Listview动态加载网络数据Activity大概实现

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AbsListView.OnScrollListener;
import android.widget.LinearLayout.LayoutParams;

public class ListViewForLoading extends Activityimplements OnScrollListener {

private listViewAdapter adapter = new listViewAdapter();
ListView listView;
LinearLayout loadingLayout;
private Thread mThread;
/**
* 设置布局显示属性
*/
private LayoutParams mLayoutParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
/**
* 设置布局显示目标最大化属性
*/
private LayoutParams FFlayoutParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.FILL_PARENT,
LinearLayout.LayoutParams.FILL_PARENT);

private ProgressBar progressBar;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
}

private void init() {
// TODO Auto-generated method stub
// 线性布局
LinearLayout layout = new LinearLayout(this);
// 设置布局 水平方向
layout.setOrientation(LinearLayout.HORIZONTAL);
// 进度条
progressBar = new ProgressBar(this);
// 进度条显示位置
progressBar.setPadding(0,0,15,0);
// 把进度条加入到layout中
layout.addView(progressBar,mLayoutParams);
// 文本内容
TextView textView = new TextView(this);
textView.setText("加载中...");
textView.setGravity(Gravity.CENTER_VERTICAL);
// 把文本加入到layout中
layout.addView(textView,FFlayoutParams);
// 设置layout的重力方向，即对齐方式是
layout.setGravity(Gravity.CENTER);

// 设置ListView的页脚layout
loadingLayout = new LinearLayout(this);
loadingLayout.addView(layout,mLayoutParams);
loadingLayout.setGravity(Gravity.CENTER);

// 得到一个ListView用来显示条目
listView = (ListView) findViewById(R.id.tv);
// 添加到脚页显示
listView.addFooterView(loadingLayout);
// 给ListView添加适配器
listView.setAdapter(adapter);
// 给ListView注册滚动监听
listView.setOnScrollListener(this);
}

/**
* 要用用于生成显示数据
*
* @author huangbq
*
*/
class listViewAdapter extends BaseAdapter {
int count = 10;

public int getCount() {
return count;
}

public Object getItem(int pos) {
return pos;
}

public long getItemId(int pos) {
return pos;
}

public View getView(int pos,View v,ViewGroup p) {
TextView view;
if (v == null) {
view = new TextView(ListViewForLoading.this);
}else {
view = (TextView) v;
}
view.setText("ListItem " +pos);
view.setTextSize(20f);
view.setGravity(Gravity.CENTER);
view.setHeight(60);
return view;
}
}

@Override
public void onScroll(AbsListView view,int firstVisibleItem,
int visibleItemCount,int totalItemCount) {
// TODO Auto-generated method stub
if(firstVisibleItem+visibleItemCount==totalItemCount)
{
//开线程去下载网络数据
if (mThread == null || !mThread.isAlive()) {
mThread = new Thread() {
@Override
public void run() {
try {
//这里放你网络数据请求的方法，我在这里用线程休眠5秒方法来处理
Thread.sleep(5000);
}catch (InterruptedException e) {
e.printStackTrace();
}
Message message = new Message();
message.what = 1;
handler.sendMessage(message);
}
};
mThread.start();
}
}
}

@Override
public void onScrollStateChanged(AbsListView view,int scrollState) {
// TODO Auto-generated method stub
}

private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
switch (msg.what) {
case 1:
if (adapter.count <= 41) {
adapter.count += 10;
int currentPage = adapter.count / 10;
Toast.makeText(getApplicationContext(),"第" +currentPage +"页",Toast.LENGTH_LONG).show();
}else {
listView.removeFooterView(loadingLayout);
}
//重新刷新Listview的adapter里面数据
adapter.notifyDataSetChanged();
break;
default:
break;
}
}

};
}

package

com.jemsn.android;

002.

003.

004.

import

java.util.ArrayList;

005.

import

java.util.List;

006.

007.

import

org.json.JSONArray;

008.

009.

import

com.jemsn.util.DialogUtil;

010.

import

com.jemsn.util.Goods;

011.

import

com.jemsn.util.WebServiceUtil;

012.

013.

import

android.app.Activity;

014.

import

android.os.Bundle;

015.

import

android.os.Handler;

016.

import

android.util.Log;

017.

import

android.view.View;

018.

import

android.view.ViewGroup;

019.

import

android.widget.AbsListView;

020.

import

android.widget.AbsListView.OnScrollListener;

021.

import

android.widget.BaseAdapter;

022.

import

android.widget.Button;

023.

import

android.widget.EditText;

024.

import

android.widget.ListView;

025.

import

android.widget.TextView;

026.

import

android.widget.Toast;

027.

028.

public

class

AndroidQueryActivity

extends

Activity

implements

OnScrollListener
{

029.

030.

private

ListView
list_View;

031.

private

int

visibleLastIndex
=

0

;

//
最后的可视项索引

032.

private

int

visibleItemCount;

//
当前窗口可见项总数

033.

private

int

datasize
=

100

;

//
模拟数据集的条数

034.

private

PaginationAdapter
adapter;

035.

private

View
loadMoreView;

036.

private

Button
loadMoreButton,Search_Btn;

037.

private

Handler
handler =

new

Handler();

038.

private

EditText
SearcText;

039.

040.

/**
Called when the activity is first created. */

041.

@Override

042.

public

void

onCreate(Bundle
savedInstanceState) {

043.

super

.onCreate(savedInstanceState);

044.

setContentView(R.layout.view_item);

045.

SearcText
= (EditText) findViewById(R.id.text_SeGds);

046.

Search_Btn=(Button)findViewById(R.id.BtnGoods_Search);

047.

loadMoreView
= getLayoutInflater().inflate(R.layout.loadmore,

null

);

048.

loadMoreButton
= (Button) loadMoreView

049.

.findViewById(R.id.loadMoreButton);

050.

loadMoreButton.setOnClickListener(

new

View.OnClickListener()
{

051.

@Override

052.

public

void

onClick(View
v) {

053.

loadMoreButton.setText(

"正在加载中..."

);

//
设置按钮文字

054.

handler.postDelayed(

new

Runnable()
{

055.

056.

@Override

057.

public

void

run()
{

058.

loadMoreData();

059.

adapter.notifyDataSetChanged();

060.

Toast.makeText(AndroidQueryActivity.

this

,

"数据加载完!"

,
Toast.LENGTH_LONG).show();

061.

loadMoreButton.setText(

"查看更多..."

);

//
恢复按钮文字

062.

}

063.

},

2000

);

064.

065.

}

066.

});

067.

Search_Btn.setOnClickListener(

new

View.OnClickListener()
{

068.

069.

@Override

070.

public

void

onClick(View
v) {

071.

initializeAdapter();

072.

list_View.setAdapter(adapter);

073.

}

074.

});

075.

076.

list_View
= (ListView)findViewById(R.id.GoodsList);

077.

078.

list_View.addFooterView(loadMoreView);

//
设置列表底部视图

079.

Log.e(

"WangYOUHellow"

,

"Goods"

);

080.

initializeAdapter();

081.

082.

list_View.setAdapter(adapter);

083.

Log.e(

"WangYOUHellow"

,

"Hellow"

);

084.

list_View.setOnScrollListener(

this

);

085.

}

086.

087.

@Override

088.

public

void

onScrollStateChanged(AbsListView
view,

int

scrollState)
{

089.

int

itemsLastIndex
= adapter.getCount() -

1

;

//
数据集最后一项的索引

090.

int

lastIndex
= itemsLastIndex +

1

;

091.

if

(scrollState
== OnScrollListener.SCROLL_STATE_IDLE

092.

&&
visibleLastIndex == lastIndex) {

093.

//
如果是自动加载,可以在这里放置异步加载数据的代码

094.

}

095.

}

096.

097.

@Override

098.

public

void

onScroll(AbsListView
view,

int

firstVisibleItem,

099.

int

visibleItemCount,

int

totalItemCount)
{

100.

this

.visibleItemCount
= visibleItemCount;

101.

visibleLastIndex
=firstVisibleItem +visibleItemCount - 

1

;

102.

103.

//
如果所有的记录选项等于数据集的条数，则移除列表底部视图

104.

if

(totalItemCount
== datasize +

1

)
{

105.

//list_View.removeFooterView(loadMoreView);

106.

Toast.makeText(

this

,

"数据全部加载完!"

,
Toast.LENGTH_LONG).show();

107.

}

108.

}

109.

110.

/**

111.

*
初始化ListView的适配器

112.

*/

113.

private

void

initializeAdapter()
{

114.

Log.e(

"WangYOUHellow"

,

"Bad"

);

115.

try

{

116.

String
Parame = SearcText.getText().toString();

117.

String
ReturnStr = WebServiceUtil

118.

.getCityListByProvince(Parame,

"1"

);

119.

//DialogUtil.showDialog(this,ReturnStr,
false);

120.

JSONArray
jsonArray;

121.

//
DialogUtil.showDialog(this,ReturnStr,false);

122.

if

(ReturnStr.contentEquals(

"anyType{}"

))
{

123.

jsonArray
=

new

JSONArray();

124.

}

else

{

125.

jsonArray
=

new

JSONArray(ReturnStr);

126.

}

127.

//
向指定URL发送请求，并把服务器响应转换成JSONArray对象

128.

129.

//
将JSONArray包装成Adapter

130.

List<Goods>
GoodsArry =

new

ArrayList<Goods>();

131.

132.

for

(

int

i
=

0

;
i<jsonArray.length();i++) {

133.

Goods
items =

new

Goods();

134.

items.setGds_Name(jsonArray.optJSONObject(i).getString(

135.

"GdsName"

));

136.

items.setGds_Code(jsonArray.optJSONObject(i).getString(

137.

"GdsCode"

));

138.

GoodsArry.add(items);

139.

}

140.

adapter
=

new

PaginationAdapter(GoodsArry);

141.

}

catch

(Exception
e) {

142.

//DialogUtil.showDialog(this,
e.getMessage(),false);

143.

e.printStackTrace();

144.

}

145.

146.

}

147.

148.

/**

149.

*
加载更多数据

150.

*/

151.

private

void

loadMoreData()
{

152.

int

count
= adapter.getCount();

153.

154.

try

{

155.

156.

String
Parame = SearcText.getText().toString();

157.

String
pageSize = String.valueOf(count /

10

+

1

);

158.

String
ReturnStr = WebServiceUtil.getCityListByProvince(Parame,

159.

pageSize);

160.

JSONArray
jsonArray;

161.

//
DialogUtil.showDialog(this,ReturnStr,false);

162.

if

(ReturnStr.contentEquals(

"anyType{}"

))
{

163.

jsonArray
=

new

JSONArray();

164.

}

else

{

165.

jsonArray
=

new

JSONArray(ReturnStr);

166.

}

167.

//
向指定URL发送请求，并把服务器响应转换成JSONArray对象

168.

169.

//
将JSONArray包装成Adapter

170.

for

(

int

i
=

1

;
jsonArray.length() <=

10

;
i++) {

171.

Goods
items =

new

Goods();

172.

items.setGds_Name(jsonArray.optJSONObject(i).getString(

173.

"GdsName"

));

174.

items.setGds_Code(jsonArray.optJSONObject(i).getString(

175.

"GdsCode"

));

176.

adapter.addNewsItem(items);

177.

}

178.

}

catch

(Exception
e) {

179.

//DialogUtil.showDialog(this,
e.getMessage(),false);

180.

e.printStackTrace();

181.

}

182.

183.

}

184.

185.

class

PaginationAdapter

extends

BaseAdapter
{

186.

187.

List<Goods>
newsItems;

188.

189.

public

PaginationAdapter(List<Goods>
newsitems) {

190.

this

.newsItems
= newsitems;

191.

}

192.

193.

@Override

194.

public

int

getCount()
{

195.

return

newsItems.size();

196.

}

197.

198.

@Override

199.

public

Object
getItem(

int

position)
{

200.

return

newsItems.get(position);

201.

}

202.

203.

@Override

204.

public

long

getItemId(

int

position)
{

205.

return

position;

206.

}

207.

208.

@Override

209.

public

View
getView(

int

position,
View view,ViewGroup parent) {

210.

if

(view
==

null

)
{

211.

view
= getLayoutInflater().inflate(R.layout.list_item,

null

);

212.

}

213.

214.

//
商品名称

215.

TextView
tvGdsName = (TextView) view.findViewById(R.id.Gds_Name);

216.

tvGdsName.setText(newsItems.get(position).getGds_Name());

217.

//
商品编码

218.

TextView
tvGdsCode = (TextView) view.findViewById(R.id.Gds_Code);

219.

tvGdsCode.setText(newsItems.get(position).getGds_Code());

220.

221.

return

view;

222.

}

223.

224.

/**

225.

*
添加数据列表项

226.

*

227.

*
@param newsitem

228.

*/

229.

public

void

addNewsItem(Goods
newsitem) {

230.

newsItems.add(newsitem);

231.

}

232.

233.

}

234.

235.

}