First hybrid app

I uploaded my first hybrid app made with Qt 5.1 to Google Play. The app is a simple score counter that can be used to track scores in social games like card e.g. card games. It uses C++/Qt for logic and QML for the UI.

Since Qt 5.1 for android is a developer preview version there are still many things that are not fully functional. This app was exclusively tested only on android 4.1 running on Samsung Galaxy Note II, so there's no guarantee that it will run on other setups. Qt 5.2 is promised to bring a performance boost and a more stable build on android, and Digia has encouraged to postpone app publishing in Play Store until then. That being said you are welcome to test the app and email me if you have any questions about it. If someone is interested in the source code, please do inform me and I'll see what I can do :)

Android package sign problem

So I ran into trouble when trying to publish my first Qt application on google Play store (using Qt 5.1.1, and Qt Creator 2.8.1). First of all I learned that "The Android system requires that all installed applications be digitally signed with a certificate whose private key is held by the application's developer" (more info here). Luckily Qt Creator 2.8.1 already includes an automated tool for creating this private keystore, so there's little extra effort involved. So I created a new keystore, signed my application with it and compiled the release version. But when I tried to deploy the app to my cellphone through Qt Creator, it would not start at all.

Turns out that the problem was that the default signing algorithm has changed between JDK 6 and JDK 7. So if you have JDK 7 installed your package will get signed with an unacceptable algorithm. More on this problem can be found here. My solution was to temporarily replace JDK 7 with JDK 6 (not the best solution). After this I could succesfully deploy the signed package.