Monday Sep 28, 2009

Simple Strategy for Logging and Monitoring of MIDlets

On-device debugging isn't useful when your MIDlet is running on a client's phone. This tech tip presents one approach to developers who want a fast and simple way to debug their apps remotely in real environments.

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Friday Sep 11, 2009

destroyApp() Is Your Friend

Concurrency and data safety are complex subjects. This tech tip addresses specific issues around handling individual record-entry safety and third-party libraries.[Read More]

Monday Aug 31, 2009

More Reasons to Use JavaFX for Your Next Mobile Application

Bruce Hopkins briefly answers the questions that were submitted in the Comments section of his article Three Reasons Why Your Next Java ME Mobile Application Should Include JavaFX Mobile[Read More]

Monday Jul 27, 2009

Faster Data Transfer With Bluetooth and Contactless Communication

Learn how Bluetooth applications can bypass the device discovery and service searching by using Near-Field Communication (NFC) technology and JSR 257 (Contactless Communication API).[Read More]

JavaFX on the Mac OS: Security Warning

Have you been seeing a newly worded warning message appear when you access samples or documentation examples on your Mac? This tech tip explains how to turn off the message.

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Wednesday Jul 08, 2009

Java ME SDKs and Tools: The State of the Union

The Java ME platform is huge, robust, and versatile. This article provides a compatibility matrix of tools, SDKs, and APIs, including NetBeams, MOTODEV Studio, Nokia, Blackberry, Sony Ericsson, and LG.[Read More]

Wednesday Jun 10, 2009

Working with Bluetooth and GPS: Follow-up

The “Working with Bluetooth and GPS” series on the Bluetooth API (JSR-82) spawned a number of questions, which author Bruce Hopkins addresses in this follow-up tech tip.

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Wednesday Apr 22, 2009

Using the Location API for Favorite Spots

This tech tip shows you how to get started using the Location API (JSR 179), and how to build a small location-aware application that you can use to tag your favorite spots.[Read More]

Friday Feb 06, 2009

Three Reasons Why Your Next Java ME Mobile Application Should Include JavaFX Mobile

Developer Bruce Hopkins walks you through three source-code samples to demonstrate JavaFX's usefulness to Java ME developers creating apps for mobile devices. Developers can call methods on objects and instantiate objects within libraries that already exist in Java ME and Java SE -- in this case, the APIs in JSRs 82, 135, and 180. Plus, JavaFX let you bind the value of an object to another variable.[Read More]

Wednesday Jan 21, 2009

Notes from the Java Mobile, Media & Embedded Developer Days

Here are notes from the presentations I attended at the Java Mobile, Media & Embedded Developer Days (M3DD) today, at the Sun campus in Santa Clara, California.

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Tuesday Dec 09, 2008

Early Access to Java On Device Portal SDK

The new Java On Device Portal (ODP) lets developers use Java technology to
create and deploy widgets on mobile devices. Register now to join the
Early Access program.

[Read More]

Wednesday Dec 03, 2008

JavaFX and JNLPs: How to Develop and Run JavaFX Applets and Applications Offline

This tech tip by Sun software engineer Thomas Ng describes how to run Java Network Launch Protocol (JNLP) files offline, such as for debugging or testing applets or applications developed with JavaFX.

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Monday Nov 03, 2008

Report from Africa: A Java ME MIDlet for User-Generated Localization

In this article, the authors describe the process of developing a user-generated localization MIDlet for an application that connects people to community radio stations -- important purveyors of information in technology-challenged Africa.

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Friday Oct 31, 2008

Asynchronous Communications with Java ME and SIP: Part 2

Bruce Hopkins uses a SIP proxy and the REGISTER method type to provide a simple, yet scalable solution for sending a simple message asynchronously from one application to the other, when one SIP device is behind a firewall.[Read More]

Monday Oct 27, 2008

Bluetooth and GPS: Part 2 - Parsing GPS Data and Rendering a Map

Bruce Hopkins describes how to use Java ME technology and its Bluetooth API (JSR-82) to access location data from wireless GPS devices, in this second of a two-part series. The JSR-172 (XML Parsing and Web Services) API is used to parse the result.

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Tuesday Sep 16, 2008

Blu-ray Disc Application Development with Java ME

Java technology is a critical part of the new high-definition video standard, the Blu-ray Disc standard. In this first of a two-part series, Bruce Hopkins covers several aspects of using the Java language to create applications for your Blu-ray disc player, which includes the very popular PlayStation 3 gaming console.

[Read More]

Thursday Sep 04, 2008

Using JavaScript Object Notation (JSON) in Java ME for Data Interchange

In this code-rich article, mobility technologist C. Enrique Ortiz introduces the lightweight JSON Java ME APIs as an alternative to XML.

[Read More]

Thursday Aug 07, 2008

Ask the Experts: JavaFX Preview, August 18-22

The recently released JavaFX Preview helps early adopters become familiar with JavaFX. Got a question about it? Post it during this session and get answers from three key members of Sun's JavaFX engineering team.

[Read More]

Thursday Jul 31, 2008

JavaFX Learning Curve Journal Updates

In August and September 2007, the Sun Developer Network staff started a Learning Curve Journal, a series designed to help users get started with the JavaFX Script programming language. A number of significant advances have been made to the language since then. The Learning Curve Journal has been updated to show you how to use the compiler-based version of the language. Other changes have been made to make the articles current.

[Read More]

Wednesday Jul 16, 2008

Bluetooth and GPS: Part 1 - Reading Wireless Serial Port Data

In the first of this multi-part series, Bruce Hopkins describes how to construct a low-cost solution that allows you to install, debug, and test your JSR-82 applications on your computer, and how to read data from a Bluetooth-enabled GPS device.

[Read More]

Thursday Jun 19, 2008

Near-Field Communication and the Contactless Communication API (JSR 257)

NFC is a short-range radio technology that operates on the 13.56 MHz frequency, with data transfers of up to 424 kilobits per second. NFC communication is triggered when two NFC-compatible devices are brought within close proximity, around four centimeters. The Contactless Communication API allows you to discover and exchange data with contactless targets such as NDEF tags, RFID tags, and external smartcards. C. Enrique Ortiz dissects a Contactless Communication API MIDlet.

[Read More]

Wednesday Apr 30, 2008

New Gaming Experiences with OpenGL ES and the Mobile Sensor API

Several mobile devices on the market today have a built in accelerometer, much like the one used in the controls for the Nintendo Wii. Java ME developer Erik Hellman believes that built-in accelerometers in mobile phones will become even more common as new mobile games appear. In this simple game for a Sony Ericsson w910i, he uses both the OpenGL ES API for Java ME and the Mobile Sensor API to read them.

[Read More]

Friday Mar 28, 2008

The Future of Content Consumption: Which Screen?

TiVo brought us "time shifting" (watching the content you want when you want). Sling Media introduced "place shifting" (watching content outside the living room). The internet now offers a new consumption paradigm. I recently attended a panel on which screen might become dominant for long-form video delivery and viewing: free (ad-supported) content on computer screens, says VUZE, and fee-based content on television screens via a VUDU storage device.

[Read More]

Thursday Mar 06, 2008

Using Filters With the Java ME Device Matrix

When you want to know what devices support a specific set of Java ME technologies, use the Software Filter to search the Java ME Device Matrix. This tech tip explains how to set multiple filters.[Read More]

Wednesday Feb 06, 2008

Detecting Java ME Optional Packages

Eric Giguere explains how to detect the presence or absence of an optional package in a Java ME application.[Read More]

Tuesday Jan 29, 2008

Mobile & Embedded Developer Days Recap

The first Mobile & Embedded Developer Days conference was successfully held on January 23-24, 2008, in Santa Clara. Robots and flashing coasters and electronic toys, what more could a girl want! [Read More]

Thursday Jan 10, 2008

Quiz: How MSA-Savvy Are You?

Test your MSA knowledge by taking this quiz, put together by SDN staff writer Richard Marejka.[Read More]

Tuesday Dec 11, 2007

Mobile Java and Sprint

Sprint/Nextel has a strong history of Java ME-based innovation in mobile technology. The new Sprint Wireless Toolkit 3.2 with MSA support is available from Sprint as of today.

[Read More]

Thursday Dec 06, 2007

Ultra-low Bandwidth Communication with Java ME

Bruce Hopkins explores how to use Java ME and Sun SPOT technology to create a low-bandwidth wireless system to read sensor data. He provides two fully functioning applications: the first one is the base station application, which will receive data from the second application, the free roaming wireless Sun SPOT.[Read More]

Friday Nov 30, 2007

Java ME Technology Overview

C. Enrique Ortiz walks you through the world of mobile Java technology, including configurations, profiles, and Java Technologies for handsets, smart cards, and embedded devices.

[Read More]

Tips for developers who use Java technologies (Java SE, Java ME, JavaFX) for mobile and embedded devices.


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