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);
    }

}