如何在 android 的 ExpandableListView 中添加三级 ListView
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【中文标题】如何在 android 的 ExpandableListView 中添加三级 ListView【英文标题】：How to add Three Level ListView in ExpandableListView in android 【发布时间】：2015-12-29 01:50:41 【问题描述】：我想在 ExpandableListView 中再添加一层。在当前的 ExpandableListView 是两层时，我该如何再添加一层。我是android开发的新手，请帮助我。提前致谢！
我的 MainActivity.java:-
private Toolbar mToolbar;
ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
// private FragmentDrawer drawerFragment;
ArrayList<String> arraylist1,arraylist2,arraylist3,arrayList4,arrayList5;
int cnt = 0;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
expListView = (ExpandableListView) findViewById(R.id.lvExp);
// preparing list data
prepareListData();
listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);
// setting list adapter
expListView.setAdapter(listAdapter);
/* drawerFragment = (FragmentDrawer)
getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), mToolbar);
drawerFragment.setDrawerListener(this);*/
// display the first navigation drawer view on app launch
// displayView(0);
Log.d("oncreate method", "");
arraylist1 = new ArrayList<String>();
arraylist2 = new ArrayList<String>();
arraylist3 = new ArrayList<String>();
arrayList4 = new ArrayList<String>();
arrayList5 = new ArrayList<String>();
new ProductsAsynTask().execute("http://opencart.codeniques.com/shopping/?route=feed/web_api/menu&key=test123$");
private void prepareListData()
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<String>>();
// Adding child data
listDataHeader.add("Top 250");
listDataHeader.add("Now Showing");
listDataHeader.add("Coming Soon..");
// Adding child data
List<String> top250 = new ArrayList<String>();
top250.add("The Shawshank Redemption");
top250.add("The Godfather");
top250.add("The Godfather: Part II");
top250.add("Pulp Fiction");
top250.add("The Good, the Bad and the Ugly");
top250.add("The Dark Knight");
top250.add("12 Angry Men");
List<String> nowShowing = new ArrayList<String>();
nowShowing.add("The Conjuring");
nowShowing.add("Despicable Me 2");
nowShowing.add("Turbo");
nowShowing.add("Grown Ups 2");
nowShowing.add("Red 2");
nowShowing.add("The Wolverine");
List<String> comingSoon = new ArrayList<String>();
comingSoon.add("2 Guns");
comingSoon.add("The Smurfs 2");
comingSoon.add("The Spectacular Now");
comingSoon.add("The Canyons");
comingSoon.add("Europa Report");
listDataChild.put(listDataHeader.get(0), top250); // Header, Child data
listDataChild.put(listDataHeader.get(1), nowShowing);
listDataChild.put(listDataHeader.get(2), comingSoon);
public class ProductsAsynTask extends AsyncTask<String,Void,Void>
ProgressDialog dialog;
protected void onPreExecute()
super.onPreExecute();
Log.d("In onPreExceute","");
dialog = new ProgressDialog(MainActivity.this);
dialog.setMessage("Loading, Please wait");
dialog.setTitle("Connecting server");
dialog.show();
dialog.setCancelable(false);
protected Void doInBackground(String... param)
try
Log.d("In doInBackground","");
HttpClient client= new DefaultHttpClient();
HttpPost post = new HttpPost(param[0]);
HttpResponse response = client.execute(post);
int status = response.getStatusLine().getStatusCode();
if(status == 200)
Log.d("Status",""+status);
HttpEntity entity = response.getEntity();
String data = EntityUtils.toString(entity);
JSONObject jsonObject = new JSONObject(data);
JSONArray jArray = jsonObject.getJSONArray("categories");
for(int i = 0;i < jArray.length();i++)
cnt++;
Log.d("value of array",jArray.length()+"");
Log.d("Value of i",""+i);
JSONObject jsonObject1 = jArray.getJSONObject(i);
arraylist1.add(jsonObject1.getString("name"));
//data1 = jsonObject1.getString("name");
// Log.d("hello ",data1);
JSONArray jsonArray = jsonObject1.getJSONArray("children");
// JSONObject jsonObject2 = jsonObject1.getJSONObject("children");
for(int j=0;j<jsonArray.length();j++)
JSONObject jsonObject2 = jsonArray.getJSONObject(j);
arraylist2.add(jsonObject2.getString("name"));
// data2 = jsonObject2.getString("name");
JSONArray jsonArray1 = jsonObject2.getJSONArray("children_lv3");
for(int k=0;k<jsonArray1.length();k++)
JSONObject jsonObject3 = jsonArray1.getJSONObject(k);
arraylist3.add(jsonObject3.getString("name"));
arrayList4.add(jsonObject3.getString("href"));
/* data3 = jsonObject3.getString("name");
data4 = jsonObject3.getString("href"); */
arrayList5.add(jsonObject2.getString("href"));
// data5 = jsonObject2.getString("href");
catch(IOException e)
Log.e("Error IOException :",e.getMessage());
catch (JSONException e)
Log.e("Error JSONException",e.getMessage());
return null;
protected void onPostExecute(Void aVoid)
super.onPostExecute(aVoid);
dialog.dismiss();
Log.d("Counter value",""+cnt);
@Override
public boolean onCreateOptionsMenu(Menu menu)
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
@Override
public boolean onOptionsItemSelected(MenuItem item)
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings)
return true;
if(id == R.id.action_search)
Toast.makeText(getApplicationContext(), "Search action is selected!", Toast.LENGTH_SHORT).show();
return true;
return super.onOptionsItemSelected(item);
/* public void onDrawerItemSelected(View view, int position)
displayView(position);
private void displayView(int position)
Fragment fragment = null;
String title = getString(R.string.app_name);
switch (position)
case 0:
fragment = new HomeFragment();
title = getString(R.string.title_home);
break;
case 1:
fragment = new FriendsFragment();
title = getString(R.string.title_friends);
break;
case 2:
fragment = new MessagesFragment();
title = getString(R.string.title_messages);
break;
default:
break;
if (fragment != null)
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.container_body, fragment);
fragmentTransaction.commit();
// set the toolbar title
getSupportActionBar().setTitle(title);
*/
我的 ExpandableListAdapter.java 在这里：-
public class ExpandableListAdapter extends BaseExpandableListAdapter
private Context _context;
private List<String> _listDataHeader; // header titles
// child data in format of header title, child title
private HashMap<String, List<String>> _listDataChild;
public ExpandableListAdapter(Context context, List<String> listDataHeader,
HashMap<String, List<String>> listChildData)
this._context = context;
this._listDataHeader = listDataHeader;
this._listDataChild = listChildData;
@Override
public Object getChild(int groupPosition, int childPosititon)
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.get(childPosititon);
@Override
public long getChildId(int groupPosition, int childPosition)
return childPosition;
@Override
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent)
final String childText = (String) getChild(groupPosition, childPosition);
if (convertView == null)
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.list_item, null);
TextView txtListChild = (TextView) convertView
.findViewById(R.id.lblListItem);
txtListChild.setText(childText);
return convertView;
@Override
public int getChildrenCount(int groupPosition)
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.size();
@Override
public Object getGroup(int groupPosition)
return this._listDataHeader.get(groupPosition);
@Override
public int getGroupCount()
return this._listDataHeader.size();
@Override
public long getGroupId(int groupPosition)
return groupPosition;
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent)
String headerTitle = (String) getGroup(groupPosition);
if (convertView == null)
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.list_group, null);
TextView lblListHeader = (TextView) convertView
.findViewById(R.id.lblListHeader);
lblListHeader.setTypeface(null, Typeface.BOLD);
lblListHeader.setText(headerTitle);
return convertView;
@Override
public boolean hasStableIds()
return false;
@Override
public boolean isChildSelectable(int groupPosition, int childPosition)
return true;
我的 activity_main.xml 在这里：-
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_
android:layout_>
<LinearLayout
android:layout_
android:layout_
android:orientation="vertical">
<LinearLayout
android:id="@+id/container_toolbar"
android:layout_
android:layout_
android:orientation="vertical">
<include
android:id="@+id/toolbar"
layout="@layout/toolbar" />
</LinearLayout>
<FrameLayout
android:id="@+id/container_body"
android:layout_
android:layout_
android:layout_weight="1" />
</LinearLayout>
<ExpandableListView
android:id="@+id/lvExp"
android:layout_
android:layout_
android:layout_gravity="start"/>
<!-- <fragment
android:id="@+id/fragment_navigation_drawer"
android:name="com.android.ShoppingMazza.activity.ExpandableListAdapter"
android:layout_
android:layout_
android:layout_gravity="start"
app:layout="@layout/fragment_navigation_drawer"
tools:layout="@layout/fragment_navigation_drawer" /> -->
</android.support.v4.widget.DrawerLayout>
【问题讨论】：
结帐github.com/shahbazhashmi/nested-expandable-recyclerview 【参考方案1】：你可以试试我下面的示例代码。我已将我的完整项目发布到GitHub
当然，您应该进行更多修改以满足您的所有要求。对于基本情况，我只使用arrays.xml 文件中的数据源。希望这会有所帮助！
arrays.xml：
<resources>
<string-array name="items_array_expandable_level_one">
<item>Level 1.1</item>
<item>Level 1.2</item>
<item>Level 1.3</item>
</string-array>
<string-array name="items_array_expandable_level_one_one_child">
<item>Level 1.1.1</item>
<item>Level 1.1.2</item>
</string-array>
<string-array name="items_array_expandable_level_one_two_child">
<item>Level 1.2.1</item>
</string-array>
<string-array name="items_array_expandable_other_child">
<item>Second Level 01</item>
<item>Second Level 02</item>
<item>Second Level 03</item>
</string-array>
<string-array name="items_array_expandable_level_three">
<item>Child Level 01</item>
<item>Child Level 02</item>
</string-array>
</resources>
CustomExpListView.java：
public class CustomExpListView extends ExpandableListView
public CustomExpListView(Context context)
super(context);
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
widthMeasureSpec = MeasureSpec.makeMeasureSpec(960, MeasureSpec.AT_MOST);
heightMeasureSpec = MeasureSpec.makeMeasureSpec(600, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
ParentLevelAdapter.java：
public class ParentLevelAdapter extends BaseExpandableListAdapter
private final Context mContext;
private final List<String> mListDataHeader;
private final Map<String, List<String>> mListData_SecondLevel_Map;
private final Map<String, List<String>> mListData_ThirdLevel_Map;
public ParentLevelAdapter(Context mContext, List<String> mListDataHeader)
this.mContext = mContext;
this.mListDataHeader = new ArrayList<>();
this.mListDataHeader.addAll(mListDataHeader);
// Init second level data
String[] mItemHeaders;
mListData_SecondLevel_Map = new HashMap<>();
int parentCount = mListDataHeader.size();
for (int i = 0; i < parentCount; i++)
String content = mListDataHeader.get(i);
switch (content)
case "Level 1.1":
mItemHeaders = mContext.getResources().getStringArray(R.array.items_array_expandable_level_one_one_child);
break;
case "Level 1.2":
mItemHeaders = mContext.getResources().getStringArray(R.array.items_array_expandable_level_one_two_child);
break;
default:
mItemHeaders = mContext.getResources().getStringArray(R.array.items_array_expandable_other_child);
mListData_SecondLevel_Map.put(mListDataHeader.get(i), Arrays.asList(mItemHeaders));
// THIRD LEVEL
String[] mItemChildOfChild;
List<String> listChild;
mListData_ThirdLevel_Map = new HashMap<>();
for (Object o : mListData_SecondLevel_Map.entrySet())
Map.Entry entry = (Map.Entry) o;
Object object = entry.getValue();
if (object instanceof List)
List<String> stringList = new ArrayList<>();
Collections.addAll(stringList, (String[]) ((List) object).toArray());
for (int i = 0; i < stringList.size(); i++)
mItemChildOfChild = mContext.getResources().getStringArray(R.array.items_array_expandable_level_three);
listChild = Arrays.asList(mItemChildOfChild);
mListData_ThirdLevel_Map.put(stringList.get(i), listChild);
@Override
public Object getChild(int groupPosition, int childPosition)
return childPosition;
@Override
public long getChildId(int groupPosition, int childPosition)
return childPosition;
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent)
final CustomExpListView secondLevelExpListView = new CustomExpListView(this.mContext);
String parentNode = (String) getGroup(groupPosition);
secondLevelExpListView.setAdapter(new SecondLevelAdapter(this.mContext, mListData_SecondLevel_Map.get(parentNode), mListData_ThirdLevel_Map));
secondLevelExpListView.setGroupIndicator(null);
return secondLevelExpListView;
@Override
public int getChildrenCount(int groupPosition)
return 1;
@Override
public Object getGroup(int groupPosition)
return this.mListDataHeader.get(groupPosition);
@Override
public int getGroupCount()
return this.mListDataHeader.size();
@Override
public long getGroupId(int groupPosition)
return groupPosition;
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent)
String headerTitle = (String) getGroup(groupPosition);
if (convertView == null)
LayoutInflater layoutInflater = (LayoutInflater) this.mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.drawer_list_group, parent, false);
TextView lblListHeader = (TextView) convertView
.findViewById(R.id.lblListHeader);
lblListHeader.setTypeface(null, Typeface.BOLD);
lblListHeader.setTextColor(Color.CYAN);
lblListHeader.setText(headerTitle);
return convertView;
@Override
public boolean hasStableIds()
return true;
@Override
public boolean isChildSelectable(int groupPosition, int childPosition)
return true;
SecondLevelAdapter.java：
public class SecondLevelAdapter extends BaseExpandableListAdapter
private final Context mContext;
private final List<String> mListDataHeader;
private final Map<String, List<String>> mListDataChild;
public SecondLevelAdapter(Context mContext, List<String> mListDataHeader, Map<String, List<String>> mListDataChild)
this.mContext = mContext;
this.mListDataHeader = mListDataHeader;
this.mListDataChild = mListDataChild;
@Override
public Object getChild(int groupPosition, int childPosition)
return this.mListDataChild.get(this.mListDataHeader.get(groupPosition))
.get(childPosition);
@Override
public long getChildId(int groupPosition, int childPosition)
return childPosition;
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent)
final String childText = (String) getChild(groupPosition, childPosition);
if (convertView == null)
LayoutInflater layoutInflater = (LayoutInflater) this.mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.drawer_list_item, parent, false);
TextView txtListChild = (TextView) convertView
.findViewById(R.id.lblListItem);
txtListChild.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 15);
txtListChild.setText(childText);
return convertView;
@Override
public int getChildrenCount(int groupPosition)
try
return this.mListDataChild.get(this.mListDataHeader.get(groupPosition)).size();
catch (Exception e)
return 0;
@Override
public Object getGroup(int groupPosition)
return this.mListDataHeader.get(groupPosition);
@Override
public int getGroupCount()
return this.mListDataHeader.size();
@Override
public long getGroupId(int groupPosition)
return groupPosition;
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent)
String headerTitle = (String) getGroup(groupPosition);
if (convertView == null)
LayoutInflater layoutInflater = (LayoutInflater) this.mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.drawer_list_group_second, parent, false);
TextView lblListHeader = (TextView) convertView
.findViewById(R.id.lblListHeader);
lblListHeader.setText(headerTitle);
lblListHeader.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 18);
lblListHeader.setTextColor(Color.YELLOW);
return convertView;
@Override
public boolean hasStableIds()
return true;
@Override
public boolean isChildSelectable(int groupPosition, int childPosition)
return true;
MainActivity.java：
public class MainActivity extends AppCompatActivity
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.content_main);
// Init top level data
List<String> listDataHeader = new ArrayList<>();
String[] mItemHeaders = getResources().getStringArray(R.array.items_array_expandable_level_one);
Collections.addAll(listDataHeader, mItemHeaders);
ExpandableListView mExpandableListView = (ExpandableListView) findViewById(R.id.expandableListView_Parent);
if (mExpandableListView != null)
ParentLevelAdapter parentLevelAdapter = new ParentLevelAdapter(this, listDataHeader);
mExpandableListView.setAdapter(parentLevelAdapter);
截图结果：
【讨论】：
此列表包含我想要在工具栏下方列出的全宽 当然，如截图，action bar下方的列表，如果要全高屏，用NavigationView代替 @bc120201817ZohaibSiddiq，在return secondLevelExpListView;行上方，可以加secondLevelExpListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() @Override public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) String seletectText = ((TextView) v).getText().toString().toLowerCase(); Toast.makeText(mContext, seletectText, Toast.LENGTH_SHORT).show(); return false; );
谢谢，这（与 github 存储库一起）非常有帮助。有时我也希望看到使用游标实现它；例如使用 SimpleCursorTreeAdapter。这样数据就可以来自数据库。
@LarsH 谢谢，其实我现在正忙于我的项目，所以在未来，如果您实施或找到该解决方案，请分享:)【参考方案2】：
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_
android:layout_>
<ExpandableListView
android:layout_
android:id="@+id/ParentLevel"
android:groupIndicator="@null"
android:layout_>
</ExpandableListView>
</LinearLayout>
MainActivity.Java
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.LinearLayout.LayoutParams;
public class Home extends Activity
ExpandableListView explvlist;
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
explvlist = (ExpandableListView)findViewById(R.id.ParentLevel);
explvlist.setAdapter(new ParentLevel());
public class ParentLevel extends BaseExpandableListAdapter
@Override
public Object getChild(int arg0, int arg1)
return arg1;
@Override
public long getChildId(int groupPosition, int childPosition)
return childPosition;
@Override
public View getChildView(int groupPosition, int childPosition,boolean isLastChild, View convertView, ViewGroup parent)
CustExpListview SecondLevelexplv = new CustExpListview(Home.this);
SecondLevelexplv.setAdapter(new SecondLevelAdapter());
SecondLevelexplv.setGroupIndicator(null);
return SecondLevelexplv;
@Override
public int getChildrenCount(int groupPosition)
return 3;
@Override
public Object getGroup(int groupPosition)
return groupPosition;
@Override
public int getGroupCount()
return 5;
@Override
public long getGroupId(int groupPosition)
return groupPosition;
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent)
TextView tv = new TextView(Home.this);
tv.setText("->FirstLevel");
tv.setBackgroundColor(Color.BLUE);
tv.setPadding(10, 7, 7, 7);
return tv;
@Override
public boolean hasStableIds()
return true;
@Override
public boolean isChildSelectable(int groupPosition, int childPosition)
return true;
public class CustExpListview extends ExpandableListView
int intGroupPosition, intChildPosition, intGroupid;
public CustExpListview(Context context)
super(context);
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
widthMeasureSpec = MeasureSpec.makeMeasureSpec(960, MeasureSpec.AT_MOST);
heightMeasureSpec = MeasureSpec.makeMeasureSpec(600, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
public class SecondLevelAdapter extends BaseExpandableListAdapter
@Override
public Object getChild(int groupPosition, int childPosition)
return childPosition;
@Override
public long getChildId(int groupPosition, int childPosition)
return childPosition;
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent)
TextView tv = new TextView(Home.this);
tv.setText("child");
tv.setPadding(15, 5, 5, 5);
tv.setBackgroundColor(Color.YELLOW);
tv.setLayoutParams(new ListView.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
return tv;
@Override
public int getChildrenCount(int groupPosition)
return 5;
@Override
public Object getGroup(int groupPosition)
return groupPosition;
@Override
public int getGroupCount()
return 1;
@Override
public long getGroupId(int groupPosition)
return groupPosition;
@Override
public View getGroupView(int groupPosition, boolean isExpanded,View convertView, ViewGroup parent)
TextView tv = new TextView(Home.this);
tv.setText("-->Second Level");
tv.setPadding(12, 7, 7, 7);
tv.setBackgroundColor(Color.RED);
return tv;
@Override
public boolean hasStableIds()
// TODO Auto-generated method stub
return true;
@Override
public boolean isChildSelectable(int groupPosition, int childPosition)
// TODO Auto-generated method stub
return true;
【讨论】：
【参考方案3】：在这种情况下，您应该创建自己的 Expandable 类。
参考此链接。 http://androidcodesnips.blogspot.in/2011/09/three-level-expandable-list.html
【讨论】：
在您的代码中，子菜单计数在所有父菜单中都相同【参考方案4】：再创建一个扩展 BaseExpandableListAdapter 的可扩展列表适配器，并在您的 ExpandableListAdapter getChildView() 中调用新的可扩展列表适配器。
我已经使用以下链接实现了相同的功能： https://github.com/talhahasanzia/Three-Level-Expandable-Listview
【讨论】：
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