eventloggerui.java

一个基于PlaceLab的室内和室外的智能导航系统

package org.placelab.midp;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.List;
import javax.microedition.rms.RecordStoreException;

public class EventLoggerUI implements CommandListener, UIComponent {
	Display display;
	List displayList;
	Command backC, selectC;
	static final String CS_SHOW = "Show Event Log";
	static final String CS_UPLOAD = "Upload Event Log";
	static final String CS_CLEAR = "Clear Event Log";

	public EventLoggerUI(Display display, UIComponent back) {
		this.display = display;

		displayList = new List("Event Log Utilities", List.IMPLICIT);

		displayList.append(CS_SHOW, null);
		displayList.append(CS_UPLOAD, null);
		displayList.append(CS_CLEAR, null);
		selectC = new Command("Select", Command.OK, 1);
		backC = new Command("Back", Command.BACK, 1);
		displayList.addCommand(selectC);
		displayList.addCommand(backC);
		displayList.setCommandListener(this);
		this.back = back;
	}

	//		
	// Respond to commands. 
	public void commandAction(Command c, Displayable s) {
		if (c == selectC || c == List.SELECT_COMMAND) {
			try {
				String str = displayList.getString(displayList
						.getSelectedIndex());
				if (str == CS_SHOW) {
					EventLogListUI loglist = new EventLogListUI(display, this);
					loglist.showUI(this);
				} else if (str == CS_UPLOAD) {
					EventLogUploadUI logupload = new EventLogUploadUI(display,this);
					logupload.showUI(this);
				} else if (str == CS_CLEAR) {
					EventLogger.deleteAll();
					showUI(this);
				}
			} catch (NullPointerException npe) {
			} catch (IndexOutOfBoundsException iobe) {
			} catch (RecordStoreException rse) {
			}
		} else if (c == backC) {
			if (back != null)
				back.showUI(this);
		}
	}

	UIComponent back;

	public void showUI(UIComponent from) {
		String rmsnum = "unknown";
		rmsnum = "" + EventLogger.numRecords();
		displayList.setTitle("Event Log (" + rmsnum + " events in log)");
		display.setCurrent(displayList);
	}
}