Java Reference
In-Depth Information
User Interface Extensions
Although PDAP and MIDP provide user interface APIs appropriate to the corresponding devices,
some extensions are available for both profiles.
For PDAP, kAWT provides some additional widgets such as a tabbed pane, a progress bar, and an
option dialog to overcome some of the limitations in the widget set of AWT when compared to
SWING.
Three different user interface extensions are available for MIDP. The
Open Windowing Toolkit
(OWT)
provides a set of simple lightweight widgets based on the MIDP Canvas class. OWT is
developed by DigitalFocus for Nextel and Motorola. Motorola itself provides a similar widget
toolkit called the
Lightweight Windowing Toolkit (LWT).
Unfortunately, LWT is available for
Motorola phones only. Finally, the kAWT toolkit provides an AWT subset on top of the MIDP
canvas toolkit.
Table 10.6
c
ontains a brief overview of the APIs available. As with the XML
parsers, there is a tradeoff between size and functionality.
Figure 10.5
shows the OWT Grass Seed
sample application;
Figure 10.6
shows the KawtDemo MIDlet.
Figure 10.5. The OWT Grass Seed example application.
Figure 10.6. The KawtDemo MIDlet.
T
a
ble 10.6. User Interface APIs Available for MIDP
Toolkit
JAR File
Size
Remarks
KAWT for
MIDP
75.4KB
AWT subset
Optional additional widgets such as
TabbedPane
and
ProgressBar
available
LWT
(native)
Native implementation available for Motorola Accompli phones only
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