Android中ExpandableListView控件的使用

本文采用一个Demo来展示Android中ExpandableListView控件的使用，如如何在组/子ListView中绑定数据源。直接上代码如下：

程序结构图：

layout目录下的 main.xml 文件源码如下：

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1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:orientation="vertical"  
4.     android:layout_width="fill_parent"  
5.     android:layout_height="fill_parent">  
6.     <!-- 我们会自己定义listview的显示方式（在另外一个布局文件里边）不用默认的方式   
7.          如果自定义listview的显示方式这里这个android:id="@id/android:list" 必须这样写 -->  
8.     <!-- android:drawSelectOnTop="false"此属性用来设置listview上的背景颜色会不会  
9.      挡住（覆盖）内容 , 如果这是为false就表示不会覆盖掉 -->   
10.     <ExpandableListView   
11.         android:id="@id/android:list"                 
12.         android:layout_width="fill_parent"                  
13.         android:layout_height="wrap_content"                
14.         android:layout_weight="1"                 
15.         android:drawSelectorOnTop="false"/>   
16. </LinearLayout>  

包 com.andyidea.demo中ContactsActivity.java源码如下：

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1. package com.andyidea.demo;  
2.   
3. import java.util.ArrayList;  
4. import java.util.List;  
5.   
6. import android.app.ExpandableListActivity;  
7. import android.os.Bundle;  
8. import android.view.Gravity;  
9. import android.view.View;  
10. import android.view.ViewGroup;  
11. import android.view.Window;  
12. import android.widget.AbsListView;  
13. import android.widget.BaseExpandableListAdapter;  
14. import android.widget.TextView;  
15.   
16. public class ContactsActivity extends ExpandableListActivity {  
17.       
18.     List<String> group;           //组列表  
19.     List<List<String>> child;     //子列表  
20.     ContactsInfoAdapter adapter;  //数据适配器  
21.       
22.     /** Called when the activity is first created. */  
23.     @Override  
24.     public void onCreate(Bundle savedInstanceState) {  
25.         super.onCreate(savedInstanceState);  
26.         requestWindowFeature(Window.FEATURE_NO_TITLE);  //设置为无标题  
27.         setContentView(R.layout.main);  
28.         getExpandableListView().setBackgroundResource(R.drawable.default_bg);  
29.           
30.         initializeData();  
31.         getExpandableListView().setAdapter(new ContactsInfoAdapter());  
32.         getExpandableListView().setCacheColorHint(0);  //设置拖动列表的时候防止出现黑色背景  
33.     }  
34.       
35.     /**  
36.      * 初始化组、子列表数据  
37.      */  
38.     private void initializeData(){  
39.         group = new ArrayList<String>();  
40.         child = new ArrayList<List<String>>();  
41.           
42.         addInfo("Andy",new String[]{"male","138123***","GuangZhou"});  
43.         addInfo("Fairy",new String[]{"female","138123***","GuangZhou"});  
44.         addInfo("Jerry",new String[]{"male","138123***","ShenZhen"});  
45.         addInfo("Tom",new String[]{"female","138123***","ShangHai"});  
46.         addInfo("Bill",new String[]{"male","138231***","ZhanJiang"});  
47.           
48.     }  
49.       
50.     /**  
51.      * 模拟给组、子列表添加数据  
52.      * @param g-group  
53.      * @param c-child  
54.      */  
55.     private void addInfo(String g,String[] c){  
56.         group.add(g);  
57.         List<String> childitem = new ArrayList<String>();  
58.         for(int i=0;i<c.length;i++){  
59.             childitem.add(c[i]);  
60.         }  
61.         child.add(childitem);  
62.     }  
63.       
64.     class ContactsInfoAdapter extends BaseExpandableListAdapter{  
65.   
66.           
67.         //-----------------Child----------------//  
68.         @Override  
69.         public Object getChild(int groupPosition, int childPosition) {  
70.             return child.get(groupPosition).get(childPosition);  
71.         }  
72.           
73.         @Override  
74.         public long getChildId(int groupPosition, int childPosition) {  
75.             return childPosition;  
76.         }  
77.           
78.         @Override  
79.         public int getChildrenCount(int groupPosition) {  
80.             return child.get(groupPosition).size();  
81.         }  
82.           
83.         @Override  
84.         public View getChildView(int groupPosition, int childPosition,  
85.                 boolean isLastChild, View convertView, ViewGroup parent) {  
86.             String string = child.get(groupPosition).get(childPosition);   
87.             return getGenericView(string);  
88.         }  
89.           
90.         //----------------Group----------------//  
91.         @Override  
92.         public Object getGroup(int groupPosition) {  
93.             return group.get(groupPosition);  
94.         }                 
95.   
96.         @Override  
97.         public long getGroupId(int groupPosition) {  
98.             return groupPosition;  
99.         }     
100.           
101.         @Override  
102.         public int getGroupCount() {  
103.             return group.size();  
104.         }     
105.           
106.         @Override  
107.         public View getGroupView(int groupPosition, boolean isExpanded,  
108.                 View convertView, ViewGroup parent) {  
109.             String string = group.get(groupPosition);    
110.             return getGenericView(string);  
111.         }  
112.   
113.         //创建组/子视图    
114.         public TextView getGenericView(String s) {    
115.             // Layout parameters for the ExpandableListView    
116.             AbsListView.LayoutParams lp = new AbsListView.LayoutParams(    
117.                     ViewGroup.LayoutParams.FILL_PARENT, 40);  
118.     
119.             TextView text = new TextView(ContactsActivity.this);    
120.             text.setLayoutParams(lp);    
121.             // Center the text vertically    
122.             text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);    
123.             // Set the text starting position    
124.             text.setPadding(36, 0, 0, 0);    
125.                 
126.             text.setText(s);    
127.             return text;    
128.         }    
129.           
130.           
131.         @Override  
132.         public boolean hasStableIds() {  
133.             // TODO Auto-generated method stub  
134.             return false;  
135.         }         
136.   
137.         @Override  
138.         public boolean isChildSelectable(int groupPosition, int childPosition) {  
139.             // TODO Auto-generated method stub  
140.             return true;  
141.         }  
142.           
143.     }  
144. }  

最后，程序运行后截图如下：