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：
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<?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：
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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：
希望本文所述对大家学习android软件编程有所帮助。
