Dr. Dobb's Journal - July 2008 - (Page 54)

State of the Art JAVA & THE NOKIA N810 INTERNET TABLET Eclipse SWT comes with many sample SWT applications, one of which is the File Viewer application that lets you browse folders and files on any computer that can run Java However, I found this to be a little constraining. Instead, I prefer to open a terminal session to the device from my host computer. To do this, install the available Maemo OpenSSH package, along with the Maemo PC Connectivity and Development package ( ma e m o. o r g / d ow n l o a d s / p ro d u c t / OS2008/openssh and http://maemo.org/ downloads/product/OS2008/maemo-pcconnectivity, respectively). Once installed, your device has both a secure shell (SSH) client and server installed, as well as a package that creates a network connection over the USB cable. This is useful when you’re out of range from a wireless network, or you want more security. I usually create SSH sessions from my Mac, and perform secure copies (SCP) over my wireless network. With this, I can develop an application on my Mac, SCP the files to the right place on the N810, and then start the application from my Mac’s SSH session. Of course, if it’s a GUI application, I need to interact with the device once it executes. However, this setup lets me do most of the typing on a full-sized keyboard (see Figure 2). Keep in mind that Nokia does not recommend installing the packages to gain root access because this can “brick the device,” as they say, if you change or overwrite something critical on accident. So be careful! Also, be sure to change the root password to something secure, as it now will be open to attack when on public wireless networks. You can do this with the passwd command. A Command-Line Java Application Let’s get started with a “Hello World!” command-line Java application: public class Test { public static void main(String[] args) { System.out.println ("Hello DDJ!"); } } Once compiled on the host computer, copy the .class file to the device with this command (executed from the host): > scp Test.class root@ :/opt/hello 54 Dr. Dobb’s Journal l www.ddj.com l July 2008 http://maemo.org/downloads/product/OS2008/openssh http://maemo.org/downloads/product/OS2008/openssh http://maemo.org/downloads/product/OS2008/maemo-pcconnectivity http://maemo.org/downloads/product/OS2008/maemo-pcconnectivity http://maemo.org/downloads/product/OS2008/maemo-pcconnectivity http://www.programmingresearch.com http://www.programmingresearch.com http://www.ddj.com

Table of Contents Feed for the Digital Edition of Dr. Dobb's Journal - July 2008

Dr. Dobb's Journal - July 2008 Contents Friday Night Fish Fry Alia Vox Developer Diaries Developer’s Notebook Engineers Without Borders Conversations Patricia Tries Event-Based Architectures Graphs Versus Objects Lock-Free Queues Dr. Dobb’s Architecture & Design World Java and the Nokia N10 Internet Tablet Effective Concurrency The Agile Edge Swaine’s Flames

Dr. Dobb's Journal - July 2008

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