模拟QQ分组（具有伸缩功能） SimpleExpandableListAdapter 适配器的用法，并且可添加组及其组内数据。

  1 package com.lixu.qqfenzu;
  2 
  3 import java.util.ArrayList;
  4 import java.util.HashMap;
  5 import java.util.List;
  6 import java.util.Map;
  7 
  8 import android.app.Activity;
  9 import android.content.Context;
 10 import android.graphics.Color;
 11 import android.os.Bundle;
 12 import android.view.LayoutInflater;
 13 import android.view.View;
 14 import android.view.View.OnClickListener;
 15 import android.view.ViewGroup;
 16 import android.widget.Button;
 17 import android.widget.EditText;
 18 import android.widget.ExpandableListView;
 19 import android.widget.ExpandableListView.OnGroupClickListener;
 20 import android.widget.SimpleExpandableListAdapter;
 21 import android.widget.TextView;
 22 
 23 public class MainActivity extends Activity {
 24     private ArrayList<HashMap<String, Object>> date;
 25     private final String GROUP = "group";
 26     private final String CHILD = "child";
 27     EditText et;
 28     MyExpandableListAdapter mExpandableListAdapter = null;
 29 
 30     @Override
 31     protected void onCreate(Bundle savedInstanceState) {
 32         super.onCreate(savedInstanceState);
 33         setContentView(R.layout.activity_main);
 34 
 35         Button btn1 = (Button) findViewById(R.id.btn);
 36         Button btn2 = (Button) findViewById(R.id.btn1);
 37         et = (EditText) findViewById(R.id.et);
 38 
 39         ExpandableListView elv = (ExpandableListView) findViewById(R.id.elv);
 40 
 41         btn1.setOnClickListener(new OnClickListener() {
 42 
 43             @Override
 44             public void onClick(View v) {
 45                 addGroup(2);
 46             }
 47         });
 48         btn2.setOnClickListener(new OnClickListener() {
 49 
 50             @Override
 51             public void onClick(View v) {
 52                 addChild(1);
 53             }
 54         });
 55 
 56         String[] group = { "家人", "朋友", "同事", "同学" };
 57         String[] name = { "张三", "李四", "王五", "狗儿" };
 58 
 59         date = new ArrayList<HashMap<String, Object>>();
 60 
 61         for (String n : group) {
 62             HashMap<String, Object> map = new HashMap<String, Object>();
 63 
 64             map.put(GROUP, n);
 65 
 66             ArrayList<String> child = new ArrayList<String>();
 67             for (String n1 : name) {
 68                 child.add(n1);
 69             }
 70 
 71             map.put(CHILD, child);
 72             date.add(map);
 73 
 74         }
 75 
 76         mExpandableListAdapter = new MyExpandableListAdapter(this, null, 0, 0, null, null, null, 0, 0, null, null);
 77         elv.setAdapter(mExpandableListAdapter);
 78         // 去掉下拉小箭头
 79         elv.setGroupIndicator(null);
 80 
 81         // 展开0组
 82         // elv.expandGroup(0);
 83         // 收起1组
 84         // elv.collapseGroup(1);
 85         // 展开2组
 86         // elv.expandGroup(2);
 87 
 88         elv.setOnGroupClickListener(new OnGroupClickListener() {
 89 
 90             @Override
 91             public boolean onGroupClick(ExpandableListView arg0, View arg1, int arg2, long arg3) {
 92                 return false;
 93             }
 94         });
 95     }
 96 
 97     // 增加组
 98     public void addGroup(int pos) {
 99         String str = et.getText().toString();
100 
101         HashMap<String, Object> map = new HashMap<String, Object>();
102 
103         map.put(GROUP, str);
104 
105         ArrayList<String> child = new ArrayList<String>();
106 
107         map.put(CHILD, child);
108         date.add(pos, map);
109 
110         mExpandableListAdapter.notifyDataSetChanged();
111         et.setText("");
112 
113     }
114 
115     // 增加特定组内数据
116     public void addChild(int pos) {
117         String str = et.getText().toString();
118         // 往第2组内添加数据
119         HashMap<String, Object> map = date.get(1);
120         ArrayList<String> list = (ArrayList<String>) map.get(CHILD);
121         list.add(pos, str);
122 
123         mExpandableListAdapter.notifyDataSetChanged();
124         et.setText("");
125 
126     }
127 
128     private class MyExpandableListAdapter extends SimpleExpandableListAdapter {
129         private LayoutInflater flater = null;
130 
131         public MyExpandableListAdapter(Context context, List<? extends Map<String, ?>> groupData,
132                 int expandedGroupLayout, int collapsedGroupLayout, String[] groupFrom, int[] groupTo,
133                 List<? extends List<? extends Map<String, ?>>> childData, int childLayout, int lastChildLayout,
134                 String[] childFrom, int[] childTo) {
135             super(context, groupData, expandedGroupLayout, collapsedGroupLayout, groupFrom, groupTo, childData,
136                     childLayout, lastChildLayout, childFrom, childTo);
137             flater = LayoutInflater.from(context);
138         }
139 
140         @Override
141         public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView,
142                 ViewGroup parent) {
143             if (convertView == null)
144                 convertView = flater.inflate(android.R.layout.simple_list_item_1, null);
145 
146             TextView tv = (TextView) convertView.findViewById(android.R.id.text1);
147             tv.setText(getChild(groupPosition, childPosition) + "");
148 
149             tv.setTextSize(20);
150 
151             return convertView;
152         }
153 
154         @Override
155         public int getChildrenCount(int groupPosition) {
156 
157             ArrayList<String> items = (ArrayList<String>) date.get(groupPosition).get(CHILD);
158             return items.size();
159         }
160 
161         @Override
162         public int getGroupCount() {
163             return date.size();
164         }
165 
166         @Override
167         public Object getChild(int groupPosition, int childPosition) {
168             ArrayList<String> items = (ArrayList<String>) date.get(groupPosition).get(CHILD);
169             return items.get(childPosition);
170         }
171 
172         @Override
173         public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
174             if (convertView == null)
175                 convertView = flater.inflate(android.R.layout.simple_list_item_1, null);
176 
177             TextView tv = (TextView) convertView.findViewById(android.R.id.text1);
178             tv.setText(getGroup(groupPosition).toString());
179             tv.setTextColor(Color.RED);
180             tv.setTextSize(30);
181 
182             return convertView;
183 
184         }
185 
186         @Override
187         public Object getGroup(int groupPosition) {
188             HashMap<String, Object> items = date.get(groupPosition);
189             return items.get(GROUP) + "";
190         }
191 
192     }
193 
194 }

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     tools:context="com.lixu.qqfenzu.MainActivity" >
 6 
 7     <ExpandableListView
 8         android:id="@+id/elv"
 9         android:layout_width="match_parent"
10         android:layout_height="300dp" />
11 
12     <LinearLayout
13         android:id="@+id/linearLayout1"
14         android:layout_width="wrap_content"
15         android:layout_height="wrap_content"
16         android:layout_below="@id/elv" >
17 
18         <EditText
19             android:id="@+id/et"
20             android:layout_width="100dp"
21             android:layout_height="wrap_content" >
22 
23             <requestFocus />
24         </EditText>
25     </LinearLayout>
26 
27     <Button
28         android:id="@+id/btn1"
29         android:layout_width="wrap_content"
30         android:layout_height="wrap_content"
31         android:layout_alignParentRight="true"
32         android:layout_alignTop="@+id/linearLayout1"
33         android:text="添加内容" />
34 
35     <Button
36         android:id="@+id/btn"
37         android:layout_width="wrap_content"
38         android:layout_height="wrap_content"
39         android:layout_alignBaseline="@+id/btn1"
40         android:layout_alignBottom="@+id/btn1"
41         android:layout_toLeftOf="@+id/btn1"
42         android:text="添加组" />
43 
44 </RelativeLayout>