March 2002
Intermediate to advanced
480 pages
18h 40m
English
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Name
List
Synopsis
List presents a list of alternatives
to the user and allows one or more of them to be selected. Most of the
methods of the List class are implementations of those
specified by the Choice interface, which it implements, and
are described in the reference entry for Choice. Since
List is derived from Screen, it occupies
the entire screen of the device and, unlike ChoiceGroup,
cannot appear together with other controls.
A List can be constructed in Choice.EXCLUSIVE
mode, when it behaves as a group of radio buttons, in Choice.MULTIPLE
mode when it acts like a collection of check boxes or in Choice.IMPLICIT
mode, which is usually used to create a full-screen menu. Both IMPLICIT and
EXCLUSIVE modes allow only one entry in the LIST
to be selected at any given time. The difference between these modes is the way they handle event notification as described below.
At any given time, one entry in the List control has the
input focus. The user can move the focus to any entry in the list using keys on the keypad
or the pointer, depending on the platform. The entry with the input focus will be highlighted
in some way to distinguish it from the other entries and its state can be toggled between
selected and unselected using a platform-dependent gesture.
Unlike ChoiceGroup, a List is not associated with
an ItemStateListener because it is not an Item.
How the application is made aware of selection changes depends on the mode.
In MULTIPLE and EXCLUSIVE modes, selection changes ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.