在HorizontalFieldManager中使用FIELD_BOTTOM的黑莓探测器

Question

我正在尝试实现一个如下所示的屏幕：

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为此，我使用以下代码。它根本不起作用。

HorizontalFieldManager outerManager = new HorizontalFieldManager(FIELD_BOTTOM|USE_ALL_HEIGHT);
        outerManager.setBackground(BackgroundFactory.createBitmapBackground(Bitmap.getBitmapResource("img/bghome.png")));

final FCLabelField selectedLabel = new FCLabelField("Hello World", LabelField.USE_ALL_WIDTH | DrawStyle.HCENTER);

selectedLabel.setFontColor(Color.BLACK);
selectedLabel.setBackground(BackgroundFactory.createSolidBackground(0x00cccccc));
outerManager.add(selectedLabel);

HorizontalFieldManager innerManager = new HorizontalFieldManager();

innerManager.setPadding(0, 10, 0, 10);


innerManager.add(new ButtonField( "Button 1", ButtonField.CONSUME_CLICK | ButtonField.FIELD_RIGHT ));
innerManager.add(new ButtonField( "Button 2", ButtonField.CONSUME_CLICK | ButtonField.FIELD_RIGHT ));
innerManager.add(new ButtonField( "Button 3", ButtonField.CONSUME_CLICK | ButtonField.FIELD_RIGHT ));
innerManager.add(tab4);
innerManager.add(tab5);

outerManager.add(innerManager);

innerManager.setBackground(BackgroundFactory.createSolidBackground(0x00cccccc));

add(outerManager);

我的代码中有什么问题？我怎样才能像上面那样设置一个屏幕？

Answer 1

有几种方法可以实现你所要求的。一种方法是按照BBdev的建议使用setStatus()方法(它只适用于MainScreen类型的屏幕，而不适用于FullScreen类型的屏幕)。另一种选择是手动对齐底部。

需要记住的重要对齐规则：

• HorizontalFieldManager只能垂直对齐字段。将字段添加到水平管理器时，只有以下对齐样式有效: FIELD_TOP、FIELD_VCENTER、FIELD_BOTTOM。
• VerticalFieldManager只能水平对齐域。向垂直字段管理器添加字段时，只有以下对齐样式有效: FIELD_LEFT、FIELD_HCENTER、FIELD_RIGHT。

下面是一段代码片段，它可以完成您所要求的操作。

public class UISandbox extends MainScreen {
    public UISandbox() {
        super(NO_VERTICAL_SCROLL | NO_HORIZONTAL_SCROLL | USE_ALL_HEIGHT | USE_ALL_WIDTH);

        HorizontalFieldManager outerManager = new HorizontalFieldManager(USE_ALL_HEIGHT);
        outerManager.setBackground(BackgroundFactory.createBitmapBackground(Bitmap.getBitmapResource("img/bghome.png")));

        VerticalFieldManager innerMngr = new VerticalFieldManager(USE_ALL_WIDTH | FIELD_BOTTOM); 
        final LabelField selectedLabel = new LabelField("Hello World", FIELD_HCENTER) {
            protected void paint(Graphics g) {
                g.setColor(Color.BLACK);
                super.paint(g);
            }
        };
        selectedLabel.setBackground(BackgroundFactory.createSolidBackground(0x00cccccc));
        innerMngr.add(selectedLabel);

        GridFieldManager innerInnerMngr = new GridFieldManager(1, 3, USE_ALL_WIDTH);
        innerInnerMngr.setPadding(10, 0, 10, 0);
        innerInnerMngr.setColumnProperty(0, GridFieldManager.AUTO_SIZE, 0);
        innerInnerMngr.setColumnProperty(1, GridFieldManager.AUTO_SIZE, 0);
        innerInnerMngr.setColumnProperty(2, GridFieldManager.AUTO_SIZE, 0);
        innerInnerMngr.add(new ButtonField("Button 1", ButtonField.CONSUME_CLICK | FIELD_HCENTER));
        innerInnerMngr.add(new ButtonField("Button 2", ButtonField.CONSUME_CLICK | FIELD_HCENTER));
        innerInnerMngr.add(new ButtonField("Button 3", ButtonField.CONSUME_CLICK | FIELD_HCENTER));

        innerMngr.add(innerInnerMngr);
        outerManager.add(innerMngr);
        add(outerManager);
    }
}

Answer 2

尝试在一个HorizontalFieldManager中添加所有按钮，并使用setStatus(添加按钮的hfmInwhich )。这将设置屏幕底部的按钮。并在setStatus之前添加labelField Hello world。就是这样。:)