Create Transparent Mainscreen in Blackberry

问题

i want to create a type of MainScreen in my Blackberry app which should be Transparen/Translucent. I tried with following code on MyCustomMainScreen's constructor but it still shows a white screen

Background bg = BackgroundFactory.createSolidTransparentBackground(Color.BLACK, 50);
this.setBackground(bg);

I have read in the forum and also tested it for popup screens and it works fine with them but fails with mainscreens. Does anyone have any idea how to achieve this for MainScreen..?

-Big O

回答1:

override the paint method like:

class M extends MainScreen
{
        public M() 
        {
            setBackground(BackgroundFactory.createSolidTransparentBackground(Color.ANTIQUEWHITE, 100));
            LabelField l=new LabelField("hello");
            add(l);
        }
        protected void paint(Graphics graphics) 
        {
            super.subpaint(graphics);
        }
  }

回答2:

Instead of

Background bg = BackgroundFactory.createSolidTransparentBackground(Color.BLACK, 50);
this.setBackground(bg);

maybe better

Background bg = BackgroundFactory.createSolidTransparentBackground(Color.BLACK, 50);
getMainManager().setBackground(bg);

回答3:

I found the solution without overriding the paint method. You need to set the background full transparent for the Screen and translucent for the main manager:

// Full transparent background
setBackground(BackgroundFactory.createSolidTransparentBackground(0, 0));

// Manager translucent background
getMainManager().setBackground(BackgroundFactory.createSolidTransparentBackground(Color.BLACK, 50));

来源：https://stackoverflow.com/questions/6659649/create-transparent-mainscreen-in-blackberry

标签

blackberry