Question

Currently I have 4 bitmap buttons in my application. I want to have something like Label/Name for each of the buttons so that whenever someone focus on the particular button, the name appears somewhere on the screen. It could be on top, below the buttons or anywhere will do.

How can I do this? I tried searching for bitmap button field labelling but I found nothing really helpful.

Answer 1

you can put a CustomLabelField below button fields. Override your ButtonFields onFocus(int direction) and onUnfocus() methods. Inside them invoke setLabel(String label) method of your CustomLabelField

class CustomLabelField extends Field {
    String label;
    public void setLabel(String label){
        this.label = label;
        invalidate();
    }
    protected void layout(int arg0, int arg1) {
        setExtent(Display.getWidth, getFont().getHeight());
    }

    protected void paint(Graphics graphics) {
        graphics.setColor(Color.Black);
        graphics.drawText(label, 0, 0);
    }
}

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EDIT (after comments)

You can use this custom button and add your additional features in it. I did not try if this is working, but should work.

import net.rim.device.api.ui.component.BitmapField;
import net.rim.device.api.ui.container.MainScreen;

public class CustomButtonField extends BitmapField{
    private String label = "";
    private MainScreen yourScreen;

    public CustomButtonField(String label, MainScreen yourScreen) {
        super();
        this.label = label;
        this.yourScreen = yourScreen;
    }

    protected void onFocus(int direction) {
        yourScreen.setTitle(label);
        super.onFocus(direction);
    }

    protected void onUnfocus() {
        yourScreen.setTitle("");
        super.onUnfocus();
    }
}