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Introduction To Android Technology Nilay Mishra ([email protected]) Swathi C ([email protected])
Android Basics.
Android System Architecture .
Power Management and Bindings.
Dalvik Virtual Machine
Android Vs Other OS.
Objective
A Software platform and operating system for
smart devices.
Based on the Linux kernel.
Android was found way back in 2003.
It was developed in Palo Alto, California.
WHAT IS ANDROID.?
Android
Android has open system architecture that means any one can develop there application according to there need
Android is open source over Symbian/iOS/RIM/BADA/others that are copyrighted by there respective companies
Android, Inc. was founded in Palo Alto, California in October 2003 by Andy Rubin (co-founder of Danger),Rich Miner (co-founder of Wildfire Communications, Inc.) and Nick Sears (once VP at T-Mobile).
In July 2005, Google acquired Android Inc. for at least $50 million and Google collaborate with OHA
A business alliance consisting of 80 companies to develop open standards for mobile devices
Companies in OHA are
Relying on Linux Kernel
2.6/3.4/3.10 for core syste
m services
Memory and Process
Management
Network Stack
Driver Model
Security
Providing an abstraction
between the H/W and the
rest of the S/W stack.
Android S/W Stack – Linux Kernel
Kernel Enhancements Power Management
Binder
Mobile devices depend on battery power and batteries have limited capacity
So The main Question is how to handle this???
PM is built on top of standard Linux Power Management.
PM supports more aggressive power management policy.
Components make requests to keep the power on through “Wake Locks”.
PM supports several different types of wake “Wake Locks”.
Binder facilitate IPC between applications and service
Why is Binder Required?
Applications and Services may run in separate processes but must communicate and share data
IPC can introduce significant processing overhead and security hole
Dalvik Virtual Machine Providing
environment on which every Android application runs Each Android
application runs in its own process, with its own instance of the Dalvik VM.
What is Dalvik machine
Dalvik Virtual Machine (Cont) Executing the Dalvik
Executable (.dex) format
.dex format is optimized for minimal memory footprint.
Compilation
Loaded into Dalvik VM
• Fastest growing mobile OS • Over 300,000+ Android activations a day • Android overtook iOS as the dominant OS in
US during 2H 2010 • First phone launched HTC G1 in 2008 • Currently an OS of choice for Motorola, HTC,
Samsung, Sony Ericsson, among others • Software updates every few months
OS Mkt Share
# of Apps
Revenue
Developer Interest
Easiness of PL
Platform
Multitasking
Security
OS Upgrades
App Approval
Payments & Avail.
Android OS: ◦ open platform, allowing the use of 3rd party tools
◦ Key to OS success
◦ can reach core components. More like PC swr
iOS: ◦ Restrictive guidelines
◦ Fixed set of tools, nothing outside, nothing deep
◦ No Flash!
Nilay Mishra ([email protected]) Swathi C ([email protected])
