本文介绍了如何在android中的ExpandableListView中添加三级ListView的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想在 ExpandableListView 中再添加一层.在当前的 ExpandableListView 是两层，我如何才能再添加一层.我是 android 开发新手，请帮助我.提前致谢！
我的 MainActivity.java:-
私有工具栏 mToolbar;ExpandableListAdapter listAdapter;ExpandableListView expListView;列表列表数据头；HashMap>listDataChild;//私有 FragmentDrawer drawerFragment;ArrayList数组列表1、数组列表2、数组列表3、数组列表4、数组列表5；int cnt = 0;@覆盖protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mToolbar = (工具栏) findViewById(R.id.toolbar);setSupportActionBar(mToolbar);getSupportActionBar().setDisplayShowHomeEnabled(true);expListView = (ExpandableListView) findViewById(R.id.lvExp);//准备列表数据准备列表数据()；listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);//设置列表适配器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);*///在应用启动时显示第一个导航抽屉视图//显示视图(0);Log.d("oncreate 方法", "");arraylist1 = 新的 ArrayList();arraylist2 = new ArrayList();arraylist3 = new ArrayList();arrayList4 = new ArrayList();arrayList5 = new ArrayList();new ProductsAsynTask().execute("http://opencart.codeniques.com/shopping/?route=feed/web_api/menu&key=test123$");}私有无效prepareListData(){listDataHeader = new ArrayList();listDataChild = new HashMap>();//添加子数据listDataHeader.add("前 250");listDataHeader.add("现在显示");listDataHeader.add("即将推出..");//添加子数据列表top250 = 新的 ArrayList();top250.add("肖申克的救赎");top250.add("教父");top250.add("教父:第二部分");top250.add("低俗小说");top250.add("好的、坏的和丑的");top250.add("黑暗骑士");top250.add("12 个愤怒的男人");列表nowShowing = new ArrayList();nowShowing.add("招魂");nowShowing.add("卑鄙的我2");nowShowing.add("Turbo");nowShowing.add("Grown Ups 2");nowShowing.add("红2");nowShowing.add("金刚狼");列表comingSoon = new ArrayList();comingSoon.add("2 枪");comingSoon.add("蓝精灵 2");comingSoon.add("现在的壮观");comingSoon.add("峡谷");comingSoon.add("欧洲报告");listDataChild.put(listDataHeader.get(0), top250);//标题，子数据listDataChild.put(listDataHeader.get(1), nowShowing);listDataChild.put(listDataHeader.get(2),comingSoon);}公共类 ProductsAsynTask 扩展了 AsyncTask{ProgressDialog 对话框；受保护的无效 onPreExecute(){super.onPreExecute();Log.d("In onPreExceute","");dialog = new ProgressDialog(MainActivity.this);dialog.setMessage("加载中，请稍候");dialog.setTitle("连接服务器");对话框显示()；dialog.setCancelable(false);}受保护的 Void doInBackground(String... param){尝试{Log.d("在doInBackground","");HttpClient 客户端 = 新的 DefaultHttpClient();HttpPost post = new HttpPost(param[0]);HttpResponse 响应 = client.execute(post);int status = response.getStatusLine().getStatusCode();如果(状态 == 200){Log.d("状态",""+状态);HttpEntity entity = response.getEntity();字符串数据 = EntityUtils.toString(entity);JSONObject jsonObject = new JSONObject(data);JSONArray jArray = jsonObject.getJSONArray("categories");for(int i = 0;i < jArray.length();i++){cnt++;Log.d("数组的值",jArray.length()+"");Log.d("i 的值",""+i);JSONObject jsonObject1 = jArray.getJSONObject(i);arraylist1.add(jsonObject1.getString("name"));//data1 = jsonObject1.getString("name");//Log.d("你好",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("错误 IOException :",e.getMessage());}catch (JSONException e){Log.e("Error JSONException",e.getMessage());}返回空；}protected void onPostExecute(Void aVoid) {super.onPostExecute(aVoid);dialog.dismiss();Log.d("计数器值",""+cnt);}}@覆盖公共布尔 onCreateOptionsMenu(菜单菜单){//给菜单充气；如果它存在，这会将项目添加到操作栏.getMenuInflater().inflate(R.menu.menu_main, menu);返回真；}@覆盖公共布尔 onOptionsItemSelected(MenuItem item) {//在此处处理操作栏项目的点击.操作栏将//自动处理 Home/Up 按钮上的点击，这么长时间//当您在 AndroidManifest.xml 中指定父活动时.int id = item.getItemId();//不检查SimplifiableIfStatement如果(id == R.id.action_settings){返回真；}if(id == R.id.action_search){Toast.makeText(getApplicationContext(), "搜索操作被选中！", Toast.LENGTH_SHORT).show();返回真；}返回 super.onOptionsItemSelected(item);}/* public void onDrawerItemSelected(View view, int position) {显示视图(位置)；}私有无效显示视图(整数位置){片段片段=空；String title = getString(R.string.app_name);开关(位置){案例0:片段 = 新的 HomeFragment();标题 = getString(R.string.title_home);休息;情况1:fragment = new FriendsFragment();title = getString(R.string.title_friends);休息;案例2:片段 = 新消息片段()；标题 = getString(R.string.title_messages);休息;默认:休息;}如果(片段！= null){FragmentManager fragmentManager = getSupportFragmentManager();FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();fragmentTransaction.replace(R.id.container_body, fragment);fragmentTransaction.commit();//设置工具栏标题getSupportActionBar().setTitle(title);}}*/}我的 ExpandableListAdapter.java 在这里:-
public class ExpandableListAdapter extends BaseExpandableListAdapter {私有上下文_context;私人列表_listDataHeader;//标题标题//子标题格式的子数据，子标题private HashMap>_listDataChild;public ExpandableListAdapter(Context context, List listDataHeader,HashMap>列表子数据) {this._context = 上下文；this._listDataHeader = listDataHeader;this._listDataChild = listChildData;}@覆盖公共对象 getChild(int groupPosition, int childPosititon) {返回 this._listDataChild.get(this._listDataHeader.get(groupPosition)).get(childPosititon);}@覆盖public long getChildId(int groupPosition, int childPosition) {返回子位置；}@覆盖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);返回转换视图；}@覆盖公共 int getChildrenCount(int groupPosition) {返回 this._listDataChild.get(this._listDataHeader.get(groupPosition)).尺寸();}@覆盖公共对象 getGroup(int groupPosition) {返回 this._listDataHeader.get(groupPosition);}@覆盖公共 int getGroupCount() {返回 this._listDataHeader.size();}@覆盖公共长 getGroupId(int groupPosition) {返回组位置；}@覆盖公共视图 getGroupView(int groupPosition, boolean isExpanded,视图 convertView，ViewGroup 父级){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);返回转换视图；}@覆盖公共布尔 hasStableIds() {返回假；}@覆盖公共布尔 isChildSelectable(int groupPosition, int childPosition) {返回真；}}我的activity_main.xml在这里:-
I want to add one more level of in ExpandableListView.In current ExpandableListView is two level how can i add one more level. I am new in android developing please help me. Thanks in advance!
My 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);
}
}*/}
My ExpandableListAdapter.java is here:-
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;
}}
My activity_main.xml is here:-
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:id="@+id/container_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<include
android:id="@+id/toolbar"
layout="@layout/toolbar" />
</LinearLayout>
<FrameLayout
android:id="@+id/container_body"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
<ExpandableListView
android:id="@+id/lvExp"
android:layout_height="match_parent"
android:layout_width="260dp"
android:layout_gravity="start"/>
<!-- <fragment
android:id="@+id/fragment_navigation_drawer"
android:name="com.android.ShoppingMazza.activity.ExpandableListAdapter"
android:layout_width="@dimen/nav_drawer_width"
android:layout_height="match_parent"
android:layout_gravity="start"
app:layout="@layout/fragment_navigation_drawer"
tools:layout="@layout/fragment_navigation_drawer" /> -->
</android.support.v4.widget.DrawerLayout>
解决方案 You can try my following sample code. I have posted my full project to GitHub
Of course, you should modify more to meet all your requirements. For basic case, I only use the data source in the arrays.xml file. Hope this helps!
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);
}
}
}
Screenshot result:
这篇关于如何在android中的ExpandableListView中添加三级ListView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！