Android Workshop hosted by Antonis Kalipetis, organized by EESTEC LC Athens - 2014. Agenda: • Intro to OOP and Java • Intro to the Android Platform • Setting up Android Studio • Running a simple application • Creating a simple layout

1. ANTONIS KALIPETIS - MOBILE LEAD, SOURCELAIR
AKALIPETIS@SOURCELAIR.COM, @AKALIPETIS
ANDROID WORKSHOP 1

2. W H AT T H E S E
WORKSHOPS ARE
NOT FOR
• Being a pro in two weeks
!
• Learning without trying
!
• Knowing everything out
there

3. W H AT W E A R E G O I N G T O L E A R N
• General knowledge of the platform
• Simple application creation
• Learn how to search

4. GOOGLE IS YOUR FRIEND
A N D S TA C K O V E R F L O W T O O !

5. AGENDA
• Intro to OOP and Java
• Intro to the Android Platform
• Setting up Android Studio
• Running a simple application
• Creating a simple layout

6. OBJECT ORIENTED PROGRAMMING
WHY U ROCK SO HARD?

7. • Code decoupling, enforces code reusability
• Associates data structures with their related methods
• Makes real-world object representation easier

8. L E T ’ S S A Y I T ’ S A B L U E P R I N T, I T ’ S A W A Y T O R E P R E S E N T D A TA
A CLASS

9. C E R TA I N D A TA R E P R E S E N TA T I O N , I N M E M O R Y !
OBJECT

10. CLASS
EXTENSION
• Classes can extend other
classes
• They inherit their
attributes and methods
• Can extend only one
class

11. public class Car {
public int maxSpeed;
public int currentSpeed;
!
public void accelerate(int speed) {
int tmpSpeed = currentSpeed + speed;
if (tmpSpeed < maxSpeed) {
currentSpeed = tmpSpeed;
} else {
currentSpeed = maxSpeed;
}
}
}
!
public class Truck extends Car {
public int trailers;
public int maxTrailers;
!
}
public void addTrailer() {
if (trailers < maxTrailers) {
trailers++;
}
}

12. F U N C T I O N A L I T Y PA C K S - A C T I O N D E S C R I P T I O N S
I N T E R FA C E S

13. public class Car {
// …
}
!
public interface MilitaryUnit {
abstract void startShooting();
}
!
public class MilitaryCar extends Car implements
MilitaryUnit {
@Override
public void startShooting() {
System.out.println("Bang, Bang!");
}
}

14. SOME OOP LANGUAGES
• C++
• Ruby
• Python
• C#
• VB.NET
• ...And, wait for it...

15. LET’S DIVE INTO…
J AVA !

16. J AVA
AT A G L A N C E
C-like syntax
Created in Sun Microsystems
Now acquired by Oracle

17. public class HelloWorldJava {
public static void main(String[] args) {
System.out.prinln("Hello, World!”);
}
}

18. G R E AT T H I N G S A B O U T J A V A
• Garbage collector, (almost) good bye memory leaks!
• Shit happens, except exceptions!
• Platform independent, runs on JVM, (or maybe
Dalvik!)

19. “Have a break, have a KitKat.”
– K I T K AT

20. EXPLORING THE WORLD OF
ANDROID

21. W H AT I S
ANDROID
Complete software stack
Operating System
Middleware
Key Applications
Open Source
Developed by the Open
Handset Alliance
Fastest growing market
Platform with the most
devices activations

22. ANDROID
BOTTOMS UP

23. ACTIVITY
• Creates a window, so that
the user can interact with
the app
• Can communicate with the
system
• Controls the hierarchy of
the user interface

24. ACTIVITY
LIFECYCLE
• Save state
• Know when in foreground
• Know when it is possible to
be garbage collected by
the system

25. L E T ’ S S TA R T O U R …
FIRST APP!

26. WHAT CAN I PLAY WITH?
C R E AT E S O M E M O R E V I E W S , E V E N
T R Y T O D Y N A M I C A L LY C H A N G E
THEM USING A BUTTON!