Events that fire after screen infrastructure?

Hello

I am writing a little game.  I use the same top-level class that we've all seen in the tutorials.  He did push a TitleScreen object, which extends the fullscreen RIM class, in the stack to display and then delve into the event dispatcher.  Initially, the TitleScreen contains only a background graphic and a LabelField that says "Loading"... ».

Then, the GameScreen object is very large and its constructor instantiates a large number of other objects.  Instantiating this object takes between five and ten seconds to arrive, according to the model of Blackberry.

Once the GameScreen object is loaded into memory, I change the TitleScreen, add() and delete() methods in the class of the screen to remove the "Loading...". ' LabelField and replace it with a ButtonField labeled 'Start '.

I used to have the code for these three steps in the main() method.  Everything works well except that the 'Loading... '. "TitleScreen is never drawn on the screen until the program begins the GameScreen object is instantiated and all his baggage.  Point of view of the user, when my program starts the phone just hangs for five to ten seconds, and then the TitleScreen with the 'Start' button appears. It's the wrong shape and that's the problem I'm trying to fix.

The idea is to paint the TitleScreen with the 'Loading... '. ' LabelField on the screen, THEN instantiate the object GameScreen big, fat, sloppy.  Looks like a good theory, but it depends on the frame RIM let me know when the initial TitleScreen is painted and displayed on the top of the display.

In reality, the RIM framework provides appropriate notification that the TitleScreen is displayed.  In the TitleScreen, I replaced the onExposed() method.  However, when the screen first, onExposed() is not called.  My program crashes with the 'Loading... '. "TitleScreen displayed.  Apparently, the framework calls onExposed() only after that the screen is hidden, and onObscured() is called.

I tried to rename the method so it replace onDisplay(), but this method is called before the TitleScreen is painted on the screen, so this does not solve my problem.

I tried to rename the method so it replace onFocus (int), but never, the framework calls this method when the form is first displayed.  Still, my program hangs with the "Loading...". "TitleScreen displayed.  I think it's because the TitleScreen contains no fields that can receive the focus.

I tried to rename the method so it replaces onFocusNotify (boolean), but again, this method is called before my TitleScreen is painted on the screen.

This seems to cover all the methods that I could replace in the Screen class that could solve this problem.  I can't think of anything that could help me.

How can I get the frame RIM to wake up my event feed and let me know that my screen was pushed, painted and displayed?

I suspect that what is happening is maybe because you do not use the framework correctly.

User intervention, including painting the screen and user input processing, occurs on the event Thread.  It is a special thread that is, if I understand correctly, the same Thread that is used to treat the main().  In any case, at the start, when you issue the thrust at bottom, it is not actually processed immediately, it is planned for the thread of events.  This push for complete, you enterTheDisplatcher.  Given the way you treat your startup, this does not happen until you actually complete your initialization which includes the construction of your intended to GameScreen.

In reality, all you have to do is to display the loading screen, then start a Thread that creates the object background GameScreen.  Once created, it can update the screen way * ensuring that he returned to the event Thread to do this processing.

There are examples of splash screens in the KB and forum (search for splash screens).  They are similar to your loading screen work, however, memory, they all assume that the second screen is available - so spend you the start of the second screen to display screen and how long to stall and it does that a stall, a pop (of himself) and a boost (from the replacement of the screen) I don't think that this process will work for you , because of the delay in the creation of the replacement screen.  But you might find something of value in the KB so please take a look.

Tags: BlackBerry Developers

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