Lately I started to try to develop applications for the Nokia N900, and the Maemo platform uses my beloved framework Qt :)
In particular, Nokia started to develop the Qt-Mobility Framework. Quoting from their white paper:
The Qt Mobility Project presents a collection of related software frameworks and interfaces. The objective being to deliver new Qt APIs for mobile application developers. Using these new APIs, developers will be able to create cross-platform applications targeting Maemo, Symbian and other platforms. This suite of features also has components that will be desirable to all users, not just those with mobile devices, so Mobility has advantages even for the desktop user.Thus, I wanted to try this project also on my Desktop (after all the intent of this framework is cross-platform development), and tried to compile qt-mobility on my Ubuntu/Kubuntu desktop. Unfortunately, I experienced many problems which now I seem to have solved, thus I'd like to share the steps to build qt-mobility from sources.
First of all, when installing qt-mobility after compilation, some files will be created in your current Qt installation. Thus, since I wouldn't want to spoil my qt installation from ubuntu packages, which is installed in system path, I downloaded the new qt framework 4.6.3 from the Nokia download site, and installed it in a path of my home: ~/usr/local/Trolltech/qtsdk-2010.03.
Then, I installed some packages that are useful to build qt-mobility and to enjoy media contents such as mp3 and videos, relying on gstreamer (not all these packages may be necessary, but after some tests, at least these packages will make things work):
sudo apt-get install libasound2-dev libbluetooth-dev libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev network-manager-dev libxv-dev gstreamer-tools gstreamer0.10-plugins-base gstreamer0.10-ffmpeg w32codecs ubuntu-restricted-extras gstreamer0.10-plugins-good freeglut3-devThen, you need to get the sources of qt-mobility, and I got them from the git repository
git clone git://gitorious.org/qt-mobility/qt-mobility.git
However, you may want to get the stable sources (e.g., from qt-mobility download).
Since I'm a big fan of "shadow builds" which won't spoil your source directory, I built qt-mobility in another directory of my home, separate from the directory where I have the sources of qt-mobility (in this example the sources are in ~/install/qt-mobility): ~/build/qt-mobility/qt-4.6.3 (I specified the qt version I'm building qt-mobility with, since I may want to experiment with different qt versions):
- cd ~/build/qt-mobility/qt-4.6.3
- PATH=~/usr/local/Trolltech/qtsdk-2010.03/qt/bin:$PATH ~/install/qt-mobility/configure -examples -prefix ~/usr/local/Trolltech/qt-mobility > output.txt
Once the configuration step is successful, you can start building qt-mobility and then install it:
- make install
- install -m 644 -p /home/bettini/build/qt-mobility/qt-4.6.3/features/mobility.prf /home/bettini/usr/local/Trolltech/qtsdk-2010.03/qt/mkspecs/features/
- install -m 644 -p /home/bettini/build/qt-mobility/qt-4.6.3/features/mobilityconfig.prf /home/bettini/usr/local/Trolltech/qtsdk-2010.03/qt/mkspecs/features/
Now, you can test your qt-installation by running an example (which was built and installed), for instance the player demo or the weather demo:
Now, let's try to see whether we're able to use qt-mobility in our programs.
We'll try to compile a very simple qt program using a class from the qt-mobility framework (QVideoWidget), though we won't do anything with that (just to see whether we can build the application).
here's the files of our project
QT += core gui
now, you should run the qmake of your qt installation you've used to build qt-mobility, thus
- ~/usr/local/Trolltech/qtsdk-2010.03/qt/bin/qmake myvideowidget.pro
- g++ -c -pipe -O2 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_SHARED -I../../../../usr/local/Trolltech/qtsdk-2010.03/qt/mkspecs/linux-g++ -I../../myvideowidget -I../../../../usr/local/Trolltech/qtsdk-2010.03/qt/include/QtCore -I../../../../usr/local/Trolltech/qtsdk-2010.03/qt/include/QtNetwork -I../../../../usr/local/Trolltech/qtsdk-2010.03/qt/include/QtGui -I../../../../usr/local/Trolltech/qtsdk-2010.03/qt/include/QtOpenGL -I../../../../usr/local/Trolltech/qtsdk-2010.03/qt/include -I/home/bettini/usr/local/Trolltech/qtsdk-2010.03/qt/include/QtMultimediaKit -I../../../../usr/local/Trolltech/qt-mobility/include -I../../../../usr/local/Trolltech/qt-mobility/include/QtMultimediaKit -I/usr/X11R6/include -I. -I../../myvideowidget -I. -o mainwindow.o ../../myvideowidget/mainwindow.cpp
- g++ -Wl,-O1 -Wl,-rpath,/home/bettini/usr/local/Trolltech/qtsdk-2010.03/qt/lib -Wl,-rpath,/home/bettini/usr/local/Trolltech/qt-mobility/lib -o myvideowidget main.o mainwindow.o moc_mainwindow.o -L/home/bettini/usr/local/Trolltech/qtsdk-2010.03/qt/lib -L/usr/X11R6/lib -L/home/bettini/usr/local/Trolltech/qt-mobility/lib -lQtMultimediaKit -lQtOpenGL -L/home/bettini/usr/local/Trolltech/qtsdk-2010.03/qt/lib -L/usr/X11R6/lib -lQtGui -lQtNetwork -lQtCore -lGLU -lGL -lpthread