在android里用ExpandableListView实现二层和三层列表源码

public

 class SuperTreeViewAdapter extends
 BaseExpandableListAdapter {      static
 public

 class SuperTreeNode {         Object parent;         
//二级树形菜单的结构体

        List<TreeViewAdapter.TreeNode> childs = new
 ArrayList<TreeViewAdapter.TreeNode>();     }      private
 List<SuperTreeNode> superTreeNodes = new

 ArrayList<SuperTreeNode>();     private
 Context parentContext;     private
 OnChildClickListener stvClickEvent;//外部回调函数

    
    public
 SuperTreeViewAdapter(Context view,OnChildClickListener stvClickEvent) {         parentContext = view;         
this

.stvClickEvent=stvClickEvent;     }      public
 List<SuperTreeNode> GetTreeNode() {         return


 superTreeNodes;     }      public void
 UpdateTreeNode(List<SuperTreeNode> node) {         superTreeNodes =
 node;     }          

public void


 RemoveAll()     {         superTreeNodes.clear();     }          public
 Object getChild(int

 groupPosition, int childPosition) {         
return superTreeNodes.get(groupPosition).childs.get(childPosition);     }      
public int
 getChildrenCount(

int groupPosition) {         return
 superTreeNodes.get(groupPosition).childs.size();     }      public
 ExpandableListView getExpandableListView() {         AbsListView.LayoutParams lp = 
new

 AbsListView.LayoutParams(                 ViewGroup.LayoutParams.FILL_PARENT, TreeViewAdapter.ItemHeight);         ExpandableListView superTreeView 
= new

 ExpandableListView(parentContext);         superTreeView.setLayoutParams(lp);         
return superTreeView;     }      /**
      * 三层树结构中的第二层是一个ExpandableListView      */
    
    public View getChildView(int
 groupPosition, int childPosition,             
boolean isLastChild, View convertView, ViewGroup parent) {         
//

 是 

        final ExpandableListView treeView = getExpandableListView();         
final TreeViewAdapter treeViewAdapter = new
 TreeViewAdapter(this.parentContext,0);         List
<TreeNode> tmp = treeViewAdapter.getTreeNode();//
临时变量取得TreeViewAdapter的TreeNode集合，可为空        final
 TreeNode treeNode=

(TreeNode) getChild(groupPosition, childPosition);         tmp.add(treeNode);         treeViewAdapter.updateTreeNode(tmp);         treeView.setAdapter(treeViewAdapter);                  
//

关键点：取得选中的二级树形菜单的父子节点,结果返回给外部回调函数

        treeView.setOnChildClickListener(this.stvClickEvent);                  
/**
          * 关键点：第二级菜单展开时通过取得节点数来设置第三级菜单的大小          */
         treeView.setOnGroupExpandListener(

new OnGroupExpandListener() {             @Override             
public void
 onGroupExpand(int
 groupPosition) {                                  AbsListView.LayoutParams lp 

= new
 AbsListView.LayoutParams(                         ViewGroup.LayoutParams.FILL_PARENT,                         (treeNode.childs.size()

+1)*TreeViewAdapter.ItemHeight + 10);                 treeView.setLayoutParams(lp);             }         });                  
/**

          * 第二级菜单回收时设置为标准Item大小          */
         treeView.setOnGroupCollapseListener(new
 OnGroupCollapseListener() {             @Override             public
 void onGroupCollapse(int


 groupPosition) {                                  AbsListView.LayoutParams lp = new
 AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,                         TreeViewAdapter.ItemHeight);                 treeView.setLayoutParams(lp);             }         });         treeView.setPadding(TreeViewAdapter.PaddingLeft
*2, 0, 0, 0);         return
 treeView;     }      

/**      * 三级树结构中的首层是TextView,用于作为title      
*/

    public View getGroupView(int
 groupPosition, boolean
 isExpanded,             View convertView, ViewGroup parent) {         TextView textView 

= TreeViewAdapter.getTextView(this
.parentContext);         textView.setText(getGroup(groupPosition).toString());         textView.setPadding(TreeViewAdapter.PaddingLeft*2, 0, 0, 0);         
return

 textView;     }      public
 long getChildId(int
 groupPosition, 

int childPosition) {         return
 childPosition;     }      public
 Object getGroup(int groupPosition) {         
return

 superTreeNodes.get(groupPosition).parent;     }      public
 int getGroupCount() {         


return superTreeNodes.size();     }      public
 long getGroupId(int


 groupPosition) {         return groupPosition;     }      
public boolean
 isChildSelectable(int groupPosition, int
 childPosition) {         

return true
;     }      public
 boolean

 hasStableIds() {         return
 true;     } }

List<SuperTreeViewAdapter.SuperTreeNode> superNodeTree = superAdapter.GetTreeNode（）；                 
for （int
 i = 0； i < parent.length； i++

） {                     SuperTreeViewAdapter.SuperTreeNode superNode = new
 SuperTreeViewAdapter.SuperTreeNode（）；                     superNode.parent = parent[i]；     
for

 （int j = 0； j < child_grandchild.length； j++
） {                          TreeViewAdapter.TreeNode node = new
 TreeViewAdapter.TreeNode（）；                          node.parent = child_grandchild[j][0][0]；                         
for

 （int k = 0； k < child_grandchild[j][1].length； k++
） {                           node.childs.add（child_grandchild[j][1][k]）；                         }                          　　superNode.childs.add（node）；              　　        }                 　　    superNodeTree.add（superNode）；         　　        }         　　superAdapter.UpdateTreeNode（superNodeTree）；                  expandableListView.setAdapter（superAdapter）；     

<LinearLayout         android:id="@+id/linearLayout1"
         android:layout_width="match_parent"         android:layout_height
="wrap_content"

         android:layout_gravity="center"         android:gravity
="center" >

        <Button             android:id="@+id/button1"
             android:layout_width="100dip"             android:layout_height
="wrap_content"

             android:text
="二层结构" />

        <Button             android:id="@+id/button2"
             android:layout_width="100dip"             android:layout_height
="wrap_content"

             android:text
="三层结构" />
    </LinearLayout>

    <ExpandableListView         android:id="@+id/expandablelistview"
         android:layout_width="fill_parent"         android:layout_height
="fill_parent"
        >
    </ExpandableListView>