ANDROID OPERATING SYSTEM Guided By,Presented By, Ajay B.N Somashekar B.T Asst Professor MTech 2 nd 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 Works as a HAL Device drivers Memory management Process management Networking

Libraries 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 Manifest Resource XML Java Source Generated Class Java Compiler Android Libraries.dex File Dalvik VM Android development

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