mycalendar.java

J2ME 无线通信技术应用开发源代码

// 程序名MyCalendar.java
// 测试Timer和TimerTask
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.util.*;

public class MyCalendar extends MIDlet implements CommandListener {
  private Display display;
  private Form calendarForm;
  private Form mainForm;
  private Command cmdExit; 
  private Command cmdAdd; 
  private Command cmdCancel; 
  private Command cmdOK; 
  private DateField dateField;
  private TextField msgField;

  Timer timer = new Timer();

  public MyCalendar() {
    display = Display.getDisplay(this);

    cmdExit = new Command("Exit", Command.SCREEN, 1);
    cmdAdd = new Command("Add", Command.SCREEN, 1);
    mainForm = new Form("Add a task");
    mainForm.addCommand(cmdExit);
    mainForm.addCommand(cmdAdd);
    mainForm.setCommandListener(this);
    
    cmdCancel = new Command("Cancel", Command.SCREEN, 1);
    cmdOK = new Command("OK", Command.SCREEN, 1);
    dateField = new DateField("My Calendar",DateField.DATE_TIME);
    dateField.setDate(new Date(System.currentTimeMillis()));
    msgField = new TextField("Message:","",100,0);
    calendarForm = new Form("Test DateField");
    calendarForm.append(dateField);
    calendarForm.append(msgField);
    calendarForm.addCommand(cmdCancel);
    calendarForm.addCommand(cmdOK);
    calendarForm.setCommandListener(this);
  }

  public void startApp() {
    display.setCurrent(mainForm);
  }

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) {
  }

  public void commandAction(Command c, Displayable d) {
    if (c == cmdExit) {
      destroyApp(false);
      notifyDestroyed();
    } else if (c == cmdAdd) {
    	display.setCurrent(calendarForm);
    } else if (c == cmdCancel) {
    	display.setCurrent(mainForm);
    } else if (c == cmdOK) {
    	display.setCurrent(mainForm);
    	timer.schedule(new AlertTask(msgField.getString(),mainForm),dateField.getDate());
    }
  }

	class AlertTask extends TimerTask {
		String message = "";
		Displayable d;
		AlertTask(String message,Displayable d) {
			this.message = message;
			this.d = d;
		}

  	public void run(){
    	Alert alert = new Alert("Alert!", message, null, null );
    	alert.setTimeout( Alert.FOREVER );
    	display.setCurrent(alert,d);
  	}
	}
}