Android ak

ANDROID OS SSMPTC,Tirur Seminar By AYISHA.K

OUTLINE 07/31/10 SSMPTC,Tirur 2. INTRODUCTION TO PLATFORM 3. SECURE DATA STORAGE 4. EXECUTION ENVIRONMENT 1. INTRODUCTION TO ANDROID

What is ANDROID?
Software platform and Operating System
Developed by Google and Open Handset Alliance
Android is a software stack
Operating System
Middleware
Applications
07/31/10 SSMPTC,Tirur

Why Android Was Created?
Software development
Run on very small electronic devices
Full phone software stack including applications
Android is open
Android is free
07/31/10 Ssmptc,tirur

ANDROID ARCHITECTURE 07/31/10 SSMPTC,Tirur Fig. Architecture of Android OS

Linux Kernel
Linux Version 2.6 as - h/w abstraction layer
Proven driver model
Security, Memory & Process Management
Efficient computing resource management
Stable and proven for mobile platform

Libraries
Written in C/C++ - System C Library( libc )
Surface manager - composing different drawing screens
Display/Graphics( SGL )-for 2D graphics
OpenGLES – 3D Graphics Library
Media Libraries
SQLite –RDB engine-light weight
LibWebCore –web browser engine–embeddable web view

Android Runtime
Includes a set of core libraries that provides most of the functionality- JAVA
Every Android application runs in its own process
Dalvik VM executes files in the (.dex) format
Device can run multiple VMs efficiently

Application Framework 07/31/10 SSMPTC,Tirur Enable applications access data from other applications Providing access to non-code resources Notification manager Content provider : Resource Manager : Window Manager Manages the lifecycle of applications Activity Manager :

Techniques for saving data
SQLite Databases : relational database library for storing and managing complex data
Files : you can create, write, and read files from the local storage or external media (SD Cards)
FileOutputStream, FileInputStream, and Resources classes.

Architecture of Data Storage 07/31/10 SSMPTC,Tirur

The Dalvik Virtual Machine
Interpreter only machine optimized for use on low powered, low memory devices like phones
Dalvik uses the Java programming language but not the JVM
Dalvik is not a Java virtual machine.
It uses bytecode format called “dex”.

Life cycle of application 07/31/10 SSMPTC,Tirur
A foreground process
A visible process
A service process
A background process
An empty process

Advantages of Android
Open - Android allows you to access core mobile device functionality through standard API calls.
All applications are equal - Android does not differentiate between the phone's basic and third-party applications -- even the dialer or home screen can be replaced.
Breaking down boundaries - Combine information from the web with data on the phone -- such as contacts or geographic location -- to create new user experiences .
Fast and easy development - The SDK contains what you need to build and run Android applications, including a true device emulator and advanced debugging tools.
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Disadvantages of Android
Security - Making source code available to everyone inevitably invites the attention of black hat hackers.
Open Source - A disadvantage of open-source development is that anyone can scrutinize the source code to find vulnerabilities and write exploits.
Login - Platform doesn't run on an encrypted file system and has a vulnerable log-in .
Incompetence - Google’s dependence on hardware and carrier partners puts the final product out of their control.
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CONCLUSION
Android is a disruptive technology, which was introduced initially on mobile handsets, but has much wider potential.

Android ak

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