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"?></p><p><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"</p><p> android:orientation="vertical"</p><p> android:layout_width="fill_parent"</p><p> android:layout_height="fill_parent"></p><p> <!-- 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 </p><p> 如果自定义listview的显示方式这里这个android:id="@id/android:<b style="color:black;background-color:#A0FFFF">list</b>" 必须这样写 --></p><p> <!-- android:drawSelectOnTop="false"此属性用来设置listview上的背景颜色会不会</p><p> 挡住（覆盖）内容 , 如果这是为false就表示不会覆盖掉 --> </p><p> <ExpandableListView </p><p> android:id="@id/android:<b style="color:black;background-color:#A0FFFF">list</b>" </p><p> android:layout_width="fill_parent" </p><p> android:layout_height="wrap_content" </p><p> android:layout_weight="1" </p><p> android:drawSelectorOnTop="false"/> </p><p></LinearLayout></p><p>
包 com.andyidea.demo中ContactsActivity.java源码如下：
package com.andyidea.demo;</p><p>import java.util.ArrayList;</p><p>import java.util.<b style="color:black;background-color:#A0FFFF">List</b>;</p><p>import android.app.ExpandableListActivity;</p><p>import android.os.Bundle;</p><p>import android.<b style="color:black;background-color:#99ff99">view</b>.Gravity;</p><p>import android.<b style="color:black;background-color:#99ff99">view</b>.<b style="color:black;background-color:#99ff99">View</b>;</p><p>import android.<b style="color:black;background-color:#99ff99">view</b>.ViewGroup;</p><p>import android.<b style="color:black;background-color:#99ff99">view</b>.Window;</p><p>import android.widget.AbsListView;</p><p>import android.widget.BaseExpandableListAdapter;</p><p>import android.widget.TextView;</p><p>public class ContactsActivity extends ExpandableListActivity {</p><p> </p><p> <b style="color:black;background-color:#A0FFFF">List</b><String> group; //组列表</p><p> <b style="color:black;background-color:#A0FFFF">List</b><<b style="color:black;background-color:#A0FFFF">List</b><String>> child; //子列表</p><p> ContactsInfoAdapter adapter; //数据适配器</p><p> </p><p> /** Called when the activity is first created. */</p><p> @Override</p><p> public void onCreate(Bundle savedInstanceState) {</p><p> super.onCreate(savedInstanceState);</p><p> requestWindowFeature(Window.FEATURE_NO_TITLE); //设置为无标题</p><p> setContentView(R.layout.main);</p><p> getExpandableListView().setBackgroundResource(R.drawable.default_bg);</p><p> </p><p> initializeData();</p><p> getExpandableListView().setAdapter(new ContactsInfoAdapter());</p><p> getExpandableListView().setCacheColorHint(0); //设置拖动列表的时候防止出现黑色背景</p><p> }</p><p> </p><p> /**</p><p> * 初始化组、子列表数据</p><p> */</p><p> private void initializeData(){</p><p> group = new ArrayList<String>();</p><p> child = new ArrayList<<b style="color:black;background-color:#A0FFFF">List</b><String>>();</p><p> </p><p> addInfo("Andy",new String[]{"male","138123***","GuangZhou"});</p><p> addInfo("Fairy",new String[]{"female","138123***","GuangZhou"});</p><p> addInfo("Jerry",new String[]{"male","138123***","ShenZhen"});</p><p> addInfo("Tom",new String[]{"female","138123***","ShangHai"});</p><p> addInfo("Bill",new String[]{"male","138231***","ZhanJiang"});</p><p> </p><p> }</p><p> </p><p> /**</p><p> * 模拟给组、子列表添加数据</p><p> * @param g-group</p><p> * @param c-child</p><p> */</p><p> private void addInfo(String g,String[] c){</p><p> group.add(g);</p><p> <b style="color:black;background-color:#A0FFFF">List</b><String> childitem = new ArrayList<String>();</p><p> for(int i=0;i<c.length;i++){</p><p> childitem.add(c[i]);</p><p> }</p><p> child.add(childitem);</p><p> }</p><p> </p><p> class ContactsInfoAdapter extends BaseExpandableListAdapter{</p><p> </p><p> //-----------------Child----------------//</p><p> @Override</p><p> public Object getChild(int groupPosition, int childPosition) {</p><p> return child.get(groupPosition).get(childPosition);</p><p> }</p><p> </p><p> @Override</p><p> public long getChildId(int groupPosition, int childPosition) {</p><p> return childPosition;</p><p> }</p><p> </p><p> @Override</p><p> public int getChildrenCount(int groupPosition) {</p><p> return child.get(groupPosition).size();</p><p> }</p><p> </p><p> @Override</p><p> public <b style="color:black;background-color:#99ff99">View</b> getChildView(int groupPosition, int childPosition,</p><p> boolean isLastChild, <b style="color:black;background-color:#99ff99">View</b> convertView, ViewGroup parent) {</p><p> String string = child.get(groupPosition).get(childPosition); </p><p> return getGenericView(string);</p><p> }</p><p> </p><p> //----------------Group----------------//</p><p> @Override</p><p> public Object getGroup(int groupPosition) {</p><p> return group.get(groupPosition);</p><p> } </p><p> @Override</p><p> public long getGroupId(int groupPosition) {</p><p> return groupPosition;</p><p> } </p><p> </p><p> @Override</p><p> public int getGroupCount() {</p><p> return group.size();</p><p> } </p><p> </p><p> @Override</p><p> public <b style="color:black;background-color:#99ff99">View</b> getGroupView(int groupPosition, boolean isExpanded,</p><p> <b style="color:black;background-color:#99ff99">View</b> convertView, ViewGroup parent) {</p><p> String string = group.get(groupPosition); </p><p> return getGenericView(string);</p><p> }</p><p> //创建组/子视图 </p><p> public TextView getGenericView(String s) { </p><p> // Layout parameters for the ExpandableListView </p><p> AbsListView.LayoutParams lp = new AbsListView.LayoutParams( </p><p> ViewGroup.LayoutParams.FILL_PARENT, 40);</p><p> </p><p> TextView text = new TextView(ContactsActivity.this); </p><p> text.setLayoutParams(lp); </p><p> // Center the text vertically </p><p> text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); </p><p> // Set the text starting position </p><p> text.setPadding(36, 0, 0, 0); </p><p> </p><p> text.setText(s); </p><p> return text; </p><p> } </p><p> </p><p> </p><p> @Override</p><p> public boolean hasStableIds() {</p><p> // TODO Auto-generated method stub</p><p> return false;</p><p> } </p><p> @Override</p><p> public boolean isChildSelectable(int groupPosition, int childPosition) {</p><p> // TODO Auto-generated method stub</p><p> return true;</p><p> }</p><p> </p><p> }</p><p>}
最后，程序运行后截图如下：
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