deletefriendscreen.java

J2ME的源码！我以前学习J2ME的源码哈！非常适合初学者

package telphonebook;

import java.util.Vector;

import javax.microedition.lcdui.Choice;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.List;
import javax.microedition.rms.InvalidRecordIDException;
import javax.microedition.rms.RecordEnumeration;
import javax.microedition.rms.RecordStoreException;
import javax.microedition.rms.RecordStoreNotOpenException;

public class DeleteFriendScreen extends List implements CommandListener {

	private static final String DELETE = "鍒犻櫎";

	private Vector friendID;

	public DeleteFriendScreen() {
		super(Constant.TITLE_DELETE_FRIEND_SCREEN, Choice.MULTIPLE);
		initCommand();
		initFriendInfo();
	}

	private void initFriendInfo() {
		try {
			RecordEnumeration re = Constant.telphoneStore.enumerateRecords(
					null, new NameComparator(), true);
			friendID = new Vector();
			while (re.hasNextElement()) {
				int id = re.nextRecordId();
				friendID.addElement(new Integer(id));
				Account friend = Account.decode(Constant.telphoneStore
						.getRecord(id));
				append(friend.getName(), null);
			}
			re.destroy();
		} catch (RecordStoreNotOpenException e) {
			e.printStackTrace();
		} catch (InvalidRecordIDException e) {
			e.printStackTrace();
		} catch (RecordStoreException e) {
			e.printStackTrace();
		}

	}

	private void initCommand() {
		addCommand(new Command(DELETE, Command.OK, 0));
		addCommand(Constant.BACK_COMMAND);
		setCommandListener(this);
	}

	public void commandAction(Command cmd, Displayable arg1) {
		String label = cmd.getLabel();
		if (label.equals(DELETE)) {
			delete();
		} else if (label.equals(Constant.BACK)) {
			Constant.toMainScreen();
		}
	}

	private void delete() {
		int count = friendID.size();
		if (count == 0)
			return;
		deleteFriend(count);
		updateScreen();
	}

	private void updateScreen() {
		deleteAll();
		initFriendInfo();
	}

	private void deleteFriend(int count) {
		boolean[] selects = new boolean[count];
		getSelectedFlags(selects);
		for (int i = 0; i < count; i++) {
			if (selects[i]) {
				try {
					Constant.telphoneStore.deleteRecord(((Integer) friendID
							.elementAt(i)).intValue());
				} catch (RecordStoreNotOpenException e) {
					e.printStackTrace();
				} catch (InvalidRecordIDException e) {
					e.printStackTrace();
				} catch (RecordStoreException e) {
					e.printStackTrace();
				}
			}
		}
	}

}