Dr. Dobb's Journal - July 2008 - (Page 55)

Next, in the SSH session on the device, execute the application with this command (from the /opt/hello directory): > java Test Other Development On the Nokia N810 The Maemo-provided N810 Scratchbox development platform and toolset is based on many commonly available open-source Linux development tools, such as Gnome. The platform includes support for glibc-2.5, GTK+ 2.10, and Qt graphics library and The result is “Hello DDJ!” displayed in the terminal window. Although a simple example, this shows that you can work with the N810 as with just about any other Linuxbased computer. Eclipse SWT GUI Java Applications Again, because the Jalimo Java installation comes with both a GTK graphics toolkit and a port of the Eclipse SWT libraries, you can easily develop and run GUI-based Java applications for the N810. To get started, download the latest SWT for Eclipse for your host development computer; you can find it at eclipse.org/swt. In my case, I downloaded the Mac OS X version so that I can debug and test my applications locally before deploying to the device. Next, create a Java project; I called mine SWTTest. With your project selected, click on the Eclipse File menu, choose Import, and then choose Existing Projects into Workspace from within the Import wizard window. Next, browse to the path where the SWT .zip file resides (from the download of SWT), and click the Finish button (see eclipse.org/swt/eclipse.php). In the end, you have access to SWT to develop and run with. To illustrate, I use Listing One, which opens a window that contains the text, “Hello DDJ!,” along with a Close button to terminate the application. It’s basically a GUI version of the “Hello DDJ!” application we ran previously. Once the .class files are copied to the device, you can execute the application: > java -cp /usr/share/java/s wt-gtk.jar:/usr/share/java/ swt-gtk-3.4.M3.jar:. SWTTest Figure 2: The N810 has a backlit, full QUERTY keyboard that slides out from underneath. D ow nl oa d a PEG® GUI Development Tools A family of portable graphics software for designing a high performance GUI for any embedded device. 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. This application comes in handy on the N810, since it doesn’t have a full-featured graphical file browser. application development G RA PH I CS SO FT WA RE FO R E MBE D D E D SYS TE MS July 2008 l www.ddj.com l Dr. Dobb’s Journal 55 http://eclipse.org/swt http://eclipse.org/swt/eclipse.php http://www.swellsoftware.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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