deleterecord.java

基于j2me的手机应用程序-电话本

/*
 * 删除记录
 */

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");
				//按照名字的字符串大小排序
				re = rs.enumerateRecords(null, sortCom, true);
				//添加列表项
				byte[] rec;
				int id;
				while (re.hasNextElement()) {
					count = count + 1;
					id = re.nextRecordId();
					recordIDs.addElement(new Integer(id));

					rec = rs.getRecord(id);
					//分解数据库记录数据
					BookAccount account = BookAccount.deserialize(rec);
					//把名字添加到列表中
					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;

			//进入记录编辑界面
			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();
						}

					}

				}
		}
	}

}