Lists and Forms - Beginning J2ME: From Novice to Professional - page 79

To create an ImageItem , just supply the Image that is to be displayed, the label, layout, and
alternate text.
Layout is controlled with the layout constants in the Item class. ImageItem also defines
constants for the layout parameter. One way to control the layout is to specify the default value,
LAYOUT_DEFAULT . If you need more control, combine a horizontal value with a vertical value.
The horizontal values are LAYOUT_LEFT , _ LAYOUT_CENTER , and LAYOUT_RIGHT . The vertical values
are LAYOUT_NEWLINE_BEFORE and LAYOUT_NEWLINE_AFTER . The constants in the ImageItem class
are present mainly for backward compatibility with older MIDP versions.
ImageItem supports appearance modes just like StringItem . ItemItem includes a constructor
that allows you to set the appearance mode.
Figure 6-8 shows a form containing a single ImageItem .
Figure 6-8. An ImageItem
DateField
DateField is an extremely handy mechanism by which users can enter dates, times, or both. It's
up to the implementation to determine some reasonable way for users to enter dates and times;
you, as the MIDlet programmer, simply use DateField and not worry about the
implementation.
To create a DateField , specify a label and a type. Three constants in the DateField class
describe the different types:
• DATE displays an editable date.
• TIME displays an editable time.
• DATE_TIME displays both a date and a time.
DateField provides two constructors. The first uses the default time zone, while the second
allows you to specify a TimeZone explicitly:
public DateField(String label, int mode)
public DateField(String label, int mode, TimeZone timeZone)