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----------------//    @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，程序运行后截图如下：

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