使 RichTextField 在 Blackberry 中水平居中

Question

我当前的主屏幕看起来像：

当前每一行显示的代码是这样的：

    RichTextField WeFix1 = new RichTextField("• Computer & Laptop", RichTextField.TEXT_JUSTIFY_HCENTER);

    VFMTitle1 = new VerticalFieldManager(Field.USE_ALL_WIDTH| Field.NON_FOCUSABLE);

    HFMTitle1 = new HorizontalFieldManager(FIELD_HCENTER);

    HFMTitle1.add(WeFix1);

  VFMTitle1.add(HFMTitle1);
add(VFMTitle21);

但需要定位在一条直线上：

Answer 1

有很多可能性。您可以调整包含服务列表的容器的边距。此外，您还可以自定义字段管理器等等。

选项 1：调整边距

VerticalFieldManager vfmServices = new  VerticalFieldManager(VerticalFieldManager.USE_ALL_WIDTH);

vfmServices.add(new RichTextField("• Computer & Laptop"));
vfmServices.add(new RichTextField("• Modem / Router / Switches"));
vfmServices.add(new RichTextField("• Printer / Scanner"));
vfmServices.add(new RichTextField("• Tablet"));

final int horizontalMargin = 30;
vfmServices.setMargin(0, horizontalMargin, 0, horizontalMargin);

add(vfmServices);

选项 2：使用自定义字段管理器

VerticalFieldManager vfmServiceLists = new VerticalFieldManager(VerticalFieldManager.USE_ALL_WIDTH);

vfmServiceLists.add(new RichTextField("• Computer & Laptop"));
vfmServiceLists.add(new RichTextField("• Modem / Router / Switches"));
vfmServiceLists.add(new RichTextField("• Printer / Scanner"));
vfmServiceLists.add(new RichTextField("• Tablet"));

Manager mListContainer = new Manager(Manager.USE_ALL_WIDTH) {

    final int horizontalMargin = 30;

    protected void sublayout(int width, int height) {
        // this manager designed to contain only one list container.
        if (getFieldCount() == 1) {
            Field child = getField(0);
            layoutChild(child, width - 2 * horizontalMargin, height);
            // adjust manager height.
            height = child.getHeight();
            setPositionChild(child, horizontalMargin, 0);
        }

        setExtent(width, height);       
    }           
};

mListContainer.add(vfmServiceLists);
add(mListContainer);

[稍后添加]

正如alishaik786在评论中建议的那样，如果您使用LabelField而不是RichTextField，您可以检查以下代码，该代码不使用任何边距：

VerticalFieldManager vfmServiceLists = new VerticalFieldManager();

vfmServiceLists.add(new LabelField("• Computer & Laptop"));
vfmServiceLists.add(new LabelField("• Modem / Router / Switches"));
vfmServiceLists.add(new LabelField("• Printer / Scanner"));
vfmServiceLists.add(new LabelField("• Tablet"));

Manager mListContainer = new Manager(Manager.USE_ALL_WIDTH) {
    protected void sublayout(int width, int height) {
        // this manager designed to contain only one list container.
        if (getFieldCount() == 1) {
            Field child = getField(0);
            layoutChild(child, width, height);
            // adjust manager height.
            height = child.getHeight();
            setPositionChild(child, (width - child.getWidth()) / 2, 0);
        }

        setExtent(width, height);       
    }           
};

mListContainer.add(vfmServiceLists);
add(mListContainer);

Answer 2

最好使用 LabelField 而不是 RichTextField。 如果您只希望 RichTextField 上的结果，则以下代码不适合您；然后尝试使用我们的“Rupak”代码；

以下代码使用 LabelField 而不是 RichTextField；

public class Abc extends MainScreen
{
VerticalFieldManager vertical;
Font font=Font.getDefault().derive(Font.BOLD, 18),small_font=Font.getDefault().derive(Font.PLAIN, 15);
LabelField labelField,labelFieldTwo;
public Abc() 
{
    createGUI();
}

private void createGUI() 
{
    vertical=new VerticalFieldManager(USE_ALL_WIDTH);
    vertical.setBackground(BackgroundFactory.createSolidBackground(Color.GREEN));
    HorizontalFieldManager hor=new HorizontalFieldManager(Field.FIELD_HCENTER);     

    hor.add(new LabelField(" We Fix ", Field.NON_FOCUSABLE));
    hor.setFont(font);
    hor.setPadding(5, 0, 5, 0);
    vertical.add(hor);

    HorizontalFieldManager hr=new HorizontalFieldManager(Field.FIELD_HCENTER);

    hr.add(new LabelField("."));        
    hr.add(new LabelField("Computer Science & Laptop", Field.NON_FOCUSABLE));
    hr.setFont(small_font);
    vertical.add(hr);

    HorizontalFieldManager hr1=new HorizontalFieldManager(Field.FIELD_HCENTER);

    hr1.add(new LabelField("."));       
    hr1.add(new LabelField("Modem/Router/Switches", Field.NON_FOCUSABLE));
    hr1.setFont(small_font);
    vertical.add(hr1);

    //------------------- Up to now you want like this; and you can do like this type also like left align and right align;
    HorizontalFieldManager hr2=new HorizontalFieldManager(Field.FIELD_LEFT);

    hr2.add(new LabelField("."));       
    hr2.add(new LabelField("Printer/Scanner", Field.NON_FOCUSABLE));
    hr2.setFont(small_font);
    vertical.add(hr2);

    HorizontalFieldManager hr3=new HorizontalFieldManager(Field.FIELD_LEFT);

    hr3.add(new LabelField("."));       
    hr3.add(new LabelField("Tablet", Field.NON_FOCUSABLE));
    hr3.setFont(small_font);
    vertical.add(hr3);

    HorizontalFieldManager hr4=new HorizontalFieldManager(Field.FIELD_RIGHT);

    hr4.add(new LabelField("."));       
    hr4.add(new LabelField("Printer/Scanner", Field.NON_FOCUSABLE));
    hr4.setFont(small_font);
    vertical.add(hr4);

    HorizontalFieldManager hr5=new HorizontalFieldManager(Field.FIELD_RIGHT);

    hr5.add(new LabelField("."));       
    hr5.add(new LabelField("Tablet", Field.NON_FOCUSABLE));
    hr5.setFont(small_font);
    vertical.add(hr5);

    vertical.setPadding(0, 0, 10, 0);
    add(vertical);
}
}

当字段对齐居中、左右时，我得到了这样的结果：

Answer 3

试试这个..

LabelField lbl=new LabelField("• Computer & Laptop\r\n• Modem / Router / Switches\r\n• 
Printer / Scanner\r\n• Tablet",LabelField.FIELD_HCENTER);