Java Reference
In-Depth Information
public void add_location( String l ) {
String locations[];
int i;
try {
locationStore.addLocation( new Location( l, "" ));
locationList = null;
} catch (Exception e) {
getDisplay().setCurrent(get_cannotAddLocationAlert(),
get_locationList());
}
// Refresh the location list lazily.
}
Showing an
Alert
is a little different than showing other
Displayable
s, because you
need to specify the
Displayable
that the screen should show after showing the
Alert
.
Consequently, you use the
Display.setCurrent
method, which takes both an
Alert
and
a subsequent form, like this:
Display.getDisplay().setCurrent( alert, nextForm );
Interestingly, you can set your own
CommandListener
on an
Alert
using
setCommandListener
, but be careful if you do: it disables the autoadvance feature that
takes the screen to the next
Displayable
either when the user dismisses the
Alert
or
its timer expires. To restore this functionality, just set a
CommandListener
of
null
.
The Alert
class
has the usual gamut of accessor and mutator methods you'd expect,
including the following:
•
setTimeout
and
getTimeout
: Set and get the time-out until the
Alert
transitions to
the next
Displayable
•
setImage
and
getImage
: Set and get the
Image
instance displayed by the
Alert
•
setString
and
getString
: Set and get the string (not the title!) displayed by the
Alert
•
setIndicator
and
getIndicator
: Set and get the gauge displayed by the
Alert
■
Tip
If you set a
Gauge
for an
Alert
, it must be noninteractive, not owned by another
Displayable
, and
not have any commands or label, and its layout value must be
LAYOUT_DEFAULT
.
