Qq friend group for Android (expandablelistview ).

In project development, we may have encountered nested listview in listview, but Google suggests that we do not do this, so they have written an expandablelistview class, which inherits listview, you can implement the nested listview effect in the listview. Well, let's not talk about it. First:

 

Main Code:

 

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1. Public class exlistview extends activity {
2. Private Static final string group_text = "group_text"; // key of map members
3. Private Static final string child_text1 = "child_text1"; // the first key of the group member Map
4. Private Static final string child_text2 = "child_text2"; // The second key of the group member Map
6. List <Map <string, string> groupdata = new arraylist <Map <string, string> (); // large group members
7. List <list <Map <string, string >>> childdata = new arraylist <list <Map <string, string >>>(); // group member
9. Exadapter adapter;
10. Expandablelistview exlist; // scalable listview
12. @ Override
13. Public void oncreate (bundle savedinstancestate ){
14. Super. oncreate (savedinstancestate );
15. Setcontentview (R. layout. Main );
16. // Add data to a large group
17. For (INT I = 1; I <6; I ++ ){
18. Map <string, string> curgroupmap = new hashmap <string, string> ();
19. Groupdata. Add (curgroupmap );
20. Curgroupmap. Put (group_text, "" + I + "");
22. List <Map <string, string> Children = new arraylist <Map <string, string> ();
23. For (Int J = 1; j <6; j ++ ){
24. Map <string, string> curchildmap = new hashmap <string, string> ();
25. Children. Add (curchildmap );
26. Curchildmap. Put (child_text1, "th" + J + "group ");
27. Curchildmap. Put (child_text2, "th" + J + "Group Signature ");
28. }
29. Childdata. Add (children );
30. }
32. Adapter = new exadapter (exlistview. This );
33. Exlist = (expandablelistview) findviewbyid (R. Id. List );
34. Exlist. setadapter (adapter );
35. Exlist. setgroupindicator (null); // do not set the big group indicator icon, because we have set
36. Exlist. setdivider (null); // you can specify the image that can be stretched.
37. }
38. // The key code is this extensible listview adapter.
39. Class exadapter extends baseexpandablelistadapter {
40. Context context;
42. Public exadapter (context ){
43. Super ();
44. This. Context = context;
45. }
46. // Obtain the view of the group members
47. Public View getgroupview (INT groupposition, Boolean isexpanded,
48. View convertview, viewgroup parent ){
49. View view = convertview;
50. If (view = NULL ){
51. Layoutinflater Inflater = (layoutinflater) getsystemservice (context. layout_inflater_service );
52. View = Inflater. Inflate (R. layout. member_listview, null );
53. }
55. Textview Title = (textview) view. findviewbyid (R. Id. content_001 );
56. Title. settext (getgroup (groupposition). tostring (); // you can specify a group name.
58. Imageview image = (imageview) view. findviewbyid (R. Id. tubiao); // whether to expand the arrow icon of a large group
59. If (isexpanded) // when a large group is expanded
60. Image. setbackgroundresource (R. drawable. btn_browser2 );
61. Else // when merging large groups
62. Image. setbackgroundresource (R. drawable. btn_browser );
64. Return view;
65. }
66. // Obtain the group ID.
67. Public long getgroupid (INT groupposition ){
68. Return groupposition;
69. }
70. // Obtain the group name
71. Public object getgroup (INT groupposition ){
72. Return groupdata. Get (groupposition). Get (group_text). tostring ();
73. }
74. // Obtain the total number of group members
75. Public int getgroupcount (){
76. Return groupdata. Size ();
78. }
80. // Get the view of the group member
81. Public View getchildview (INT groupposition, int childposition,
82. Boolean islastchild, view convertview, viewgroup parent ){
83. View view = convertview;
84. If (view = NULL ){
85. Layoutinflater Inflater = layoutinflater. From (context );
86. View = Inflater. Inflate (R. layout. member_childitem, null );
87. }
88. Final textview Title = (textview) view
89. . Findviewbyid (R. Id. child_text );
90. Title. settext (childdata. Get (groupposition). Get (childposition)
91. . Get (child_text1). tostring (); // large title
92. Final textview title2 = (textview) view
93. . Findviewbyid (R. Id. child_text2 );
94. Title2.settext (childdata. Get (groupposition). Get (childposition)
95. . Get (child_text2). tostring (); // subtitle
97. Return view;
98. }
99. // Obtain the group member ID
100. Public long getchildid (INT groupposition, int childposition ){
101. Return childposition;
102. }
103. // Obtain the group member name
104. Public object getchild (INT groupposition, int childposition ){
105. Return childdata. Get (groupposition). Get (childposition). Get (child_text1)
106. . Tostring ();
107. }
108. // Obtain the number of group members
109. Public int getchildrencount (INT groupposition ){
110. Return childdata. Get (groupposition). Size ();
111. }
112. /**
113. * Indicates whether the child and group IDs are stable when SS changes to
114. * Underlying data.
115. * Indicates whether the underlying data is stably changed by the big group and group ID.
116. * @ Return whether or not the same ID always refers to the same object
117. * @ See adapter # hasstableids ()
118. */
119. Public Boolean hasstableids (){
120. Return true;
121. }
122. // Obtain whether the group member is selected
123. Public Boolean ischildselectable (INT groupposition, int childposition ){
124. Return true;
125. }
127. }
128. }