mylist.java

英语背单词联网版本

/*
 * MyList.java
 *
 * Created on 2003年11月27日, 下午3:45
 */

package handenglish;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.util.*;
import java.io.*;
import javax.microedition.rms.*;
/**
 *
 * @author  com
 * @version
 */
public class MyList extends List {
    private Vector listVector;
    public Canvas parent;
    private Image bookImg;
    private Midlet midlet;
    public MyList(Midlet midlet,String title){
        super(title,List.IMPLICIT);
        listVector=new Vector();
        this.midlet = midlet;
        try{
            bookImg=Image.createImage("/handenglish/images/book.png");
        }catch(Exception e){}
    }
    public boolean isNullList(){
        if(listVector.size()==0)
            return true;
        else
            return false;
    }
    public void initSetSelectedIndex(){
        int a=-1;
        String storeName=SysParam.getInstance().storeName;
        if(listVector.size()!=0){
            for(int i=0;i<listVector.size()/3;i++){
                if(storeName.startsWith((String)listVector.elementAt(i*3+1))){
                    a=i;
                    break;
                }
            }
            if(a>=0){
                setSelectedIndex(a,true);
            }
            else{
                setSelectedIndex(0,true);
            }
        }
    }
    public String getName(){
        return getString( getSelectedIndex());
    }
    public int getNo(){
        int c=-1;
        int b=getSelectedIndex();
        if(b>=0)
            c=Integer.valueOf((String)listVector.elementAt(b*3)).intValue();
        return c;
    }
    public int getVolume(){
        int d=-1;
        int b=getSelectedIndex();
        if(b>=0)
            d=Integer.valueOf((String)listVector.elementAt(b*3+2)).intValue();
        return d;
    }
    public void addData(int no,String name,int volume){
        listVector.addElement(String.valueOf(no));
        listVector.addElement(name);
        listVector.addElement(String.valueOf(volume));
        append(name+"[共"+volume+"册]",bookImg);
    }
    
    public void loadData(){
        DbApi listDb = new DbApi( "listdb" );
        try {
            RecordEnumeration tempEnumRecord = listDb.getAllRecord();
            int rid = 0,tLen;
            byte[] tempRecord = new byte[100];
            ByteArrayInputStream tempBis=new ByteArrayInputStream(tempRecord);
            DataInputStream tempDis=new DataInputStream(tempBis);
            
            while(tempEnumRecord.hasNextElement()) {
                rid = tempEnumRecord.nextRecordId();
                tLen = listDb.myRecordStore.getRecordSize( rid );
                if ( tLen > tempRecord.length )
                    tempRecord = new byte[tLen + 40];
                listDb.myRecordStore.getRecord(rid,tempRecord,0);
                tempBis.reset();
                addData(tempDis.readInt(),tempDis.readUTF(),tempDis.readInt());
            }
        }
        catch( Exception e ) {}
        finally {
            listDb.closeDatabase();
        }
    }
}