Android分页工具类的实现

我们在项目开发中，经常需要频繁的使用Android分页，所以有必要实现一个封装的类来统一管理实现。

首先看下效果图：

从上图我们可以看出，这里是将listview中的数据通过底下的分页工具实现分页显示。那我们接下来先贴出代码：

第一步：实现布局，这里有两个布局文件，第一个主布局文件main.xml

< RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android"
android:id = "@+id/whole_region"
android:layout_width = "fill_parent"
android:layout_height = "fill_parent"
android:orientation = "vertical" >

< HorizontalScrollView
android:id = "@+id/HorizontalScrollView01"
android:layout_width = "fill_parent"
android:layout_height = "wrap_content"
android:layout_above = "@+id/pagebtn"
android:layout_alignParentTop = "true" >

< LinearLayout
android:layout_width = "wrap_content"
android:layout_height = "fill_parent"
android:orientation = "vertical" >

< LinearLayout
android:id = "@+id/list_view_title"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:orientation = "horizontal" >
LinearLayout >

< ListView
android:id = "@+id/list"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:fadeScrollbars = "false" >
ListView >
LinearLayout >
HorizontalScrollView >

< LinearLayout
android:id = "@id/pagebtn"
android:layout_width = "fill_parent"
android:layout_height = "wrap_content"
android:layout_alignParentBottom = "true"
android:orientation = "vertical" >

< include layout = "@layout/pagebutton" />
LinearLayout >

RelativeLayout >

第二个布局文件pagebutton.xml.这个文件嵌套在第一个主文件中。

xml version = "1.0" encoding = "utf-8" ?>
< merge xmlns:android = "http://schemas.android.com/apk/res/android"
android:layout_width = "fill_parent"
android:layout_height = "fill_parent" >

< TableLayout
android:id = "@+id/TableLayout1"
android:layout_width = "fill_parent"
android:layout_height = "wrap_content"
android:paddingLeft = "5dip"
android:paddingRight = "5dip"
android:paddingTop = "5dip"
android:shrinkColumns = "0,1,2,3,4,5,6,7"
android:stretchColumns = "0,1,2,3,4,5,6,7" >

< TableRow >

< TextView
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text = "共"
android:textSize = "18sp" />

< TextView
android:id = "@+id/total_page_num"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:minWidth = "30dp"
android:textColor = "#C71585"
android:textSize = "18sp" />

< TextView
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text = "页"
android:textSize = "18sp" />

< TextView
android:id = "@+id/total_record_num"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:minWidth = "60dp"
android:textColor = "#C71585"
android:textSize = "18sp" />

< TextView
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text = "条，"
android:textSize = "18sp" />

< TextView
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text = "每页"
android:textSize = "18sp" />

< TextView
android:id = "@+id/record_num_each_page"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:textColor = "#C71585"
android:textSize = "18sp" />

< TextView
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text = "条"
android:textSize = "18sp" />
TableRow >
TableLayout >

< TableLayout
android:id = "@+id/TableLayout1"
android:layout_width = "fill_parent"
android:layout_height = "wrap_content"
android:paddingTop = "5dip"
android:shrinkColumns = "0,1,2,3,4,5,6,7,8"
android:stretchColumns = "0,1,2,3,4,5,6,7" >

< TableRow >

< Button
android:id = "@+id/first_page"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text = "|<"
android:textSize = "18sp" />

< Button
android:id = "@+id/page_up"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text = " < "
android:textSize = "18sp" />

< Button
android:id = "@+id/page_down"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text=" > "
android:textSize="18sp" />

< Button
android:id = "@+id/last_page"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text=">|"
android:textSize="18sp" />

< TextView
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text = "第"
android:textSize = "18sp" />

< EditText
android:id = "@+id/current_page"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:maxWidth = "40dip"
android:singleLine = "true"
android:textColor = "#C71585"
android:textSize = "18sp" />

< TextView
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text = "页"
android:textSize = "18sp" />

< Button
android:id = "@+id/to_page"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:text = "转到"
android:textSize = "18sp" />
TableRow >
TableLayout >

merge >

第二步：新建一个activity,用来显示界面

public class BuilderList1 extends QueryContextActivity {
private PagedQueryResultHelper pagedQueryResultHelper;
private Map params;
private ListView list;
private List columnWidths;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super .onCreate(savedInstanceState);
setContentView(R.layout.mynotifylist);
setOnClickListener();

columnWidths = new ArrayList();
int weight = this .getWindowManager().getDefaultDisplay().getWidth();
columnWidths.add(weight);

pagedQueryResultHelper = new PagedQueryResultHelper( this );
pagedQueryResultHelper.setTitleCellWidth(columnWidths);

// 这个方法是用来查询数据并显示在LISTVIEW中的，我们这次的重点不在这里，我只列出不详讲，有兴趣的朋友可以自己研究下listview
// query();

}

protected void query() {
params = new HashMap();
params.put( "userName" , UserInfo.getUserName());
pagedQueryResultHelper.setQueryParams( "getBuilderList" , params,
"startNum" , "endNum" , "MyNotifyList" , R.array.build_list_name,
R.array.build_list);
if (pagedQueryResultHelper.initialQuery() == null ) {
new AlertDialog.Builder( this )
.setTitle(R.string.message_title)
.setMessage( "没有查询到相关信息，请返回！" )
.setPositiveButton(R.string.OK_text, null )
.setPositiveButton(R.string.OK_text,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
BuilderList1. this .finish();
}
}).show();
}
;
list = (ListView) findViewById(R.id.list);
list.setOnItemClickListener( new OnItemClickListener() {
@Override
public void onItemClick(AdapterView adapterView, View view,
int index, long arg3) {
List> data = pagedQueryResultHelper
.getWholeResult();
Intent intent = new Intent(BuilderList1. this , FloorInfo. class );
intent.putExtra( "value" , (Serializable) data.get(index));
intent.putExtra( "buildid" , data.get(index).get( "BUILDID" )
.toString());
startActivity(intent);
}
});
}

@Override
public void onClick(View arg0) {
switch (arg0.getId()) {
case R.id.first_page:
pagedQueryResultHelper.firstPage();
break ;
case R.id.page_down:
pagedQueryResultHelper.pageDown();
break ;
case R.id.page_up:
pagedQueryResultHelper.pageUp();
break ;
case R.id.last_page:
pagedQueryResultHelper.lastPage();
break ;
case R.id.to_page:
pagedQueryResultHelper.toPage();
break ;
}
}

@Override
protected void clear() {
}

@Override
protected void setOnClickListener() {
}
}

第三步：实现这个工具类，这个类代码有些多

package org.Base.Utils;

import java.util.Arrays;
import java.util.List;
import java.util.Map;

import org.Base.Activities.QueryContextActivity;
import org.Base.Container.DataTableAdapter;
import org.Base.Container.myListViewTitle;
import org.Base.Webservice.WSObjectListUtil;
import org.Base.Webservice.WSObjectMapUtil;
import org.Base.Webservice.WSObjectUtil;
import org.Base.Webservice.WSUtil;
import org.Base.Webservice.WebServiceConfig;
import org.DigitalCM.R;
import org.ksoap2.serialization.SoapObject;

import android.app.AlertDialog;
import android.util.Log;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;

public class PagedQueryResultHelper {
private final static int initialFromRecordNum = 1 ; // 每页从第1条开始
private final static int initialToRecordNum = 20 ; // 每页可以显示20条

public PagedQueryResultHelper(QueryContextActivity contextActivity) { // 构造函数用来初始化，主要是用来接收传过来的activity做为上下文对象
this .contextActivity = contextActivity;

findViews(); // 调用此方法找到传过来的activity的控件对象
setOnClickListener(); // 给控件设置监听
if (currentPageText != null ) { // 如果所有页面只有一页，那就只显示一页
setCurrentPage( 1 );
}
}

public List> initialQuery() {
setRecordNumEachPage(initialToRecordNum - initialFromRecordNum + 1 ); // 设置每页的记录条数
return query(initialFromRecordNum, initialToRecordNum);

}

public List> initialQuery01() {
return query(methodName, params);
}

private void setCurrentPage( int currentPage) { // 设置当前页
this .currentPage = currentPage;
currentPageText.setText(String.valueOf(currentPage));
}

public void setMarkable( boolean bMarkable) { // 这个是用来标记记录的
this .bMarkable = bMarkable;
}

public void setRecordNumEachPage( int recordNumEachPage) {); //设置每页的记录条数
this .recordNumEachPage = recordNumEachPage;
recordNumEachPageText.setText(String.valueOf(recordNumEachPage));
}

public void setTotalRecord( int totalRecord) { // 设置总记录数
this .totalRecord = totalRecord;
totalRecordNumText.setText(String.valueOf(totalRecord));
getTotalPageNumText();
}

private QueryContextActivity contextActivity;
private TextView totalPageNumText;
private TextView totalRecordNumText;
private TextView recordNumEachPageText;
private Button firstPage;
private Button pageDown;
private Button pageUp;
private Button lastPage;
private EditText currentPageText;
private Button toPage;

private int totalPage;
private int totalRecord;
private int recordNumEachPage;
private int currentPage;
private String fromRecordNumField;
private String toRecordNumField;
private String methodName;
private Map params;
private String contentTableName;
// private String countTableName;
private int headerNameId;
private int headerId;
private List columnWidths = null ;
private boolean bSetTitleValue = false ;
private List> wholeresult = null ;
private List> rows = null ;
private boolean bMarkable = false ;
private DataTableAdapter dataTableAdapter;

public void setQueryParams(String methodName, Map params,
String fromRecordNumField, String toRecordNumField,
String contentTableName, int headerNameId, int headerId) {
this .methodName = methodName;
this .params = params;
this .fromRecordNumField = fromRecordNumField;
this .toRecordNumField = toRecordNumField;
this .contentTableName = contentTableName;
// this.countTableName = countTableName;
this .headerNameId = headerNameId;
this .headerId = headerId;
}

public void setQueryParams(String methodName, Map params,
String fromRecordNumField, String toRecordNumField,
String contentTableName) {
this .methodName = methodName;
this .params = params;
this .fromRecordNumField = fromRecordNumField;
this .toRecordNumField = toRecordNumField;
this .contentTableName = contentTableName;
// this.countTableName = countTableName;

}

public void setQueryParams(String methodName, Map params,
String contentTableName, int headerNameId, int headerId) {
this .methodName = methodName;
this .params = params;

this .contentTableName = contentTableName;

this .headerNameId = headerNameId;
this .headerId = headerId;

}

public void setTitleCellWidth(List columnWidths) {
this .columnWidths = columnWidths;
}

/*
* public int getCurrentPage(){ return currentPage; }
*/

private void findViews() {
totalPageNumText = (TextView) contextActivity
.findViewById(R.id.total_page_num);
totalRecordNumText = (TextView) contextActivity
.findViewById(R.id.total_record_num);
recordNumEachPageText = (TextView) contextActivity
.findViewById(R.id.record_num_each_page);
firstPage = (Button) contextActivity.findViewById(R.id.first_page);
pageDown = (Button) contextActivity.findViewById(R.id.page_down);
pageUp = (Button) contextActivity.findViewById(R.id.page_up);
lastPage = (Button) contextActivity.findViewById(R.id.last_page);
currentPageText = (EditText) contextActivity
.findViewById(R.id.current_page);
toPage = (Button) contextActivity.findViewById(R.id.to_page);
}

private void setOnClickListener() {
if (firstPage != null ) {
firstPage.setOnClickListener(contextActivity);
}
if (pageDown != null ) {
pageDown.setOnClickListener(contextActivity);
}
if (pageUp != null ) {
pageUp.setOnClickListener(contextActivity);
}
if (lastPage != null ) {
lastPage.setOnClickListener(contextActivity);
}
if (toPage != null ) {
toPage.setOnClickListener(contextActivity);
}
}

private void getRecordNumEachPageText() {
try {
recordNumEachPage = Integer.parseInt(recordNumEachPageText
.getText().toString());
} catch (NumberFormatException e) {
Log.e( "NumberFormatException" , e.getMessage());
}
}

private boolean outOfEachPageRange() {
recordNumEachPage = Integer.parseInt(recordNumEachPageText.getText()
.toString());
if (recordNumEachPage > 20 || recordNumEachPage < 1 ) {
return true ;
}
return false ;
}

private void getTotalPageNumText() {
getRecordNumEachPageText();
if (recordNumEachPage == 0 )
return ;
if (totalRecord == 0 ) {
totalPage = 0 ;
totalPageNumText.setText(String.valueOf( 0 ));
return ;
}
if (totalRecord % recordNumEachPage == 0 ) { // java中分页常用到的计算公式
totalPage = totalRecord / recordNumEachPage;
} else {
totalPage = totalRecord / recordNumEachPage + 1 ;
}
totalPageNumText.setText(String.valueOf(totalPage));
}

public void pageDown() {
if (outOfEachPageRange()) {
AlertDialog.Builder dialog = new AlertDialog.Builder(
contextActivity);
dialog.setTitle( "提示：" ).setMessage( "每页显示条数在1~20之间！" )
.setPositiveButton( "确认" , null ).show();
return ;
}
if (currentPage != totalPage) {
setCurrentPage(++currentPage);
getTotalPageNumText();
query(recordNumEachPage * (currentPage - 1 ) + 1 , recordNumEachPage
* currentPage);
}
}

public void pageUp() {
if (outOfEachPageRange()) {
AlertDialog.Builder dialog = new AlertDialog.Builder(
contextActivity);
dialog.setTitle( "提示：" ).setMessage( "每页显示条数在1~20之间！" )
.setPositiveButton( "确认" , null ).show();
return ;
}
if (currentPage != 1 && currentPage != 0 ) {
setCurrentPage(--currentPage);
getTotalPageNumText();
query(recordNumEachPage * (currentPage - 1 ) + 1 , recordNumEachPage
* currentPage);
}
}

public void firstPage() {
if (outOfEachPageRange()) {
AlertDialog.Builder dialog = new AlertDialog.Builder(
contextActivity);
dialog.setTitle( "提示：" ).setMessage( "每页显示条数在1~20之间！" )
.setPositiveButton( "确认" , null ).show();
return ;
}
getTotalPageNumText();
if (totalPage > 1 ) {
setCurrentPage( 1 );
query( 1 , recordNumEachPage);
}
}

public void lastPage() {
if (outOfEachPageRange()) {
AlertDialog.Builder dialog = new AlertDialog.Builder(
contextActivity);
dialog.setTitle( "提示：" ).setMessage( "每页显示条数在1~20之间！" )
.setPositiveButton( "确认" , null ).show();
return ;
}
getTotalPageNumText();
if (totalPage != 1 && totalPage != 0 ) {
setCurrentPage(totalPage);
query(recordNumEachPage * (totalPage - 1 ) + 1 , totalRecord);
}
}

public void toPage() {
if (outOfEachPageRange()) {
AlertDialog.Builder dialog = new AlertDialog.Builder(
contextActivity);
dialog.setTitle( "提示：" ).setMessage( "每页显示条数在1~20之间！" )
.setPositiveButton( "确认" , null ).show();
return ;
}
try {
currentPage = Integer
.parseInt(currentPageText.getText().toString());
} catch (NumberFormatException e) {
Log.e( "NumberFormatException" , e.getMessage());
return ;
}
getTotalPageNumText();
query(recordNumEachPage * (currentPage - 1 ) + 1 , recordNumEachPage
* currentPage);
currentPageText.setText(String.valueOf(currentPage));
}

public List> query( int fromRecordNum, int toRecordNum) {
return query(methodName, params, fromRecordNumField, toRecordNumField,
fromRecordNum, toRecordNum);
}

private List> query(String methodName,
Map params, String fromRecordNumField,
String toRecordNumField, int fromRecordNum, int toRecordNum) {
params.put(fromRecordNumField, fromRecordNum);
params.put(toRecordNumField, toRecordNum);

return query(methodName, params);
}

public List> getWholeResult() {
return wholeresult;
}

public List> getResult() {
return wholeresult;
}

public List getCheckBoxState() {
return dataTableAdapter.getCheckBoxState();
}

public List> query(String methodName,
Map params) { // 此方法要重点注意，因为这里是根据webservice查询到的数据，所以要传递来方法和参数
SoapObject result = null ;

if (methodName == null ) {
if (bSetTitleValue == false ) { // 下面是实现listview的标题显示
bSetTitleValue = true ;
myListViewTitle listViewTitle = new myListViewTitle(
contextActivity);
if ( this .columnWidths != null ) {
listViewTitle.setTitleCellWidth( this .columnWidths);
}
List headerList = Arrays.asList(contextActivity
.getResources().getStringArray(headerId));
listViewTitle.setTitleCellValue(headerList);
}
return null ;
}

try {
result = WSUtil.getSoapObjectByCallingWS(
// 这里是android调用webservice的典型方法
WebServiceConfig.NAMESPACE, methodName, params,
WebServiceConfig.wsdl);
} catch (Exception e) {
new AlertDialog.Builder(contextActivity)
.setTitle(R.string.message_title)
.setMessage(R.string.connection_error)
.setPositiveButton(R.string.OK_text, null ).show();
Log.e( "Exception" , e.getMessage());
}

if (result == null ) { // 如果从webservice得到的结果为null，那我们就找到listview，并赋空值，将分页的显示值设为0
ListView list = (ListView) contextActivity.findViewById(R.id.list);
list.setAdapter( null );
setTotalRecord( 0 );
this .setCurrentPage( 0 );
return null ;
}

SoapObject dataSet = WSObjectUtil.getDataSetObject(result); // 如果从webservice得到的结果不为空，则转化成dataSet
if (dataSet == null ) { // 如果dataSet为空，则显示对话框，没有查询到相关数据

new AlertDialog.Builder(contextActivity)
.setTitle(R.string.message_title).setMessage( "没有查询到相关数据！" )
.setPositiveButton(R.string.OK_text, null );

return null ;
}

// 否则，就取得列名，并将取得的dataset转化成list型的数据，最后将数据显示在listview,并通过rows返回数据

List columnNameList = Arrays.asList(contextActivity
.getResources().getStringArray(headerNameId));
WSObjectListUtil wsObjectListUtil = new WSObjectListUtil();
if (contentTableName != null ) {
rows = wsObjectListUtil.getTableValueList(dataSet,
contentTableName, columnNameList);
} else {
rows = wsObjectListUtil.getTableValueList(dataSet, columnNameList);
}
if (wholeresult != null ) {
wholeresult.clear();
}
WSObjectMapUtil wsObjectMapUtil = new WSObjectMapUtil();
if (contentTableName != null ) {
wholeresult = wsObjectMapUtil.getRowMapList(contentTableName,
dataSet);
} else {
wholeresult = WSObjectMapUtil.getRowMapList(dataSet);
}
SoapObject countTable = (SoapObject) dataSet.getProperty(dataSet
.getPropertyCount() - 1 );
try {
totalRecord = Integer
.parseInt(countTable.getProperty( 0 ).toString());
} catch (Exception e) {
Log.e( "Exception" , e.getMessage());
}
if (totalRecord != 0 && this .totalRecord == 0
&& currentPageText != null ) {
this .setCurrentPage( 1 );
}
setTotalRecord(totalRecord);

if (bSetTitleValue == false ) {
bSetTitleValue = true ;
myListViewTitle listViewTitle = new myListViewTitle(contextActivity);
if ( this .columnWidths != null ) {
listViewTitle.setTitleCellWidth( this .columnWidths);
}
List headerList = Arrays.asList(contextActivity
.getResources().getStringArray(headerId));
listViewTitle.setTitleCellValue(headerList);
}

ListView list = (ListView) contextActivity.findViewById(R.id.list);
dataTableAdapter = new DataTableAdapter(contextActivity, rows);
if (bMarkable) {
dataTableAdapter.setMarkable( true );
}
if ( this .columnWidths != null ) {
dataTableAdapter.setColumnWidths( this .columnWidths);
}
list.setAdapter(dataTableAdapter); // 注意，关键点：将数据显示在listview

return rows; // 返回数据
}
}