NoZoM Android Workshop

7/31/2019 NoZoM Android Workshop

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Getting started with AndroidIntroduction to android application developmentsession by

By @AlSayedGamal

#Nozom_android

Saturday, May 12, 12


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Agenda

Whats Android.The stack.

android Roadmap.

Getting your hands dirty.



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1.Whats Android and whats not?

Android is

for

that

includes an operating system, middleware and kepapplications.

Its NOT a handset name.

ItsNOT

J2ME.Its NOT Google reply to iPhone.



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History

Aug 2005

Google acquired Android.

Nov 2007

OHA* announced that Android SDK is available.

Sept 2008

HTC and T-Mobile announced G1

Oct 2008

Android SDK 1.0

Android Market goes live

G1 is available in the retail store.

*OHA is (Open Handset Alliance) including top OEM and operators {Motorolla, intel, htc, T-Mobile, Samsung, LG, Google, etc..



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OHA

pen

andset

lliance

OEM

Semi-conductors

Commercialization

Software

operator



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Dec 2011



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OS Shares worldwide*

Android Symbian

iOS RIM

Bada Microsoft

Others

*According to Gartner Nov 2011Saturday, May 12, 12


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OS Shares worldwide*

52%

17%

15%

11%

2%

1%1%

Android Symbian

iOS RIM

Bada Microsoft

Others

*According to Gartner Nov 2011Saturday, May 12, 12


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Devices (not telephones)

CellphonesTablets

TV

more



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2.The stackWhat to expect from android.



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2.The stack.

Android is based on the almighty linux kernel.

Android comes with great libraries and APIs for your

special hardware to make full use of you device.

Android has rich development tool set including

emulator, debugging tools, GUI composer,etc..

Android is ready for i18n.

The DVM is young VM yet its optimized to the linux

kernel.



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Technical prerequisites for

Android development.

Java* = Java SE - Swing - AWT - reflection + some API(s).

HTML5 is an option (nice option if you are going cross platform).

Others (nice for RAD and cross platform).

*We are interested in that option todaySaturday, May 12, 12


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Android the platform

Android the OS is the largest part but its not

everything.

Android emulator and AVD.

DVM (Dalvik Virtual Machine).

ADB (Android Debug Bridge).



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Closer look



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Closer look



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Android internals



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Android internals

Linux Kernel



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Android internals

Linux Kernel

Libraries



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Android internals

Linux Kernel

Libraries Android Runtime



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Android internals

Linux Kernel


Application Framework



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Android internals

Linux Kernel


Application Framework

Applications



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Everything is an application

Your app is first class citizen



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API levels and Android versions.

You must have heard about Ice cream sandwich.

API levels 1->14

Android versions 1.x.x -> 4.x.x

The capabilities vs. popularity compromise.

Backward compatibility.

A-[I]-Z.



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Android development tools

Eclipse ADT plugin

DDMS

AVD

more..



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3.android RoadmapMilestones in any android developer life.



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Rules are made to break in.

Installation and configuration

Activity and Intent

Layouts

Background Services

Broadcast receivers.

Content providers.

Shared preferences, sqlite database and file storage.

Internet and C2DM.

Geolocation apps.



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1.Activity

publicclassActivityextendsApplicationContext{ protectedvoid onCreate(Bundle savedInstanceState); protectedvoid onStart();

protectedvoid onRestart();

protectedvoid onResume(); protectedvoid onPause(); protectedvoid onStop(); protectedvoid onDestroy();}



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1.Activity

Activity class is the main building block in any android

application.

Basically every screen in any android app is an activity.

Every activity may deal with one or more layout.

Its essential to know the Activity lifecycle*.

onCreate, onPause, onRestart, onResume methods.

*Template design pattern.[2]Saturday, May 12, 12

A d id A i i lif l


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Android Activity lifecycle

Image source: http://developer.android.com/images/activity_lifecycle.pngSaturday, May 12, 12


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2.Intent



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2.Intent

Intent is the message passing system in Android.

Is used to message {activities, services and broadcast

receivers}

Its used to call system services as well as your app

activities.*

Intents can contain extra data and this is how wetransfer data between activities,apps,services,etc..

Application dependency issues.

*Thats why your app is 1st class citizen.



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Intent filters

When intents meet Activities.

Action

Category

Ex.The application launcher scenario.



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3.AndroidManifest.xml



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3.manifest.xml

Each application has one manifest file

Its app configuration file in short.

ADT interface shows what do you expect from it.

Warning: Dont forget to define your activies there.

*Thats why your app is 1st class citizen.



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4.Getting your hands dirtyLets practice what we have learnt so far.



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1.Installation and

configurationEclipse, ADT and the SDK



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Application Directory

Structuresrc : your code lives here.

res : your layout and resource files are here.

gen: by name its generated content mostly it maps to

layouts and resources.

bin : output files and APK (Android Package)

executable file.

AndroidManifest.xml: general configuration file.



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The Android Package

meet the



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The Android Package

APKmeet theSaturday, May 12, 12


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App1: todo list

In order to add a new task as a user, I should be able

to supply task name in a textbox and hit save.

In order to confirm saving the task I should see a

success message.

Task should be added to a list of checkboxes.

In order to mark a task completed I should check the

check box by the task name.



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App2:

SuperComm

App is basically 3 buttons using which user can accessdialer, SMS app, and web.

App is containing a textbox containing the number/url

Im trying to call,SMS or browse.



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Debugging your app.

DDMS.

adb.

file browser.

Playing with the emulator.



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References

.

http://en.wikipedia.org/wiki/Template_method_patternhttp://en.wikipedia.org/wiki/Template_method_patternhttp://en.wikipedia.org/wiki/Template_method_patternhttp://en.wikipedia.org/wiki/Template_method_patternhttp://developer.android.com/http://developer.android.com/


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Summary

Android is now and future.

Its opensource and fun.

Android stack and rich development tools.

Everything is an application and your application is 1st

class citizen.

Android application development terminology.

Android development road map.



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Questions & Answers



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Thank you!

NoZoM Android Workshop

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