Android Course ….

Brief history about android. Features of android. Development challenges in android. Android OS architecture. Apps of android. Apps Architecture. Manifest file. Activity life cycle. Intent class.

Session Content

Foundation company.

Founders of Android OS.

 Open Handset Alliance.

Why android is number one in the world.

Versions of android OS till now.

Android’s brief history …

Foundation company of Android OS:-

Android was founded in Palo Alto company in October 2003 in California.

The main target was to invent an OS for digital cameras but they were changed

their efforts to produce mobile OS.

In august Google was buying android.

Android’s brief history cont’d

Android founders:-

Andy Rubin (brain and manager of producing android OS in google later).

Rich Miner.

Nick Sears.

Chris White.

Android’s brief history cont’d

On November 5, 2007, the Open Handset Alliance, a consortium of technology companies including

Google Device manufactures

Sony – Samsung – HTC Wireless Carriers

sprint Nextel – T-Mobile Chipset makers

Qualcom – Texas Instrument

Open Handset Alliance

Why android is number one in the world…?In 2011,2013 Android devices sell more

than IOS, Windows Phone and Mac OS.On July 2013 Google play stores had over 1 million android Apps published and over 5

billion App downloaded.

In April-May 2013 71% of mobile developers developed in android.

Android’s brief history cont’d

Versions of android:-Android alpha (1.0) Gingerbread (2.3–2.3.7)

Android beta (1.1) Honeycomb (3.0–3.2.6)

Cupcake (1.5) Ice Cream Sandwich (4.0–4.0.4)

Doughnut (1.6) Jelly Bean (4.1–4.3.1)

Eclair (2.0–2.1) KitKat (4.4–4.4.4)

Froyo (2.2–2.2.3)

Android’s brief history cont’d

Open platformopen sourceopen plug in

Java Implementation(not native).

fragmentation

Features of Android

Fragmentation Issue.

Resolution Issue.

Screen sizes Issue.

Portability Issue.

Development challenges in android

Android OS Architecture

Every App consists from a set of Activities.

Activitysingle screen in your program that will

do a specific task.

Apps of Android

Apps Architecture

Hello World!

Button

App Layout

The manifest file is a mandatory file for every application

Contains: Application declaration Activities Services Permissions Hw and Sw resources used by the Application Intent-filters

Manifest File

Activity life cycle

onCreate() Called when the activity is first created, a must! onStart() Called when the activity becomes visible to the user onResume() Called when the activity starts interacting with

the user onPause() Called when the current activity is being paused

and the previous activity is being resumed onStop() Called when the activity is no longer visible to the

user onDestroy() Called before the activity is destroyed by the

system (either manually or by the system to conserve memory)

onRestart() Called when the activity has been stopped and is restarting again

Activity life cycle cont’d

Intents: asynchronous messages to activate core Android components (e.g. Activities).

Explicit Intent The component (e.g. Activity1) specifies the destination of the intent (e.g. Activity 2).

Intent class

**********

Login