Android控件之ExpandableListView

 

 

layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" 
	android:layout_width="fill_parent"
	android:layout_height="fill_parent">
	<ExpandableListView 
		android:id="@id/android:list"
		android:layout_width="fill_parent" 
		android:layout_height="fill_parent"
		android:drawSelectorOnTop="false">
	</ExpandableListView>
	<TextView 
		android:layout_width="fill_parent"
		android:layout_height="fill_parent" 
		android:id="@id/android:empty"
		android:text="No Data" />
</LinearLayout>

layout/childs.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" 
	android:layout_width="match_parent"
	android:layout_height="match_parent">
	<TextView 
		android:layout_width="fill_parent"
		android:layout_height="fill_parent" 
		android:id="@+id/child"
		android:textSize="15sp" 
		android:paddingLeft="25px" 
		android:paddingTop="10px"
		android:paddingRight="5px" 
		android:paddingBottom="10px" 
		android:text="No Data" />
</LinearLayout>

layout/groups.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" 
	android:layout_width="match_parent"
	android:layout_height="match_parent">
	<TextView 
		android:layout_width="fill_parent"
		android:layout_height="fill_parent" 
		android:id="@+id/group"
		android:textSize="25sp" 
		android:paddingLeft="35px" 
		android:paddingTop="10px"
		android:paddingRight="5px" 
		android:paddingBottom="10px" 
		android:text="No Data" />
</LinearLayout>

 

ExpandableListViewActivity.java

package com.zeph.android.expandablelistview.example;

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.view.View;
import android.widget.ExpandableListView;
import android.widget.SimpleExpandableListAdapter;

public class ExpandableListViewActivity extends ExpandableListActivity {
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		List<Map<String, String>> groups = new ArrayList<Map<String, String>>();
		// 创建两个一级条目标题
		Map<String, String> group1 = new HashMap<String, String>();
		group1.put("group", "音乐");
		Map<String, String> group2 = new HashMap<String, String>();
		group2.put("group", "歌词");
		groups.add(group1);
		groups.add(group2);
		// 创建一级条目下的的二级条目
		List<Map<String, String>> child1 = new ArrayList<Map<String, String>>();
		// 同样是在一级条目目录下创建两个对应的二级条目目录
		Map<String, String> childdata1 = new HashMap<String, String>();
		childdata1.put("child", "青花瓷");
		Map<String, String> childdata2 = new HashMap<String, String>();
		childdata2.put("child", "东风破");
		child1.add(childdata1);
		child1.add(childdata2);
		// 同上
		List<Map<String, String>> child2 = new ArrayList<Map<String, String>>();
		Map<String, String> childdata3 = new HashMap<String, String>();
		childdata3.put("child", "青花瓷.lrc");
		Map<String, String> childdata4 = new HashMap<String, String>();
		childdata4.put("child", "东风破.lrc");
		child2.add(childdata3);
		child2.add(childdata4);
		// 将二级条目放在一个集合里，供显示时使用
		List<List<Map<String, String>>> childs = new ArrayList<List<Map<String, String>>>();
		childs.add(child1);
		childs.add(child2);
		/**
		 * 使用SimpleExpandableListAdapter显示ExpandableListView 参数1.上下文对象Context
		 * 参数2.一级条目目录集合 参数3.一级条目对应的布局文件 参数4.fromto，就是map中的key，指定要显示的对象
		 * 参数5.与参数4对应，指定要显示在groups中的id 参数6.二级条目目录集合 参数7.二级条目对应的布局文件
		 * 参数8.fromto，就是map中的key，指定要显示的对象 参数9.与参数8对应，指定要显示在childs中的id
		 */
		SimpleExpandableListAdapter adapter = new SimpleExpandableListAdapter(
				this, groups, R.layout.groups, new String[] { "group" },
				new int[] { R.id.group }, childs, R.layout.childs,
				new String[] { "child" }, new int[] { R.id.child });
		setListAdapter(adapter);

	}

	/**
	 * 设置哪个二级目录被默认选中
	 */
	@Override
	public boolean setSelectedChild(int groupPosition, int childPosition,
			boolean shouldExpandGroup) {
		// do something
		return super.setSelectedChild(groupPosition, childPosition,
				shouldExpandGroup);
	}

	/**
	 * 设置哪个一级目录被默认选中
	 */
	@Override
	public void setSelectedGroup(int groupPosition) {
		// do something
		super.setSelectedGroup(groupPosition);
	}

	/**
	 * 当二级条目被点击时响应
	 */
	@Override
	public boolean onChildClick(ExpandableListView parent, View v,
			int groupPosition, int childPosition, long id) {
		// do something
		return super.onChildClick(parent, v, groupPosition, childPosition, id);
	}

}

 

转载自：http://android.tgbus.com/Android/tutorial/201110/373238.shtml