Question

我正在尝试为黑莓创建自定义对话框...

public class cusDialog extends Screen implements FieldChangeListener {

    private cusButtField okButton;

    protected void paintBackground(Graphics graphics) {   /// this doesn't seem to work.
        graphics.setColor(0x999966);                       /// should I somehow call it?
        graphics.fillRoundRect(0, 0, getWidth(), getHeight(), 12, 12);
        graphics.setColor(Color.BLACK);
        graphics.drawRoundRect(0, 0, getWidth(), getHeight(), 12, 12);
        }

    public cusDialog(String message) {
        super(new VerticalFieldManager(), Screen.DEFAULT_CLOSE);
        try {
        FontFamily alphaSansFamily = FontFamily.forName("BBAlpha Serif");
        Font appFont = alphaSansFamily.getFont(Font.PLAIN, 9, Ui.UNITS_pt);
        setFont(appFont);
        } catch (ClassNotFoundException e) {
        }
        add(new LabelField(message));
        add(new SeparatorField());
        okButton = new cusButtField("OK", Color.WHITE, Color.LIGHTGREY, Color.YELLOW, Color.GREEN,Field.FIELD_HCENTER);
        okButton.setChangeListener(this);
        add(okButton);
        }

    protected void sublayout(int width, int height) {
        layoutDelegate(width - 80, height - 80);
        setPositionDelegate(10, 10);
        setExtent(width - 60, Math.min(height - 60, getDelegate().getHeight() + 20));
        setPosition(30, (height - getHeight())/2);
        }

    public void fieldChanged(Field field, int context) {
        if (field == okButton) {
        close();
        }
        }


}

但上面的“paintBackground”部分不起作用，即对话框出现在白色背景上。如果我以某种方式调用此方法，您认为可能是错的？我应该放在其他地方吗？

谢谢！

Answer 1

我刚才在JDE 4.5上遇到过同样的问题。正如here (Blackberry-KB)所述，下面的代码对我有用。

public void paint(Graphics graphics)
{
    graphics.setBackgroundColor(Color.DARKRED);
    graphics.clear();
    super.paint(graphics);
}

另外，您可能需要查看this问题。

paintBackground不知何故现在愿意工作

1 个答案: