本文转自：http://lovezhou.iteye.com/blog/848744

ExpandableList 是折叠列表，通过继承ExpandableListActivity 类就可以非常简单的实现折叠列表。
效果图：


代码实现
Java代码
  1. packagecom.zhou.activity;
  3. importandroid.app.ExpandableListActivity;
  4. importandroid.os.Bundle;
  5. importandroid.view.ContextMenu;
  6. importandroid.view.Gravity;
  7. importandroid.view.MenuItem;
  8. importandroid.view.View;
  9. importandroid.view.ViewGroup;
  10. importandroid.view.ContextMenu.ContextMenuInfo;
  11. importandroid.widget.AbsListView;
  12. importandroid.widget.BaseExpandableListAdapter;
  13. importandroid.widget.ExpandableListAdapter;
  14. importandroid.widget.ExpandableListView;
  15. importandroid.widget.TextView;
  16. importandroid.widget.Toast;
  17. importandroid.widget.ExpandableListView.ExpandableListContextMenuInfo;
  19. publicclassExpandableListextendsExpandableListActivity{
  20. //声明adapter
  21. privateExpandableListAdaptermAdapter;
  22. @Override
  23. protectedvoidonCreate(BundlesavedInstanceState){
  24. super.onCreate(savedInstanceState);
  25. //设这标题
  26. setTitle("可扩展的列表");
  27. //实例化adapter
  28. mAdapter=newMyExpandableListAdapter();
  29. //为列表设置adapter
  30. setListAdapter(mAdapter);
  31. //为list注册context菜单
  32. registerForContextMenu(this.getExpandableListView());
  33. }
  36. @Override
  37. publicbooleanonChildClick(ExpandableListViewparent,Viewv,
  38. intgroupPosition,intchildPosition,longid){
  39. Toast.makeText(this,"组元素索引:"+groupPosition+"子元素索引:"+childPosition,Toast.LENGTH_SHORT).show();
  40. returnsuper.onChildClick(parent,v,groupPosition,childPosition,id);
  41. }
  44. @Override
  45. publicvoidonGroupExpand(intgroupPosition){
  46. Toast.makeText(this,"组元素索引:"+groupPosition,Toast.LENGTH_SHORT).show();
  47. super.onGroupExpand(groupPosition);
  48. }
  50. @Override
  51. publicvoidonCreateContextMenu(ContextMenumenu,Viewv,
  52. ContextMenuInfomenuInfo){
  53. menu.setHeaderTitle("上下文菜单");
  54. menu.add(0,0,0,"单击我");
  55. }
  57. //单击上下文菜单后的逻辑
  58. @Override
  59. publicbooleanonContextItemSelected(MenuItemitem){
  60. ExpandableListContextMenuInfoinfo=(ExpandableListContextMenuInfo)item.getMenuInfo();
  61. Stringtitle=((TextView)info.targetView).getText().toString();
  63. inttype=ExpandableListView.getPackedPositionType(info.packedPosition);
  64. if(type==ExpandableListView.PACKED_POSITION_TYPE_CHILD){
  65. intgroupPos=ExpandableListView.getPackedPositionGroup(info.packedPosition);
  66. intchildPos=ExpandableListView.getPackedPositionChild(info.packedPosition);
  67. Toast.makeText(this,title+"组元素索引:"+groupPos+"子元素索引:"+childPos,Toast.LENGTH_SHORT).show();
  68. returntrue;
  69. }elseif(type==ExpandableListView.PACKED_POSITION_TYPE_GROUP){
  70. intgroupPos=ExpandableListView.getPackedPositionGroup(info.packedPosition);
  71. Toast.makeText(this,title+"组元素索引:"+groupPos,Toast.LENGTH_SHORT).show();
  72. returntrue;
  73. }
  74. returnfalse;
  75. }
  76. //自定义Adapter
  77. publicclassMyExpandableListAdapterextendsBaseExpandableListAdapter{
  78. //父列表数据
  79. privateString[]groups=
  80. {
  81. "吉林省",
  82. "辽宁省",
  83. "黑龙江省",
  84. "山东省"
  85. };
  86. //子列表数据
  87. privateString[][]children=
  88. {
  89. {"长春市"},
  90. {"沈阳市","铁岭市"},
  91. {"哈尔滨市","齐齐哈尔市","牡丹江市"},
  92. {"济南市","青岛市","淄博市","潍坊市"}
  93. };
  94. @Override
  95. publicObjectgetChild(intgroupPosition,intchildPosition){
  96. returnchildren[groupPosition][childPosition];
  97. }
  98. @Override
  99. publiclonggetChildId(intgroupPosition,intchildPosition){
  100. returnchildPosition;
  101. }
  102. @Override
  103. publicintgetChildrenCount(intgroupPosition){
  104. returnchildren[groupPosition].length;
  105. }
  106. //取子列表中的某一项的View
  107. @Override
  108. publicViewgetChildView(intgroupPosition,intchildPosition,
  109. booleanisLastChild,ViewconvertView,ViewGroupparent){
  110. TextViewtextView=getGenericView();
  111. textView.setText(getChild(groupPosition,childPosition).toString());
  112. returntextView;
  113. }
  114. @Override
  115. publicObjectgetGroup(intgroupPosition){
  116. returngroups[groupPosition];
  117. }
  118. @Override
  119. publicintgetGroupCount(){
  120. returngroups.length;
  121. }
  122. @Override
  123. publiclonggetGroupId(intgroupPosition){
  124. returngroupPosition;
  125. }
  126. //取父列表中的某一项的View
  127. @Override
  128. publicViewgetGroupView(intgroupPosition,booleanisExpanded,
  129. ViewconvertView,ViewGroupparent){
  130. TextViewtextView=getGenericView();
  131. textView.setText(getGroup(groupPosition).toString());
  132. returntextView;
  133. }
  134. @Override
  135. publicbooleanhasStableIds(){
  136. returntrue;
  137. }
  138. @Override
  139. publicbooleanisChildSelectable(intgroupPosition,intchildPosition){
  140. returntrue;
  141. }
  142. //获取某一项的View的逻辑
  143. privateTextViewgetGenericView(){
  144. AbsListView.LayoutParamslp=newAbsListView.LayoutParams(
  145. ViewGroup.LayoutParams.FILL_PARENT,48);
  146. TextViewtextView=newTextView(ExpandableList.this);
  147. textView.setLayoutParams(lp);
  148. textView.setGravity(Gravity.CENTER_VERTICAL|Gravity.LEFT);
  149. textView.setPadding(32,0,0,0);
  150. returntextView;
  151. }
  152. }
  153. }
package com.zhou.activity;import android.app.ExpandableListActivity;import android.os.Bundle;import android.view.ContextMenu;import android.view.Gravity;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.view.ContextMenu.ContextMenuInfo;import android.widget.AbsListView;import android.widget.BaseExpandableListAdapter;import android.widget.ExpandableListAdapter;import android.widget.ExpandableListView;import android.widget.TextView;import android.widget.Toast;import android.widget.ExpandableListView.ExpandableListContextMenuInfo;public class ExpandableList extends ExpandableListActivity {//声明adapterprivate ExpandableListAdapter mAdapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//设这标题setTitle("可扩展的列表");//实例化adaptermAdapter = new MyExpandableListAdapter();//为列表设置adaptersetListAdapter(mAdapter);//为list注册context菜单registerForContextMenu(this.getExpandableListView());}@Overridepublic boolean onChildClick(ExpandableListView parent, View v,int groupPosition, int childPosition, long id) {Toast.makeText(this, " 组元素索引: " + groupPosition + " 子元素索引: " + childPosition, Toast.LENGTH_SHORT).show();return super.onChildClick(parent, v, groupPosition, childPosition, id);}@Overridepublic void onGroupExpand(int groupPosition) {Toast.makeText(this, " 组元素索引: " + groupPosition, Toast.LENGTH_SHORT).show();super.onGroupExpand(groupPosition);}@Overridepublic void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) {menu.setHeaderTitle("上下文菜单");menu.add(0, 0, 0, "单击我");}// 单击上下文菜单后的逻辑@Overridepublic boolean onContextItemSelected(MenuItem item) {ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo();String title = ((TextView) info.targetView).getText().toString();int type = ExpandableListView.getPackedPositionType(info.packedPosition);if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition);Toast.makeText(this, title + " 组元素索引: " + groupPos + " 子元素索引: " + childPos, Toast.LENGTH_SHORT).show();return true;} else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);Toast.makeText(this, title + " 组元素索引: " + groupPos, Toast.LENGTH_SHORT).show();return true;}return false;}//自定义Adapterpublic class MyExpandableListAdapter extends BaseExpandableListAdapter {// 父列表数据private String[] groups = { "吉林省", "辽宁省", "黑龙江省","山东省" };// 子列表数据private String[][] children = {{ "长春市" },{ "沈阳市", "铁岭市" },{ "哈尔滨市", "齐齐哈尔市", "牡丹江市" },{ "济南市", "青岛市", "淄博市", "潍坊市" }};@Overridepublic Object getChild(int groupPosition, int childPosition) {return children[groupPosition][childPosition];}@Overridepublic long getChildId(int groupPosition, int childPosition) {return childPosition;}@Overridepublic int getChildrenCount(int groupPosition) {return children[groupPosition].length;}// 取子列表中的某一项的 View@Overridepublic View getChildView(int groupPosition, int childPosition,boolean isLastChild, View convertView, ViewGroup parent) {TextView textView = getGenericView();textView.setText(getChild(groupPosition, childPosition).toString());return textView;}@Overridepublic Object getGroup(int groupPosition) {return groups[groupPosition];}@Overridepublic int getGroupCount() {return groups.length;}@Overridepublic long getGroupId(int groupPosition) {return groupPosition;}// 取父列表中的某一项的 View@Overridepublic View getGroupView(int groupPosition, boolean isExpanded,View convertView, ViewGroup parent) {TextView textView = getGenericView();textView.setText(getGroup(groupPosition).toString());return textView;}@Overridepublic boolean hasStableIds() {return true;}@Overridepublic boolean isChildSelectable(int groupPosition, int childPosition) {return true;}// 获取某一项的 View 的逻辑private TextView getGenericView() {AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, 48);TextView textView = new TextView(ExpandableList.this);textView.setLayoutParams(lp);textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);textView.setPadding(32, 0, 0, 0);return textView;}}}
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  • ExpandableList.rar (44.9 KB)
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