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;        }    }