College Of Engineering Chengannur
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ANDROID
AN OPEN HANDSET ALLIANCE
PROJECT
Presented by-
Atharva tyagi
OVERVIEW
1. Open Handset Alliance
2. Introduction To Android
3. Introduction To The Platform
4. Android Architecture
5. Anatomy Of An Android Application
6. Development Tools
7. Life Cycle Of An Android Application
8. Conclusion
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Open Handset Alliance
Est. 2007, led by
Google,open source
Main product: Android
Platform
Enthusiastic support from
Industry : both equipment
makers and network operators
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INTRODUCTION
TO
ANDROID
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WHAT IS ANDROID?
o A complete & modern embedded operating system
o A cutting-edge mobile user experience
o A world-class software stack for building
applications
o An open platform for developers, users & industry
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Why Android Was Created?
Full phone software stack including applications
Designed as a platform for software development
Android is open
Android is free
Community support
100% Java Phone
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HISTORY
July 2005
Google acquired Android Inc.
5 Nov 2007
Open HandSet Alliance formed-
Google, HTC, Intel, Motorola, Qualcomm,T-Mobile
Android is the OHA first product
12 Nov 2007
OHA released a preview of the Android OHA
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INTRODUCTION
TO
THE PLATFORM : ANDROID
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Android Features
Integrated browser based on the open source WebKit engine
SQLite for relational data storage
Media support for common audio, video, and still image formats
(MPEG4, H.264, MP3, AAC, AMR, JPG, PNG, GIF)
Dalvik Virtual Machine optimized for mobile devices
Cellular networking : GSM, EDGE, 3G (hardware dependent)
LAN : Bluetooth, and Wi-Fi (hardware dependent)
Graphics Hardware Acceleration
Camera, GPS and Compass (hardware dependent)
Touch screen and accelerometer for motion sensing 10
ANDROID ARCHITECTURE
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Application Framework
Enable applications access data from other applications ,sharing
Providing access to non-code resources
Enables all applications to display alerts in the status bar
Manages the lifecycle of applications
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Libraries
Written in C/C++ - System C Library(libc)
Display/Graphics(SGL)
Media Libraries
SQLite –RDB engine-light weight
LibWebCore–web browser engine–embeddable web view
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Linux Kernel
Linux Version 2.6
Security, Memory & Process Management
Proven driver model
Efficient computing resource management
Stable and proven OS for mobile platform
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Anatomy of an Android Application
There are four building blocks for an Android application:
Activity
-a single screen
Intent Receiver
-to execute in reaction to an external event(Phone Ring)
Service
-code that is long-lived and runs without a UI(Media Player)
Content Provider
-an application's data to be shared with other applications
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Development Tools
The Android SDK includes a variety of custom tools that help you develop mobile
applications on the Android platform.Three of the most significant tools are:
1. 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
2. Android Development Tools Plugin -for the Eclipse IDE - adds powerful
extensions to the Eclipse integrated environment
3. Dalvik Debug Monitor Service (DDMS) -Integrated with Dalvik -this tool let us
manage processes on an emulator and assists in debugging
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Life Cycle of an Android Application
An unusual and fundamental feature - process's lifetime is not directly
controlled by the application itself
Deciding factors:
how important
overall memory available
To determine which processes should be killed when low on memory:
"importance hierarchy“
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Applications
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Initial screen Map Browser
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CONCLUSION
Android is open to all: industry, developers and users
Participating in many of the successful open source projects
Aims to be as easy to build for as the web.
Google Android is stepping into the next level of Mobile
Internet
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THANK YOU
?
College Of Engineering Chengannur
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