Android中ExpandableListView控件的使用

本文采用一个Demo来展示Android中ExpandableListView控件的使用，如如何在组/子ListView中绑定数据源。直接上代码如下：

程序结构图：

layout目录下的 main.xml 文件源码如下：

<?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">
    <!-- 我们会自己定义listview的显示方式（在另外一个布局文件里边）不用默认的方式
         如果自定义listview的显示方式这里这个android:id="@id/android:list" 必须这样写 -->
    <!-- android:drawSelectOnTop="false"此属性用来设置listview上的背景颜色会不会
     挡住（覆盖）内容 , 如果这是为false就表示不会覆盖掉 -->
    <ExpandableListView
        android:id="@id/android:list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:drawSelectorOnTop="false"/>
</LinearLayout>

包 com.andyidea.demo中ContactsActivity.java源码如下：

package com.andyidea.demo;

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

import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

public class ContactsActivity extends ExpandableListActivity {

    List<String> group;           //组列表
    List<List<String>> child;     //子列表
    ContactsInfoAdapter adapter;  //数据适配器

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);  //设置为无标题
        setContentView(R.layout.main);
        getExpandableListView().setBackgroundResource(R.drawable.default_bg);

        initializeData();
        getExpandableListView().setAdapter(new ContactsInfoAdapter());
        getExpandableListView().setCacheColorHint(0);  //设置拖动列表的时候防止出现黑色背景
    }

    /**
     * 初始化组、子列表数据
     */
    private void initializeData(){
        group = new ArrayList<String>();
        child = new ArrayList<List<String>>();

        addInfo("Andy",new String[]{"male","138123***","GuangZhou"});
        addInfo("Fairy",new String[]{"female","138123***","GuangZhou"});
        addInfo("Jerry",new String[]{"male","138123***","ShenZhen"});
        addInfo("Tom",new String[]{"female","138123***","ShangHai"});
        addInfo("Bill",new String[]{"male","138231***","ZhanJiang"});

    }

    /**
     * 模拟给组、子列表添加数据
     * @param g-group
     * @param c-child
     */
    private void addInfo(String g,String[] c){
        group.add(g);
        List<String> childitem = new ArrayList<String>();
        for(int i=0;i<c.length;i++){
            childitem.add(c[i]);
        }
        child.add(childitem);
    }

    class ContactsInfoAdapter extends BaseExpandableListAdapter{


        //-----------------Child----------------//
        @Override
        public Object getChild(int groupPosition, int childPosition) {
            return child.get(groupPosition).get(childPosition);
        }

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

        @Override
        public int getChildrenCount(int groupPosition) {
            return child.get(groupPosition).size();
        }

        @Override
        public View getChildView(int groupPosition, int childPosition,
                boolean isLastChild, View convertView, ViewGroup parent) {
            String string = child.get(groupPosition).get(childPosition);
            return getGenericView(string);
        }

        //----------------Group----------------//
        @Override
        public Object getGroup(int groupPosition) {
            return group.get(groupPosition);
        }

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

        @Override
        public int getGroupCount() {
            return group.size();
        }

        @Override
        public View getGroupView(int groupPosition, boolean isExpanded,
                View convertView, ViewGroup parent) {
            String string = group.get(groupPosition);
            return getGenericView(string);
        }

        //创建组/子视图
        public TextView getGenericView(String s) {
            // Layout parameters for the ExpandableListView
            AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                    ViewGroup.LayoutParams.FILL_PARENT, 40);

            TextView text = new TextView(ContactsActivity.this);
            text.setLayoutParams(lp);
            // Center the text vertically
            text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
            // Set the text starting position
            text.setPadding(36, 0, 0, 0);

            text.setText(s);
            return text;
        }


        @Override
        public boolean hasStableIds() {
            // TODO Auto-generated method stub
            return false;
        }

        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            // TODO Auto-generated method stub
            return true;
        }

    }
}

最后，程序运行后截图如下：