mobile app devt

7/30/2019 Mobile App Devt

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Mobile Application Development

Seyoum T.

Jan 12, 2011

MIT


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Outline

Mobile vs other computing devices

Wireless Application Protocol

Wireless Markup Language

Messaging Technologies

SMS, EMS, MMS

Emulators

Java/.NET frameworks for mobile app devt


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Mobile devices: Characteristics

Memory

2MB to 64MB

Display area

Sound, limited color displays Capabilities/resolution

128 x 160 to 320 x 480 pixels

Limited bandwidth

9.6 Kbps to 11Mbps Intermittent connectivity

and high latency

640 x 480 to 1600 x 1200

Hundreds to millions of colors

CPU and considerable memory

> 28.8 Kbps

Stable Networks

PC-like SystemsHandheld Devices


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Mobile App Development

App for small, low-power handheld devices

Apps are either

Pre-installed during manufacture

Downloaded by customers from app stores

e-Business vs m-Business

Will it work?

Moving a Web app into a mobile app?

Differences in device, network, user


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WAP: Wireless Application Protocol

Protocol to support development of apps overcellular networks

Added support for IP, TCP, HTTP

Address unique characteristics of wirelessdevices

Small screens, limited memory, limited user

interfaces, limited battery-life Minimized processing power requirements,

optimized network resources


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WAP Architecture

Layered protocol stack

GPRS, GSM

Primary concern for thedeveloper: defines app-specificmarkup languages such as WML


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WML: Wireless Markup Language

A markup language intended for devices thatimplement the WAP specification

Similar in concept to HTML

Produces XML document Validated against its declared DTD


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WML...

WML documents are called decks

Navigation support

Use of to link two cards together

WML is restricted in its support for images

wireless bit map graphics (wmbp) image format

tag

Like HTML, WML provides data input, hyperlinks, text and imagepresentation, forms, etc

WML decks are stored in a web server

text/vnd.wap.wmlMIME type enabled

WAP gateway bridge between mobile devices and the WWW

WMLScript add more functionality to WML such as looping, decision making, etc


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XHTML

Derivative of XML and HTML

HTML web sites (PC-based browsers)

WML apps for handheld devices

Can we create a single version of apps that canbe viewed by PC-based browsers and mini-browsers available on handheld devices?

YES!

XHTML

Using reduces development time standardizing the appearance


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Emulators

Simulators for app development

Java

J2ME Wireless Toolkit

Integrated with IDEs such as NetBeans and eclipse

emulation environment, documentation and examples

.NET

Microsoft Mobile Explorer 3.0 Ericsson WAP Toolkit 3.1

Nokia WAP Toolkit 3.1

Windows Mobile 2003 Emulator


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How mobile Apps Work?

Sample .NET mobile app implementation


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Mobile Messaging Technologies

SMS, EMS, MMS


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How SMS works

SMSC SMS Center Store-and-forwar

MSC Mobile SwitchingCenter

Tower, Cell


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Development of SMS-based apps Inter working between SMS and Email

Add Email gateway for SMSC

Push Technology WAP Push

Minimum user intervention

Web Apps and SMS integration


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Thank You!

mobile app devt

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