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J2ME problems with textbox

Posted on 2003-11-06
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Last Modified: 2007-12-19
Started learning java micro edition, so Im still a bit of a newbie, but Ive come across a problem when i try to use a textbox more than once.

Using (as an example) guitests.java available at
http://wireless.java.sun.com/midp/articles/ui/      (html version) and
http://wireless.java.sun.com/midp/articles/ui/GuiTests.java   (java code)

I can go to the textbox form, hit back, go there again and i get this thrown at me:

java.lang.IllegalStateException
      at javax.microedition.lcdui.Form.append(+20)
      at one.SendTo(+24)
      at one.commandAction(+383)
      at javax.microedition.lcdui.List.callKeyPressed(+74)
      at javax.microedition.lcdui.Display$DisplayAccessor.keyEvent(+202)
      at javax.microedition.lcdui.Display$DisplayManagerImpl.keyEvent(+11)
      at com.sun.midp.lcdui.DefaultEventHandler.keyEvent(+124)
      at com.sun.midp.lcdui.AutomatedEventHandler.keyEvent(+210)
      at com.sun.midp.lcdui.DefaultEventHandler$QueuedEventHandler.run(+178)

Ive semi managed to work around it by putting in a form.delete(0) and form.deleteAll(), but its still buggy. Is there a way to make textboxs work?
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Question by:hippydaz
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jimmack earned 80 total points
ID: 9693545
The problem isn't with the TextBox itself.  You are attempting to add it to a from (using append), when the form already has the text box in it.

You seem to have realised this because you are using form.delete... to remove it.  Have a look in your SendTo method to see if you really need to add the text box each time.  Perhaps you could just change (or clear) the contents.
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Author Comment

by:hippydaz
ID: 9700168
Okay, this is just weird.

I already kinda knew that, was wondering how to actually do it.

So i check the guitests.java , and theyve updated it. (mustve been in the last day or so) so it doesnt crash anymore.

I can get around it by adding the textfield to the form at the startup method and then just showing the form whenever i need.

Oh well....points to jimmack anyway, seeing as he did his best to help me.

Ta.
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LVL 15

Expert Comment

by:jimmack
ID: 9700211
Thanx

;-)

If you need more help, I hang around both here (Java) and also in the Wireless Programming area - that's not as busy though ;-)
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