Facing new challenges everyday

In the previous article we talked a little about how to create the necessary code that shows how to create a basic hello world application on Qtopia platform, in this article with will show how to generate the makefile, build, install and run this application.

Please open a Konsole window and the execute the following commands:

#setting the appropiate environment variables
source /opt/Qtopia/SDK/scripts/devel-x86.sh

#changing to directory where the sources can be found
cd ~/projects/helloworld

#generating make files from helloworld.pro
qtopiamake

#clean previous build
make clean

#build application binaries
make

#creating the application package to deploy on device (or emulator)
sdk –p

#installing application on device
sdk –i

You can run the application by clicking on runqpe icon on desktop.

I personally would like to see Qtopia platform as real option of application platform for Nokia devices, Qtopia has a lot of features that makes the application development much more easy than Symbian platform.

In my previous articles about Qtopia application development I showed the directory structure for a Qtopia project, the contents of basic Qtopia project file (helloworld.pro) and how to create the application interface with user interface files (helloworld.ui), in this article I’ll talk about the classes to be used in our helloworld application and how we can integrate the user interface files in our applications.

Every Qtopia application requires a initialization code like we have in the code block below:

main.cpp

In the example above we are using to macros QTOPIA_ADD_APPLICATION and QTOPIA_MAIN, both are only available if qtopia_main is set in CONFIG variable of application project file (helloworld.pro) as described in this article.

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The majority of applications requires a user interface to allow user interaction with application functionalities, this third part of our article will talk about the user interface files that are xml files used to define the contents of Qtopia graphical elements like dialog boxes and windows.

In the example below we are defining a QWidget called HelloWorldBase, this widget is the main window of helloworld application, it contains a QLineEdit (input box), a QLabel and a QPushButton each of then can be declared in xml using the <widget> tag where the class attribute indicate the widget type and name attribute holds the object instance name. Each widget may have default values for its properties, you can define the widget properties using <property> tag, a property requires a name that must be supplied on name attribute of this tag.
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In my previous article we had a short introduction to Qtopia development, I also showed how to use the example project that comes with SDK to start a new one.

This article will talk a little about one of the most important files of any Qtopia project the applicationname.pro file, this file contains very important configuration parameters for every Qtopia application, please open your preferred text editor and put the code below (look the comments):
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After read the Qtopia SDK documentation I started the development of my first application, it’s very simple! The first thing that you need to do is download the Qtopia Greenphone SDK CD image, burn the image and run the SDK installer, this SDK contains a VMWare image, you can load this VMWare image using VMWare player, it contains all developer tools necessary to develop and package Qtopia based applications.

Qtopia SDK comes with an example application at /home/user/projects/application folder, this example application contains a basic skeleton of Qtopia project, here’s a list of files that are required in every Qtopia project:
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