eestec android workshop 1

A N D R O I D W O R K S H O P 1

A N T O N I S K A L I P E T I S - M O B I L E L E A D , S O U R C E L A I R A K A L I P E T I S @ S O U R C E L A I R . C O M , @ A K A L I P E T I S

W H AT T H E S E W O R K S H O P S A R E N O T F O R

• Being a pro in two weeks

!

• Learning without trying

!

• Knowing everything out there

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

G O O G L E I S Y O U R F R I E N DA N D S TA C K O V E R F L O W T O O !

A G E N D A

• Intro to OOP and Java

• Intro to the Android Platform

• Setting up Android Studio

• Running a simple application

• Creating a simple layout

W H Y U R O C K S O H A R D ?O B J E C T O R I E N T E D P R O G R A M M I N G

• Code decoupling, enforces code reusability

• Associates data structures with their related methods

• Makes real-world object representation easier

A C L A S SL 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

O B J E C TC 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 !

C L A S S E X T E N S I O N

• Classes can extend other classes

• They inherit their attributes and methods

• Can extend only one class

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++; } } }

I N T E R FA C E SF 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

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!"); } }

S O M E O O P L A N G U A G E S

• C++

• Ruby

• Python

• C#

• VB.NET

• ...And, wait for it...

J AVA !L E T ’ S D I V E I N T O …

J AVA AT A G L A N C E

C-like syntax

Created in Sun Microsystems

Now acquired by Oracle

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

G R E AT T H I N G S A B O U T J AVA

• Garbage collector, (almost) good bye memory leaks!

• Shit happens, except exceptions!

• Platform independent, runs on JVM, (or maybe Dalvik!)

– K I T K AT

“Have a break, have a KitKat.”

A N D R O I DE X P L O R I N G T H E W O R L D O F

W H AT I S A N D R O I D

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

B O T T O M S U PA N D R O I D

A C T I V I T Y

• Creates a window, so that the user can interact with the app

• Can communicate with the system

• Controls the hierarchy of the user interface

A C T I V I T Y L I F E C Y C L E

• Save state

• Know when in foreground

• Know when it is possible to be garbage collected by the system

L E T ’ S S TA R T O U R … F I R S T A P P !

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 T H E M U S I N G A B U T T O N !

W H A T C A N I P L A Y W I T H ?