Java Reference
In-Depth Information
MIDP-Specific Packages
The MIDP-specific packages
javax.microedition.lcdui
,
javax.microedition.midlet
, and
javax.microedition.rms
are described in the
following sections.
The
javax.microedition.lcdui
Package
This package provides a set of features for implementation of user interfaces for MIDP applications.
Interfaces
Choice
The
Choice
interface defines methods for UI components
implementing the capability of selecting elements from a predefined
n
umber of elements.
CommandListener
The
CommandListener
interface defines methods that are used by
applications that want to receive high-level commands from the UI
i
mplementation.
ItemStateListener
The
ItemStateListener
interface defines methods that are used
by applications that want to receive events that indicate changes in
the internal state of the interactive items within a
Form
screen.
Classes
Alert
The
Alert
class provides a screen that shows data to the user and waits for
a
specified period of time before proceeding to the next screen.
AlertType
The
AlertType
class provides an indication of the behavior of alerts.
Canvas
The
Canvas
class is the base class for writing applications that need to
handle low-level events and to issue graphics calls for drawing to the display
at low-level.
ChoiceGroup
The
ChoiceGroup
class is a group of selectable elements that needs to be
a
ppended to a
Form
.
Command
The
Command
class encapsulates the semantic information of an action.
DateField
The
DateField
class provides a UI component for editing date and time
information. This UI component needs to be appended to a
Form
.
Display
The
Display
class represents the manager of the display and input devices
o
f the system.
Displayable
The
Displayable
class encapsulates an object that has the capabilities to
b
e placed on the
Display
.
Font
The
Font
class represents a font and font metrics.
Form
The
Form
class is a
Screen
that contains an arbitrary mixture of all available
h
igh-level UI components.
Gauge
The
Gauge
class represents a bar graph display of a value that needs to be
p
laced in a
Form
.
Graphics
The
Graphics
class provides simple 2D geometric rendering in the low-level
API.
Image
The
Image
class is used to hold image data.
ImageItem
The
ImageItem
class provides layout functionality for images that need to be
p
laced in a
Form
or
Alert
.
Item
The
Item
class is the superclass of all UI components that can be appended
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