在android里用ExpandableListView实现二层和三层列表源码
二层列表是直接用androidAPI中的ExpandableListView即可实现,三层列表其实是对二层列表的一个嵌套,实现起来会相对繁琐。
部分代码:
SuperTreeViewAdapter.java
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; } }
ExpandableListViewActivity.java
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);
main.xml
<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>
效果图 :
三层列表
二层列表