Category: Java
Consuming REST on Android with Retrofit, ViewModel and LiveData
Introduction The first functionality we want to implement in the Ersa Android client is some basic dashboarding. We’ll display the latest temperature and humidity readings by origin (sensor node... Read More
Dew Point Calculation in Java
Introduction The core functionality of the Ersa library is all about calculating the dew point from temperature and humidity data. The dew point is used to assess environmental risks, like mold and co... Read More
A REST API with Spring Boot
Introduction The database structure needed for collecting data in our Ersa software is very uncomplicated. At this point we don’t need any authentication mechanism — we simply need to subm... Read More
Android Gauge View
With all these Raspberry Pi and Arduino projects in mind I am developing this gauge view for IoT apps on Android. There are some alternatives around, but I’m not quite satisfied with them as the... Read More
Classic Frogger with libGDX
Roger Engelbert’s excellent tutorial on building a classic Frogger clone with libGDX appears to have gone offline. A couple of months ago I based my own clone on this. It definitely needed some ... Read More
Sliding Toggle Button on Android (2)
The sliding toggle button has been modernized. It has finally been migrated to the Gradle build system and it targets recent API levels now. It has also been added to jcenter, so you can simply add it... Read More
A Radar Chart using MPAndroidChart
I’m using the MPAndroidChart library (3.0.0) to represent psychometric personality test results in a radar chart (AKA spider chart or cobweb chart). Since the documentation I found on this was e... Read More
Packaging a libGDX project for Ubuntu
Introduction We have already seen how to create an installable .deb package. However, to make it Ubuntu we need a source package that actually builds on the Launchpad server farm. This is not hard, bu... Read More
New Launchpad PPA for this site
We have created a new Launchpad PPA for the Ubuntu software presented on this site. Details can be found here: https://launchpad.net/~helfrich . For now the repository only contains a rather silly gam... Read More
Nitris: A cross-platform Tetris-like game using libGDX
Nitris runs as a Java desktop application (Linux, Mac, Windows) and as an Android app (with some modifications also as an HTML5 web app or an iOS app). You can find it in our Git repository. Game conc... Read More