转自http://www.android-study.com/jichuzhishi/496.html
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:testSQLite.rar
items.xml的代码如下,它是“表格区”和“分页栏”的格单元实现:
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<? xml version = "1.0" encoding = "utf-8" ?>
< LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
android:id = "@+id/LinearLayout01"
android:layout_width = "fill_parent"
android:background = "#555555"
android:layout_height = "wrap_content" >
< TextView
android:id = "@+id/ItemText"
android:layout_below = "@+id/ItemImage"
android:text = "TextView01"
android:bufferType = "normal"
android:singleLine = "true"
android:background = "#000000"
android:layout_width = "fill_parent"
android:layout_height = "wrap_content"
android:gravity = "center"
android:layout_margin = "1dip"
android:layout_gravity = "center"
/>
</ LinearLayout >
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main.xml的代码如下:
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<? 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:id = "@+id/btnCreateDB"
android:layout_height = "wrap_content"
android:layout_width = "fill_parent"
android:text = "创建数据库"
/>
< Button
android:id = "@+id/btnInsertRec"
android:layout_height = "wrap_content"
android:layout_width = "fill_parent"
android:text = "插入一串实验数据"
/>
< Button
android:id = "@+id/btnClose"
android:layout_width = "fill_parent"
android:layout_height = "wrap_content"
/>
</ LinearLayout >
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演示程序testsqlite.java的源码:
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package com.testsqlite;
import android.app.Activity;
import android.database.Cursor;
import android.database.sqlException;
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;
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 , 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);
} 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 {
} catch (sqlException e) {
}
}
}
}
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分页表格控件GVTable.java的源码:
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@H_353_3011@
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@H_487_3015@
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@H_935_3019@
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@H_798_3403@
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package com.testsqlite;
import java.util.ArrayList;
import java.util.HashMap;
import android.content.Context;
import android.database.Cursor;
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
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 });
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
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 });
gvPage.setAdapter(saPageID);
// 添加消息处理
gvPage.setOnItemClickListener( new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0,
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();
}
/**
* 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();
+ " 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
@H_935_3019@
{
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
*/
this .db = db;
}
/**
*
* @param sql
* sql语句
* @param db
* 数据库
*/
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.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,Cursor c);
}
// ---------------------------------------------------------
/**
*/
public void setOnPageSwitchListener(OnPageSwitchListener pageSwitch) {
this .switchListener = pageSwitch;
}
public interface OnPageSwitchListener {
public void onPageSwitchListener( int pageID, int pageCount);
}
}
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