1. Developing Software for Wireless Devices
Robert Hatch
Sean Meredith
James Pate Williams, Jr.

2. Overview Sun Java SDK 1.3 Forte Sun Java Micro Edition
Packages of MIDP

3. Desirable Software Components
Sun Java 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

4. 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

5. Sun Forte 3.0 Integrated Development Environment for Java programming
comparable to Borland’s JBuilder 5.0
constructed using Java
a resource hog

6. Sun Java2 ME Wireless Toolkit
Version 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

7. Wireless Toolkit The toolkit includes the following emulators:
default grey phone
minimum phone
Motorola i85s
Palm OS device
RIM Java handheld

8. Wireless Toolkit
The emulators can function fairly closely to read devices in terms of the GUIs that they offer.

9. Java Mobile Information Device Profile (MIDP)
Consists of five packages:
user interface package
persistence package
application lifecycle package
networking package
core packages

10. 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

11. User Interface Package: Common GUI Elements
Alert
Canvas
Command
ChoiceGroup
DateField
Display
Font
Form
Gauge
Graphics
Image
Item
List
Screen
Ticker

12. Persistence Package Components Associated class RecordComparator
RecordEnumeration
RecordFilter
RecordListener
Associated class
RecordStore - a class representing a record store

13. 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

14. MIDlet Life Cycle

15. Networking Package Components Connection ContentConnection Datagram
DatagramConnection
HttpConnection
InputConnection

16. Networking Package Components Associated class OutputConnection
StreamConnection
StreamConnectionNotifier
Associated class
Connector - placeholder for the static methods that are used for creating all the Connection jobs.

17. 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

18. 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

19. Core Packages
java.io
java.lang
java.util

20. 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

21. Demo