Friday, September 17, 2010

Skånetrafiken och Android

Jag läste en kurs om applikationsutveckling för Android i somras. Kursen avslutades med ett projekt. Mitt projekt var en Androidapplikation för att söka resor och tidtabeller för Skånetrafikens bussar och tåg.

Jag blev nöjd med resultatet så jag publicerade appen i Android Market. Mer om den finns på lokaltrafik.info. Sök på "lokaltrafik" i Market/Butiken för att hitta den.

Saturday, May 15, 2010

Wikitrends 2.0

Wikitrends 2.0 is now live. Rewrote and optimized most of it. Compared to the old version a single update now takes 1/10 of the time, with 10x more data. The site now has Wikipedia page views trends over three different time periods; montly, weekly and daily (last version only did daily.) I also moved the site to Wikimedia Toolserver. Thanks to Wikimedia Deutschland for hosting it on their two monster 8-core machines.

The monthly trends, which updates once per day, are based on 432 GB of uncompressed data. To make it even remotely possible to work with without a huge cluster of machines, I filter, aggregate and compress it down to a mere 10 GB.

Sunday, February 21, 2010

Chipmunk for Java

I started working on this project a couple of weeks ago. I was looking for a good (as in good performance) physics library that I could use in Java projects. The ones I found reportedly didn't work well on slower hardware.

The result is Java bindings (i.e. a JNI) to Chipmunk, the 2D physics engine. Below is a demo of it running a simulation on Android Dev Phone 1.


The bindings are far from complete, but I have decided to release the project anyway. Code can be downloaded or browsed from its project page at Github.