Android開發教程：擴展的ListView實例

由於比較簡單，所有就直接上代碼：         

1. public class ExtendedListView extends ExpandableListActivity {  
2.   
3.     @Override  
4.     protected void onCreate(Bundle savedInstanceState) {  
5.         // TODO Auto-generated method stub  
6.         super.onCreate(savedInstanceState);  
7.           
8.         MyExpandableListAdapter adapter=new MyExpandableListAdapter();  
9.         setListAdapter(adapter);  
10.           
11.     }  
12.     public class MyExpandableListAdapter extends BaseExpandableListAdapter{  
13.         public String[] groups={"我的好友","大學同學","高中同學"};  
14.         public String[][] childrens={{"小張","小李","小麗","向明"},{"向明","向明","向明","向明"},{"向明","向明","向明","向明"}};  
15.         public Object getChild(int groupPosition, int childPosition) {  
16.             // TODO Auto-generated method stub  
17.             return childrens[groupPosition][childPosition];  
18.         }  
19.   
20.         public long getChildId(int groupPosition, int childPosition) {  
21.             // TODO Auto-generated method stub  
22.             return childPosition;  
23.         }  
24.   
25.         public View getChildView(int groupPosition, int childPosition,  
26.                 boolean isLastChild, View convertView, ViewGroup parent) {  
27.             // TODO Auto-generated method stub  
28.             TextView textView=getGenericView();  
29.             textView.setText(getChild(groupPosition, childPosition).toString());  
30.             return textView;  
31.         }  
32.         //新建一個TextView  
33.          public TextView getGenericView() {  
34.                 // Layout parameters for the ExpandableListView  
35.                 AbsListView.LayoutParams lp = new AbsListView.LayoutParams(  
36.                         ViewGroup.LayoutParams.MATCH_PARENT, 64);  
37.   
38.                 TextView textView = new TextView(ExtendedListView.this);  
39.                 textView.setLayoutParams(lp);  
40.                 // Center the text vertically  
41.                 textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);  
42.                 // Set the text starting position  
43.                 textView.setPadding(36, 0, 0, 0);  
44.                 return textView;  
45.             }  
46.               
47.         public int getChildrenCount(int groupPosition) {  
48.             // TODO Auto-generated method stub  
49.             return childrens[groupPosition].length;  
50.         }  
51.   
52.         public Object getGroup(int groupPosition) {  
53.             // TODO Auto-generated method stub  
54.             return groups[groupPosition];  
55.         }  
56.   
57.         public int getGroupCount() {  
58.             // TODO Auto-generated method stub  
59.             return groups.length;  
60.         }  
61.   
62.         public long getGroupId(int groupPosition) {  
63.             // TODO Auto-generated method stub  
64.             return groupPosition;  
65.         }  
66.   
67.         public View getGroupView(int groupPosition, boolean isExpanded,  
68.                 View convertView, ViewGroup parent) {  
69.             // TODO Auto-generated method stub  
70.             TextView textView = getGenericView();  
71.             textView.setText(getGroup(groupPosition).toString());  
72.             return textView;  
73.         }  
74.   
75.         public boolean hasStableIds() {  
76.             // TODO Auto-generated method stub  
77.             return true;  
78.         }  
79.   
80.         public boolean isChildSelectable(int groupPosition, int childPosition) {  
81.             // TODO Auto-generated method stub  
82.             return true;  
83.         }  
84.           
85.     }  
86. }