*

*

*

*

* 子类分组的适配器

*

*

*

*

* 方法{@link #isChildSelectable(int,int)}

* size='2'>必须返回true

*

* */

public class ChildAdapter extends BaseExpandableListAdapter {

private Context mContext;// 上下文

private ArrayList mChilds;// 数据源

public ChildAdapter(Context context, ArrayList 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 mChilds;

public CListAdapter(Context context, ArrayList 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 childs;

/* ==========================================================

* ======================= get method =======================

* ========================================================== */

public int getGroupColor() {

return groupColor;

}

public String getGroupName() {

return groupName;

}

public ArrayList 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 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 childNames;

/* ==========================================================

* ======================= get method =======================

* ========================================================== */

public int getGroupColor() {

return groupColor;

}

public String getGroupName() {

return groupName;

}

public ArrayList 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 childNames) {

this.childNames = childNames;

}

}

activity_main.xml

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent" >

android:id="@+id/eList"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:groupIndicator="@null" />

parent_group_item.xml

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:paddingLeft="@dimen/parent_expandable_list_group_padding_left" >

android:id="@+id/parentGroupTV"

android:layout_width="wrap_content"

android:layout_height="@dimen/parent_expandable_list_height"

android:gravity="center_vertical" />

child_group_item.xml

android:layout_width="match_parent"

android:layout_height="wrap_content" >

android:layout_width="match_parent"

android:layout_height="@dimen/parent_expandable_list_height" >

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" />

child_child_item.xml

android:layout_width="match_parent"

android:layout_height="wrap_content" >

android:layout_width="match_parent"

android:layout_height="@dimen/parent_expandable_list_height" >

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" />

dimens.xml

50dp

10dp

40dp

75dp

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脚本之家。

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