onFocus() not pulling between screen push/pop

   protected void onFocus(int args)
    {
        super.onFocus(args);
        invalidate();
        Dialog.inform("Screen refreshed test.");
    }

In the screen of my parent, I have this code that is not triggered during the initial loading screen up, nor when subsequent reviews are dépilés. I push the battery screens based on the options menu, when finished, I jump the battery that "theoretically" should mean a the next screen which is now visible won focus which should cause the onFocus trigger, but it didn't.

This code does nothing... So that being said, when the 'parent' or 'visible' screen gains focus, I have to simply redo all controls and refresh data, so what method is used to determine that the screen is now from the top of the stack and visible?

onObscured() / onExposed() pair is probably the most fitting place to check such things. Can be replaced by onVisibilityChange (boolean).

However, unless you have some very custom paint override, don't bother invalidate - when the screen is pushed first, it is painted in any case; When all the screens above it get jumped (so that it becomes the active screen) it is also repainted the (partially, if the split screen was smaller than full screen).

Ironically, scrolling does not always cause paint this over - it seems that the BlackBerry has a few graphics buffers that are larger than the screen. I discovered the hard way when I created a Windows type scroll bar and I saw that it is royally screwed touch screen scrolling.

Invalidate() is good in these cases, when you change some flag or value which affect the appearance and want to force repaint them. Otherwise, BB is good enough to handle these things on its own.

Tags: BlackBerry Developers

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