android分页查询功能工具类的实现

本文转载自查看原文 2012-02-25 19:15 4322 手机开发

在一个项目中，常常需要频繁的分页，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：

1、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。

< pre class ="html" name ="code" > <? 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:stretchColumns ="0,1,2,3,4,5,6,7" android:shrinkColumns ="0,1,2,3,4,5,6,7"
        android:paddingTop ="5dip" android:paddingLeft ="5dip" android:paddingRight ="5dip" >
         < TableRow >
             < TextView android:text ="共" android:layout_width ="wrap_content"
                android:layout_height ="wrap_content" android:textSize ="18sp" />
             < TextView android:id ="@+id/total_page_num" android:minWidth ="30dp"
                android:layout_width ="wrap_content" android:layout_height ="wrap_content"
                android:textColor ="#C71585"
                android:textSize ="18sp" />
             < TextView android:text ="页" android:layout_width ="wrap_content"
                android:layout_height ="wrap_content" android:textSize ="18sp" />
             < TextView android:id ="@+id/total_record_num"
                android:minWidth ="60dp" android:layout_width ="wrap_content"
                android:layout_height ="wrap_content" android:textColor ="#C71585" android:textSize ="18sp" />
             < TextView android:text ="条，" android:layout_width ="wrap_content"
                android:layout_height ="wrap_content" android:textSize ="18sp" />
             < TextView android:text ="每页" android:layout_width ="wrap_content"
                android:layout_height ="wrap_content" 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:text ="条" android:layout_width ="wrap_content"
                android:layout_height ="wrap_content" android:textSize ="18sp" />
         </ TableRow >
     </ TableLayout >
     < TableLayout android:id ="@+id/TableLayout1"
        android:layout_width ="fill_parent" android:layout_height ="wrap_content"
        android:stretchColumns ="0,1,2,3,4,5,6,7" android:shrinkColumns ="0,1,2,3,4,5,6,7,8" android:paddingTop ="5dip" >
         < TableRow >
             < Button android:id ="@+id/first_page" android:text ="|<"
                android:layout_width ="wrap_content" android:layout_height ="wrap_content"
                android:textSize ="18sp" />
             < Button android:id ="@+id/page_up" android:text =" < "
                android:layout_width ="wrap_content" android:layout_height ="wrap_content"
                android:textSize ="18sp" />
             < Button android:id ="@+id/page_down" android:text =" > "
                android:layout_width ="wrap_content" android:layout_height ="wrap_content"
                android:textSize ="18sp" />
             < Button android:id ="@+id/last_page" android:text =">|"
                android:layout_width ="wrap_content" android:layout_height ="wrap_content"
                android:textSize ="18sp" />
             < TextView android:text ="第" android:layout_width ="wrap_content"
                android:layout_height ="wrap_content" android:textSize ="18sp" />
             < EditText android:id ="@+id/current_page" android:maxWidth ="40dip"
                android:singleLine ="true" android:layout_width ="wrap_content"
                android:layout_height ="wrap_content"   android:textColor ="#C71585" android:textSize ="18sp" />
             < TextView android:text ="页" android:layout_width ="wrap_content"
                android:layout_height ="wrap_content" android:textSize ="18sp" />
             < Button android:id ="@+id/to_page" android:text ="转到"
                android:layout_width ="wrap_content" android:layout_height ="wrap_content"
                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<String, Object> params;
     private ListView list;
     private List<Integer> columnWidths;

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


        columnWidths = new ArrayList<Integer>();
         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();

}

    <p>         protected void query() {
                params = new HashMap<String, Object>();
                params.put("userName", UserInfo.getUserName());</p><p>                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) {</p><p>                            BuilderList1. this.finish();</p><p>                     } }).show();
  };</p><p>             list = (ListView) findViewById(R.id.list);</p><p>             list.setOnItemClickListener( new OnItemClickListener() {
             @Override
             public void onItemClick(AdapterView<?> adapterView, View view, int index, long arg3) {</p><p>                  List<Map<String, Object>> 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); }});
}</p><p>             @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;
        }
    }</p><p>        @Override
               protected void clear() {
   }</p><p>       @Override
     protected void setOnClickListener() {
   }</p><p>}</p><p> </p>第三步：实现这个工具类，这个类代码有些多

<pre class="java" name="code"> 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<List<String>> initialQuery() {
        setRecordNumEachPage(initialToRecordNum - initialFromRecordNum + 1); // 设置每页的记录条数
         return query(initialFromRecordNum, initialToRecordNum);

    }

     public List<List<String>> 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<String, Object> params;
     private String contentTableName;
     // private String countTableName;
     private int headerNameId;
     private int headerId;
     private List<Integer> columnWidths = null;
     private boolean bSetTitleValue = false;
     private List<Map<String, Object>> wholeresult = null;
     private List<List<String>> rows = null;
     private boolean bMarkable = false;
     private DataTableAdapter dataTableAdapter;

     public void setQueryParams(String methodName, Map<String, Object> 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<String, Object> 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<String, Object> 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<Integer> 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<List<String>> query( int fromRecordNum, int toRecordNum) {
         return query(methodName, params, fromRecordNumField, toRecordNumField,
                fromRecordNum, toRecordNum);
    }

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

         return query(methodName, params);
    }

     public List<Map<String, Object>> getWholeResult() {
         return wholeresult;
    }

     public List<Map<String, Object>> getResult() {
         return wholeresult;
    }

     public List<Boolean> getCheckBoxState() {
         return dataTableAdapter.getCheckBoxState();
    }

     public List<List<String>> query(String methodName,
            Map<String, Object> 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<String> 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<String> 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<String> 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
    }
}

好的，这个工具类基本就实现了。大家也可以自己添加一些元素完善。

url: http://greatverve.cnblogs.com/archive/2012/02/24/android-pager.html

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