android 二级菜单实现

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.hls.json.ButtonActivity"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:id="@+id/LinearLayout01"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:layout_height="wrap_content"
android:text="两层结构"
android:layout_width="160dip"
android:id="@+id/btnNormal">
</Button>
<Button
android:layout_height="wrap_content"
android:text="三层结构"
android:layout_width="160dip"
android:id="@+id/btnSuper"></Button>
</LinearLayout>
<ExpandableListView android:id="@+id/ExpandableListView01"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
</ExpandableListView>
</LinearLayout>

package com.example.hls.json;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ExpandableListView;
import android.widget.Toast;

import java.util.List;

public class ButtonActivity extends Activity {

/** Called when the activity is first created. */
ExpandableListView expandableList;
TreeViewAdapter adapter;
SuperTreeViewAdapter superAdapter;
Button btnNormal,btnSuper;
// Sample data set. children[i] contains the children (String[]) for groups[i].
public String[] groups = { "xxxx好友", "xxxx同学", "xxxxx女人"};
public String[][] child= {
{ "A君", "B君", "C君", "D君" },
{ "同学甲", "同学乙", "同学丙"},
{ "御姐", "萝莉" }
};

public String[] parent = { "xxxx好友", "xxxx同学"};
public String[][][] child_grandson= {
{{"A君"},
{"AA","AAA"}},
{{"B君"},
{"BBB","BBBB","BBBBB"}},
{{"C君"},
{"CCC","CCCC"}},
{{"D君"},
{"DDD","DDDD","DDDDD"}},
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_button);
//        this.setTitle("ExpandableListView练习----hellogv");
btnNormal=(Button)this.findViewById(R.id.btnNormal);
btnNormal.setOnClickListener(new ClickEvent());
btnSuper=(Button)this.findViewById(R.id.btnSuper);
btnSuper.setOnClickListener(new ClickEvent());
adapter=new TreeViewAdapter(this,TreeViewAdapter.PaddingLeft>>1);
superAdapter=new SuperTreeViewAdapter(this,stvClickEvent);
expandableList=(ExpandableListView) ButtonActivity.this.findViewById(R.id.ExpandableListView01);
}

class ClickEvent implements View.OnClickListener{

@Override
public void onClick(View v) {
adapter.RemoveAll();
adapter.notifyDataSetChanged();
superAdapter.RemoveAll();
superAdapter.notifyDataSetChanged();

if(v==btnNormal)
{
List<TreeViewAdapter.TreeNode> treeNode = adapter.GetTreeNode();
for(int i=0;i<groups.length;i++)
{
TreeViewAdapter.TreeNode node=new TreeViewAdapter.TreeNode();
node.parent=groups[i];
for(int ii=0;ii<child[i].length;ii++)
{
node.childs.add(child[i][ii]);
}
treeNode.add(node);
}

adapter.UpdateTreeNode(treeNode);
expandableList.setAdapter(adapter);
expandableList.setOnChildClickListener(new ExpandableListView.OnChildClickListener(){

@Override
public boolean onChildClick(ExpandableListView arg0, View arg1,
int parent, int children, long arg4) {

String str="parent id:"+String.valueOf(parent)+",children id:"+String.valueOf(children);
Toast.makeText(ButtonActivity.this, str, Toast.LENGTH_SHORT).show(
10eb1
);
return false;
}
});
}
else if(v==btnSuper){
List<SuperTreeViewAdapter.SuperTreeNode> superTreeNode = superAdapter.GetTreeNode();
for(int i=0;i<parent.length;i++)//第一层
{
SuperTreeViewAdapter.SuperTreeNode superNode=new SuperTreeViewAdapter.SuperTreeNode();
superNode.parent=parent[i];

//第二层
for(int ii=0;ii<child_grandson.length;ii++)
{
TreeViewAdapter.TreeNode node=new TreeViewAdapter.TreeNode();
node.parent=child_grandson[ii][0][0];//第二级菜单的标题

for(int iii=0;iii<child_grandson[ii][1].length;iii++)//第三级菜单
{
node.childs.add(child_grandson[ii][1][iii]);
}
superNode.childs.add(node);
}
superTreeNode.add(superNode);

}
superAdapter.UpdateTreeNode(superTreeNode);
expandableList.setAdapter(superAdapter);
}
}
}

/** 三级树形菜单的事件不再可用，本函数由三级树形菜单的子项（二级菜单）进行回调 */
ExpandableListView.OnChildClickListener stvClickEvent=new ExpandableListView.OnChildClickListener(){

@Override
public boolean onChildClick(ExpandableListView parent,
View v, int groupPosition, int childPosition,
long id) {
String str="parent id:"+String.valueOf(groupPosition)+",children id:"+String.valueOf(childPosition);
Toast.makeText(ButtonActivity.this, str, Toast.LENGTH_SHORT).show();

return false;
}

};
}

package com.example.hls.json;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

/**
* Created by HLS on 2016/9/26.
*/
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 ExpandableListView.OnChildClickListener stvClickEvent;//外部回调函数

public SuperTreeViewAdapter(Context view,ExpandableListView.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<TreeViewAdapter.TreeNode> tmp = treeViewAdapter.GetTreeNode();//临时变量取得TreeViewAdapter的TreeNode集合，可为空
final TreeViewAdapter.TreeNode treeNode=(TreeViewAdapter.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 ExpandableListView.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 ExpandableListView.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, 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, 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;
}
}

package com.example.hls.json;

import android.content.Context;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

/**
* Created by HLS on 2016/9/26.
*/
public class TreeViewAdapter extends BaseExpandableListAdapter{
public static final int ItemHeight = 48;//每项的高度
public static final int PaddingLeft = 36;//每项的高度
private int myPaddingLeft = 0;//如果是由SuperTreeView调用，则作为子项需要往右移

static public class TreeNode {
Object parent;
List<Object> childs = new ArrayList<Object>();
}

List<TreeNode> treeNodes = new ArrayList<TreeNode>();
Context parentContext;

public TreeViewAdapter(Context view, int myPaddingLeft) {
parentContext = view;
this.myPaddingLeft = myPaddingLeft;
}

public List<TreeNode> GetTreeNode() {
return treeNodes;
}

public void UpdateTreeNode(List<TreeNode> nodes) {
treeNodes = nodes;
}

public void RemoveAll() {
treeNodes.clear();
}

public Object getChild(int groupPosition, int childPosition) {
return treeNodes.get(groupPosition).childs.get(childPosition);
}

public int getChildrenCount(int groupPosition) {
return treeNodes.get(groupPosition).childs.size();
}

static public TextView getTextView(Context context) {
AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT, ItemHeight);

TextView textView = new TextView(context);
textView.setLayoutParams(lp);
textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
return textView;
}

public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
TextView textView = getTextView(this.parentContext);
textView.setText(getChild(groupPosition, childPosition).toString());
textView.setPadding(myPaddingLeft + PaddingLeft, 0, 0, 0);
return textView;
}

public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
TextView textView = getTextView(this.parentContext);
textView.setText(getGroup(groupPosition).toString());
textView.setPadding(myPaddingLeft + (PaddingLeft >> 1), 0, 0, 0);
return textView;
}

public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}

public Object getGroup(int groupPosition) {
return treeNodes.get(groupPosition).parent;
}

public int getGroupCount() {
return treeNodes.size();
}

public long getGroupId(int groupPosition) {
return groupPosition;
}

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

public boolean hasStableIds() {
return true;
}
}