Mobility Tech Tips are tips, techniques, and sample code on topics of
interest to developers using mobile Java technologies: Java ME
(including MSA, MIDP, and the wireless toolkits for CDC and CLDC) and
JavaFX technologies.
Wed, 30 Apr 2008 17:17:07 -0700
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.
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Mon, 21 Apr 2008 11:57:22 -0700
Asynchronous Communications with Java ME and SIP: Part I
Bruce Hopkins shows two MIDlets that employ the SIP protocol and JSR 180 API to communicate asynchronously, complete with source code. JSR 180 is a part of the MSA standard , so more and more mobile devices are supporting this API.
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Fri, 28 Mar 2008 14:51:06 -0700
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.
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Thu, 6 Mar 2008 11:32:58 -0800
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.
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Wed, 6 Feb 2008 14:40:45 -0800
Detecting Java ME Optional Packages
Eric Giguere explains how to detect the presence or absence of an optional package in a Java ME application.
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Tue, 29 Jan 2008 19:19:30 -0800
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!
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Thu, 10 Jan 2008 18:19:24 -0800
Quiz: How MSA-Savvy Are You?
Test your MSA knowledge by taking this quiz, put together by SDN staff writer Richard Marejka.
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Tue, 11 Dec 2007 15:54:51 -0800
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.
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Thu, 6 Dec 2007 15:53:20 -0800
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.
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Fri, 30 Nov 2007 09:40:54 -0800
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.
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Wed, 14 Nov 2007 17:39:36 -0800
Using MIDP in the Java ME Games API
Apress book on creating games using the Java ME platform nicely explains development (the geeky side) and distribution (the business side).
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Wed, 14 Nov 2007 17:20:20 -0800
Activing Alerts in MIDP 2.0
Eric Giguere explains how to create progress-indicator gauges or activation alerts in Java applications running MIDP.
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Wed, 14 Nov 2007 13:41:41 -0800
Ho w to Encrypt Data in Java ME Applications Using the SATSA API
This tip from Bruce Hopkins includes a complete working example that runs on the Sun Wireless Toolkit for CLDC and SATSA-enabled (Security and Trust Services API) mobile devices.
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Fri, 26 Oct 2007 17:31:43 -0700
Invoking JavaFX Code From NetBeans
This wide-ranging " Ask the Experts " transcript of last week ' s NetBeans IDE 6.0 session contains the phrase " I feel your pain " and many more enlightening discussions.
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Thu, 18 Oct 2007 18:04:52 -0700
MIDP Provisioning With Servlets
In this tech tip, Eric Giguere shows how to write a simple servlet that automatically selects the right version of your application and delivers it through the magic of over-the-air (OTA) provisioning.
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Mon, 8 Oct 2007 21:35:05 -0700
Externalizing Resources - Persisting Images in RMS
In this tech tip, C. Enrique Ortiz describes how to save bandwidth by implementing a local cache -- using an RMS (Record Management System) -- for images. This also reduces MIDlet download size.
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Mon, 8 Oct 2007 21:01:33 -0700
Obfuscating Your MIDlet Suite
This tech tip from C. Enrique Ortiz illustrates obfuscation tools to reduce MIDlet suite size to save Over-the-Air (OTA) size and time. It includes examples with both Sun Java Wireless Toolkit and Ant scripts.
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Mon, 8 Oct 2007 19:50:02 -0700
Ajax-like Asynchronous SOA Calls with Java ME
Eric Giguere explains why the Java ME platform lends itself quite readily to accessing external resources using a service-oriented architecture (SOA) -- inclulding that many Java ME applications are built using an Ajax-like model, except of course with Java used in place of JavaScript.
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Mon, 8 Oct 2007 18:28:56 -0700
Accessing a Resource over HTTP
This technical tip from C. Enrique Ortiz introduces a Java helper class, NetworkUtils , that defines a number of HTTP constants and a helper method that uses an HttpConnection to connect to a server over HTTP, get a resource, and return it as a DataInputStream .
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