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The J2ME Development Environment

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J2ME Java 2 Micro Edition. Introduced by sun in 1999 for mobile devices ... KVM - Kilobyte Virtual Machine. 40 80 KB in size ... – PowerPoint PPT presentation

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Title: The J2ME Development Environment


1
The J2ME Development Environment
  • Shwetak Patel
  • shwetak_at_cc.gatech.edu

2
Intro to J2ME
  • J2ME Java 2 Micro Edition
  • Introduced by sun in 1999 for mobile devices
  • Scaled down version of J2SE
  • Smaller footprint
  • No heavyweight classes (swing, awt, etc)
  • Highly optimized runtime environment

3
J2ME Architecture
OEM Specific API
  • KVM - Kilobyte Virtual Machine
  • 40 80 KB in size
  • For devices with 160 KB of memory and 16 or
    32-bit RISC/CISC microprocessors

4
J2ME Architecture (cont.)
OEM Specific API
  • CLDC - Connected Limited Device Configuration
  • Provides core lower level functionality
  • Bare minimum IO and utilities
  • Currently consists of java.io, java.lang,
    java.util, java.microedition.io

5
J2ME Architecture (cont.)
OEM Specific API
  • MIDP Mobile Information Device Profile
  • MIDP provides the core application functionality
    for mobile devices
  • Network connectivity, data storage, and user
    interfaces

6
J2ME Architecture (cont.)
OEM Specific API
  • OEM Specific API
  • Access to proprietary features and functionality
  • Audio system, camera, lighting system, etc

7
J2ME Programming Environment
  • Sun provides IDE for the generic java-enable
    mobile phone
  • Most mobile phone companies like Motorola or
    Nokia have their own IDEs

8
J2ME Applications
  • A J2ME app is called a Midlet

Midlet life cycle
9
J2ME UI
  • MIDP provides some limited UI elements
  • Form
  • Alert
  • Choice and ChoiceGroup
  • List
  • StringItem
  • TextBox
  • TextField
  • DateField
  • Guage
  • Ticker

10
J2ME UI vs J2SE UI
  • MIDP UI elements ARE NOT subsets of AWT/Swing
  • Interaction with the user is based around a
    succession of screens
  • MIDP only has a single command listener

11
J2ME Canvas
  • J2ME does allows lower level access to the Canvas
  • Can create custom graphics and user interfaces by
    extending Canvas

12
Lightweight Window Toolkit
  • Motorola introduced the LWT to address the
    limitation of MIDP
  • Works on all java-enable mobile phone
  • Similar to J2SE Swing
  • Layout management with absolute or relative
    widget placement
  • Notion of containers
  • Component Listeners

13
LWT Hierarchy
14
Sample J2ME Applications
15
Questions?
  • For more info
  • http//java.sun.com/j2me/
  • http//idenphones.motorola.com/iden/developer/deve
    loper_home.jsp
  • shwetak_at_cc.gatech.edu
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