<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"     android:layout_width="fill_parent"    android:layout_height="fill_parent"><ExpandableListView android:id="@+id/elistview"        android:layout_width="fill_parent"        android:layout_height="wrap_content" /></LinearLayout>

package org.lxh.demo;

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;// 继承BaseExpandableListAdapter并覆写类中的抽象方法public class MyExpandableListAdapter extends BaseExpandableListAdapter {// 组名称    public String[] groups = { "我的好友", "家人", "同事", "黑名单" };    // 定义组项    public String[][] children = {            { "董鸣楠", "王月清", "周艳军" },             { "父亲", "母亲" }, { "刘宏伟", "李祺", "刘媛" },            { "票贩子", "造假商" } };        // 保存上下文对象    private Context context = null;        // 构造方法接收    public MyExpandableListAdapter(Context context) {                this.context = context;    }    @Override   // 取得指定的子项    public Object getChild(int groupPosition, int childPosition) {    return this.children[groupPosition][childPosition];    }

    @Override   // 取得子项ID    public long getChildId(int groupPosition, int childPosition) {    return childPosition;    }

// 自定义方法，建立文本    public TextView buildTextView() {        // 指定布局参数        AbsListView.LayoutParams param = new AbsListView.LayoutParams(                ViewGroup.LayoutParams.FILL_PARENT, 35);// 创建TextView        TextView textView = new TextView(this.context);                        textView.setLayoutParams(param);    // 设置布局参数        textView.setTextSize(15.0f);        // 设置文字大小        textView.setGravity(Gravity.LEFT);    // 左对齐        textView.setPadding(40, 8, 3, 3);    // 间距        return textView;                    // 返回组件

    }

    @Override   // 返回子项组件    public View getChildView(int groupPosition, int childPosition,boolean isLastChild, View convertView, ViewGroup parent) {// 创建TextView        TextView textView = buildTextView();    // 设置显示文字        textView.setText(getChild(groupPosition,childPosition).toString());                            return textView;

    }

    @Override   // 取得子项个数    public int getChildrenCount(int groupPosition) {    // 取得子项个数        return this.children[groupPosition].length;                        }

    @Override   // 取得组对象    public Object getGroup(int groupPosition) {                        return this.groups[groupPosition];    }

    @Override   // 取得组个数    public int getGroupCount() {                                    return this.groups.length;    }

    @Override   // 取得组ID    public long getGroupId(int groupPosition) {                        return groupPosition;    }

    @Override    // 取得组显示组件    public View getGroupView(int groupPosition, boolean isExpanded,            View convertView, ViewGroup parent) {        // 建立组件        TextView textView = buildTextView();// 设置文字        textView.setText(this.getGroup(groupPosition).toString());    return textView;    }

    @Overridepublic boolean hasStableIds() {return true;     }

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

}

package org.lxh.demo;

import android.app.Activity;import android.os.Bundle;import android.view.ContextMenu;import android.view.ContextMenu.ContextMenuInfo;import android.view.View;import android.widget.ExpandableListAdapter;import android.widget.ExpandableListView;import android.widget.ExpandableListView.OnChildClickListener;import android.widget.ExpandableListView.OnGroupClickListener;import android.widget.ExpandableListView.OnGroupCollapseListener;import android.widget.ExpandableListView.OnGroupExpandListener;import android.widget.Toast;

public class MyExpandableListViewDemo extends Activity {// 定义树型组件    private ExpandableListView elistview = null;    // 定义适配器对象    private ExpandableListAdapter adapter = null;            

    @Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);// 默认布局管理器        super.setContentView(R.layout.main);     // 取得组件        this.elistview = (ExpandableListView) super.findViewById(R.id.elistview);     // 实例化适配器        this.adapter = new MyExpandableListAdapter(this);    // 设置适配器        this.elistview.setAdapter(this.adapter);    // 注册上下文菜单        super.registerForContextMenu(this.elistview);         // 设置子项单击事件        this.elistview.setOnChildClickListener(new OnChildClickListenerImpl());            // 设置组项单击事件        this.elistview.setOnGroupClickListener(new OnGroupClickListenerImpl());            // 关闭分组事件        this.elistview.setOnGroupCollapseListener(new OnGroupCollapseListenerImpl());         // 展开分组事件        this.elistview.setOnGroupExpandListener(new OnGroupExpandListenerImpl());                 }

private class OnChildClickListenerImpl implements OnChildClickListener {        @Overridepublic boolean onChildClick(ExpandableListView parent, View v,int groupPosition, int childPosition, long id) {// 显示提示框            Toast.makeText(                    MyExpandableListViewDemo.this,                    "子选项被选中，groupPosition = " + groupPosition                            + "，childPosition = " + childPosition,                    Toast.LENGTH_SHORT).show();                return false;        }

    }

private class OnGroupClickListenerImpl implements OnGroupClickListener {

        @Overridepublic boolean onGroupClick(ExpandableListView parent, View v,int groupPosition, long id) {// 显示提示框            Toast.makeText(MyExpandableListViewDemo.this,                    "分组被选中，groupPosition = " + groupPosition,                    Toast.LENGTH_SHORT).show();                return false;        }

    }

private class OnGroupCollapseListenerImpl implements            OnGroupCollapseListener {

        @Overridepublic void onGroupCollapse(int groupPosition) {// 显示提示框            Toast.makeText(MyExpandableListViewDemo.this,                    "关闭分组，groupPosition = " + groupPosition,                     Toast.LENGTH_SHORT).show();                                        }

    }

private class OnGroupExpandListenerImpl implements OnGroupExpandListener {

        @Overridepublic void onGroupExpand(int groupPosition) {// 显示提示框            Toast.makeText(MyExpandableListViewDemo.this,                    "打开分组，groupPosition = " + groupPosition,                     Toast.LENGTH_SHORT).show();                                        }    }    @Overridepublic void onCreateContextMenu(ContextMenu menu, View view,            ContextMenuInfo menuInfo) {super.onCreateContextMenu(menu, view, menuInfo);        ExpandableListView.ExpandableListContextMenuInfo info =             (ExpandableListView.ExpandableListContextMenuInfo) menuInfo;// 取得操作的菜单项        int type = ExpandableListView.getPackedPositionType(info.packedPosition); // 取得菜单项所在的菜单组        int group = ExpandableListView.getPackedPositionGroup(info.packedPosition); // 取得子菜单项的索引        int child = ExpandableListView.getPackedPositionChild(info.packedPosition); // 显示提示框        Toast.makeText(MyExpandableListViewDemo.this,                "type = " + type + "，group = " + group + "，child = " + child,                Toast.LENGTH_SHORT).show();                        }}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="org.lxh.demo"      android:versionCode="1"      android:versionName="1.0"><uses-sdk android:minSdkVersion="5" />

<application android:icon="@drawable/icon" android:label="@string/app_name"><activity android:name=".MyExpandableListViewDemo"                  android:label="@string/app_name"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity>

</application></manifest>