deleterecord.java

不一样的手机名片式电话本,其中包括添加新记录

package PhoneBook;

import java.util.Vector;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;
import javax.microedition.rms.*;

public class DeleteRecord extends List implements CommandListener {
	private Displayable dis;
	private MIDlet mid;
	private RecordStore rs=null;
	private RecordEnumeration re=null;
	private Vector recordIds=null;
	private int count=0;

	private static final Command deleteCommand=new Command("删除",Command.OK,1);
	private static final Command backCommand=new Command("返回",Command.BACK ,2);
	
	public DeleteRecord(Displayable dis,MIDlet mid,RecordStore rs){
		super("删除记录",Choice.MULTIPLE);
		this .dis=dis;
		this.mid=mid;
		this.rs=rs;
		this.addCommand(backCommand);
		this.addCommand(deleteCommand);
		this.setCommandListener(this);
		
		recordIds=new Vector();
		SortComparator sortCom=new SortComparator();
		if(rs!=null){
		try{	Image icon=Image.createImage("/txt.png");
			re=rs.enumerateRecords(null,sortCom, true);
			byte[] rec;
			int id;
			while(re.hasNextElement()){
				count=count+1;
				id=re.nextRecordId();
				recordIds.addElement(new Integer(id));
				rec=rs.getRecord(id);
				BookAccount account=BookAccount.deserialize(rec);
				int index=this.append(account.getUserName(), icon);
				
			}
		}catch (Exception e){
			
		}finally{
			if(re!=null)
				re.destroy();
		}
	}

}
	public void commandAction (Command c ,Displayable d){
		if(c==backCommand){
			Display.getDisplay(mid).setCurrent(dis);
		}
		if (c==deleteCommand){
			if(count==0)
				return;
			boolean[] selectedArray=new boolean[count];
			this.getSelectedFlags(selectedArray);
			int i=0,j=0;
			for(i=0;i<count;i++)
				if(selectedArray[i]==true){
					if(!recordIds.isEmpty()){
						j=((Integer)recordIds.elementAt(i)).intValue();
						try{
							rs.deleteRecord(j);
							Display.getDisplay(mid).setCurrent(dis);
						}catch (Exception e){
							e.printStackTrace();
						}
					}
				}
			
		}
	}
}