本文實(shí)現(xiàn)并封裝一個(gè)SQL分頁表格控件，不僅支持分頁還是以表格的形式展示數(shù)據(jù)。先來看看本文程序運(yùn)行的動畫：
這個(gè)SQL分頁表格控件主要分為“表格區(qū)”和“分頁欄”這兩部分，這兩部分都是基于GridView實(shí)現(xiàn)的。網(wǎng)上介紹Android上實(shí)現(xiàn)表格的DEMO一般都用ListView。ListView與GridView對比，ListView最大的優(yōu)勢是格單元的大小可以自定義，可以某單元長某單元短，但是不能自適應(yīng)數(shù)據(jù)表的結(jié)構(gòu)；而GridView最大的優(yōu)勢就是自適應(yīng)數(shù)據(jù)表的結(jié)構(gòu)，但是格單元統(tǒng)一大小。。。對于數(shù)據(jù)表結(jié)構(gòu)多變的情況，建議使用GridView實(shí)現(xiàn)表格。
本文實(shí)現(xiàn)的SQL分頁表格控件有以下特點(diǎn)：
1.自適應(yīng)數(shù)據(jù)表結(jié)構(gòu)，但是格單元統(tǒng)一大??；
2.支持分頁；
3.“表格區(qū)”有按鍵事件回調(diào)處理，“分頁欄”有分頁切換事件回調(diào)處理。
本文程序代碼較多，可以到這里下載整個(gè)工程的源碼：http://www.rayfile.com/files/72e78b68-f2e5-11df-8469-0015c55db73d/
items.xml的代碼如下，它是“表格區(qū)”和“分頁欄”的格單元實(shí)現(xiàn)：
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<?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的代碼如下：
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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:layout_height="wrap_content"
android:layout_width="fill_parent" android:id="@+id/btnCreateDB"
android:text="創(chuàng)建數(shù)據(jù)庫"></Button>
<Button android:layout_height="wrap_content"
android:layout_width="fill_parent" android:text="插入一串實(shí)驗(yàn)數(shù)據(jù)" android:id="@+id/btnInsertRec"></Button>
<Button android:layout_height="wrap_content" android:id="@+id/btnClose"
android:text="關(guān)閉數(shù)據(jù)庫" 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="創(chuàng)建數(shù)據(jù)庫"></Button>
<Button android:layout_height="wrap_content"
android:layout_width="fill_parent" android:text="插入一串實(shí)驗(yàn)數(shù)據(jù)" android:id="@+id/btnInsertRec"></Button>
<Button android:layout_height="wrap_content" android:id="@+id/btnClose"
android:text="關(guān)閉數(shù)據(jù)庫" android:layout_width="fill_parent"></Button>
</LinearLayout>
演示程序testSQLite.java的源碼：
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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;//添加記錄時(shí)的id累加標(biāo)記，必須全局
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);//設(shè)置每個(gè)分頁的ROW總數(shù)
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)+
" 當(dāng)前第"+String.valueOf(pageID)+"頁";
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條記錄
table.gvUpdatePageBar("select count(*) from " + TABLE_NAME,db);
table.gvReadyTable("select * from " + TABLE_NAME,db);
}else if (v == btnClose) {
table.gvRemoveAll();
db.close();
}
}
}
/**
* 在內(nèi)存創(chuàng)建數(shù)據(jù)庫和數(shù)據(jù)表
*/
void CreateDB() {
// 在內(nèi)存創(chuàng)建數(shù)據(jù)庫
db = SQLiteDatabase.create(null);
Log.e("DB Path", db.getPath());
String amount = String.valueOf(databaseList().length);
Log.e("DB amount", amount);
// 創(chuàng)建數(shù)據(jù)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條數(shù)據(jù)
*/
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;//添加記錄時(shí)的id累加標(biāo)記，必須全局
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);//設(shè)置每個(gè)分頁的ROW總數(shù)
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)+
" 當(dāng)前第"+String.valueOf(pageID)+"頁";
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條記錄
table.gvUpdatePageBar("select count(*) from " + TABLE_NAME,db);
table.gvReadyTable("select * from " + TABLE_NAME,db);
}else if (v == btnClose) {
table.gvRemoveAll();
db.close();
}
}
}
/**
* 在內(nèi)存創(chuàng)建數(shù)據(jù)庫和數(shù)據(jù)表
*/
void CreateDB() {
// 在內(nèi)存創(chuàng)建數(shù)據(jù)庫
db = SQLiteDatabase.create(null);
Log.e("DB Path", db.getPath());
String amount = String.valueOf(databaseList().length);
Log.e("DB amount", amount);
// 創(chuàng)建數(shù)據(jù)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條數(shù)據(jù)
*/
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) {
}
}
}
}
分頁表格控件GVTable.java的源碼：
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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.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;// 適配器
protected ArrayList<HashMap<String, String>> srcPageID,srcTable;// 數(shù)據(jù)源
protected int TableRowCount=10;//分頁時(shí)，每頁的Row總數(shù)
protected int TableColCount=0;//每頁col的數(shù)量
protected SQLiteDatabase db;
protected String rawSQL="";
protected Cursor curTable;//分頁時(shí)使用的Cursor
protected OnTableClickListener clickListener;//整個(gè)分頁控件被點(diǎn)擊時(shí)的回調(diào)函數(shù)
protected OnPageSwitchListener switchListener;//分頁切換時(shí)的回調(diào)函數(shù)
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));//寬長式樣
srcTable = new ArrayList<HashMap<String, String>>();
saTable = new SimpleAdapter(context,
srcTable,// 數(shù)據(jù)來源
R.layout.items,//XML實(shí)現(xiàn)
new String[] { "ItemText" },// 動態(tài)數(shù)組與ImageItem對應(yīng)的子項(xiàng)
new int[] { R.id.ItemText });
// 添加并且顯示
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;//標(biāo)題欄的不算
int x=arg2 % curTable.getColumnCount();
if (clickListener != null//分頁數(shù)據(jù)被點(diǎn)擊
&& y!=-1) {//點(diǎn)中的不是標(biāo)題欄時(shí)
clickListener.onTableClickListener(x,y,curTable);
}
}
});
//----------------------------------------
gvPage=new GridView(context);
gvPage.setColumnWidth(40);//設(shè)置每個(gè)分頁按鈕的寬度
gvPage.setNumColumns(GridView.AUTO_FIT);//分頁按鈕數(shù)量自動設(shè)置
addView(gvPage, new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));//寬長式樣
srcPageID = new ArrayList<HashMap<String, String>>();
saPageID = new SimpleAdapter(context,
srcPageID,// 數(shù)據(jù)來源
R.layout.items,//XML實(shí)現(xiàn)
new String[] { "ItemText" },// 動態(tài)數(shù)組與ImageItem對應(yīng)的子項(xiàng)
new int[] { R.id.ItemText });
// 添加并且顯示
gvPage.setAdapter(saPageID);
// 添加消息處理
gvPage.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
LoadTable(arg2);//根據(jù)所選分頁讀取對應(yīng)的數(shù)據(jù)
if(switchListener!=null){//分頁切換時(shí)
switchListener.onPageSwitchListener(arg2,srcPageID.size());
}
}
});
}
/**
* 清除所有數(shù)據(jù)
*/
public void gvRemoveAll()
{
if(this.curTable!=null)
curTable.close();
srcTable.clear();
saTable.notifyDataSetChanged();
srcPageID.clear();
saPageID.notifyDataSetChanged();
}
/**
* 讀取指定ID的分頁數(shù)據(jù),返回當(dāng)前頁的總數(shù)據(jù)
* SQL:Select * From TABLE_NAME Limit 9 Offset 10;
* 表示從TABLE_NAME表獲取數(shù)據(jù)，跳過10行，取9行
* @param pageID 指定的分頁ID
*/
protected void LoadTable(int pageID)
{
if(curTable!=null)//釋放上次的數(shù)據(jù)
curTable.close();
String sql= rawSQL+" Limit "+String.valueOf(TableRowCount)+ " Offset " +String.valueOf(pageID*TableRowCount);
curTable = db.rawQuery(sql, null);
gvTable.setNumColumns(curTable.getColumnCount());//表現(xiàn)為表格的關(guān)鍵點(diǎn)！
TableColCount=curTable.getColumnCount();
srcTable.clear();
// 取得字段名稱
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);
}
// 列舉出所有數(shù)據(jù)
int recCount=curTable.getCount();
for (int i = 0; i < recCount; i++) {//定位到一條數(shù)據(jù)
curTable.moveToPosition(i);
for(int ii=0;ii<colCount;ii++)//定位到一條數(shù)據(jù)中的每個(gè)字段
{
HashMap<String, String> map = new HashMap<String, String>();
map.put("ItemText", curTable.getString(ii));
srcTable.add(map);
}
}
saTable.notifyDataSetChanged();
}
/**
* 設(shè)置表格的最多顯示的行數(shù)
* @param row 表格的行數(shù)
*/
public void gvSetTableRowCount(int row)
{
TableRowCount=row;
}
/**
* 取得表格的最大行數(shù)
* @return 行數(shù)
*/
public int gvGetTableRowCount()
{
return TableRowCount;
}
/**
* 取得當(dāng)前分頁的Cursor
* @return 當(dāng)前分頁的Cursor
*/
public Cursor gvGetCurrentTable()
{
return curTable;
}
/**
* 準(zhǔn)備分頁顯示數(shù)據(jù)
* @param rawSQL sql語句
* @param db 數(shù)據(jù)庫
*/
public void gvReadyTable(String rawSQL,SQLiteDatabase db)
{
this.rawSQL=rawSQL;
this.db=db;
}
/**
* 刷新分頁欄，更新按鈕數(shù)量
* @param sql SQL語句
* @param db 數(shù)據(jù)庫
*/
public void gvUpdatePageBar(String sql,SQLiteDatabase db)
{
Cursor rec = db.rawQuery(sql, null);
rec.moveToLast();
long recSize=rec.getLong(0);//取得總數(shù)
rec.close();
int pageNum=(int)(recSize/TableRowCount) + 1;//取得分頁數(shù)
srcPageID.clear();
for (int i = 0; i < pageNum; i++) {
HashMap<String, String> map = new HashMap<String, String>();
map.put("ItemText", "No." + String.valueOf(i));// 添加圖像資源的ID
srcPageID.add(map);
}
saPageID.notifyDataSetChanged();
}
//---------------------------------------------------------
/**
* 表格被點(diǎn)擊時(shí)的回調(diào)函數(shù)
*/
public void setTableOnClickListener(OnTableClickListener click) {
this.clickListener = click;
}
public interface OnTableClickListener {
public void onTableClickListener(int x,int y,Cursor c);
}
//---------------------------------------------------------
/**
* 分頁欄被點(diǎn)擊時(shí)的回調(diào)函數(shù)
*/
public void setOnPageSwitchListener(OnPageSwitchListener pageSwitch) {
this.switchListener = pageSwitch;
}
public interface OnPageSwitchListener {
public void onPageSwitchListener(int pageID,int pageCount);
}
}
(審核編輯: 智匯小新)
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