Source Code : StringItem Alternative

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StringItem Alternative

/*--------------------------------------------------
* StringItemAlternative.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 StringItemAlternative extends MIDlet implements CommandListener
{
  private Display display;      // Reference to Display object for this MIDlet
  private Form fmMain;         // The main form
  private Command cmNext;      // Next label and message
  private Command cmExit;      // Command to exit the MIDlet
  private int msgIndex;         // Index of our message text on form
  private static int count = 0; // How many times through our loop

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

    // Create commands
    cmNext = new Command("Next", Command.SCREEN, 1);
    cmExit = new Command("Exit", Command.EXIT, 1);

    // Create Form, add Command & message, listen for events
    fmMain = new Form("Preferences");    
    fmMain.addCommand(cmExit);
    fmMain.addCommand(cmNext);    
    
    // Save the index location of this item
    msgIndex = fmMain.append("UserId: johnm");
    
    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)
    {
      if (count++ == 0)
      {
        //--------------------------------
        // Option # 1      
        // First time through this method
        //--------------------------------
         StringItem tmpItem = (StringItem) fmMain.get(msgIndex);
         System.out.println("tmpItem.getLabel(): " + tmpItem.getLabel());
         System.out.println("tmpItem.getText(): " + tmpItem.getText());         
         tmpItem.setLabel("Account #: ");  //inherited from Item class
         tmpItem.setText("731");
      }
      else
      {
        //--------------------------------
        // Option # 2      
        // Second time through this method
        //--------------------------------
         fmMain.set(msgIndex, new StringItem("Password: ", "superPants"));
        
        // Remove the Update command
        fmMain.removeCommand(cmNext);
      }
    }
    else if (c == cmExit)
    {
      destroyApp(false);
      notifyDestroyed();
    } 
  }
}


           
       

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