Android ExpandableListActivity 学习札记_Android

Android ExpandableListActivity 学习笔记

转载自http://blog.csdn.net/xiangyong2008/archive/2010/03/06/5351969.aspx

ExpandableListActivity:

???An activity that displays an expandable list of items by binding to a data source implementing the ExpandableListAdapter, and exposes event handlers when the user selects an item.

? 即，可扩展的list，单击某个item后，又可显示一个子list。它的数据通过绑定到ExpandableListAdapter或者ExpandableListAdapter的子类上。

示例1—通过SimpelExpandableListAdapter绑定数据：

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public?class?ExpandableList3?extends?ExpandableListActivity?{??
????private?static?final?String?NAME?=?"NAME";??
????private?static?final?String?IS_EVEN?=?"IS_EVEN";??
??????
????private?ExpandableListAdapter?mAdapter;??
??????
????@Override??
????public?void?onCreate(Bundle?savedInstanceState)?{??
????????super.onCreate(savedInstanceState);??
??
????????List<Map<String,?String>>?groupData?=?new?ArrayList<Map<String,?String>>();??
????????List<List<Map<String,?String>>>?childData?=?new?ArrayList<List<Map<String,?String>>>();??
????????for?(int?i?=?0;?i?<?20;?i++)?{??
????????????Map<String,?String>?curGroupMap?=?new?HashMap<String,?String>();??
????????????groupData.add(curGroupMap);??
????????????curGroupMap.put(NAME,?"Group?"?+?i);??
????????????curGroupMap.put(IS_EVEN,?(i?%?2?==?0)???"This?group?is?even"?:?"This?group?is?odd");??
??????????????
????????????List<Map<String,?String>>?children?=?new?ArrayList<Map<String,?String>>();??
????????????for?(int?j?=?0;?j?<?15;?j++)?{??
????????????????Map<String,?String>?curChildMap?=?new?HashMap<String,?String>();??
????????????????children.add(curChildMap);??
????????????????curChildMap.put(NAME,?"Child?"?+?j);??
????????????????curChildMap.put(IS_EVEN,?(j?%?2?==?0)???"This?child?is?even"?:?"This?child?is?odd");??
????????????}??
????????????childData.add(children);??
????????}??
??????????
????????//?Set?up?our?adapter??
????????mAdapter?=?new?SimpleExpandableListAdapter(??
????????????????this,??
????????????????groupData,??//?存储父list的数据??
????????????????android.R.layout.simple_expandable_list_item_2,?//父list的现实方式??
????????????????new?String[]?{?NAME,IS_EVEN},????????????????????//?父list需要显示的数据??
????????????new?int[]?{?android.R.id.text1,android.R.id.text2},?//?父list的数据绑定到的view??
????????????????childData,??????????????????????????????????????//子list的数据??
????????????????android.R.layout.simple_expandable_list_item_2,??
????????????????new?String[]?{?NAME,?IS_EVEN?},??
????????????????new?int[]?{?android.R.id.text1,?android.R.id.text2?}??
????????????????);??
????????setListAdapter(mAdapter);??
????}??
??
}??

注意：android.R.layout.simple_expandable_list_item_1：表示只显示一个TextView的数据，即R.id.text1

????????? android.R.layout.simple_expandable_list_item_2：表示显示二个TextView的数据，即R.id.text1，R.id,text2

???????? android.R.layout.simple_expandable_list_item_2.xml(在R.layout中)文件的布局如下：

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<?xml?version="1.0"?encoding="utf-8"?>??
?<LinearLayout?xmlns:android="http://schemas.android.com/apk/res/android"??
?????android:layout_width="fill_parent"??
?????android:layout_height="wrap_content"??
?????android:orientation="vertical">??
???
?????<TextView?android:id="@+id/text1"??
?????????android:textSize="16sp"??
?????????android:textStyle="bold"??
?????????android:layout_width="fill_parent"??
?????????android:layout_height="wrap_content"/>??
???
?????<TextView?android:id="@+id/text2"??
?????????android:textSize="16sp"??
?????????android:layout_width="fill_parent"??
?????????android:layout_height="wrap_content"/>??
?</LinearLayout>??

示例2—通过SimpleCussorTreeAdapter绑定数据：

view plaintext-decoration: none; color: #a0a0a0; background-image: none; background-color: inherit; margin-top:

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