Compensation of screen transitions

So I now use the screen transitions in my application.  Their implementation is very simple.  I just called setTransition() on UiEngineInstance for the push and pop transitions.

However, the JavaDocs for setTransition() also say:

This method maintains a reference to the screen of objects passed into it until the application ends. For screens are properly garbage collected when they are no longer needed, an application must also clear any transition previously set for them.

Because I don't want my request to keep unnecessary references to unused screens, this is a problem.  The problem is that I have absolutely no idea where I'm supposed to actually to be clear transitions of!  (especially since I use pushScreen())

If I erase the transitions for a screen in any code that is executed on the pop (onUndisplay () /onUiEngineAttached (false), or in a ScreenUiEngineAttachedListener), the pop transition is never displayed to the user.

So exactly how to run the code (to clear the transition) after the pop * and * after the transition from pop?

To clear the transition you must TransitionContext to null in the UiEngineInstance (.setTransition) method.

You can call it in the Screen.onUiEngineAttached, but you need to wrap the call in a passable invokeLater (as shown here).

Update a screen on the main event Thread

http://supportforums.BlackBerry.com/T5/Java-development/update-a-screen-on-the-main-event-thread/TA-...

Tags: BlackBerry Developers

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