Computer Science Wi-Fi App using J2ME and MVC Architecture

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Computer Science Wi-Fi App using J2ME and MVC
Architecture

• Advisor Dr. Chung-E Wang
• Department of Computer Science
• Sacramento State University
• Date 04/25/05

Praveen Chirumamilla
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Agenda

• Motivation
• Purpose
• J2ME
• MVC Pattern
• Project design overview
• Improvements
• Summary

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Motivation

• Semester begins check course schedule - Labs
  has long waiting lines
• out of town grade check no computer
• Why not use cell phone to do these..?

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Purpose

• Provide Students facility to schedule
  appointment, check their grades and class
  schedule using their cell phones
• Explore J2ME, NetBeans Mobile IDE
• Understand implement MVC architecture

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NetBeans

• Full-featured Java Open Source IDE
• Syntax highlighting code editor
• Offers unmatched support for J2ME MIDP 2.0 and
  CLDC 1.1 mobile environment
• J2EE development
• Performance Profiler
• Visual design tool
• Sun Public License

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Where does J2ME fit in Java 2 Platform?
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J2ME Configurations and Profiles
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Profile?

• A collection of Java technology-based APIs that
  supplement a Configuration to provide
  capabilities for a specific vertical market or
  device type
• Adds features that are specific to a certain
  device category such as cell phones or PDAs
• One profile defined
• Mobile Information Device Profile

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Mobile Information Device Profile

• Targets mobile two-way communication devices
  implementing J2ME CLDC
• Profile addresses
• Display toolkit, User input methods
• Persistent data storage using simple
  record-oriented database model
• HTTP-based networking using CLDC Generic
  Connection framework

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CLDC and MIDP Architecture
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MIDP Application Lifecycle

• MIDP applications are known as MIDlets
• MIDlets move from state to state in the
  lifecycle, as indicated.
• Start acquire resources and start executing
• Pause release resources and become quiescent
  (wait)
• Destroy release all resources, destroy threads,
  and end all activity

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MVC Model-View-Controller

• Model-View-Controller
• Architectural pattern for building systems
• Divide system responsibilities into three parts
• Model
• Contains all program data and logic
• View
• Visual representation of model
• Controller
• Defines system behavior by sending user input to
  model
• Step by step
• User uses controller to change data in model
• Model then informs view of change
• View changes visual presentation to reflect
  change

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Model-View-Controller Architecture

• Model
• Application data
• View
• Graphical presentation components
• Controller
• Logic for processing user input

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Elements of MVC design pattern
User
UI presentation
user actions
View
Controller
notifies of the update
changes and actions
registers
Model
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Project overview
View
MVCMIDlet
Runnable
Model
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Improvements

• Synchronize the data between SMCD and admissions
  department
• Send as SMS to students of the class when grades
  are posted

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Summary

• J2ME, MIDP, MVC Concepts
• Project design

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