Telefon Adó


Ez az alkalmazás a hívás és sms történeted felhasználásával kiszámítja a tervezett telefon adót, amit a múltban fizettél volna. A számítás paraméterei a beállítás fülön testreszabhatók.

Az Android rendszer korlátai miatt jelenleg csak az utolsó 500 hívás naplója érhető el, ezért csak ezeket tudjuk figyelembe venni. Az elküldött SMS-eknél csak a készülék tárkapacitása szab határt.

Az alkalmazás sehova semmilyen személyes információt nem küld.

Letölthető a Google Play Store-ból:

Telefon Adó on Google Play

Facebook közösségi oldal:


iPhone vs Android 2010 Konferencia

I (Kis Gergely) held a presentation at the iPhone vs Android 2010 Conference in Budapest about multiplatform application development.

I was also the moderator of a panel about iPhone and Android development.

The slides of the presentation may be downloaded from the hungarian page.

Java User Meeting 2009 November

I (Kis Gergely) held a presentation at the Java User Meeting 2009 November in Budapest about Android development.

The slides may be downloaded from the hungarian page.

FSF Free Software Conference 2009

I (Kis Gergely) held a presentation at the FSF Free Software Conference 2009 in Budapest with the title "Google Android from a Developer's View".

We also held an Android workshop at the conference.

The slides may be downloaded from the hungarian page.

Google Android from a Developer's Perspective - Talk at the Free Software Conference 2009, Szeged

I gave a talk at the Free Software Conference 2009: "Google Android from a Developer's Perspective".

After the presentation I held a workshop, where I showed in practice how nice the development environment of Android really is. I used PreziMote, our remote control application as an example, which is able to control presentations over Bluetooth.

The slides may be downloaded from here. (in Hungarian)

Free Software Conference 2009, Szeged

We had a talk a the SZSZK 2009 (Free Software Conference 2009) conference in Szeged about Google Android. The home page of the conference is:

The demo application is PreziMote, an presentation remote control application, which communicates over Bluetooth. It was shown in action during the presentation. After the talk, we had a workshop session where the development of Android applications in Eclipse was shown using PreziMote as an example.

The files are available on the hungarian page.

Broadcasting video with Android - without writing to local files


One of the weaker points of the Android platform is the Media API. When compared to the J2ME API, one important feature is missing: the ability to record to a stream and to playback from a stream.

Why is this important? There are a number of use cases.

For recording:

  • post-processing audio / video data before writing out to the file system
  • broadcasting audio / video without writing out the data first into the file system, which also limits the broadcast to the available free space on the device.

For playback:

  • pre-processing the audio / video data before playing
  • streaming using protocols that are not supported by the built-in media player

In this blog entry we will show a method to broadcast video (and audio) from an Android phone to a network server, without writing to the file system.

Developer Devices for Android


As a nice Christmas Present for developers and hackers, Google announced a developer program where completely unlocked phones can be picked up for a very reasonable price. The phones include an open bootloader, so the developers may upload custom firmware to the phones. And the best news is that the program is also available for Hungarian developers!

The details can be found here:

Our First Contribution to Android


Our first contribution to the Android platform got just merged and deployed to production. Yes, we actually contributed to the Gerrit code review tool.

Our patch makes it possible to browse all changes, not just the open ones. Why is this important?

Every project's history is a very important asset. It documents decisions, like "why was this change merged" or more importantly "why was this change rejected". It also provides an access to historical discussions.

This makes the development process easier to follow, and more open to contributors.

Is Android an open source platform? Yes!


In the past few weeks (or even months, before anything was even open sourced) many opinions appeared on the internet, that the Android platform is

  • not really open
  • includes kill switch, which is evil
  • has substantial limitations
  • reserves functionality to built-in / closed applications
  • it is just J2ME in a new dress

I can completely understand this frustration. However, contrary to these opinions, I don't think that there is anything wrong with Android in this regard. The problem is, like in most cases, communication.

Many people, who read the slogan open source platform were actually expecting an open source firmware for mobile phones. Of course, this is not what Google promised.

So the real question is: What is an open source platform?

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