The document discusses the basics of mobile operating systems and developing mobile applications using the QT framework. It covers different mobile OS types, choosing an SDK, using an IDE, C++ syntax for Symbian OS, and the two main approaches for QT development: drag and drop and writing code. It also lists commonly used QT libraries like QWidget, QPushButton, QTimer, and provides examples for loading images, using layouts, buttons, timers, and text. The document recommends learning C++ basics, signals, and how to connect C++ and GUI before developing mobile apps with QT.

2. • The Operating System is the communication between
hardware and software.
• Types of Mobile OS:
• Symbian OS
• Android OS
• iPhone OS (iOS)
• BlackBerry OS
• Windows Phone 7 (Mobile OS)
• Bada

3. • Make sure that you choose the right SDK.
• SDK is the emulator of the phone.
• You are free to choose your IDE.
• IDE is the software application that allows the computer
programmer to develop software for a certain platform

4. • The native language of the Symbian OS is C++, So you
should know C++ syntax well.
• Symbian OS has more than types:
• S40
• S60 3rd
• S60 5th
• S90

5. • Why Symbian and it’s some kind old OS ?!!
• Because it’s the easiest environment to work in it.
• Like Facebook and Google+
• Why QT ?!
• Based on C++ programming language.
• Because it’s the very simple mobile application SDK and
IDE to use.

6. • You can work in the QT environment in 2 ways:
• Drag and Drop
• Here you are able to drag anything and drop it in the place you
want.
• You can’t make every thing with Drag and Drop.
• Writing Code
• Here you can either write the program from A to Z or you can
Drag and Drop something then edit its code.

7. • What you need to develop on QT
• Know C++ syntax well
• Know the basics in C++ programming language
• Have Background about GUI
• Know how to connect between C++ and GUI

8. • Contents of any QT library
• Variables
• Methods
• Signals
• To use this libraries you must include QtGui library.
• QT has a lot of libraries, we will list the most commonly used
of it.
• QWidget: the library that have all you need, your class inherits
from it.
• QApplication: without it you can’t run your program.
• QPushButton: button to press.
• QLabel: label to hold something.
• QTextEdit: text field to fill it.

9. • QTimer: to count time.
• QPixmap: to load image.
• QMenuBar: menu toolbar.
• QMenu: a menu in the menu toolbar.
• QAction: actions is in the menu of any menu toolbar.
• QPoint: point has x and y.
• QSize: has length and width.
• QMessageBox: message box.
• QString: has strings but in QT.
• QKeyEvent: has signal if key is pressed.

10. • If you want to declare a button, you have 2 ways to do
that
• QPushButton button = new QPushButton(“Hello World!!!”);
• QPushButton * button = new QPushButton(“Hello World!!!”);
• What is the difference between the last 2 examples:
• Meaning ?!
• Functions ?!
• In its library
• In another library
• If you want to make a QT program you MUST use
pointers.

11. • Communication between QT with C++
• You won’t use it much so you can know
• Variables
• Functions
• Classes
• Loops
• Note: any function you want to add to your class, you add
it to “public slots:” section

12. • GUI in C++ is no different more about GUI in Java, for
example:
• Button in C++ is called QPushButton.
• Button in Java is called Jbutton.
• It’s just names and the function are similar.

13. • Videos maked by Dr. Sherif Khattap, It’s may help.

14. • Experiment – Load Image (Drag and Drop).

15. • QPixmap * pic = new QPixmap("c:test.png");
• QLabel * label = new QLabel();
• label->setPixmap(*pic);
• label->show();
• Don’t forget to include QTGui library first.

16. • Experiment – Layouts Design (Drag and Drop).

17. • Experiment – Press Button (Coding).

18. • Experiment – Making more than 1 form.

19. • Experiment – Timer (Coding).

20. • Experiment – Dealing with Text (Coding).

21. • All libraries of QT: http://doc.qt.nokia.com/4.7/qtgui.html
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