Making the RichTextField Horizontally Centered in Blackberry

问题

My current Mainscreen looks like :

The current code for each line of display is like:

    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);

But need to it be positioned in a straight line :

回答1:

There are many possibilities. You can adjust the margin of the container that holds list of services. Also you can make your custom field manager, and many more.

Option 1: Adjusting margin

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);

Option 2: Using a custom field Manger

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);

[Added Later]

As alishaik786 suggested in comment, if you use LabelField instead of RichTextField, you can check following code, which doesn't use any margin:

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);

回答2:

Better to use LabelField instead of RichTextField. If you want the result on only RichTextField the below code is not suit for you; Then try to use our "Rupak" code;

This below code uses LabelField instead of 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);
}
}

I got like this when field align center, right and left:

回答3:

Try this..

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

来源：https://stackoverflow.com/questions/8810304/making-the-richtextfield-horizontally-centered-in-blackberry