ANDROID presentation prabal

INTRODUCTION
TO MVC WITH ANDROID

INTRODUCTION TO MVC
o Model-View-Controller (MVC) is a software architecture
architectural pattern.
o Heart of MVC is what I call Separated Presentation.
o The idea behind Separated Presentation is to make a clear
division between domain objects that model our
perception of the real world, and presentation objects
that are the GUI elements we see on the screen

MVC

Model:
-Manage the app data and state
-Not concerned with UI or presentation
-Often persists somewhere
 View:
-Present the Model to the user in an appropriate interface
-Allows user to manipulate data.
-Does not store any data except to cache state
 Controller:
-Intermediary between Model & View
-Updates the view when the model changes
-Updates the model when the user manipulates the view

MVC Essentials
The MVC pattern is essentially this:
 Model: What to display
 View: How it’s displayed
 Controller: Formatting the model for display and handling events like user
input

ANDROID FEATURES
SOFTWARE FEATURES
o Integrated browser based on the open source WebKit engine
o SQLite for relational data storage
o Media support for common audio, video, and still image formats
o (MPEG4, H.264, MP3, AAC, AMR, JPG, PNG, GIF)
o Dalvik Virtual Machine optimized for mobile devices
HARDWARE FEATURES
o Cellular networking : GSM, EDGE, 3G (hardware dependent)
o LAN : Bluetooth, and Wi-Fi (hardware dependent)
o Graphics Hardware Acceleration
o Camera, GPS and Compass (hardware dependent)
o Touch screen and accelerometer for motion sensing

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
9
APPLICATION FRAMEWORK

Written in C/C++ - System C Library(libc)
 Display/Graphics(make core of graphics lib.)
Media Libraries
SQLite –RDB engine-light weight
LibWebCore–web browser engine–embeddable web
view
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LIBRARIES

Linux Version 2.6
Security, Memory & Process Management
Proven driver model(qualcomm MSM7K chipset
family)
Efficient computing resource management
Stable and proven OS for mobile platform(in
2008 we use stabel version qualcomm MSM7200)
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LINUX KERNEL

 Includes a set of core libraries that provides most
of the functionality-JAVA (like io,utilities etc)
 Every Android application runs in its own
process
 Dalvik VM executes files in the (.dex) format
 Device can run multiple VMs efficiently
12
Android Runtime

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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
1.Android Development Tools Plugin -for the Eclipse IDE -
adds powerful extensions to the Eclipse integrated environment
1.Dalvik Debug Monitor Service (DDMS) -Integrated with
Dalvik -this tool let us manage processes on an emulator and
assists in debugging

REAL TIME APPLICATION
A translater for Android
 If you are in a country where no one understands
your language
 You cannot read anything
 No aditional device needed
 You have your mobile phone
always with you

REAL TIME APPLICATION (cont.)
Uses the google translator
Can be extended with new languages
Adaptive GUI
GUI fully defined in XML
Uses camera input

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“IMPORTANCE HIERARCHY”
Foreground Process -required for what the user is currently
doing
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 the
user- relevant tasks
Background Process -holding an Activity - not visible to the
user - can kill at any time(stopped)
Empty Process -doesn't hold any active application
components(as a cache to improve start-up

FINDINGS
 Android uses proven technology like Java, XML
andLinux
 There is an initial learning effort
 Android doesn‘t have many of the limitations of
current mobile platforms
 It offers a rich API for application development
 Android is still in beta
 Android development is fun

ANDROID presentation prabal

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