Android提高第九篇之SQLite分页表格

上次讲的Android上的 SQLite分页读取 ，只用文本框显示数据而已，这次就讲得更加深入些，实现并封装一个SQL分页表格控件，不仅支持分页还是以表格的形式展示数据。 先来看看本文程序运行的动画：

       这个SQL分页表格控件主要分为“表格区”和“分页栏”这两部分，这两部分都是基于GridView实现的。网上介绍Android上实现表格的DEMO 一般都用ListView。ListView与GridView对比，ListView最大的优势是格单元的大小可以自定义，可以某单元长某单元短，但是 难于实现自适应数据表的结构；而GridView最大的优势就是自适应数据表的结构，但是格单元统一大小。。。对于数据表结构多变的情况，建议使用 GridView实现表格。

本文实现的SQL分页表格控件有以下特点：

1.自适应数据表结构，但是格单元统一大小；

2.支持分页；

3.“表格区”有按键事件回调处理，“分页栏”有分页切换事件回调处理。

本文程序代码较多，可以到这里下载整个工程的源码：http://www.rayfile.com/files/72e78b68-f2e5-11df-8469-0015c55db73d/

items.xml的代码如下，它是“表格区”和“分页栏”的格单元实现：

 <? xml   version = "1.0"   encoding = "utf-8" ?>
 < LinearLayout   android:id = "@+id/LinearLayout01"
     xmlns:android = "http://schemas.android.com/apk/res/android"
     android:layout_width = "fill_parent"   android:background = "#555555"
     android:layout_height = "wrap_content" >
     < TextView   android:layout_below = "@+id/ItemImage"   android:text = "TextView01"
         android:id = "@+id/ItemText"   android:bufferType = "normal"
         android:singleLine = "true"   android:background = "#000000"
         android:layout_width = "fill_parent"   android:gravity = "center"
         android:layout_margin = "1dip"   android:layout_gravity = "center"
         android:layout_height = "wrap_content" >
     </ TextView >
 </ LinearLayout >

<?xml version="1.0" encoding="utf-8"?> <LinearLayout android:id="@+id/LinearLayout01" xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:background="#555555" android:layout_height="wrap_content"> <TextView android:layout_below="@+id/ItemImage" android:text="TextView01" android:id="@+id/ItemText" android:bufferType="normal" android:singleLine="true" android:background="#000000" android:layout_width="fill_parent" android:gravity="center" android:layout_margin="1dip" android:layout_gravity="center" android:layout_height="wrap_content"> </TextView> </LinearLayout>

main.xml的代码如下：

 <? 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"   android:id = "@+id/MainLinearLayout" >
     < Button   android:layout_height = "wrap_content"
         android:layout_width = "fill_parent"   android:id = "@+id/btnCreateDB"
         android:text = "创建数据库" > </ Button >
     < Button   android:layout_height = "wrap_content"
         android:layout_width = "fill_parent"   android:text = "插入一串实验数据"   android:id = "@+id/btnInsertRec" > </ Button >
     < Button   android:layout_height = "wrap_content"   android:id = "@+id/btnClose"
         android:text = "关闭数据库"   android:layout_width = "fill_parent" > </ Button >
 </ LinearLayout >

<?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" android:id="@+id/MainLinearLayout"> <Button android:layout_height="wrap_content" android:layout_width="fill_parent" android:id="@+id/btnCreateDB" android:text="创建数据库"></Button> <Button android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="插入一串实验数据" android:id="@+id/btnInsertRec"></Button> <Button android:layout_height="wrap_content" android:id="@+id/btnClose" android:text="关闭数据库" android:layout_width="fill_parent"></Button> </LinearLayout>

演示程序testSQLite.java的源码：

 package  com.testSQLite;
 import  android.app.Activity;
 import  android.database.Cursor;
 import  android.database.SQLException;
 import  android.database.sqlite.SQLiteDatabase;
 import  android.os.Bundle;
 import  android.util.Log;
 import  android.view.View;
 import  android.widget.Button;
 import  android.widget.LinearLayout;
 import  android.widget.Toast;
 public   class  testSQLite  extends  Activity {
     GVTable table;
     Button btnCreateDB, btnInsert, btnClose;
     SQLiteDatabase db;
     int  id; //添加记录时的id累加标记，必须全局
     private   static   final  String TABLE_NAME =  "stu" ;
     private   static   final  String ID =  "id" ;
     private   static   final  String NAME =  "name" ;
     private   static   final  String PHONE =  "phone" ;
     private   static   final  String ADDRESS =  "address" ;
     private   static   final  String AGE =  "age" ;

     @Override
     public   void  onCreate(Bundle savedInstanceState) {
         super .onCreate(savedInstanceState);
         setContentView(R.layout.main);
         btnCreateDB = (Button) this .findViewById(R.id.btnCreateDB);
         btnCreateDB.setOnClickListener(new  ClickEvent());
         btnInsert = (Button) this .findViewById(R.id.btnInsertRec);
         btnInsert.setOnClickListener(new  ClickEvent());
         btnClose = (Button) this .findViewById(R.id.btnClose);
         btnClose.setOnClickListener(new  ClickEvent());
         table=new  GVTable( this );
         table.gvSetTableRowCount(8 ); //设置每个分页的ROW总数
         LinearLayout ly = (LinearLayout) findViewById(R.id.MainLinearLayout);
         table.setTableOnClickListener(new  GVTable.OnTableClickListener() {
             @Override
             public   void  onTableClickListener( int  x, int  y,Cursor c) {
                 c.moveToPosition(y);
                 String str=c.getString(x)+" 位置:(" +String.valueOf(x)+ "," +String.valueOf(y)+ ")" ;
                 Toast.makeText(testSQLite.this , str,  1000 ).show();
             }
         });
         table.setOnPageSwitchListener(new  GVTable.OnPageSwitchListener() {

             @Override
             public   void  onPageSwitchListener( int  pageID, int  pageCount) {
                 String str="共有" +String.valueOf(pageCount)+
                 " 当前第" +String.valueOf(pageID)+ "页" ;
                 Toast.makeText(testSQLite.this , str,  1000 ).show();
             }
         });

         ly.addView(table);
     }
     class  ClickEvent  implements  View.OnClickListener {
         @Override
         public   void  onClick(View v) {
             if  (v == btnCreateDB) {
                 CreateDB();
             } else   if  (v == btnInsert) {
                 InsertRecord(16 ); //插入16条记录
                 table.gvUpdatePageBar("select count(*) from "  + TABLE_NAME,db);
                 table.gvReadyTable("select * from "  + TABLE_NAME,db);
             }else   if  (v == btnClose) {
                 table.gvRemoveAll();
                 db.close();

             }
         }
     }

     /**
      * 在内存创建数据库和数据表
      */
     void  CreateDB() {
         // 在内存创建数据库
         db = SQLiteDatabase.create(null );
         Log.e("DB Path" , db.getPath());
         String amount = String.valueOf(databaseList().length);
         Log.e("DB amount" , amount);
         // 创建数据表
         String sql = "CREATE TABLE "  + TABLE_NAME +  " ("  +
                 ID  + " text not null, "  + NAME +  " text not null,"  +
                 ADDRESS + " text not null, "  + PHONE +  " text not null,"  +
                 AGE + " text not null " + ");" ;
         try  {
             db.execSQL("DROP TABLE IF EXISTS "  + TABLE_NAME);
             db.execSQL(sql);
         } catch  (SQLException e) {}
     }
     /**
      * 插入N条数据
      */
     void  InsertRecord( int  n) {
         int  total = id + n;
         for  (; id < total; id++) {
             String sql = "insert into "  + TABLE_NAME +  " ("  +
             ID + ", "  + NAME+ ", "  + ADDRESS+ ", "  + PHONE+ ", " +AGE
                     + ") values('"  + String.valueOf(id) +  "', 'man','address','123456789','18');" ;
             try  {
                 db.execSQL(sql);
             } catch  (SQLException e) {
             }
         }
     }


 }

package com.testSQLite; import android.app.Activity; import android.database.Cursor; import android.database.SQLException; import android.database.sqlite.SQLiteDatabase; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.LinearLayout; import android.widget.Toast; public class testSQLite extends Activity { GVTable table; Button btnCreateDB, btnInsert, btnClose; SQLiteDatabase db; int id;//添加记录时的id累加标记，必须全局 private static final String TABLE_NAME = "stu"; private static final String ID = "id"; private static final String NAME = "name"; private static final String PHONE = "phone"; private static final String ADDRESS = "address"; private static final String AGE = "age"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); btnCreateDB = (Button) this.findViewById(R.id.btnCreateDB); btnCreateDB.setOnClickListener(new ClickEvent()); btnInsert = (Button) this.findViewById(R.id.btnInsertRec); btnInsert.setOnClickListener(new ClickEvent()); btnClose = (Button) this.findViewById(R.id.btnClose); btnClose.setOnClickListener(new ClickEvent()); table=new GVTable(this); table.gvSetTableRowCount(8);//设置每个分页的ROW总数 LinearLayout ly = (LinearLayout) findViewById(R.id.MainLinearLayout); table.setTableOnClickListener(new GVTable.OnTableClickListener() { @Override public void onTableClickListener(int x,int y,Cursor c) { c.moveToPosition(y); String str=c.getString(x)+" 位置:("+String.valueOf(x)+","+String.valueOf(y)+")"; Toast.makeText(testSQLite.this, str, 1000).show(); } }); table.setOnPageSwitchListener(new GVTable.OnPageSwitchListener() { @Override public void onPageSwitchListener(int pageID,int pageCount) { String str="共有"+String.valueOf(pageCount)+ " 当前第"+String.valueOf(pageID)+"页"; Toast.makeText(testSQLite.this, str, 1000).show(); } }); ly.addView(table); } class ClickEvent implements View.OnClickListener { @Override public void onClick(View v) { if (v == btnCreateDB) { CreateDB(); } else if (v == btnInsert) { InsertRecord(16);//插入16条记录 table.gvUpdatePageBar("select count(*) from " + TABLE_NAME,db); table.gvReadyTable("select * from " + TABLE_NAME,db); }else if (v == btnClose) { table.gvRemoveAll(); db.close(); } } } /** * 在内存创建数据库和数据表 */ void CreateDB() { // 在内存创建数据库 db = SQLiteDatabase.create(null); Log.e("DB Path", db.getPath()); String amount = String.valueOf(databaseList().length); Log.e("DB amount", amount); // 创建数据表 String sql = "CREATE TABLE " + TABLE_NAME + " (" + ID + " text not null, " + NAME + " text not null," + ADDRESS + " text not null, " + PHONE + " text not null," + AGE + " text not null "+");"; try { db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME); db.execSQL(sql); } catch (SQLException e) {} } /** * 插入N条数据 */ void InsertRecord(int n) { int total = id + n; for (; id < total; id++) { String sql = "insert into " + TABLE_NAME + " (" + ID + ", " + NAME+", " + ADDRESS+", " + PHONE+", "+AGE + ") values('" + String.valueOf(id) + "', 'man','address','123456789','18');"; try { db.execSQL(sql); } catch (SQLException e) { } } } }

分页表格控件GVTable.java的源码：

 package  com.testSQLite;
 import  java.util.ArrayList;
 import  java.util.HashMap;
 import  android.content.Context;
 import  android.database.Cursor;
 import  android.database.sqlite.SQLiteDatabase;
 import  android.view.View;
 import  android.widget.AdapterView;
 import  android.widget.GridView;
 import  android.widget.LinearLayout;
 import  android.widget.SimpleAdapter;
 import  android.widget.AdapterView.OnItemClickListener;
 public   class  GVTable  extends  LinearLayout {
     protected  GridView gvTable,gvPage;
     protected  SimpleAdapter saPageID,saTable; // 适配器
     protected  ArrayList<HashMap<String, String>> srcPageID,srcTable; // 数据源

     protected   int  TableRowCount= 10 ; //分页时，每页的Row总数
     protected   int  TableColCount= 0 ; //每页col的数量
     protected  SQLiteDatabase db;
     protected  String rawSQL= "" ;
     protected  Cursor curTable; //分页时使用的Cursor
     protected  OnTableClickListener clickListener; //整个分页控件被点击时的回调函数
     protected  OnPageSwitchListener switchListener; //分页切换时的回调函数

     public  GVTable(Context context) {
         super (context);
         this .setOrientation(VERTICAL); //垂直
         //----------------------------------------
         gvTable=new  GridView(context);
         addView(gvTable, new  LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
                 LayoutParams.WRAP_CONTENT));//宽长式样

         srcTable = new  ArrayList<HashMap<String, String>>();
         saTable = new  SimpleAdapter(context,
                 srcTable,// 数据来源
                 R.layout.items,//XML实现
                 new  String[] {  "ItemText"  }, // 动态数组与ImageItem对应的子项
                 new   int [] { R.id.ItemText });
         // 添加并且显示
         gvTable.setAdapter(saTable);
         gvTable.setOnItemClickListener(new  OnItemClickListener(){
             @Override
             public   void  onItemClick(AdapterView<?> arg0, View arg1,  int  arg2,
                     long  arg3) {
                 int  y=arg2/curTable.getColumnCount()- 1 ; //标题栏的不算
                 int  x=arg2 % curTable.getColumnCount();
                 if  (clickListener !=  null //分页数据被点击
                         && y!=-1 ) { //点中的不是标题栏时
                     clickListener.onTableClickListener(x,y,curTable);
                 }
             }
         });

         //----------------------------------------
         gvPage=new  GridView(context);
         gvPage.setColumnWidth(40 ); //设置每个分页按钮的宽度
         gvPage.setNumColumns(GridView.AUTO_FIT);//分页按钮数量自动设置
         addView(gvPage, new  LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
                 LayoutParams.WRAP_CONTENT));//宽长式样
         srcPageID = new  ArrayList<HashMap<String, String>>();
         saPageID = new  SimpleAdapter(context,
                 srcPageID,// 数据来源
                 R.layout.items,//XML实现
                 new  String[] {  "ItemText"  }, // 动态数组与ImageItem对应的子项
                 new   int [] { R.id.ItemText });
         // 添加并且显示
         gvPage.setAdapter(saPageID);
         // 添加消息处理
         gvPage.setOnItemClickListener(new  OnItemClickListener(){
             @Override
             public   void  onItemClick(AdapterView<?> arg0, View arg1,  int  arg2,
                     long  arg3) {
                 LoadTable(arg2);//根据所选分页读取对应的数据
                 if (switchListener!= null ){ //分页切换时
                     switchListener.onPageSwitchListener(arg2,srcPageID.size());
                 }
             }
         });
     }
     /**
      * 清除所有数据
      */
     public   void  gvRemoveAll()
     {
         if ( this .curTable!= null )
             curTable.close();
         srcTable.clear();
         saTable.notifyDataSetChanged();

         srcPageID.clear();
         saPageID.notifyDataSetChanged();

     }
     /**
      * 读取指定ID的分页数据,返回当前页的总数据
      * SQL:Select * From TABLE_NAME Limit 9 Offset 10;
      * 表示从TABLE_NAME表获取数据，跳过10行，取9行
      * @param pageID 指定的分页ID
      */
     protected   void  LoadTable( int  pageID)
     {
         if (curTable!= null ) //释放上次的数据
             curTable.close();

         String sql= rawSQL+" Limit " +String.valueOf(TableRowCount)+  " Offset "  +String.valueOf(pageID*TableRowCount);
         curTable = db.rawQuery(sql, null );

         gvTable.setNumColumns(curTable.getColumnCount());//表现为表格的关键点！
         TableColCount=curTable.getColumnCount();
         srcTable.clear();
         // 取得字段名称
         int  colCount = curTable.getColumnCount();
         for  ( int  i =  0 ; i < colCount; i++) {
             HashMap<String, String> map = new  HashMap<String, String>();
             map.put("ItemText" , curTable.getColumnName(i));
             srcTable.add(map);
         }

         // 列举出所有数据
         int  recCount=curTable.getCount();
         for  ( int  i =  0 ; i < recCount; i++) { //定位到一条数据
             curTable.moveToPosition(i);
             for ( int  ii= 0 ;ii<colCount;ii++) //定位到一条数据中的每个字段
             {
                 HashMap<String, String> map = new  HashMap<String, String>();
                 map.put("ItemText" , curTable.getString(ii));
                 srcTable.add(map);
             }
         }

         saTable.notifyDataSetChanged();
     }
     /**
      * 设置表格的最多显示的行数
      * @param row 表格的行数
      */
     public   void  gvSetTableRowCount( int  row)
     {
         TableRowCount=row;
     }

     /**
      * 取得表格的最大行数
      * @return 行数
      */
     public   int  gvGetTableRowCount()
     {
         return  TableRowCount;
     }

     /**
      * 取得当前分页的Cursor
      * @return 当前分页的Cursor
      */
     public  Cursor gvGetCurrentTable()
     {
         return  curTable;
     }

     /**
      * 准备分页显示数据
      * @param rawSQL sql语句
      * @param db 数据库
      */
     public   void  gvReadyTable(String rawSQL,SQLiteDatabase db)
     {
         this .rawSQL=rawSQL;
         this .db=db;
     }

     /**
      * 刷新分页栏，更新按钮数量
      * @param sql SQL语句
      * @param db 数据库
      */
     public   void  gvUpdatePageBar(String sql,SQLiteDatabase db)
     {
         Cursor rec = db.rawQuery(sql, null );
         rec.moveToLast();
         long  recSize=rec.getLong( 0 ); //取得总数
         rec.close();
         int  pageNum=( int )(recSize/TableRowCount) +  1 ; //取得分页数

         srcPageID.clear();
         for  ( int  i =  0 ; i < pageNum; i++) {
             HashMap<String, String> map = new  HashMap<String, String>();
             map.put("ItemText" ,  "No."  + String.valueOf(i)); // 添加图像资源的ID
             srcPageID.add(map);
         }
         saPageID.notifyDataSetChanged();
     }
     //---------------------------------------------------------
     /**
      * 表格被点击时的回调函数
      */
     public   void  setTableOnClickListener(OnTableClickListener click) {
         this .clickListener = click;
     }

     public   interface  OnTableClickListener {
         public   void  onTableClickListener( int  x, int  y,Cursor c);
     }
     //---------------------------------------------------------
     /**
      * 分页栏被点击时的回调函数
      */
     public   void  setOnPageSwitchListener(OnPageSwitchListener pageSwitch) {
         this .switchListener = pageSwitch;
     }
     public   interface  OnPageSwitchListener {
         public   void  onPageSwitchListener( int  pageID, int  pageCount);
     }
 }