ANDROID_MARS学习笔记_S02_004_ExpandableListActivity

1.main.xml

 <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>

2.group.xml

 <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>

3.child.xml

 <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>

4.java

 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);
     }

 }