Source Code : Api concepts Refer to the startApp pauseApp, and destroyApp

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Api concepts Refer to the startApp pauseApp, and destroyApp

/*
 * AdvanceCommands.java 
 * Copyright (c) 2000 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Author: Srikanth Raju
 *
 * This software is the confidential and proprietary information of Sun
 * Microsystems, Inc. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with Sun.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
 * SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
 * THIS SOFTWARE OR ITS DERIVATIVES.
 */

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.TextBox;
import javax.microedition.midlet.MIDlet;

/**
 * An MIDlet that illustrates more MIDP UI Api concepts Refer to the startApp,
 * pauseApp, and destroyApp methods so see how each handles the requested
 * transition.
 */
public class AdvanceCommands extends MIDlet implements CommandListener {

  private Command exitCommand; // The exit command

  private Command nextCommand; // next command

  private Command backCommand; // back command

  private TextBox t1;

  private TextBox t;

  private Display display; // The display for this MIDlet

  public AdvanceCommands() {
    display = Display.getDisplay(this);
    nextCommand = new Command("Next", Command.SCREEN, 1);
    exitCommand = new Command("Quit", Command.SCREEN, 2);
    backCommand = new Command("Back", Command.BACK, 2);

  }

  /**
   * Start up the Hello MIDlet by creating the TextBox and associating the
   * exit command and listener.
   */
  public void startApp() {
    t = new TextBox("Hello MIDlet", "Test string", 256, 0);

    t.addCommand(nextCommand);
    t.addCommand(exitCommand);
    t.setCommandListener(this);

    display.setCurrent(t);
  }

  /**
   * Pause is a no-op since there are no background activities or record
   * stores that need to be closed.
   */
  public void pauseApp() {
  }

  /**
   * Destroy must cleanup everything not handled by the garbage collector. In
   * this case there is nothing to cleanup.
   */
  public void destroyApp(boolean unconditional) {
  }

  /*
   * Respond to commands, including exit On the exit command, cleanup and
   * notify that the MIDlet has been destroyed.
   */
  public void commandAction(Command c, Displayable s) {
    if (c == exitCommand) {
      destroyApp(false);
      notifyDestroyed();
    }
    if (c == nextCommand) {
      t1 = new TextBox("2nd TextBox", "2nd TextBox", 256, 0);
      t1.addCommand(backCommand);
      t1.addCommand(exitCommand);
      t1.setCommandListener(this);
      display.setCurrent(t1);
    }

    if (c == backCommand) {
      display.setCurrent(t);
    }
  }

}


           
       

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