Android布局设计之ListView使用XML数据源来分页加载

参考资料：http://www.cnblogs.com/hzl512/archive/2012/08/30/2663105.html

效果图：



MAINUI:

<?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="fill_parent"

android:background="#ffffffff"

android:orientation="vertical" >

<ListView

android:id="@+id/listview_bags"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:fastScrollEnabled="true"

android:focusable="true"

android:cacheColorHint="#ffffffff" />

</LinearLayout>

LoadUi:

<?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="fill_parent"

android:orientation="vertical" >

<Button

android:id="@+id/bt_load"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="加载更多数据" />

<ProgressBar

android:id="@+id/pg"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_gravity="center_horizontal"

android:visibility="gone" />

</LinearLayout>

domain:

<?xml version="1.0" encoding="UTF-8"?>

<persons>

<person id="1">

<name>huanren</name>

<age>22</age>

</person>

<person id="2">

<name>lixiangmei</name>

<age>21</age>

</person>

<person id="3">

<name>huanren</name>

<age>22</age>

</person>

<person id="4">

<name>huanren</name>

<age>22</age>

</person>

<person id="5">

<name>huanren</name>

<age>22</age>

</person>

<person id="6">

<name>huanren</name>

<age>22</age>

</person>

<person id="7">

<name>huanren</name>

<age>22</age>

</person>

<person id="8">

<name>huanren</name>

<age>22</age>

</person>

<person id="9">

<name>huanren</name>

<age>22</age>

</person>

<person id="10">

<name>huanren</name>

<age>22</age>

</person>

<person id="11">

<name>huanren</name>

<age>22</age>

</person>

<person id="12">

<name>huanren</name>

<age>22</age>

</person>

<person id="13">

<name>huanren</name>

<age>22</age>

</person>

<person id="14">

<name>huanren</name>

<age>22</age>

</person>

<person id="15">

<name>huanren</name>

<age>22</age>

</person>

<person id="16">

<name>huanren</name>

<age>22</age>

</person>

<person id="17">

<name>huanren</name>

<age>22</age>

</person>

<person id="18">

<name>huanren</name>

<age>22</age>

</person>

<person id="19">

<name>huanren</name>

<age>22</age>

</person>

<person id="20">

<name>huanren</name>

<age>22</age>

</person>

<person id="21">

<name>huanren</name>

<age>22</age>

</person>

<person id="22">

<name>huanren</name>

<age>22</age>

</person>

<person id="23">

<name>huanren</name>

<age>22</age>

</person>

<person id="1">

<name>huanren</name>

<age>22</age>

</person>

<person id="2">

<name>lixiangmei</name>

<age>21</age>

</person>

<person id="3">

<name>huanren</name>

<age>22</age>

</person>

<person id="4">

<name>huanren</name>

<age>22</age>

</person>

<person id="5">

<name>huanren</name>

<age>22</age>

</person>

<person id="6">

<name>huanren</name>

<age>22</age>

</person>

<person id="7">

<name>huanren</name>

<age>22</age>

</person>

<person id="8">

<name>huanren</name>

<age>22</age>

</person>

<person id="9">

<name>huanren</name>

<age>22</age>

</person>

<person id="10">

<name>huanren</name>

<age>22</age>

</person>

<person id="11">

<name>huanren</name>

<age>22</age>

</person>

<person id="12">

<name>huanren</name>

<age>22</age>

</person>

<person id="13">

<name>huanren</name>

<age>22</age>

</person>

<person id="14">

<name>huanren</name>

<age>22</age>

</person>

<person id="15">

<name>huanren</name>

<age>22</age>

</person>

<person id="16">

<name>huanren</name>

<age>22</age>

</person>

<person id="17">

<name>huanren</name>

<age>22</age>

</person>

<person id="18">

<name>huanren</name>

<age>22</age>

</person>

<person id="19">

<name>huanren</name>

<age>22</age>

</person>

<person id="20">

<name>huanren</name>

<age>22</age>

</person>

<person id="21">

<name>huanren</name>

<age>22</age>

</person>

<person id="22">

<name>huanren</name>

<age>22</age>

</person>

<person id="23">

<name>huanren</name>

<age>22</age>

</person>

<person id="1">

<name>huanren</name>

<age>22</age>

</person>

<person id="2">

<name>lixiangmei</name>

<age>21</age>

</person>

<person id="3">

<name>huanren</name>

<age>22</age>

</person>

<person id="4">

<name>huanren</name>

<age>22</age>

</person>

<person id="5">

<name>huanren</name>

<age>22</age>

</person>

<person id="6">

<name>huanren</name>

<age>22</age>

</person>

<person id="7">

<name>huanren</name>

<age>22</age>

</person>

<person id="8">

<name>huanren</name>

<age>22</age>

</person>

<person id="9">

<name>huanren</name>

<age>22</age>

</person>

<person id="10">

<name>huanren</name>

<age>22</age>

</person>

<person id="11">

<name>huanren</name>

<age>22</age>

</person>

<person id="12">

<name>huanren</name>

<age>22</age>

</person>

<person id="13">

<name>huanren</name>

<age>22</age>

</person>

<person id="14">

<name>huanren</name>

<age>22</age>

</person>

<person id="15">

<name>huanren</name>

<age>22</age>

</person>

<person id="16">

<name>huanren</name>

<age>22</age>

</person>

<person id="17">

<name>huanren</name>

<age>22</age>

</person>

<person id="18">

<name>huanren</name>

<age>22</age>

</person>

<person id="19">

<name>huanren</name>

<age>22</age>

</person>

<person id="20">

<name>huanren</name>

<age>22</age>

</person>

<person id="21">

<name>huanren</name>

<age>22</age>

</person>

<person id="22">

<name>huanren</name>

<age>22</age>

</person>

<person id="23">

<name>huanren</name>

<age>22</age>

</person>

<person id="1">

<name>huanren</name>

<age>22</age>

</person>

<person id="2">

<name>lixiangmei</name>

<age>21</age>

</person>

<person id="3">

<name>huanren</name>

<age>22</age>

</person>

<person id="4">

<name>huanren</name>

<age>22</age>

</person>

<person id="5">

<name>huanren</name>

<age>22</age>

</person>

<person id="6">

<name>huanren</name>

<age>22</age>

</person>

<person id="7">

<name>huanren</name>

<age>22</age>

</person>

<person id="8">

<name>huanren</name>

<age>22</age>

</person>

<person id="9">

<name>huanren</name>

<age>22</age>

</person>

<person id="10">

<name>huanren</name>

<age>22</age>

</person>

<person id="11">

<name>huanren</name>

<age>22</age>

</person>

<person id="12">

<name>huanren</name>

<age>22</age>

</person>

<person id="13">

<name>huanren</name>

<age>22</age>

</person>

<person id="14">

<name>huanren</name>

<age>22</age>

</person>

<person id="15">

<name>huanren</name>

<age>22</age>

</person>

<person id="16">

<name>huanren</name>

<age>22</age>

</person>

<person id="17">

<name>huanren</name>

<age>22</age>

</person>

<person id="18">

<name>huanren</name>

<age>22</age>

</person>

<person id="19">

<name>huanren</name>

<age>22</age>

</person>

<person id="20">

<name>huanren</name>

<age>22</age>

</person>

<person id="21">

<name>huanren</name>

<age>22</age>

</person>

<person id="22">

<name>huanren</name>

<age>22</age>

</person>

<person id="23">

<name>huanren</name>

<age>22</age>

</person>

<person id="1">

<name>huanren</name>

<age>22</age>

</person>

<person id="2">

<name>lixiangmei</name>

<age>21</age>

</person>

<person id="3">

<name>huanren</name>

<age>22</age>

</person>

<person id="4">

<name>huanren</name>

<age>22</age>

</person>

<person id="5">

<name>huanren</name>

<age>22</age>

</person>

<person id="6">

<name>huanren</name>

<age>22</age>

</person>

<person id="7">

<name>huanren</name>

<age>22</age>

</person>

<person id="8">

<name>huanren</name>

<age>22</age>

</person>

<person id="9">

<name>huanren</name>

<age>22</age>

</person>

<person id="10">

<name>huanren</name>

<age>22</age>

</person>

<person id="11">

<name>huanren</name>

<age>22</age>

</person>

<person id="12">

<name>huanren</name>

<age>22</age>

</person>

<person id="13">

<name>huanren</name>

<age>22</age>

</person>

<person id="14">

<name>huanren</name>

<age>22</age>

</person>

<person id="15">

<name>huanren</name>

<age>22</age>

</person>

<person id="16">

<name>huanren</name>

<age>22</age>

</person>

<person id="17">

<name>huanren</name>

<age>22</age>

</person>

<person id="18">

<name>huanren</name>

<age>22</age>

</person>

<person id="19">

<name>huanren</name>

<age>22</age>

</person>

<person id="20">

<name>huanren</name>

<age>22</age>

</person>

<person id="21">

<name>huanren</name>

<age>22</age>

</person>

<person id="22">

<name>huanren</name>

<age>22</age>

</person>

<person id="23">

<name>huanren</name>

<age>22</age>

</person>

</persons>

解析XML:

/**

*

*/

package com.diamond.util.services;

import java.io.InputStream;

import java.util.ArrayList;

import java.util.List;

import org.xmlpull.v1.XmlPullParser;

import org.xmlpull.v1.XmlPullParserException;

import android.util.Xml;

import com.diamond.util.domain.Person;

/**

* 作用：Pull解析XML

* 创建时间：2012-7-14 上午10:29:29

* 修改时间：2012-7-14 上午10:29:29

* @author Hzl520

*/

public class PullPersonPaseService {

/**

* 作用：以Pull方式获取XML信息

* 步骤：看注释

* 创建时间：2012-7-14 上午10:31:25

* 修改时间：2012-7-14 上午10:31:25

* @param inputStream

* @return

* @throws Exception

*/

public List<Person> getPersons(InputStream inputStream) throws Exception {

List<Person> persons=null;

Person person=null;

XmlPullParser parser=Xml.newPullParser();

parser.setInput(inputStream, "UTF-8");

//获取解析事件，和SAX类似

int eventType=parser.getEventType();

//使用各个事件解析XML

while(eventType!=XmlPullParser.END_DOCUMENT){

switch (eventType) {

case XmlPullParser.START_DOCUMENT:

//开始遍历节点的时候实例化集合

persons=new ArrayList<Person>();

break;

case XmlPullParser.START_TAG:

String name=parser.getName();

if(name.equals("person")){

person=new Person();

person.setId(new Integer(parser.getAttributeValue(0)));

}

if (person!=null) {

if (name.equals("name")) {

person.setName(parser.nextText());

}

if (name.equals("age")) {

person.setAge(new Short(parser.nextText()));

}

}

break;

case XmlPullParser.END_TAG:

if(parser.getName().equals("person")){

persons.add(person);

person=null;

}

break;

}

//遍历下一个节点

eventType=parser.next();

}

return persons;

}

}

main:

/**

*

*/

package com.diamond.util.widget;

import java.io.InputStream;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.lang.reflect.Field;

import com.diamond.util.R;

import com.diamond.util.domain.Person;

import com.diamond.util.services.PullPersonPaseService;

import android.app.Activity;

import android.os.Bundle;

import android.os.Handler;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.AbsListView;

import android.widget.AbsListView.OnScrollListener;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.Button;

import android.widget.ListView;

import android.widget.ProgressBar;

import android.widget.SimpleAdapter;

import android.widget.Toast;

import android.graphics.drawable.Drawable;

/**

* 作用： 创建时间：2012-8-28 下午7:32:23 修改时间：2012-8-28 下午7:32:23

*

* @author Hzl520

*/

public class ListViewFoxmlLoadActivity extends Activity implements

OnScrollListener {

// ListView的Adapter

private SimpleAdapter mSimpleAdapter;

private ListView lv;

private Button bt;

private ProgressBar pg;

private ArrayList<HashMap<String, String>> list;

// ListView底部View

private View moreView;

private Handler handler;

// 设置一个最大的数据条数，超过即不再加载

private int MaxDateNum;

// 最后可见条目的索引

private int lastVisibleIndex;

PullPersonPaseService pullPersonPaseService = null;

/*

* 作用：初始化加载中... 步骤：看注释 创建时间：2012-8-28 下午7:33:06 修改时间：2012-8-28 下午7:33:06

*

* @param savedInstanceState

*/

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.listviewfoxmlload);

lv = (ListView) findViewById(R.id.listview_bags);

// 实例化底部布局

moreView = getLayoutInflater().inflate(

R.layout.listviewfoxmlloadmoredata, null);

bt = (Button) moreView.findViewById(R.id.bt_load);

pg = (ProgressBar) moreView.findViewById(R.id.pg);

handler = new Handler();

// 数据处理

list = new ArrayList<HashMap<String, String>>();

pullPersonPaseService = new PullPersonPaseService();

// 使用类加载器获取本地XML的输入流

InputStream inputStream = getClass().getClassLoader()

.getResourceAsStream("com/diamond/util/access/person.xml");

try {

List<Person> persons = pullPersonPaseService

.getPersons(inputStream);

MaxDateNum = persons.size();// 设置最大数据条数

// 用map来装载数据，初始化10条数据

for (Person person : persons) {

if (persons.indexOf(person) < 10) {// 获取XML中Top10的内容

HashMap<String, String> map = new HashMap<String, String>();

map.put("ItemTitle", person.getId().toString());

map.put("ItemText", person.getName().toString());

list.add(map);

} else {

continue;

}

}

} catch (Exception e) {

e.printStackTrace();

}

// 实例化SimpleAdapter

mSimpleAdapter = new SimpleAdapter(this, list,

R.layout.listviewfoxmlloadmapitem, new String[] { "ItemTitle",

"ItemText" }, new int[] { R.id.tv_title,

R.id.tv_content });

// 加上底部View，注意要放在setAdapter方法前

lv.addFooterView(moreView);

lv.setAdapter(mSimpleAdapter);

// 绑定监听器

lv.setOnItemClickListener(new OnItemClickListener() {

@Override

public void onItemClick(AdapterView<?> parent, View view,

int position, long id) {

ListView listView = (ListView) parent;

HashMap<String, Object> itemmap = (HashMap<String, Object>) listView

.getItemAtPosition(position);

String title = itemmap.get("ItemTitle").toString();

Toast.makeText(getApplicationContext(), title, 1).show();

}

});

lv.setOnScrollListener(this);

bt.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

pg.setVisibility(View.VISIBLE);// 将进度条可见

bt.setVisibility(View.GONE);// 按钮不可见

handler.postDelayed(new Runnable() {

@Override

public void run() {

loadMoreDate();// 加载更多数据

bt.setVisibility(View.VISIBLE);

pg.setVisibility(View.GONE);

mSimpleAdapter.notifyDataSetChanged();// 通知listView刷新数据

}

}, 2000);

}

});

}

/**

* 作用： 步骤：看注释 创建时间：2012-8-28 下午8:31:52 修改时间：2012-8-28 下午8:31:52

*/

private void loadMoreDate() {

int count = mSimpleAdapter.getCount();// 列表加载的当前数据的长度

pullPersonPaseService = new PullPersonPaseService();

// 使用类加载器获取本地XML的输入流

InputStream inputStream = getClass().getClassLoader().getResourceAsStream("com/diamond/util/access/person.xml");

try {

List<Person> persons = pullPersonPaseService

.getPersons(inputStream);

if (count + 5 < MaxDateNum) {

// 每次加载5条

for (Person person : persons) {

if (persons.indexOf(person) >= count

&& persons.indexOf(person) < count + 5) {

HashMap<String, String> map = new HashMap<String, String>();

map.put("ItemTitle", person.getId().toString());

map.put("ItemText", person.getName().toString());

list.add(map);

} else {

continue;

}

}

} else {

// 数据已经不足5条

for (Person person : persons) {

if (persons.indexOf(person) >= count

&& persons.indexOf(person) < MaxDateNum) {

HashMap<String, String> map = new HashMap<String, String>();

map.put("ItemTitle", person.getId().toString());

map.put("ItemText", person.getName().toString());

list.add(map);

} else {

continue;

}

}

}

} catch (Exception e) {

e.printStackTrace();

}

}

/*

* 作用： 步骤：看注释 创建时间：2012-8-28 下午7:32:23 修改时间：2012-8-28 下午7:32:23

*

* @param view

*

* @param scrollState

*/

@Override

public void onScrollStateChanged(AbsListView view, int scrollState) {

// 滑到底部后自动加载，判断listview已经停止滚动并且最后可视的条目等于adapter的条目

if (scrollState == OnScrollListener.SCROLL_STATE_IDLE

&& lastVisibleIndex == mSimpleAdapter.getCount()) {

// 当滑到底部时自动加载

// pg.setVisibility(View.VISIBLE);

// bt.setVisibility(View.GONE);

// handler.postDelayed(new Runnable() {

//

// @Override

// public void run() {

// loadMoreDate();

// bt.setVisibility(View.VISIBLE);

// pg.setVisibility(View.GONE);

// mSimpleAdapter.notifyDataSetChanged();

// }

//

// }, 2000);

}

}

/*

* 作用： 步骤：看注释 创建时间：2012-8-28 下午7:32:23 修改时间：2012-8-28 下午7:32:23

*

* @param view

*

* @param firstVisibleItem

*

* @param visibleItemCount

*

* @param totalItemCount

*/

@Override

public void onScroll(AbsListView view, int firstVisibleItem,

int visibleItemCount, int totalItemCount) {

// 计算最后可见条目的索引

lastVisibleIndex = firstVisibleItem + visibleItemCount - 1;

// 所有的条目已经和最大条数相等，则移除底部的View

if (totalItemCount == MaxDateNum + 1) {

bt.setText("数据全部加载完成，没有更多数据！");

}

}

}