Android入门教程(三十二)------之SQLite分页表格(转)

博客园 - 生如夏花之灿烂

生如夏花之灿烂 · 2011-08-11 · via 博客园 - 生如夏花之灿烂

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>

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>

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;
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);
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);
table.gvUpdatePageBar("select count(*) from " + TABLE_NAME,db);
table.gvReadyTable("select * from " + TABLE_NAME,db);
}else if (v == btnClose) {
table.gvRemoveAll();
db.close();
}
}
}
void CreateDB() {
db = SQLiteDatabase.create(null);
Log.e("DB Path", db.getPath());
String amount = String.valueOf(databaseList().length);
Log.e("DB amount", amount);
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) {}
}
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;
protected ArrayList<HashMap<String, String>> srcPageID,srcTable;
protected int TableRowCount=10;
protected int TableColCount=0;
protected SQLiteDatabase db;
protected String rawSQL="";
protected Cursor curTable;
protected OnTableClickListener clickListener;
protected OnPageSwitchListener switchListener;
public GVTable(Context context) {
super(context);
this.setOrientation(VERTICAL);
gvTable=new GridView(context);
addView(gvTable, new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
srcTable = new ArrayList<HashMap<String, String>>();
saTable = new SimpleAdapter(context,
srcTable,
R.layout.items,
new String[] { "ItemText" },
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;
int x=arg2 % curTable.getColumnCount();
if (clickListener != null
&& y!=-1) {
clickListener.onTableClickListener(x,y,curTable);
}
}
});
gvPage=new GridView(context);
gvPage.setColumnWidth(40);
gvPage.setNumColumns(GridView.AUTO_FIT);
addView(gvPage, new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
srcPageID = new ArrayList<HashMap<String, String>>();
saPageID = new SimpleAdapter(context,
srcPageID,
R.layout.items,
new String[] { "ItemText" },
new int[] { R.id.ItemText });
gvPage.setAdapter(saPageID);
gvPage.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
LoadTable(arg2);
if(switchListener!=null){
switchListener.onPageSwitchListener(arg2,srcPageID.size());
}
}
});
}
public void gvRemoveAll()
{
if(this.curTable!=null)
curTable.close();
srcTable.clear();
saTable.notifyDataSetChanged();
srcPageID.clear();
saPageID.notifyDataSetChanged();
}
protected void LoadTable(int pageID)
{
if(curTable!=null)
curTable.close();
String sql= rawSQL+" Limit "+String.valueOf(TableRowCount)+ " Offset " +String.valueOf(pageID*TableRowCount);
curTable = db.rawQuery(sql, null);
gvTable.setNumColumns(curTable.getColumnCount());
TableColCount=curTable.getColumnCount();
srcTable.clear();
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);
}
int recCount=curTable.getCount();
for (int i = 0; i < recCount; i++) {
curTable.moveToPosition(i);
for(int ii=0;ii<colCount;ii++)
{
HashMap<String, String> map = new HashMap<String, String>();
map.put("ItemText", curTable.getString(ii));
srcTable.add(map);
}
}
saTable.notifyDataSetChanged();
}
public void gvSetTableRowCount(int row)
{
TableRowCount=row;
}
public int gvGetTableRowCount()
{
return TableRowCount;
}
public Cursor gvGetCurrentTable()
{
return curTable;
}
public void gvReadyTable(String rawSQL,SQLiteDatabase db)
{
this.rawSQL=rawSQL;
this.db=db;
}
public void gvUpdatePageBar(String sql,SQLiteDatabase db)
{
Cursor rec = db.rawQuery(sql, null);
rec.moveToLast();
long recSize=rec.getLong(0);
rec.close();
int pageNum=(int)(recSize/TableRowCount) + 1;
srcPageID.clear();
for (int i = 0; i < pageNum; i++) {
HashMap<String, String> map = new HashMap<String, String>();
map.put("ItemText", "No." + String.valueOf(i));
srcPageID.add(map);
}
saPageID.notifyDataSetChanged();
}
public void setTableOnClickListener(OnTableClickListener click) {
this.clickListener = click;
}
public interface OnTableClickListener {
public void onTableClickListener(int x,int y,Cursor c);
}
public void setOnPageSwitchListener(OnPageSwitchListener pageSwitch) {
this.switchListener = pageSwitch;
}
public interface OnPageSwitchListener {
public void onPageSwitchListener(int pageID,int pageCount);
}
}

此内容由惯性聚合(RSS阅读器)自动聚合整理，仅供阅读参考。原文来自 — 版权归原作者所有。

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