Android中ExpandableListView控件基本使用

             本文採用一个Demo来展示Android中ExpandableListView控件的使用，如怎样在组/子ListView中绑定数据源。直接上代码例如以下：

程序结构图：

layout文件夹下的 main.xml 文件源代码例如以下：

<?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"><!-- 我们会自定义listview的显示方式（在另外一个布局文件中边）不用默认的方式 假设自定义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 , 假设这是为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源代码例如以下：

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. */@Overridepublic 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、子列表加入数据* @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----------------//@Overridepublic Object getChild(int groupPosition, int childPosition) {return child.get(groupPosition).get(childPosition);}@Overridepublic long getChildId(int groupPosition, int childPosition) {return childPosition;}@Overridepublic int getChildrenCount(int groupPosition) {return child.get(groupPosition).size();}@Overridepublic View getChildView(int groupPosition, int childPosition,boolean isLastChild, View convertView, ViewGroup parent) {String string = child.get(groupPosition).get(childPosition); return getGenericView(string);}//----------------Group----------------//@Overridepublic Object getGroup(int groupPosition) {return group.get(groupPosition);}				@Overridepublic long getGroupId(int groupPosition) {return groupPosition;}	@Overridepublic int getGroupCount() {return group.size();}	@Overridepublic 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;  }  @Overridepublic boolean hasStableIds() {// TODO Auto-generated method stubreturn false;}		@Overridepublic boolean isChildSelectable(int groupPosition, int childPosition) {// TODO Auto-generated method stubreturn true;}}
}

最后，程序执行后截图例如以下：