Trying a Cute Approach to Android
Amidst all the chaos surrounding the Qt project, the power of open source software has shown itself. The Romanian developer Bogdan Vatra has ported Qt to Android. To avoid trademark conflicts, the result was named Necessitas.
Before looking at how to setup the tools and build an application, lets look at the system from the users' view. When downloading a Qt based application, the size matters. The classic wiggly example that has shipped with Qt since the dawn of time is only about 113kB. Animated Tiles, provided by Bogdan Vatra, requires a 153kB download.
When the user has downloaded and installed the application, it is time to run it. When started, every Qt application looks for a helper called Ministri. The job of Ministri is to provide shared Qt libraries for all Qt applications. This saves disk space and bandwidth. When starting wiggly for the first time, the user is guided to Android Market from where Ministri can be downloaded and installed for free.
Ministri now takes over and downloads the Qt libraries. After this, wiggly happily runs. It uses the native Android on-screen keyboard and even rotates with the device when I change its orientation.
In my opinion, the fun part of using Qt is not to use the applications, but to write them. To do that, download the necessitas installer. Run through it, but make sure to install in /opt/necessitas and nowhere else. You will have to chmod +x the installer to make it executable. Then follow this great setup guide to configure QtCreator. If the Qt version complains about not being properly installed, you might have to create a symbolic link to get things working.
Then it is just a matter of coding, building and deploying. Try it yourself today!
Johan Thelin is a consultant working with Qt, embedded and free
software. On-line, he is known as e8johan.
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
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With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide