android 二级菜单实现

xml文件

<?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>

java文件

主文件

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();
                        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;
        }

    };
}

两个适配器文件

1、

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;
    }
}

2、

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;
        }
    }