Developing Software for Wireless
Devices
Robert Hatch
Sean Meredith
James Pate Williams, Jr.
Overview
•
Sun Java SDK 1.3
•
Forte
•
Sun Java Micro Edition
•
Packages of MIDP
Desirable Software Components
•
Sun Java 1.3.1+ Software Development Kit
•
Sun Forte 3.0 Integrated Development
Environment
•
Sun Java 2 Micro Edition Wireless Toolkit
•
All are freely downloadable from Sun and
require at least a 450 MHz Pentium II with
128 MB of RAM
Sun Java 2 SDK 1.3
•
Improvements
–
more robust than previous Java SDKs
–
sound API that includes a MIDI synthesizer and
sequencer
–
support for the Java 2 Micro Edition Wireless
Toolkit
Sun Forte 3.0
•
Integrated Development Environment for
Java programming
•
comparable to Borland’s JBuilder 5.0
•
constructed using Java
•
a resource hog
Sun Java2 ME Wireless Toolkit
•
Version 1.0.3 can be used either in
integrated mode with Forte 3.0 or as a stand
alone product.
•
The integrated version is easier for code
development and testing
•
The Wireless Toolkit implements a Mobile
Information Device Profile (MIDP) for
some common wireless devices
Wireless Toolkit
•
The toolkit includes the following
emulators:
–
default grey phone
–
minimum phone
–
Motorola i85s
–
Palm OS device
–
RIM Java handheld
Wireless Toolkit
•
The emulators can function fairly closely to
read devices in terms of the GUIs that they
offer.
Java Mobile Information Device
Profile (MIDP)
•
Consists of five packages:
–
user interface package
–
persistence package
–
application lifecycle package
–
networking package
–
core packages
User Interface Package
•
Listener interfaces
–
ChoiceAPI
–
CommandListener
–
ItemStateListener
•
Buttons
–
defined as commands
–
actions can be captured by implementing the
CommandListener interface, e.g. by defining
the commandAction method
User Interface Package:
Common GUI Elements
•
Alert
•
Canvas
•
Command
•
ChoiceGroup
•
DateField
•
Display
•
Font
•
Form
•
Gauge
•
Graphics
•
Image
•
Item
•
List
•
Screen
•
Ticker
Persistence Package
•
Components
–
RecordComparator
–
RecordEnumeration
–
RecordFilter
–
RecordListener
•
Associated class
–
RecordStore
-
a class representing a record
store
Application Lifecycle Package
•
Defines Mobile Information Device Profile
applications and interactions between the
application and the environment in which
the application runs
•
Class associated
–
MIDlet
-
MIDP application on the device
•
States
–
Paused
–
Active
–
Destroyed
MIDlet Life Cycle
Networking Package
•
Components
–
Connection
–
ContentConnection
–
Datagram
–
DatagramConnection
–
HttpConnection
–
InputConnection
Networking Package
•
Components
–
OutputConnection
–
StreamConnection
–
StreamConnectionNotifier
•
Associated class
–
Connector
-
placeholder for the static methods
that are used for creating all the Connection
jobs.
Networking Package
•
Support for stream connections (TCP/IP)
and datagram connections (UDP/IP)
–
TCP/IP
-
connection
-
oriented protocol; reliable
and in
-
order delivery of packets
–
UDP/IP
-
connectionless
-
oriented protocol;
unreliable and possibly out
-
of
-
order delivery of
packets
Networking Package (Cont.)
•
Some wireless devices such as Palm OS
devices do not offer the datagram protocol
and only use stream connections
•
Java MIDP supports HTTP connections
•
TCP/IP networking is fairly straightforward
and only requires a few lines of code to
implement
Core Packages
•
java.io
•
java.lang
•
java.util
Wireless Device Software
Development Steps
•
Create a MIDlet suite template using Forte 3.0
•
Fill in the MIDlet details to incorporate desired
functionality
•
Execute code on various emulators; the same
code behaves differently on distinct platforms
•
Port code to desired device
•
Test on an actual wireless device
Demo
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