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Android. - A Fairy Tail. Outline. Android – A brief History Android Internals Why you should care about Android Android App in 10 Minutes The Future. Android Journey. Founded by Andy Rubin (co-founder of Danger ), Rich Miner(co-founder of Wildfire Communications, Inc .),
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Android - A Fairy Tail
Outline • Android – A brief History • Android Internals • Why you should care about Android • Android App in 10 Minutes • The Future
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 WebTV)
"...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 Novemb
How is Android Different • Great Documentation • Background Tasks • Android Market • Platform Heterogeneity
Development Environment • Operating Systems • Windows • Mac • Linux • Eclipse • Android SDK • ADT Eclipse Plugin (Optional) • Native Development Toolkit (Optional)
"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 • Java + C/C++ • C++ : Primarily for Games • HTML + CSS + JavaScript • Scripting
Dalvik Virtual Machine Sun’s standard JVM
Java and Dalvik VM • Java Compiler • Java Compiler • Dex Compiler DalvikExecutables
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
Dex Compiler DalvikExecutables
Application Framework • DalvikExecutables • 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 Core Platform Services, • Activity Manager • Package Manager • Window Manager • Resource Manager • Content Providers • View System
Android S/W Stack – App Framework Hardware Services, • Telephony Service • Location Service • Bluetooth Service • Wi-Fi Service • USB Service • Sensor Service
Java --------> C using JNI • Native Development Toolkit
Android Current Distribution Based on data collected on January 4, 2011
Open source project • http://source.android.com • Apache 2.0 and GPL v2 • Git repository
Android SDK • Android emulator • Command line tools • Documentation • Sample Applications
Eclipse plugin • https://dl-ssl.google.com/android/eclipse/
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