Transcript Facebook for Android update.docx

ANDROID OPERATING SYSTEM
Guided By,
Ajay B.N
Asst Professor
Dept of CS & E
Presented By,
Somashekar B.T
MTech 2nd Sem (CE)
Dept of CS & E
Presentation outline:
1.Introduction
2. Android features
3. Architecture
4. Application building blocks
5. Activity life cycle
6.Development tools
7.Android development
8. Android as a ubiquitous system
Introduction
• A software platform and operating system for mobile
devices
• Based on the Linux kernel
• Developed by Google and later the Open Handset Alliance
(OHA)
• Allows writing managed code in the Java language
Android features
Software 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
Hardware Features:
• Cellular networking : GSM, EDGE, 3G
• LAN : Bluetooth, and Wi-Fi
• Graphics Hardware Acceleration
• Camera, GPS and Compass
• Touch screen
Architecture
Linux Kernel
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Works as a HAL
Device drivers
Memory management
Process management
Networking
Libraries
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C/C++ libraries
Interface through Java
Surface manager – Handling UI Windows
2D and 3D graphics
Media codecs, SQLite, Browser engine
Android Runtime
• Dalvik VM
– Dex files
– Compact and efficient than class files
– Limited memory and battery power
• Core Libraries
– Java 5 Std edition
– Collections, I/O etc…
Application Framework
• API interface
• Activity manager – manages application life cycle.
Applications
• Built in and user apps
• Can replace built in apps
Application building blocks
1.Activity
2.IntentRecevier
3.Service
4.ContentProvider
Activity life cycle
Android development
Android
Manifest
Resource
XML
Java Source
Generated
Class
Android
Libraries
Java
Compiler
.dex
File
Dalvik
VM
Development Tools
•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
Android as a Ubiquitous system
•Interoperability
•Heterogeneity
•Mobility
•Survivability & Security
•Adaptability
•Self organization & Augmented reality
•Implicit interaction
•Task-based interaction
Android as a Ubiquitous system
•Interoperability
•Heterogeneity
•Mobility
•Survivability & Security
•Adaptability
•Self organization & Augmented reality
•Implicit interaction
•Task-based interaction