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Android中ExpandableListView控件的施用

热度：51   发布时间：2016-05-01 11:47:56.0
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：

[html]?view plaincopy
  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：

[html]?view plaincopy
  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. [email protected]
  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. [email protected]
  53. [email protected]
  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. [email protected]
  69. ????????public?Object?getChild(int?groupPosition,?int?childPosition)?{??
  70. ????????????return?child.get(groupPosition).get(childPosition);??
  71. ????????}??
  72. ??????????
  73. [email protected]
  74. ????????public?long?getChildId(int?groupPosition,?int?childPosition)?{??
  75. ????????????return?childPosition;??
  76. ????????}??
  77. ??????????
  78. [email protected]
  79. ????????public?int?getChildrenCount(int?groupPosition)?{??
  80. ????????????return?child.get(groupPosition).size();??
  81. ????????}??
  82. ??????????
  83. [email protected]
  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. [email protected]
  92. ????????public?Object?getGroup(int?groupPosition)?{??
  93. ????????????return?group.get(groupPosition);??
  94. ????????}?????????????????
  95. ??
  96. [email protected]
  97. ????????public?long?getGroupId(int?groupPosition)?{??
  98. ????????????return?groupPosition;??
  99. ????????}?????
  100. ??????????
  101. [email protected]
  102. ????????public?int?getGroupCount()?{??
  103. ????????????return?group.size();??
  104. ????????}?????
  105. ??????????
  106. [email protected]
  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. [email protected]
  132. ????????public?boolean?hasStableIds()?{??
  133. ????????????//?TODO?Auto-generated?method?stub??
  134. ????????????return?false;??
  135. ????????}?????????
  136. ??
  137. [email protected]
  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：

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