android学习笔记22：可展开的ListView

http://blog.csdn.net/hn307165411/article/details/7173284

有时在写程序时，我们希望一个listview能展开其下的子类目，在android中可以通过使用ExpandAbleListView来实现，只需要在代码里为ExpandAbleListView设置一个ExpandAbleLIstAdapter的数据源即可。

[html] view plaincopyprint?

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.     >  
7. <ExpandableListView   
8.     android:id="@+id/list"   
9.     android:layout_width="fill_parent"   
10.     android:layout_height="wrap_content"   
11.     android:childIndicator="@drawable/icon"   
12.     ></ExpandableListView>  
13. </LinearLayout>  

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1. public class ExpandableListViewTest extends Activity  
2. {  
3.     @Override  
4.     public void onCreate(Bundle savedInstanceState)  
5.     {  
6.         super.onCreate(savedInstanceState);  
7.         setContentView(R.layout.main);  
8.         //创建一个BaseExpandableListAdapter对象  
9.         ExpandableListAdapter adapter = new BaseExpandableListAdapter()  
10.         {  
11.             int[] logos = new int[]  
12.             {  
13.                 R.drawable.sunyz_1,   
14.                 R.drawable.sunyz_6,  
15.                 R.drawable.sunyz_7  
16.             };  
17.             private String[] CDs = new String[]  
18.                 { "风筝", "完美的一天", "是时候"};  
19.             private String[][] songs = new String[][]  
20.             {   
21.                 { "绿光", "不是真的爱我", "爱情字典", "练习" },  
22.                 { "Honey Honey", "心愿", "明天晴天", "隐形人" },  
23.                 { "愚人的国度", "是时候" , "世说心语" }  
24.             };  
25.             //获取指定组位置、指定子列表项处的子列表项数据  
26.             @Override  
27.             public Object getChild(int groupPosition, int childPosition)  
28.             {  
29.                 return songs[groupPosition][childPosition];  
30.             }  
31.             @Override  
32.             public long getChildId(int groupPosition, int childPosition)  
33.             {  
34.                 return childPosition;  
35.             }  
36.             @Override  
37.             public int getChildrenCount(int groupPosition)  
38.             {  
39.                 return songs[groupPosition].length;  
40.             }  
41.             private TextView getTextView()  
42.             {  
43.                 //用于实现条目的虚拟列表的基类. 这里的列表没有空间的定义。 例如，该类的子类可以以网格的形式、走马灯的形式显示，或者作为堆栈等等  
44.                 AbsListView.LayoutParams lp = new AbsListView.LayoutParams(  
45.                         ViewGroup.LayoutParams.FILL_PARENT, 64);  //设置宽和高   
46.                 TextView textView = new TextView(ExpandableListViewTest.this);  
47.                 textView.setLayoutParams(lp);  
48.                 textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);  
49.                 textView.setPadding(36, 0, 0, 0);  
50.                 textView.setTextSize(20);  
51.                 return textView;  
52.             }  
53.             //该方法决定每个子选项的外观  
54.             @Override  
55.             public View getChildView(int groupPosition, int childPosition,  
56.                     boolean isLastChild, View convertView, ViewGroup parent)  
57.             {  
58.                 TextView textView = getTextView();            
59.                 textView.setText(getChild(groupPosition, childPosition).toString());  
60.                 return textView;  
61.             }  
62.             //获取指定组位置处的组数据  
63.             @Override  
64.             public Object getGroup(int groupPosition)  
65.             {  
66.                 return CDs[groupPosition];  
67.             }  
68.             @Override  
69.             public int getGroupCount()  
70.             {  
71.                 return CDs.length;  
72.             }  
73.             @Override  
74.             public long getGroupId(int groupPosition)  
75.             {  
76.                 return groupPosition;  
77.             }  
78.             //该方法决定每个组选项的外观  
79.             @Override  
80.             public View getGroupView(int groupPosition, boolean isExpanded,  
81.                     View convertView, ViewGroup parent)  
82.             {  
83.                 LinearLayout ll = new LinearLayout(ExpandableListViewTest.this);  
84.                 ll.setOrientation(0);  
85.                 ImageView logo = new ImageView(ExpandableListViewTest.this);  
86.                 logo.setImageResource(logos[groupPosition]);  
87.                 ll.addView(logo);  
88.                 TextView textView = getTextView();  
89.                 textView.setText(getGroup(groupPosition).toString());                 
90.                 ll.addView(textView);             
91.                 return ll;  
92.             }  
93.             @Override  
94.             public boolean isChildSelectable(int groupPosition, int childPosition)  
95.             {  
96.                 return true;  
97.             }  
98.             @Override  
99.             public boolean hasStableIds()  
100.             {  
101.                 return true;  
102.             }  
103.         };  
104.         ExpandableListView expandListView = (ExpandableListView)  
105.             findViewById(R.id.list);  
106.         expandListView.setAdapter(adapter);  
107.     }  
108. }