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 {
3. @Override
4. protected void onCreate(Bundle savedInstanceState) {
5. // TODO Auto-generated method stub
6. super.onCreate(savedInstanceState);
8. MyExpandableListAdapter adapter=new MyExpandableListAdapter();
9. setListAdapter(adapter);
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. }
20. public long getChildId(int groupPosition, int childPosition) {
21. // TODO Auto-generated method stub
22. return childPosition;
23. }
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);
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. }
47. public int getChildrenCount(int groupPosition) {
48. // TODO Auto-generated method stub
49. return childrens[groupPosition].length;
50. }
52. public Object getGroup(int groupPosition) {
53. // TODO Auto-generated method stub
54. return groups[groupPosition];
55. }
57. public int getGroupCount() {
58. // TODO Auto-generated method stub
59. return groups.length;
60. }
62. public long getGroupId(int groupPosition) {
63. // TODO Auto-generated method stub
64. return groupPosition;
65. }
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. }
75. public boolean hasStableIds() {
76. // TODO Auto-generated method stub
77. return true;
78. }
80. public boolean isChildSelectable(int groupPosition, int childPosition) {
81. // TODO Auto-generated method stub
82. return true;
83. }
85. }
86. }