Android自带的控件ExpandableListView实现了分组列表功能，本案例在此基础上进行优化，为此控件添加增删改分组及子项的功能，以及列表数据的持久化。

Demo实现效果：

GroupListDemo具体实现：

①demo中将列表页面设计为Fragment页面，方便后期调用；在主界面MainActivity中动态添加GroupListFragment页面；

MainActivity.java

package com.eric.grouplistdemo;

import android.app.Activity;

import android.app.Fragment;

import android.app.FragmentManager;

import android.os.Bundle;

import android.widget.RelativeLayout;

public class MainActivity extends Activity {

public static GroupListFragment fragment;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

fragment = new GroupListFragment();

getFragmentManager().beginTransaction()

.replace(R.id.fragContainer, fragment).commit();

}

}

动态添加GroupListFragment实例到界面的fragContainer布局中；将fragment声明为static用于在Adapter中组添加子项时进行调用。

activity_main.xml

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

android:id="@+id/fragContainer"

android:layout_width="match_parent"

android:layout_height="match_parent"

>

②实现自定义适配器类MyAdapter，继承自BaseExpandableListAdapter；组项布局及子项布局；

list_item_parent.xml组项布局文件，展开图标及名称，增删图标；

android:layout_width="match_parent"

android:layout_height="50dp"

android:background="#0099ff"

android:orientation="horizontal">

android:id="@+id/image_parent"

android:layout_width="50dp"

android:layout_height="50dp"

android:src="@drawable/image_parent1"/>

android:id="@+id/text_parent"

android:layout_width="wrap_content"

android:layout_height="50dp"

android:textColor="#FFF"

android:textSize="20sp"

android:text="parent1"

android:layout_toRightOf="@id/image_parent"

android:gravity="center"/>

android:id="@+id/image_delete"

android:layout_width="40dp"

android:layout_height="40dp"

android:layout_centerVertical="true"

android:layout_alignParentRight="true"

android:src="@drawable/delete"/>

android:id="@+id/image_add"

android:layout_width="40dp"

android:layout_height="40dp"

android:layout_centerVertical="true"

android:layout_toLeftOf="@id/image_delete"

android:src="@drawable/add"/>

list_item_child.xml子项布局文件，名称及删除图标；

android:layout_width="match_parent"

android:layout_height="40dp"

>

android:id="@+id/text_child"

android:layout_width="wrap_content"

android:layout_height="40dp"

android:layout_margin="5dp"

android:textColor="#0099ff"

android:text="child"

android:layout_centerInParent="true"

android:gravity="center"/>

android:id="@+id/image_delete"

android:layout_width="40dp"

android:layout_height="40dp"

android:layout_alignParentRight="true"

android:layout_centerVertical="true"

android:src="@drawable/delete"/>

MyAdapter.java自定义适配器

package com.eric.grouplistdemo;

import java.util.List;

import java.util.Map;

import android.content.Context;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.BaseExpandableListAdapter;

import android.widget.EditText;

import android.widget.ImageView;

import android.widget.TextView;

public class MyAdapter extends BaseExpandableListAdapter{

private List parentList;

private Map> map;

private Context context;

private EditText edit_modify;

private ModifyDialog dialog;

//构造函数

public MyAdapter(Context context, List parentList, Map> map) {

this.context = context;

this.parentList = parentList;

this.map = map;

}

//获取分组数

@Override

public int getGroupCount() {

return parentList.size();

}

//获取当前组的子项数

@Override

public int getChildrenCount(int groupPosition) {

String groupName = parentList.get(groupPosition);

int childCount = map.get(groupName).size();

return childCount;

}

//获取当前组对象

@Override

public Object getGroup(int groupPosition) {

String groupName = parentList.get(groupPosition);

return groupName;

}

//获取当前子项对象

@Override

public Object getChild(int groupPosition, int childPosition) {

String groupName = parentList.get(groupPosition);

String chidlName = map.get(groupName).get(childPosition);

return chidlName;

}

//获取组ID

@Override

public long getGroupId(int groupPosition) {

return groupPosition;

}

//获取子项ID

@Override

public long getChildId(int groupPosition, int childPosition) {

return childPosition;

}

@Override

public boolean hasStableIds() {

return true;

}

//组视图初始化

@Override

public View getGroupView(int groupPosition, boolean isExpanded,

View convertView, ViewGroup parent) {

final int groupPos = groupPosition;

if(convertView == null){

convertView = LayoutInflater.from(context).inflate(R.layout.list_item_parent, null);

}

ImageView image = (ImageView) convertView.findViewById(R.id.image_parent);

ImageView image_add = (ImageView) convertView.findViewById(R.id.image_add);

ImageView image_delete = (ImageView) convertView.findViewById(R.id.image_delete);

if(isExpanded){

image.setImageResource(R.drawable.image_parent2);

}else{

image.setImageResource(R.drawable.image_parent1);

}

image_add.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

alertAddDialog(MainActivity.fragment.getActivity(), "新增子项", groupPos);

}

});

image_delete.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

GroupListFragment.deleteGroup(groupPos);

}

});

TextView parentText = (TextView) convertView.findViewById(R.id.text_parent);

parentText.setText(parentList.get(groupPosition));

return convertView;

}

//子项视图初始化

@Override

public View getChildView(int groupPosition, int childPosition,

boolean isLastChild, View convertView, ViewGroup parent) {

final int groupPos = groupPosition;

final int childPos = childPosition;

if(convertView == null){

convertView = LayoutInflater.from(context).inflate(R.layout.list_item_child, null);

}

TextView childText = (TextView) convertView.findViewById(R.id.text_child);

ImageView image_delete = (ImageView) convertView.findViewById(R.id.image_delete);

String parentName = parentList.get(groupPosition);

String childName = map.get(parentName).get(childPosition);

childText.setText(childName);

image_delete.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

GroupListFragment.deleteChild(groupPos, childPos);

}

});

return convertView;

}

@Override

public boolean isChildSelectable(int groupPosition, int childPosition) {

return true;

}

//弹新增子项对话框

public void alertAddDialog(Context context, String title, int currentGroup){

final int group = currentGroup;

dialog = new ModifyDialog(context, title, null);

edit_modify = dialog.getEditText();

dialog.setOnClickCommitListener(new OnClickListener() {

@Override

public void onClick(View v) {

GroupListFragment.addChild(group, edit_modify.getText().toString());

dialog.dismiss();

}

});

dialog.show();

}

}

构造函数：将传入的parentList和map进行数据同步，parentList保存组数据，map保存对应组及其子项list数据；

获取分组数及子项数等很简单，就不介绍了，主要讲述一下，组视图初始化和子项视图初始化这两个函数；

组视图初始化getGroupView()：尽量复用convertView防止内存泄露，首先是进行判断，若convertView为空，则进行组视图初始化，加载list_item_parent子项布局；获取到相应的组布局控件：展开图标image、添加图标image_add、删除图标image_delete；通过传递过来的布尔类型参数isExpanded，进行判断给image赋值展开图标或合并图标；分别给添加图标和删除图标添加点击事件，分别调用GroupListFragment中的弹出添加窗口函数alertAddDialog()和删除组函数deleteGroup()；

子项视图初始化getChildView()：同样尽量复用convertView防止内存泄露，首先是进行判断，若convertView为空，则进行子项视图初始化，加载list_item_child子项布局；获取到相应的子布局控件：内容文本ChildText和删除图标Image_delete；从parentList和map中分别获取到，当前子项的组名parentName和子项名childName，赋值ChildText，删除图标添加点击事件，调用删除子项函数deleteChild()；

③实现自定义对话框类ModifyDialog，继承自Dialog类，对输入修改内容，或新增项内容进行过渡；

no_title_dialog.xml，在values目录下自定义Dialog的style类型xml，除去Dialog的标题栏；

300dp

40dp

true

dialog_modify.xml 自定义对话框的布局文件，标题文本，输入框，确定按钮；

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

android:id="@+id/text_title"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_gravity="center_horizontal"

android:gravity="center"

android:background="#0099ff"

android:text="修改名称"

android:textColor="#FFF"

android:textSize="20sp"/>

android:id="@+id/edit_modify"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="组名称"/>

android:id="@+id/btn_commit"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="确定"

android:textColor="#FFF"

android:background="#0099ff"

/>

ModifyDialog.java

package com.eric.grouplistdemo;

import android.app.Dialog;

import android.content.Context;

import android.view.LayoutInflater;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class ModifyDialog extends Dialog{

private TextView text_title;

private EditText edit_modify;

private Button btn_commit;

public ModifyDialog(Context context, String title, String name) {

super(context, R.style.noTitleDialog);

View view = LayoutInflater.from(getContext())

.inflate(R.layout.dialog_modify, null);

text_title = (TextView) view.findViewById(R.id.text_title);

edit_modify = (EditText)view.findViewById(R.id.edit_modify);

btn_commit = (Button) view.findViewById(R.id.btn_commit);

text_title.setText(title);

edit_modify.setText(name);

super.setContentView(view);

}

public EditText getEditText(){

return edit_modify;

}

public void setOnClickCommitListener(View.OnClickListener listener){

btn_commit.setOnClickListener(listener);

}

}

ModifyDialog自定义构造函数中，通过super()加载刚刚自定义的no_title_dialog.xml，声明View加载layout布局dialog_modify.xml;并且获取布局中的相应控件，将构造函数中传来的字符串title和name，分别赋值到标题文本和输入框控件中；最后调用setContentView()初始化对话框视图；

添加一个返回输入框控件的函数getEditText()，用于获取输入框输入的内容；

还需要一个自定义的点击事件监听器，绑定在确定按钮上；

④准备工作都完成了，下面就实现GroupListFragment，包括数据的初始化及持久化保存，组项和子项的增删改操作，列表子项点击事件，列表组项和子项的长按事件；

fragment_group_list.xml 页面的布局文件ExpandableListView列表以及一个添加组图标；

android:layout_width="match_parent"

android:layout_height="match_parent"

>

android:id="@+id/expandablelistview"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:groupIndicator="@null"

>

android:id="@+id/image_add"

android:layout_width="40dp"

android:layout_height="40dp"

android:layout_centerHorizontal="true"

android:layout_alignParentBottom="true"

android:src="@drawable/add"/>

这里需要将ExpandableListView的groupIndicator属性设置为@null，不使用其自带的展开图标；

GroupListFragment.java 加载列表的页面

package com.eric.grouplistdemo;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;

import android.R.integer;

import android.app.Fragment;

import android.content.Context;

import android.content.SharedPreferences;

import android.content.SharedPreferences.Editor;

import android.os.Bundle;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.EditText;

import android.widget.ExpandableListView;

import android.widget.ImageView;

import android.widget.Toast;

public class GroupListFragment extends Fragment{

private View view;

private ExpandableListView expandableListView;

public static MyAdapter adapter;

public static List parentList;

public static Map> map;

private ModifyDialog dialog;

private EditText edit_modify;

private ImageView image_add;

private int currentGroup,currentChild;

public static SharedPreferences sp;

public static Editor editor;

public static String dataMap,dataParentList;

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

view = inflater.inflate(R.layout.fragment_group_list, container, false);

expandableListView = (ExpandableListView) view.findViewById(R.id.expandablelistview);

image_add = (ImageView) view.findViewById(R.id.image_add);

image_add.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

alertAddDialog(getActivity(), "新增组");

}

});

initData();

adapter = new MyAdapter(getActivity().getApplicationContext(), parentList, map);

expandableListView.setAdapter(adapter);

//设置子项点击事件

MyOnClickListener myListener = new MyOnClickListener();

expandableListView.setOnChildClickListener(myListener);

//设置长按点击事件

MyOnLongClickListener myLongListener = new MyOnLongClickListener();

expandableListView.setOnItemLongClickListener(myLongListener);

return view;

}

public void initData(){

map = new HashMap>();

parentList = new ArrayList();

sp = getActivity().getApplicationContext().getSharedPreferences("spfile", getActivity().MODE_PRIVATE);

dataMap = sp.getString("dataMap", null);

dataParentList = sp.getString("dataParentList", null);

if(dataMap == null || dataParentList == null){

parentList = new ArrayList();

parentList.add("客厅");

parentList.add("厨房");

parentList.add("卧室");

List list1 = new ArrayList();

list1.add("客厅空调");

list1.add("客厅电视");

list1.add("客厅电灯");

map.put("客厅", list1);

List list2 = new ArrayList();

list2.add("厨房油烟机");

list2.add("厨房电灯");

list2.add("厨房电器");

map.put("厨房", list2);

List list3 = new ArrayList();

list3.add("卧室空调");

list3.add("卧室灯光");

list3.add("卧室电视");

map.put("卧室", list3);

}else{

try {

//初始化parentList

JSONArray jsonArray = new JSONArray(dataParentList);

for (int i = 0; i < jsonArray.length(); i++) {

parentList.add(jsonArray.get(i).toString());

}

//初始化map

JSONObject jsonObject = new JSONObject(dataMap);

for (int i = 0; i < jsonObject.length(); i++) {

String key = jsonObject.getString(parentList.get(i));

JSONArray array = new JSONArray(key);

List list = new ArrayList();

for (int j = 0; j < array.length(); j++) {

list.add(array.get(j).toString());

}

map.put(parentList.get(i), list);

}

Log.d("eric", "①："+map+"②："+parentList);

} catch (JSONException e) {

e.printStackTrace();

Log.e("eric","String转Map或List出错"+e);

}

}

Log.e("eric", dataMap+"!&&!"+dataParentList);

saveData();

}

//自定义点击监听事件

public class MyOnClickListener implements ExpandableListView.OnChildClickListener{

@Override

public boolean onChildClick(ExpandableListView parent, View v,

int groupPosition, int childPosition, long id) {

String str = "choose"+groupPosition+"-"+childPosition;

Toast.makeText(getActivity(), str, Toast.LENGTH_SHORT).show();

return false;

}

}

//自定义长按监听事件

public class MyOnLongClickListener implements AdapterView.OnItemLongClickListener{

@Override

public boolean onItemLongClick(AdapterView> parent, View view,

int position, long id) {

//长按子项

if (ExpandableListView.getPackedPositionType(id) == ExpandableListView.PACKED_POSITION_TYPE_CHILD){

long packedPos = ((ExpandableListView) parent).getExpandableListPosition(position);

int groupPosition = ExpandableListView.getPackedPositionGroup(packedPos);

int childPosition = ExpandableListView.getPackedPositionChild(packedPos);

currentGroup = groupPosition;

currentChild = childPosition;

String str = (String)adapter.getChild(groupPosition, childPosition);

alertModifyDialog("修改此项名称",str);

Toast.makeText(getActivity(),str,Toast.LENGTH_SHORT).show();

return true;

//长按组

}else if(ExpandableListView.getPackedPositionType(id) == ExpandableListView.PACKED_POSITION_TYPE_GROUP){

long packedPos = ((ExpandableListView) parent).getExpandableListPosition(position);

int groupPosition = ExpandableListView.getPackedPositionGroup(packedPos);

int childPosition = ExpandableListView.getPackedPositionChild(packedPos);

currentGroup = groupPosition;

currentChild = childPosition;

String group = parentList.get(groupPosition);

alertModifyDialog("修改组名称", group);

String str = (String)adapter.getGroup(groupPosition);

Toast.makeText(getActivity(),str,Toast.LENGTH_SHORT).show();

}

return false;

}

}

//新增组

public static void addGroup(String newGroupName){

parentList.add(newGroupName);

List list = new ArrayList();

map.put(newGroupName, list);

adapter.notifyDataSetChanged();

saveData();

}

//新增子项到指定组

public static void addChild(int groupPosition, String newChildName){

String groupName = parentList.get(groupPosition);

List list = map.get(groupName);

list.add(newChildName);

adapter.notifyDataSetChanged();

saveData();

}

//删除指定组

public static void deleteGroup(int groupPos){

String groupName = parentList.get(groupPos);

map.remove(groupName);

parentList.remove(groupPos);

adapter.notifyDataSetChanged();

saveData();

}

//删除指定子项

public static void deleteChild(int groupPos, int childPos){

String groupName = parentList.get(groupPos);

List list = map.get(groupName);

list.remove(childPos);

adapter.notifyDataSetChanged();

saveData();

}

//修改该项名称

public void modifyName(int groupPosition, int childPosition, String modifyName){

Toast.makeText(getActivity(), String.valueOf(groupPosition)+'-'+String.valueOf(childPosition), Toast.LENGTH_SHORT).show();

if(childPosition<0){

//修改组名称

String groupName = parentList.get(groupPosition);

if(!groupName.equals(modifyName)){

map.put(modifyName, map.get(groupName));

map.remove(groupName);

parentList.set(groupPosition, modifyName);

}

}else{

//修改子项名称

String group = parentList.get(groupPosition);

List list =map.get(group);

list.set(childPosition, modifyName);

map.put(group, list);

}

adapter.notifyDataSetChanged();

saveData();

}

//弹修改对话框

public void alertModifyDialog(String title, String name){

dialog = new ModifyDialog(getActivity(), title, name);

edit_modify = dialog.getEditText();

dialog.setOnClickCommitListener(new OnClickListener() {

@Override

public void onClick(View v) {

modifyName(currentGroup, currentChild, edit_modify.getText().toString());

dialog.dismiss();

}

});

dialog.show();

}

//弹新增组对话框

public void alertAddDialog(Context context, String title){

dialog = new ModifyDialog(context, title, null);

edit_modify = dialog.getEditText();

dialog.setOnClickCommitListener(new OnClickListener() {

@Override

public void onClick(View v) {

addGroup(edit_modify.getText().toString());

dialog.dismiss();

}

});

dialog.show();

}

//保存数据

public static void saveData(){

JSONObject jsonObject = new JSONObject(map);

dataMap = jsonObject.toString();

dataParentList = parentList.toString();

editor = sp.edit();

editor.putString("dataMap", dataMap);

editor.putString("dataParentList", dataParentList);

editor.commit();

}

}

内容有点多，一个个来：

初始化Fragment页面函数onCreateView():

首先，要进行layout布局fragment_group_list.xml加载，获取相应控件的实例，expandableListView列表控件以及添加组图标image_add，添加组图标添加点击事件；调用initData()方法进行组数据parentList和组对应子项map的初始化；然后，实例化adapter传入parentList和map数据到自定义适配器MyAdapter中，并将其绑定到expandableListView上；最后，给expandableListView添加自定义子项点击事件监听器，组项和子项长按事件监听器；

初始化数据函数initData():该函数通过ShareReference来保存数据；

首先，实例化parentList和map，从ShareReference中获取到保存的String类型的parentList和map实际数据，赋值到dataMap和dataParentList中，若当中数据不存在，默认返回null，第一次运行程序的时候肯定是没有数据的，故进行判断，若没获取到数据，那就给parentList和Map赋值“客厅”、“厨房”、“卧室”等一系列数据；如果有数据的话，那就得进行数据的转换，因为之前保存的String类型数据，parentList初始化：将dataParentList转换为JSONArray类型，通过循环将数据赋值到parentList中；同理，将dataMap转换为JSONObject类型，通过两层for循环将数据赋值到map中。

自定义点击子项监听其类MyOnClickListener：实现ExpandableListView.OnChildClickListener接口，这里就简单的进行Toast操作，读者可以修改为跳转等其他自定义功能；

自定义长按组项或子项监听器类MyOnLongClickListener：实现AdapterView.OnItemLongClickListener接口，通过调用ExpandableListView的getPackedPositionType()方法来判断此时长按的是组项还是子项；这里将长按组和子项分离出来，方便根据功能修改；无论是组项还是子项长按后，都调用alertModifyDialog()弹修改对话框，传入当前项的名称；

新增组addGroup函数：将传递过来的newGroupName，添加parentList中，且定义一个空的list，绑定newGroupName，将这对string和list，添加到map中；最后，调用adapter.notifyDataSetChanged()刷新列表，调用saveData()保存数据到ShareReference；

同理，新增子项到指定组addChild()，删除指定组deleteGroup()，删除指定子项deleteChild()，都是对parentList和map进行操作，最后刷新列表和保存数据；

修改该项名称modifyName():通过传递过来childPosition进行判断，当修改项为组项时，childPosition的值为-1，以此区分组项和子项；这里遇到一个问题，当组项提交的名称与原名称相同会报错，故添加一个判断，仅提交的名称不同时才进行修改操作；修改的具体实现还是对parentList和map的操作，以修改组项为例，同新增组，添加一个modifyName的组，其对应的List为原来组名对应的List数据，然后再将原来的groupName组及其对应的list删除，实现修改；最后同样要刷新列表和保存数据；

弹修改对话框alertModifyDialog()函数：首先对自定义的dialog进行实例化，初始化标题和输入框中的数据；调用getEditText()函数获取输入框实例，添加提交按钮点击事件，调用modifyName方法传入当前组和子项数据，以及输入框中提交的文本；

弹新增组对话框alertAddDialog()函数：同样，实例化dialog，获取输入框控件，点击事件中调用addGroup()方法添加数据；

保存数据saveData()函数：将parentList和map数据转化为String类型，分别赋值，保存至ShareReference的Editor中并提交；

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