About me

• Sergi Martínez

• +2 years working on Android

• +15 years working on development

• Android Dev Team Lead at Tempos 21

• Co-founder of Catdroid (Catalonian Android community)

• Follow-me at @sergiandreplace

Contents

• Starting with Android

• Starting the project

• OSN formats: XML vs. JSON

• OSN Android library overview

• Get this presentation: http://kcy.me/9bin

STARTING WITH ANDROID

The quickest introduction to Android you’ve ever seen

Installing the environment

• developer.android.com/sdk/installing.html

• Install Eclipse 3.6/3.7/3.8

• Download Android SDK

• Install ADT plugin for eclipse

• Add platforms and packages

APK

Android applications

Activity A1 Activity A2 Activity B1

APK

APK

ServiceContent provider

Broadcast receiver

Widget Activity C1

Ap

plic

atio

n 1

Ap

plicatio

n 2

Application 1 Stack

Activity A1

Activity A2

Activity B1

Activities lifecycle

More info about Android

• http://developer.android.com

• http://forum.xda-developers.com/

• http://vogella.de

STARTING OUR PROJECT

That means lunchtime is coming!

Create a new project

Include libraries

• GSON: serialize and deserialize objectsto/from JSON.http://code.google.com/p/google-gson/

• SimpleXML: serialize and deserialize objectsto/from JSONhttp://simple.sourceforge.net/

Get OSNLibrary

• http://code.google.com/p/osn-samples/

• Package com.tempos21.opencities.osn

• Folder /src/com/tempos21/opencities/osn

OSN FORMATS: XML VS. JSON

XML & JSON

• Both are text formats

• Used to store and transfer information

• Several variants and associated technologies

XML

• (X)HTML is a subset of XML

• Based on tags <XXX>…</XXX>

• Validate through schema (DTDXSD)

• Separates data and metadata

• Great support for internationalization

• http://www.w3schools.com/xml/

JSON

• Usually content is lighter

• Faster (and easier) to parse

• Simplest format

• http://json.org/

ComparisonXML<?xml version="1.0"?>

<catalog>

<book id="bk101">

<author>Gambardella, Matthew</author>

<title>XML Developer's Guide</title>

<description>An in-depth look at creating applications with XML.</description>

</book>

<book id="bk102">

<author>Ralls, Kim</author>

<title>Midnight Rain</title>

<description>A former architect battles corporate zombies, an evil sorceress, and her own childhood to become queen of the world.</description>

</book>

</catalog>

JSON{"catalog":

{"book": [

{

"@attributes": {"id":"bk101"},

"author":"Gambardella, Matthew",

"title":"XML Developer's Guide","description":"An in-depth look at creating applications with XML.“

},

{

"@attributes":{"id":"bk102"},

"author":"Ralls, Kim",

"title":"Midnight Rain",

"description":"A former architect battles corporate zombies, an evil sorceress, and her own childhood to become queen of the world.“

}

]}

}

Which one to choose?

• There is no definitive answer

• JSON is often more used for web services due to smallest files to transfer

• You can retrieve both for OSN services

• A good idea is to use same format than sensor output in order to use same parser in all the code

OSN LIBRARY OVERVIEW

After all this time, we start now with the main topic…

Team

• Project Manager: Ana Martínez

• Android: Sergi Martínez & Tager Hammoud

• iOS: Luis López

• Windows Phone: Raul Rodríguez

What contains the library?

• A set of beans designed to fit the data fromOSN

• A set of helpers used to call the services and transform the answer into beans

Beans

Service

Resource

ServiceContainer

Extras

Entry

EntryContainer JSON only

JSON + XML

HttpUtil

• HttpUtil.downloadString

• HttpUtil.parseJSON

• HttpUtil.parseXML

• downloadJSON = downloadString + parseJSON

• downloadXML = downloadString + parseXML

RETRIEVING SERVICE METADATA USING THE OSN ANDROID LIBRARY ALT+TAB

RETRIEVING SERVICE DATA USING THE OSN ANDROID LIBRARY ALT+TAB

EXTRAS

Getting more information

• http://opencities.upf.edu/osnweb/

• https://wikis.dtic.upf.edu/wikis/opencities/

• http://opencities.net

Making questions

• Forum: http://support.opencities.upf.edu/

• Communities: – Catdroid.org

– GTUG

– NSCoders

– BJUG

– BCN.net

– Etc……..

QUESTIONS

Download this presentation: http://kcy.me/9bin