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Developer
KeniF
Posts: 131
Registered: ‎08-13-2008
My Device: Not Specified
Accepted Solution

IllegalStateException in OptionsProvider

I created an options page for my application using the "How To - Add application options to the BlackBerry Options" example. Loading and saving worked fine, but when I opened the page a second time it crashes with an IllegalStateException. It's already been solved, but I don't know the reason. 

private RichTextField text_allow; //Will crash program //private RichTextField text_allow=new RichTextField("Allow connections:",Field.NON_FOCUSABLE); public void populateMainScreen(MainScreen screen){ optionsProperties=SMOptionsProperties.getSMOP();

 

//works when initialised here text_allow=new RichTextField("Allow connections:",Field.NON_FOCUSABLE); screen.add(text_allow); //other things omitted }//populatrMainScreen

 

Is it something to do with

 

//Null out our member variables so that their objects can be garbage //collected. Note that this instance continues to be held by the //options manager even after the user exits the options app, //and will be re-used next time.

If I null out text_allow, NullPointerException is thrown.

If I don't, it's an IllegalStateException.

 

 

 

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Administrator
MSohm
Posts: 14,308
Registered: ‎07-09-2008
My Device: BlackBerry Z30, BlackBerry PlayBook
My Carrier: Bell

Re: IllegalStateException in OptionsProvider

Every time an Options screen is shown, populateMainScreen is called and a new instance of MainScreen created.  This means you'll also need to create a new instance of your fields to be added to this new instance of MainScreen.

 

A field can only be added to a single screen.  By instantiating text_allow outside of populateMainScreen you are re-using the instance of that field, which does not work.

Mark Sohm
BlackBerry Development Advisor

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