Paint using the interface user of BB

Hello. I am trying to create a simple application that draw things on the screen. If I do the drawing within the method paint (Graphics graphics) everything works fine, but if I try to do it in another way outside the paint, it won't work at all, the screen remains white. Here is the code:

public class blackberryApp extends UiApplication {    public static void main(String[] args) {        blackberryApp theApp = new blackberryApp();        theApp.enterEventDispatcher();    }

    public blackberryApp() {        //display a new screen        GameScreen Game = new GameScreen();        Game.start();        pushScreen(Game);    }}

public class GameScreen extends FullScreen implements Runnable {        public Graphics theGraphics;    public GameScreen() {        super();    }    public void start() {        theGraphics = getGraphics();        mainThread = new Thread(this);        mainThread.start();    }    public void paint(Graphics graphics) {    }    public void draw() {        if (theGraphics != null) {            theGraphics.pushRegion(new XYRect(0, 0, 240, 260));            theGraphics.setColor(Graphics.BLACK);            theGraphics.setColor(0x00FF00);            theGraphics.fillRect(50, 50, 30, 30);            theGraphics.setColor(Graphics.WHITE);            theGraphics.drawText("It works", 20, 20);            theGraphics.popContext();        }    }    public final void run() {        while (true) {            draw();            invalidate();            try {            Thread.sleep(100);            } catch (Exception e)            {            }        }    }}

The user of BB interface supports double-buffering, or I have to create an auxiliary buffer to draw inside first and then draw the buffer to the screen in the paint method? Maybe I should do "theGraphics = getGraphics()" somewhere else, like before I got a call to the draw() method?

Thank you for your response. I made the change for the blackberryApp class constructor and it works fine:

    public blackberryApp() {        //display a new screen        super();        GameScreen Game = new GameScreen();        pushScreen(Game);        Game.start();    }

But I have not used "invokeLater", I left the code as it was before, by calling the draw() method in the run() method of the thread and it works. I also added this.updateDisplay () after draw(). After reading the documentation of the API, I thought that invalidate() does the same thing as flushGraphics() in GameCanvas, but without doubt, I was wrong, because I removed it from the code and the design is still ok, can you tell me where it should be used? Thank you for your help.

Tags: BlackBerry Developers

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