Android仿QQ好友列表分組實現增刪改及持久化

Android自帶的控件ExpandableListView實現了分組列表功能，本案例在此基礎上進行優化，為此控件添加增刪改分組及子項的功能，以及列表數據的持久化。

Demo實現效果：

GroupListDemo具體實現：

①demo中將列表頁面設計為Fragment頁面，方便後期調用；在主界面MainActivity中動態添加GroupListFragment頁面；

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(); 
   
 } 
} 

動態添加GroupListFragment實例到界面的fragContainer布局中；將fragment聲明為static用於在Adapter中組添加子項時進行調用。

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" 
 android:orientation="vertical" > 
 <RelativeLayout 
  android:id="@+id/fragContainer" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  > 
 </RelativeLayout> 
</LinearLayout> 

②實現自定義適配器類MyAdapter，繼承自BaseExpandableListAdapter；組項布局及子項布局；

list_item_parent.xml組項布局文件，展開圖標及名稱，增刪圖標；

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="match_parent" 
 android:layout_height="50dp" 
 android:background="#0099ff" 
 android:orientation="horizontal"> 
 <ImageView 
  android:id="@+id/image_parent" 
  android:layout_width="50dp" 
  android:layout_height="50dp" 
  android:src="@drawable/image_parent1"/> 
 <TextView 
  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"/> 
 <ImageView 
  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"/> 
 <ImageView 
  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"/> 
</RelativeLayout>

list_item_child.xml子項布局文件，名稱及刪除圖標；

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="match_parent" 
 android:layout_height="40dp" 
 > 
 <TextView 
  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"/> 
 <ImageView 
  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"/> 
</RelativeLayout> 

MyAdapter.java自定義適配器

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<String> parentList; 
 private Map<String,List<String>> map; 
 private Context context; 
 private EditText edit_modify; 
 private ModifyDialog dialog; 
  
 //構造函數 
 public MyAdapter(Context context, List<String> parentList, Map<String,List<String>> map) { 
  this.context = context; 
  this.parentList = parentList; 
  this.map = map; 
 } 
  
 //獲取分組數 
 @Override 
 public int getGroupCount() { 
  return parentList.size(); 
 } 
 //獲取當前組的子項數 
 @Override 
 public int getChildrenCount(int groupPosition) { 
  String groupName = parentList.get(groupPosition); 
  int childCount = map.get(groupName).size(); 
  return childCount; 
 } 
 //獲取當前組對象 
 @Override 
 public Object getGroup(int groupPosition) { 
  String groupName = parentList.get(groupPosition); 
  return groupName; 
 } 
 //獲取當前子項對象 
 @Override 
 public Object getChild(int groupPosition, int childPosition) { 
  String groupName = parentList.get(groupPosition); 
  String chidlName = map.get(groupName).get(childPosition); 
  return chidlName; 
 } 
 //獲取組ID 
 @Override 
 public long getGroupId(int groupPosition) { 
  return groupPosition; 
 } 
 //獲取子項ID 
 @Override 
 public long getChildId(int groupPosition, int childPosition) { 
  return childPosition; 
 } 
 
 @Override 
 public boolean hasStableIds() { 
  return true; 
 } 
 //組視圖初始化 
 @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(), "新增子項", 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; 
 } 
 //子項視圖初始化 
 @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; 
 } 
  
 //彈新增子項對話框 
 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(); 
 } 
} 

構造函數：將傳入的parentList和map進行數據同步，parentList保存組數據，map保存對應組及其子項list數據；
獲取分組數及子項數等很簡單，就不介紹了，主要講述一下，組視圖初始化和子項視圖初始化這兩個函數；

組視圖初始化getGroupView()：盡量復用convertView防止內存洩露，首先是進行判斷，若convertView為空，則進行組視圖初始化，加載list_item_parent子項布局；獲取到相應的組布局控件：展開圖標image、添加圖標image_add、刪除圖標image_delete；通過傳遞過來的布爾類型參數isExpanded，進行判斷給image賦值展開圖標或合並圖標；分別給添加圖標和刪除圖標添加點擊事件，分別調用GroupListFragment中的彈出添加窗口函數alertAddDialog()和刪除組函數deleteGroup()；

子項視圖初始化getChildView()：同樣盡量復用convertView防止內存洩露，首先是進行判斷，若convertView為空，則進行子項視圖初始化，加載list_item_child子項布局；獲取到相應的子布局控件：內容文本ChildText和刪除圖標Image_delete；從parentList和map中分別獲取到，當前子項的組名parentName和子項名childName，賦值ChildText，刪除圖標添加點擊事件，調用刪除子項函數deleteChild()；

③實現自定義對話框類ModifyDialog，繼承自Dialog類，對輸入修改內容，或新增項內容進行過渡；

no_title_dialog.xml，在values目錄下自定義Dialog的style類型xml，除去Dialog的標題欄；

<?xml version="1.0" encoding="utf-8"?> 
<resources xmlns:android="http://schemas.android.com/apk/res/android"> 
 <style name="noTitleDialog" parent="android:style/Theme.Dialog"> 
  <item name="android:width">300dp</item> 
  <item name="android:height">40dp</item> 
  <item name="android:windowNoTitle">true</item> 
 </style> 
</resources> 

dialog_modify.xml 自定義對話框的布局文件，標題文本，輸入框，確定按鈕；

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" 
 android:orientation="vertical" > 
 <TextView 
  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="修改名稱" 
  android:textColor="#FFF" 
  android:textSize="20sp"/> 
 <EditText 
  android:id="@+id/edit_modify" 
  android:layout_width="match_parent" 
  android:layout_height="wrap_content" 
  android:text="組名稱"/> 
 <Button 
  android:id="@+id/btn_commit" 
  android:layout_width="match_parent" 
  android:layout_height="wrap_content" 
  android:text="確定" 
  android:textColor="#FFF" 
  android:background="#0099ff" 
  /> 
</LinearLayout> 

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自定義構造函數中，通過super()加載剛剛自定義的no_title_dialog.xml，聲明View加載layout布局dialog_modify.xml;並且獲取布局中的相應控件，將構造函數中傳來的字符串title和name，分別賦值到標題文本和輸入框控件中；最後調用setContentView()初始化對話框視圖；
添加一個返回輸入框控件的函數getEditText()，用於獲取輸入框輸入的內容；

還需要一個自定義的點擊事件監聽器，綁定在確定按鈕上； 

④准備工作都完成了，下面就實現GroupListFragment，包括數據的初始化及持久化保存，組項和子項的增刪改操作，列表子項點擊事件，列表組項和子項的長按事件； 

fragment_group_list.xml 頁面的布局文件ExpandableListView列表以及一個添加組圖標；

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" 
 > 
 <ExpandableListView 
  android:id="@+id/expandablelistview" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:groupIndicator="@null" 
  > 
 </ExpandableListView> 
 <ImageView 
  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"/> 
</RelativeLayout> 

這裡需要將ExpandableListView的groupIndicator屬性設置為@null，不使用其自帶的展開圖標；

GroupListFragment.java 加載列表的頁面

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<String> parentList; 
 public static Map<String,List<String>> 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(), "新增組"); 
   } 
  }); 
   
  initData(); 
   
  adapter = new MyAdapter(getActivity().getApplicationContext(), parentList, map); 
  expandableListView.setAdapter(adapter); 
   
  //設置子項點擊事件 
  MyOnClickListener myListener = new MyOnClickListener(); 
  expandableListView.setOnChildClickListener(myListener); 
   
  //設置長按點擊事件 
  MyOnLongClickListener myLongListener = new MyOnLongClickListener(); 
  expandableListView.setOnItemLongClickListener(myLongListener); 
   
  return view; 
 } 
  
 public void initData(){ 
  map = new HashMap<String, List<String>>(); 
  parentList = new ArrayList<String>(); 
   
  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<String>(); 
   parentList.add("客廳"); 
   parentList.add("廚房"); 
   parentList.add("臥室"); 
   
   List<String> list1 = new ArrayList<String>(); 
   list1.add("客廳空調"); 
   list1.add("客廳電視"); 
   list1.add("客廳電燈"); 
   map.put("客廳", list1); 
  
   List<String> list2 = new ArrayList<String>(); 
   list2.add("廚房油煙機"); 
   list2.add("廚房電燈"); 
   list2.add("廚房電器"); 
   map.put("廚房", list2); 
  
   List<String> list3 = new ArrayList<String>(); 
   list3.add("臥室空調"); 
   list3.add("臥室燈光"); 
   list3.add("臥室電視"); 
   map.put("臥室", 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<String> list = new ArrayList<String>(); 
     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轉Map或List出錯"+e); 
   } 
  } 
  Log.e("eric", dataMap+"!&&!"+dataParentList); 
  saveData(); 
 } 
  
 //自定義點擊監聽事件 
 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; 
  } 
 } 
  
 //自定義長按監聽事件 
 public class MyOnLongClickListener implements AdapterView.OnItemLongClickListener{ 
  @Override 
  public boolean onItemLongClick(AdapterView<?> parent, View view, 
    int position, long id) { 
   //長按子項 
   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("修改此項名稱",str); 
    Toast.makeText(getActivity(),str,Toast.LENGTH_SHORT).show(); 
    return true; 
   //長按組 
   }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("修改組名稱", group); 
     
    String str = (String)adapter.getGroup(groupPosition); 
    Toast.makeText(getActivity(),str,Toast.LENGTH_SHORT).show(); 
   } 
    return false; 
   } 
 } 
  
 //新增組 
 public static void addGroup(String newGroupName){ 
  parentList.add(newGroupName); 
  List<String> list = new ArrayList<String>(); 
  map.put(newGroupName, list); 
  adapter.notifyDataSetChanged(); 
  saveData(); 
 } 
  
 //新增子項到指定組 
 public static void addChild(int groupPosition, String newChildName){ 
  String groupName = parentList.get(groupPosition); 
  List<String> list = map.get(groupName); 
  list.add(newChildName); 
  adapter.notifyDataSetChanged(); 
  saveData(); 
 } 
  
 //刪除指定組 
 public static void deleteGroup(int groupPos){ 
  String groupName = parentList.get(groupPos); 
  map.remove(groupName); 
  parentList.remove(groupPos); 
  adapter.notifyDataSetChanged(); 
  saveData(); 
 } 
 //刪除指定子項 
 public static void deleteChild(int groupPos, int childPos){ 
  String groupName = parentList.get(groupPos); 
  List<String> list = map.get(groupName); 
  list.remove(childPos); 
  adapter.notifyDataSetChanged(); 
  saveData(); 
 } 
  
 //修改該項名稱 
 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){ 
   //修改組名稱 
   String groupName = parentList.get(groupPosition); 
   if(!groupName.equals(modifyName)){ 
    map.put(modifyName, map.get(groupName)); 
    map.remove(groupName); 
    parentList.set(groupPosition, modifyName); 
   } 
    
  }else{ 
   //修改子項名稱 
   String group = parentList.get(groupPosition); 
   List<String> list =map.get(group); 
   list.set(childPosition, modifyName); 
   map.put(group, list); 
  } 
  adapter.notifyDataSetChanged(); 
  saveData(); 
 } 
  
 //彈修改對話框 
 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(); 
 } 
  
 //彈新增組對話框 
 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(); 
 } 
  
 //保存數據 
 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(); 
 } 
  
} 

內容有點多，一個個來：

初始化Fragment頁面函數onCreateView():

首先，要進行layout布局fragment_group_list.xml加載，獲取相應控件的實例，expandableListView列表控件以及添加組圖標image_add，添加組圖標添加點擊事件；調用initData()方法進行組數據parentList和組對應子項map的初始化；然後，實例化adapter傳入parentList和map數據到自定義適配器MyAdapter中，並將其綁定到expandableListView上；最後，給expandableListView添加自定義子項點擊事件監聽器，組項和子項長按事件監聽器；

初始化數據函數initData():該函數通過ShareReference來保存數據；

首先，實例化parentList和map，從ShareReference中獲取到保存的String類型的parentList和map實際數據，賦值到dataMap和dataParentList中，若當中數據不存在，默認返回null，第一次運行程序的時候肯定是沒有數據的，故進行判斷，若沒獲取到數據，那就給parentList和Map賦值“客廳”、“廚房”、“臥室”等一系列數據；如果有數據的話，那就得進行數據的轉換，因為之前保存的String類型數據，parentList初始化：將dataParentList轉換為JSONArray類型，通過循環將數據賦值到parentList中；同理，將dataMap轉換為JSONObject類型，通過兩層for循環將數據賦值到map中。

自定義點擊子項監聽其類MyOnClickListener：實現ExpandableListView.OnChildClickListener接口，這裡就簡單的進行Toast操作，讀者可以修改為跳轉等其他自定義功能；

自定義長按組項或子項監聽器類MyOnLongClickListener：實現AdapterView.OnItemLongClickListener接口，通過調用ExpandableListView的getPackedPositionType()方法來判斷此時長按的是組項還是子項；這裡將長按組和子項分離出來，方便根據功能修改；無論是組項還是子項長按後，都調用alertModifyDialog()彈修改對話框，傳入當前項的名稱；
新增組addGroup函數：將傳遞過來的newGroupName，添加parentList中，且定義一個空的list，綁定newGroupName，將這對string和list，添加到map中；最後，調用adapter.notifyDataSetChanged()刷新列表，調用saveData()保存數據到ShareReference；

同理，新增子項到指定組addChild()，刪除指定組deleteGroup()，刪除指定子項deleteChild()，都是對parentList和map進行操作，最後刷新列表和保存數據；

修改該項名稱modifyName():通過傳遞過來childPosition進行判斷，當修改項為組項時，childPosition的值為-1，以此區分組項和子項；這裡遇到一個問題，當組項提交的名稱與原名稱相同會報錯，故添加一個判斷，僅提交的名稱不同時才進行修改操作；修改的具體實現還是對parentList和map的操作，以修改組項為例，同新增組，添加一個modifyName的組，其對應的List為原來組名對應的List數據，然後再將原來的groupName組及其對應的list刪除，實現修改；最後同樣要刷新列表和保存數據；

彈修改對話框alertModifyDialog()函數：首先對自定義的dialog進行實例化，初始化標題和輸入框中的數據；調用getEditText()函數獲取輸入框實例，添加提交按鈕點擊事件，調用modifyName方法傳入當前組和子項數據，以及輸入框中提交的文本；
彈新增組對話框alertAddDialog()函數：同樣，實例化dialog，獲取輸入框控件，點擊事件中調用addGroup()方法添加數據；

保存數據saveData()函數：將parentList和map數據轉化為String類型，分別賦值，保存至ShareReference的Editor中並提交；

以上就是本文的全部內容，希望對大家的學習有所幫助。