Motorola i325 Spezifikationen PDF herunterladen (Seite 12)

iDEN i325 J2ME™ Developers’ Guide

Page 12

2004 Motorola, Inc.

2. Application Management

2.1. MIDlet Lifecycle

A MIDlet’s lifecycle begins once its MIDlet suite is downloaded to the device. From that point, the

Application Management Software (AMS) manages the MIDlet suite and its MIDlets. The user’s

primary user interface for the AMS is the Java Apps feature built into the device’s firmware.

From the Java Apps feature, the user can see each MIDlet suite on

the device or access the Java System menu item. If a MIDlet suite

has only a single MIDlet, then the MIDlet’s name is displayed in the

Java Apps menu for that MIDlet suite. Otherwise the MIDlet suite

name is displayed. Then when that MIDlet suite is highlighted, the

user can open the MIDlet suite and view the MIDlets in that MIDlet

suite.

The Java Apps Menu

From the Java Apps menu, the user can highlight a

MIDlet suite and bring up the About dialog for that

MIDlet suite. The About dialog contains:

•

••

•

MIDlet Suite Name

•

••

•

MIDlet Suite Vendor

•

••

•

MIDlet Suite Version

•

••

•

JAR Size (not installed only)

•

••

•

The number of MIDlets in the MIDlet Suite

•

••

•

MIDP and CLDC version requirements (not

installed only)

•

••

•

Flash usage, Program and Data Space

(installed only)

About Properties

for a MIDlet

2.2. MIDlet Suite Installation

From the Java Apps menu, the user can install MIDlet suites. A MIDlet suite must be installed before

any of its MIDlets can be executed. Installation involves extracting the classes from the JAR file and

creating an image that will be placed into Program Space. The resources are then extracted from the

JAR file and placed into Data Space. The JAR file is then removed from the device, thus freeing up

some Data Space where it was originally downloaded.

The space savings from removing the JAR file is one advantage of Installation. However, perhaps an

even greater advantage is that class loading is not done during run time. This means that a MIDlet

won’t experience slow-down when a new class is accessed. Furthermore, the MIDlet won’t have to

share the heap with classes have been class-loaded from the JAR file.

Java Apps

Blackjack

Snake

Java System

Run

Back

Download Apps

About

Vendor:

Name:

Motorola, Inc.

Download Apps

Done

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