Source Code : Change Label Text

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Change Label Text

/*--------------------------------------------------
* ChangeLabelText.java
*
* Example from the book:     Core J2ME Technology
* Copyright John W. Muchow   http://www.CoreJ2ME.com
* You may use/modify for any non-commercial purpose
*-------------------------------------------------*/
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class ChangeLabelText extends MIDlet implements CommandListener
{
  private Display display;      // Reference to Display object
  private Form fmMain;          // The main form
  private StringItem siUser;    // The message
  private Command cmNext;       // Next label and message
  private Command cmExit;       // Command to exit the MIDlet

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

    // Create text message and commands
    siUser = new StringItem("UserId: ", "johnm");
    cmNext = new Command("Next", Command.SCREEN, 1);
    cmExit = new Command("Exit", Command.EXIT, 1);

    // Create Form, add Command & StringItem, listen for events
    fmMain = new Form("Preferences");    
    fmMain.addCommand(cmExit);
    fmMain.addCommand(cmNext);    
    fmMain.append(siUser);
    fmMain.setCommandListener(this);   
  }

  // Called by application manager to start the MIDlet.
  public void startApp()
  {
    display.setCurrent(fmMain);
  }

  public void pauseApp()
  { }
  
  public void destroyApp(boolean unconditional)
  { }

  public void commandAction(Command c, Displayable s)
  {
    if (c == cmNext)
    {
      // This method is inherited from the Item class
      siUser.setLabel("Account #: ");
      
      // Change the text
      siUser.setText("731");           
      
      // Remove the Next command
      fmMain.removeCommand(cmNext);
    }
    else if (c == cmExit)
    {
      destroyApp(false);
      notifyDestroyed();
    } 
  }
}


           
       

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