Android中ExpandableListView控件基本使用

             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：