timertest.java

大量j2me源代码

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.util.*;

/**
 * A MIDlet which demonstrates a Timer in action.
 * @author Martin J. Wells
 */
public class TimerTest extends javax.microedition.midlet.MIDlet
{
   private Form form;
   private Timer timer;
   private PrintTask task;

   /**
    * MIDlet constructor that creates a form, timer and simple task. See the
    * inner class PrintTask for more information on the task we'll be executing.
    */
   public TimerTest()
   {
      form = new Form("Timer Test");

      // Setup the timer and the print timertask
      timer = new Timer();
      task = new PrintTask();
   }

   /**
    * Called by the Application Manager when the MIDlet is starting or resuming
    * after being paused. In this example it acquires the current Display object
    * and uses it to set the Form object created in the MIDlet constructor as
    * the active Screen to display.
    * @throws MIDletStateChangeException
    */
   protected void startApp() throws MIDletStateChangeException
   {
      // display our UI
      Display.getDisplay(this).setCurrent(form);

      // schedule the task for execution every 100 milliseconds
      timer.schedule(task, 1000, 1000);
   }

   /**
    * Called by the MID's Application Manager to pause the MIDlet. A good
    * example of this is when the user receives an incoming phone call whilst
    * playing your game. When they're done the Application Manager will call
    * startApp to resume. For use this in order to stop the timer from running.
    */
   protected void pauseApp()
   {
      task.cancel();
   }

   /**
    * Called by the MID's Application Manager when the MIDlet is about to
    * be destroyed (removed from memory). You should take this as an opportunity
    * to clear up any resources and save the game. For this example we cancel
    * the timer.
    * @param unconditional if false you have the option of throwing a
    * MIDletStateChangeException to abort the destruction process.
    * @throws MIDletStateChangeException
    */
   protected void destroyApp(boolean unconditional)
           throws MIDletStateChangeException
   {
      timer.cancel();
   }

   /**
    * An example of a TimerTask that adds some text to the form.
    */
   class PrintTask extends TimerTask
   {
      /**
       * To implement a task you need to override the run method.
       */
      public void run()
      {
         // output the time the task ran at
         form.append("" + scheduledExecutionTime());
      }
   }
}