TextBox issue

Java on Mobile Devices J2ME
#1

I am having some problems with a TextBox returning 0 on a textBox.getString().length(), even thought there is text entered into it.

I’ve tried every method on a TextBox just to get something out of it. I have only been able to reproduce it on a Nokia 7250, and it only occurs once in a while, often the entered text comes out right - bit puzzling!

I’ve been unable to find anything remotely similar using google :confused:

#2

bah - Strike one up for Nokia - again.
Device bug it would seem. This simple test sometimes fails after typing some input.

package dk.certus;

import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

import javax.microedition.lcdui.*;

/**
 * @author Brian Matzon <matzon@certus.dk>
 */
public class TT extends MIDlet implements CommandListener {

    private Form form;

    private TextBox textBox;
    private Command sendCommand;
    private Command cancelCommand;

    /**
     * Creates a new MIDletLauncher
     */
    public TT() {
        super();
    }

    /**
     * Proxies the call to the SystemController
     * 
       * @see javax.microedition.midlet.MIDlet#startApp()
       */
    protected void startApp() throws MIDletStateChangeException {
      form = new Form("Empty");
      form.addCommand(new Command("Action", Command.SCREEN, 1));
      form.setCommandListener( 
        new CommandListener() {
          public void commandAction(Command c, Displayable d) {
            showTextBox();
          }
      });
      Display.getDisplay(this).setCurrent(form);
    }

    /**
       * Proxies the call to the SystemController
       * 
       * @see javax.microedition.midlet.MIDlet#pauseApp()
       */
    protected void pauseApp() {
    }

    /**
       * Proxies the call to the SystemController
       * 
       * @see javax.microedition.midlet.MIDlet#destroyApp(boolean)
       */
    protected void destroyApp(boolean unconditional) throws MIDletStateChangeException {
    }
    
    private void showTextBox() {
      sendCommand = new Command("Send", Command.OK, 1);
      cancelCommand = new Command("Cancel", Command.CANCEL, 2);
      textBox = new TextBox("To", null, 350, TextField.ANY);
      textBox.addCommand(sendCommand);
      textBox.addCommand(cancelCommand);
      textBox.setCommandListener(this);
      Display.getDisplay(this).setCurrent(textBox);
    }      
    
    public void commandAction(Command command, Displayable displayable) {
        String message;
        // if send action, craft a message for symfoni
        if(command == sendCommand && textBox.getString().length() > 0) {
          message = textBox.getString();
        } else {
          char[] chars = new char[256];
          textBox.getChars(chars);
          message = "Error\n";
          message += "Type: " + command.getCommandType();
          message += "Label: " + command.getLabel();
          message += "String: " + textBox.getString();
          message += "Length: " + textBox.getString().length();
          message += "Chars: " + new String(chars);
          message += "Size: " + textBox.size();
          message += "CaretPosition: " + textBox.getCaretPosition();
        }

        // yes create a new one each time - the error occurs regardless
        textBox = null;
        sendCommand = null;
        cancelCommand = null;
        
        Alert alert = new Alert("Result", message, null, null);
        alert.setTimeout(Alert.FOREVER);
        Display.getDisplay(this).setCurrent(alert, form);
    }    
}