Android提高之SQLite分页表格实现方法

<?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 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>

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 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);
 }
}