android full report

[seminar class]

[attachment=11877]
ANDROID OS
Next Generation Mobile Computing
What is ANDROID?
 Mobile Operating System
 based on Linux 2.6 kernel
 July 2005; Google acquired Android Inc.
 5 Nov 2007; Open HandSet Alliance form
 Google, HTC, Intel, Motorola, Qualcomm, T-Mobile
 12 Nov 2007; OHA released a preview of the Android os
 21 oct 2008:Google relese all code under apache license
Android is a software stack
Operating System
Middleware
Applications Framework
Android Features
 Application Framework
Enabling reuse & replacement of component
 Dalvik Virtual Machine
Optimized for mobile devices
 Integrated Browser
Based on open source WebKit engine
Android Features
 Optimized graphics
powered by custom 2D graphics library 3D based on openGL
ES 1.0 specification
 SQlite
Structured data storage
 Media Support
common audio,video and image format
Android Features
 GSM telephony (hardware dependant)
 Bluetooth,EDGE,3G,Wi-Fi(hardware dependant)
 Camera ,GPS (hardware dependant)
 Rich Development Environment
SDK include device emulator, debugger, memory &
performance profiling , plugin for Eclipse IDE
ANDROID ARCHITECTURE
 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
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.
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”.
ANATOMY OF APPLICATION DEVELOPMENT
 SDK
Google provide 3 version Windows, Mac OSX and Linux.
developer can use Android plugin for Eclipse IDE
step1ecompose prospective application into following
component
Activity-visual user interface
Intent Receiver-e-mail inbox
Sevice –task done in background
Content Provider-share some data
step2redefine all component in AndroidManifest.xml file.
ANATOMY OF APPLICATION DEVELOPMENT
 There is the activity Creator script, which generates the following files and folders in your Eclipse workplace:
- AndroidManifest.xml file
- Build.xml – an ant file which is used to package an
application;
- src/ - source directory
- bin/ - the output directory
R.Java file created it index to all above file DDMS (Dalvik Debug Monitor Server) For debugging & testing
DEVELOPMENT TOOL
 Android Emulator -A virtual mobile device that runs on our computer -use to design, debug, and test our applications in an actual Android run-time environment
 Android Development Tools Plugin -for the Eclipse IDE – adds powerful extensions to the Eclipse integrated environment
 Dalvik Debug Monitor Service (DDMS) -Integrated with Dalvik-this tool let us manage processes on an emulator and assists in debugging
Life cycle of application
 A foreground process
 A visible process
 A service process
 A background process
 An empty process
APPLICATION
CONCLUSION
Android is a disruptive technology, which was introduced initially on mobile handsets, but has much wider potential.