Android ExpandableListView双层嵌套实现 * 树形菜单

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 * 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 * 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 * 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

来源：https://blog.csdn.net/shexiaoheng/article/details/41351247