Shr Android

8/6/2019 Shr Android

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Android OS

Seminar By:SHRAVAN MULGUND

2BAO6IS065

8th semester (Information science)


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Under Guidance of:

Lect. Shilpa Rathod

(Special thanks to

Shweta Angadi)


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CONTENTS

1. INTRODUCTION TO ANDROID

2. ANDROID FEATURES

3. ANDROID ARCHITECTURE

4. LIFECYCLE OF ANDROID APPLICATIONS

5. DEVELOPMENT TOOLS

6. PROS AND CONS OF ANDROID

7. CONCLUSION


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Introduction to Android


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What is Android?

A mobile operating system.

A world-class software stack for building applications

An open platform for developers, users & industry

It is based on Linux operating system.


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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


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Hardware features supported:

Cellular networking : GSM, EDGE, 3G (hardware dependent)

LAN : Bluetooth, andWi-Fi (hardware dependent)

Graphics Hardware Acceleration

Camera, GPS and Compass (hardware dependent)

Touch screen and accelerometer for motion sensing


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Introduction to the platform:

Android


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Android Architecture


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Linux Kernel

Android uses Linux Version 2.6.

Acts as abstraction layer.

Provides drivers for hardware.

Efficient computing resource management like thread

allocation, etc.


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Android applications are compiled to

Dalvik bytecode

Write app in Java

Compiled in Java

Transformed to Dalvik bytecode

Android OSAndroid OS

Loaded into Dalvik VMLoaded into Dalvik VM


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LIFECYCLE OF AN ANDROID

APPLICATION


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Every application runs in its own process.

It enhances performance in security.

It places each process into an important hierarchy based on

components running.


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Activity lifecycle


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IMPORTANCE HIERARCHY

Foreground Process -required for what the user is currentlydoing

Visible Process - holding an Activity - visible to the user on-screen but not in the foreground(on pause)

Service Process - holding a Service - not directly visible to theuser- relevant tasks

Background Process -holding an Activity - not visible to theuser, can kill at any time(stopped)

Empty Process - doesn't hold any active applicationcomponents (as a cache to improve start-uptime)


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Development Tools

The Android SDK includes a variety of custom tools that help youdevelop mobile applications on the Android platform.Three of themost significant tools are:

1. Android Emulator -A virtual mobile device that runs on ourcomputer ;used to design, debug, and test our applications inan actual Android run-time environment

2. Android Development Tools Plugin for the Eclipse IDE - addspowerful extensions to the Eclipse integrated environment

3. Dalvik Debug Monitor Service (DDMS) -Integrated withDalvik -this tool let us manage processes on an emulator andassists in debugging


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REAL TIME APPLICATION

Uses the google translator

Can be extended with new languages

Adaptive GUI

Uses XMPP for data transmission

GUI fully defined in XML

Uses camera input and OCR


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PROS AND CONS OF ANDROID

PROS

All applications are equal.

Fast and easy implementation.

Open Source.

Can build our own applications.


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CONS

Little exposed to hackers as it is open source.


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Conclusion

Android is open to all: industry, developers and users.

Easy to build applications.

Google Android is stepping into the next level of Mobile

Internet.


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ANY QUERIES

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