ANDROID_MARS学习笔记_S02_004_ExpandableListActivity

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.s02_e03_expandablelistactivity.MainActivity" >

<ExpandableListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@id/android:list"
android:background="#00FF00"
android:layout_weight="1"
android:drawSelectorOnTop="true"/>
<TextView
android:id="@id/android:empty"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FF0000"
android:text="No data"/>

</RelativeLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.s02_e03_expandablelistactivity.MainActivity" >

<TextView android:id="@+id/groupTo"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingLeft="60px"
android:paddingTop="10px"
android:paddingBottom="10px"
android:textSize="26sp"
android:background="#cccccc"
android:text="No group data" />

</RelativeLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.s02_e03_expandablelistactivity.MainActivity" >

<TextView android:id="@+id/childTo"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingLeft="50px"
android:paddingTop="5px"
android:paddingBottom="5px"
android:textSize="20sp"
android:text="No child data" />

</RelativeLayout>

package com.example.s02_e03_expandablelistactivity;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.widget.SimpleExpandableListAdapter;

/*
* 创建一个Activity，继承ExpandableListAcitivty
*/
public class MainActivity extends ExpandableListActivity {
/** Called when the activity is first created. */
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

//定义一个List，该List对象为一级条目提供数据
List<Map<String, String>> groups = new ArrayList<Map<String, String>>();
Map<String,String> group1 = new HashMap<String,String>();
group1.put("group", "group1");
Map<String, String> group2 = new HashMap<String, String>();
group2.put("group", "group2");
groups.add(group1);
groups.add(group2);

//定义一个List，该List对象为第一个一级条目提供二级条目的数据
List<Map<String,String>> child1 = new ArrayList<Map<String,String>>();
Map<String, String> child1Data1 = new HashMap<String, String>();
child1Data1.put("child", "child1Data1");
child1.add(child1Data1);
Map<String,String> child1Data2 = new HashMap<String,String>();
child1Data2.put("child", "child1Data2");
child1.add(child1Data2);

//定义一个List,该List对象为第二个一级条目提供二级条目的数据
List<Map<String, String>> child2 = new ArrayList<Map<String, String>>();
Map<String, String> child2Data = new HashMap<String, String>();
child2Data.put("child", "child2Data");
child2.add(child2Data);

//定义一个List，该List对象用来存储所有的二级条目的数据
List<List<Map<String, String>>> childs = new ArrayList<List<Map<String, String>>>();
childs.add(child1);
childs.add(child2);

//生成一个SimpleExpandableListAdapter对象
//1.context
//2.一级条目的数据
//3.用来设置一级条目样式的布局文件
//4.指定一级条目数据的key
//5.指定一级条目数据显示控件的id
//6.指定二级条目的数据
//7.用来设置二级条目样式的布局文件
//8.指定二级条目数据的key
//9.指定二级条目数据显示控件的id
SimpleExpandableListAdapter sela = new SimpleExpandableListAdapter(this, groups, R.layout.group, new String[] {"group"}, new int[] {R.id.groupTo}, childs, R.layout.child, new String[] {"child"}, new int[] {R.id.childTo});
//将SimpleExpandableListAdapter对象设置给当前的ExpandableListActivity
setListAdapter(sela);
}

}