Android A Fairy Tail Outline Android A brief

Android - A Fairy Tail

Outline • • • Android – A brief History Android Internals Why you should care about Android App in 10 Minutes The Future 2

CS C 314 Software Development For Portable Devices 3

Android Journey Founded by • Andy Rubin (co-founder of Danger), • Rich Miner(co-founder of Wildfire Communications, Inc. ), • Nick Sears (once VP at T-Mobile) • Chris White (headed design and interface development at Web. TV)

". . . smarter mobile devices that are more aware of its owner's location and preferences“ -Andy Rubin (Senior VP Mobile, Google)

Google’s Vision Or Desperation

Google buys Android - August 2005

Google’s Master Plan • Make the cloud more accessible • Keep connectivity pervasive • Make the client more powerful

Open Handset Alliance 9

Open Handset Alliance Novemb

How is Android Different • • Great Documentation Background Tasks Android Market Platform Heterogeneity

Getting started

Development Environment • Operating Systems – Windows – Mac – Linux • • Eclipse Android SDK ADT Eclipse Plugin (Optional) Native Development Toolkit (Optional)

Which Platform?

Java

"What we've actually been asked to do by Larry and Sergey is to investigate what technical alternatives exist to Java for Android and Chrome. We've been over a bunch of these, and think they all suck. We conclude that we need to negotiate a license for Java under the terms we need. “ - Excepts from internal Google email known as the "Lindholm draft"

Why Java • Popularity – The Most used language in the world • Strong Community • Robust Open Source Tool Chain with a lot of third party libraries

Ways to Develop • • • Java + C/C++ : Primarily for Games HTML + CSS + Java. Scripting

Dalvik Virtual Machine Sun’s standard JVM

Java and Dalvik VM Java Source Code • . java files Byte Code • Java Compiler Java Virtual Machine • Processed Dex Compiler Dalvik Byte Code Dalvik VM Dalvik Executables

Key Differences • Register Based vs Stack Based • More efficient and Compact Implementation • Dalvik runs. dex files

Why not Sun’s Standard JVM • License • Mobile Experience – Size : Dalvik Uncompressed is 70% Java Compressed –. class files – Custom made

Why not J 2 ME

Java Source Code • . java files Byte Code Dex Compiler • Java Compiler Dalvik Byte Code Dalvik VM Dalvik Executables

Application Framework • Dalvik Executables • Resources • Native Libs

What is Android? “ Android is a software stack for mobile devices that includes an operating system, middleware and key applications ”

Android S/W Stack – App Framework 40

Android S/W Stack – App Framework Core Platform Services, • Activity Manager • Package Manager • Window Manager • Resource Manager • Content Providers • View System 41

Android S/W Stack – App Framework Hardware Services, • Telephony Service • Location Service • Bluetooth Service • Wi-Fi Service • USB Service • Sensor Service 42

• Java ---- > C using JNI • Native Development Toolkit

How does Google earn or benefit from Android?

Android Update History 1. 0 23 September 2008 1. 1 9 February 2009 1. 5 (Cupcake) Based on Linux Kernel 2. 6. 27 1. 6 (Donut) Based on Linux Kernel 2. 6. 29 2. 0 / 2. 1 (Eclair) Based on Linux Kernel 2. 6. 29 2. 2 (Froyo) Based on Linux Kernel 2. 6. 32 30 April 2009 15 September 2009 26 October 2009 20 May 2010