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
