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Home/ Questions/Q 7030697
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Editorial Team
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Editorial Team
Asked: May 28, 20262026-05-28T00:42:21+00:00 2026-05-28T00:42:21+00:00

I have defined a BitmapButtonField in Blackberry. But the default grey color background does

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I have defined a BitmapButtonField in Blackberry. But the default grey color background does not go. And the Bluish onFocus border?
How to change them in BB 4.5

enter image description here

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  1. Editorial Team
    Editorial Team
    2026-05-28T00:42:21+00:00Added an answer on May 28, 2026 at 12:42 am

    Hi this is bitmap button and background color Red

    manager=new Field(Field.FOCUSABLE){
                    protected void onFocus(int direction) {
                        super.onFocus(direction);
                        flag1=true;
                        invalidate();
                    }
                    protected void onUnfocus() {
                        flag1=false;
                        invalidate();
    
                    }
                    protected void layout(int width, int height) {
                        setExtent(image.getWidth(),image.getHeight());
                    }
                    protected void paint(Graphics graphics) {
                        if(flag1){
                            graphics.setBackgroundColor(Color.RED);
                            graphics.clear();
                            graphics.drawBitmap(0, 0, image.getWidth(),image.getHeight(), image_hover,0,0);
                        }else{
                            graphics.drawBitmap(0, 0, image.getWidth(),image.getHeight(), image,0,0);
                        }
                    }
                    protected boolean navigationClick(int status, int time) {
                        fieldChangeNotify(1);
                        return true;
                    }
                };
                manager.setChangeListener(this);
                add(manager);
    

    output as following image
    enter image description here
    This is background image and with default background color

    manager1=new Field(Field.FOCUSABLE){
                    protected void onFocus(int direction) {
                        super.onFocus(direction);
                        flag2=true;
                        invalidate();
                    }
                    protected void onUnfocus() {
                        button=image;
                        flag2=false;
                        invalidate();
    
                    }
                    protected void layout(int width, int height) {
                        setExtent(image.getWidth(),image.getHeight());
                    }
                    protected void paint(Graphics graphics) {
                        if(flag2)
                            graphics.drawBitmap(0, 0, image.getWidth(),image.getHeight(), image_hover,0,0);
                            else
                            graphics.drawBitmap(0, 0, image.getWidth(),image.getHeight(), image,0,0);
                    }
                    protected boolean navigationClick(int status, int time) {
                        fieldChangeNotify(1);
                        return true;
                    }
                };
                manager1.setChangeListener(this);
                add(manager1);
    

    out put as followingenter image description here

    Fully functional class is following for better understanding

    import net.rim.device.api.system.Bitmap;
    import net.rim.device.api.ui.Color;
    import net.rim.device.api.ui.Field;
    import net.rim.device.api.ui.FieldChangeListener;
    import net.rim.device.api.ui.Graphics;
    import net.rim.device.api.ui.UiApplication;
    import net.rim.device.api.ui.component.Dialog;
    import net.rim.device.api.ui.container.MainScreen;
    
    public class StartUp extends UiApplication{
        public static void main(String[] args) {
            StartUp up=new StartUp();
            up.enterEventDispatcher();
        }
        public StartUp()
        {
            pushScreen(new Demoscreen());
        }
        class Demoscreen extends MainScreen implements FieldChangeListener
        {
            Bitmap image,image_hover;
            boolean flag1,flag2;
            Field manager=null,manager1=null;
            public Demoscreen() {
                image=Bitmap.getBitmapResource("Download_48x48.png");
                image_hover=Bitmap.getBitmapResource("Download_48x48.png");
                manager=new Field(Field.FOCUSABLE){
                    protected void onFocus(int direction) {
                        super.onFocus(direction);
                        flag1=true;
                        invalidate();
                    }
                    protected void onUnfocus() {
                        flag1=false;
                        invalidate();
    
                    }
                    protected void layout(int width, int height) {
                        setExtent(image.getWidth(),image.getHeight());
                    }
                    protected void paint(Graphics graphics) {
                        if(flag1){
                            graphics.setBackgroundColor(Color.RED);
                            graphics.clear();
                            graphics.drawBitmap(0, 0, image.getWidth(),image.getHeight(), image_hover,0,0);
                        }else{
                            graphics.drawBitmap(0, 0, image.getWidth(),image.getHeight(), image,0,0);
                        }
                    }
                    protected boolean navigationClick(int status, int time) {
                        fieldChangeNotify(1);
                        return true;
                    }
                };
                manager.setChangeListener(this);
                add(manager);
                manager1=new Field(Field.FOCUSABLE){
                    protected void onFocus(int direction) {
                        super.onFocus(direction);
                        flag2=true;
                        invalidate();
                    }
                    protected void onUnfocus() {
                        flag2=false;
                        invalidate();
                    }
                    protected void layout(int width, int height) {
                        setExtent(image.getWidth(),image.getHeight());
                    }
                    protected void paint(Graphics graphics) {
                        if(flag2)
                            graphics.drawBitmap(0, 0, image.getWidth(),image.getHeight(), image_hover,0,0);
                            else
                            graphics.drawBitmap(0, 0, image.getWidth(),image.getHeight(), image,0,0);
                    }
                    protected boolean navigationClick(int status, int time) {
                        fieldChangeNotify(1);
                        return true;
                    }
                };
                manager1.setChangeListener(this);
                add(manager1);
            }
            public void fieldChanged(Field field, int context) {
                if(field==manager)
                {
                    displayDialog("I am first field");
                }else if(field==manager1)
                {
                    displayDialog("I am second  field");
                }
    
            }
            public void displayDialog(final String message)
            {
                UiApplication.getUiApplication().invokeLater(new Runnable() {
                    public void run() {
                        Dialog.inform(message);
                    }
                });
            }
        }
    }
    

    For more details please visit following link for BackgroundsBackground logic for 4.5 OS

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