Touch and trackball/trackpad input

Hello

I played around to try to make my first BlackBerry app. I wrote in Java before but nothing sophisticated and it was quite a long time ago. What I tried to do is trying to accept the user clicks anywhere on the screen with a touchscreen or by the click of the trackpad or trackball on that either. For example, I want to modify the application background color whenever the user tap the screen or click on the trackpad. What I have so far is the following:

final class ChangeBackground extends MainScreen{   private VerticalFieldManager _manager;

  ChangeBackground(TouchEvent message){     int eventCode = message.getEvent();       Background bg;

      _manager = (VerticalFieldManager)getMainManager();

      bg = BackgroundFactory.createSolidBackground(Color.RED);      _manager.setBackground(bg);

      if(eventCode == TouchEvent.UP){           bg = BackgroundFactory.createSolidBackground(Color.GREEN);            _manager.setBackground(bg);           bg = BackgroundFactory.createSolidBackground(Color.RED);          _manager.setBackground(bg);       } }}

Nothing happens when I try to touch the screen. Anyone can suggest a better api to use or a better method? I just want to be able to change constantly between red and green background whenever I have tap or click. I use JDK 5.0, but I am open to the use of 6.0.

Thanks in advance for any help

This menu is coming in response to UNCLICK - override to return true and you're all set. Same thing can be said about navigationUnclick() (in fact, if you override navigationUnclick(), you won't have to bother with TouchEvent.UNCLICK).

If it is a button that is causing problems, create it with ButtonField.CONSUME_CLICK to prevent that this menu popping up.

Tags: BlackBerry Developers

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I have known that using touchevent for touchscreen and trackwheelClick for the trackball.

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These two make no sense at all - either treat CLICK or UNCLICK because otherwise you will push the screen twice.

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