USING OPEN DATA IN!MOBILE APPLICATIONS

ABOUT ME

ALLAN@I2M.DK!

•  Allan Lykke Christensen"•  14 years experience"•  B.S.c. 1. Class Honours Computer

Science & E-Business"•  Career"–  Director

Interactive Media Management"–  Vice President

Danish ICT Management"–  Business Analyst

PRO€INVEST (EU)"–  Software Engineer

Siemens Communications"–  Technical Consultant

Metrocomia"–  Independent Consultant"

•  Open source and open data solutions"•  LinkedIn

http://dk.linkedin.com/in/allanlykkechristensen"

Using Open Data in Mobile Applications

PURPOSE OPEN DATA &

MOBILE APPS!

•  Introduction to Open Data"•  Open Data Services"•  Open Data in Mobile Apps"•  Success Factors"•  Getting Started!"

Using Open Data in Mobile Applications

WHAT IS OPEN

DATA? FROM OPEN

DEFINITION.ORG!

1.  Access"2.  Redistribution"3.  Reuse"4.  Absence of Technological

Restriction"5.  Attribution"6.  Integrity"7.  No Discrimination against Persons

or Groups"8.  No Discrimination against Fields of

Endeavour"9.  Distribution of License"10. License must not be specific to a

package"11. License must not restrict the

distribution of other works"

Using Open Data in Mobile Applications

OPEN DATA

SERVICES NOT ALL

SERVICES ARE FREE!

•  Government"–  Kenya Government

http://opendata.go.ke"–  World Bank

http://data.worldbank.org"–  United Nations

http://undata-api.org/"–  Data.gov

http://www.data.gov"–  Data.gov.uk

http://www.data.gov.uk""

•  Non-government"–  OpenStreetMap

http://openstreetmap.org"–  Wikipedia

http://www.dbpedia.org"

•  Portals and Providers"–  Infochimps

http://www.infochimps.com"–  Socrata

http://opendata.socrata.com"–  Freebase

http://www.freebase.com"–  DataMasher

http://www.datamasher.com"

Using Open Data in Mobile Applications

MOBILE APPS

EXAMPLES!

•  CDFMonitor"•  Msema Kweli"•  Huduma (SMS)"•  K-Traffic"•  mHealth (Ethiopia)"•  PHSRP (India)"

Using Open Data in Mobile Applications

DATA EXCHANGE

COMMON PROTOCOLS AND

FORMATS!

•  Protocols / Query"–  SOAP"–  REST"–  XML-RPC"–  X over HTTP"–  SPARQL"–  YQL"–  OData"

•  Formats"–  JSON"–  XML"–  RDF"–  XLS"–  CSV"–  TXT"–  HTML"–  PDF"

Using Open Data in Mobile Applications

SUCCESS FACTORS

CONSTRAINTS!

•  Flat rates"•  Smart phones"•  Marketing of solutions"•  Partnerships"•  More open data!"

Using Open Data in Mobile Applications

GETTING STARTED

DEVELOPERS!

•  Find a service"•  Explore the datasets"– Register API key"

•  Determine protocol"•  Determine format"•  Identify client API libraries"•  Design queries"

Don’t just consume, PRODUCE!"

Using Open Data in Mobile Applications

GETTING STARTED FIND A SERVICE!

Using Open Data in Mobile Applications

h"p://opendata.go.ke  

h"p://www.infochimps.com  

GETTING STARTED

EXPLORE DATASETS!

Using Open Data in Mobile Applications

h"p://opendata.go.ke/browse  

GETTING STARTED

DETERMINE PROTOCOL &

FORMAT!

Using Open Data in Mobile Applications h"p://dev.socrata.com/  

GETTING STARTED

CLIENT API LIBRARY!

Using Open Data in Mobile Applications

•  For opendata.go.ke we need a REST client that supports JSON"

•  Devices:"– J2ME"•  org.json  Java  Library  

– Android"•  org.json  Java  Library  •  Open  Data  Kit  

–  iOS"•  json-­‐framework  (Google  Code)  

GETTING STARTED

DESIGN QUERIES!

Using Open Data in Mobile Applications All queries below should be prefixed http://opendata.go.ke "

•  http://opendata.go.ke/api/views.jsonList of available datasets. Datasets have unique identifiers."

•  /api/views/rsim-nh7f.json Get dataset with unique identifier rsim-nh7f (CDF Projects)"

•  /api/views/rsim-nh7f/rows.json Gets all the data in the data set"

•  /api/views/89zb-g69r/rows.json?max_rows=20 Gets the first 20 data entries in the data set"

•  /api/views/89zb-g69r/rows/2.json Extract record number 2 from the data set"

•  http://dev.socrata.com/querying-datasetsFilter queries use the HTTP POST method or by predefining queries"

GETTING STARTED

WRITING THE CODE!

Using Open Data in Mobile Applications

J2ME""String url = "http://opendata.go.ke/api/views/rsim-nh7f/rows.json?max_rows=100";

// Prepare a RESTful connection

HttpConnection hc = (HttpConnection) Connector.open(url);

hc.setRequestMethod(hc.GET);

hc.setRequestProperty("Accept-Type", "application/json");

// Execute connection

int responseCode = hc.getResponseCode();

GETTING STARTED

WRITING THE CODE!

Using Open Data in Mobile Applications J2ME"

"// Read the (JSON) response into a String InputStream is = null; StringBuffer b = new StringBuffer(); try {

is = hc.openInputStream(); long len = hc.getLength(); int ch = 0; if (len != -1) { for (int i = 0; i < len; i++) { if ((ch = is.read()) != -1) { b.append((char) ch); } } } else { // Read till the connection is closed. while ((ch = is.read()) != -1) { len = is.available(); b.append((char) ch); } }

} finally { if (is != null) { is.close(); } hc.close();

}

GETTING STARTED

WRITING THE CODE!

Using Open Data in Mobile Applications J2ME"

"// Turn response into JSONObject JSONObject json = new JSONObject(b.toString()); JSONArray results = json.optJSONArray("data"); // Store result in internal data structure Vector projects = new Vector(); // Column indexes int COLUMN_ID = 1; int COLUMN_COUNTY = 9; int COLUMN_DISTRICT = 10; int COLUMN_CONSTITUENCY = 11; int COLUMN_PROJECT = 12; int COLUMN_SECTOR = 14; int COLUMN_EXPECTED_OUTPUT = 17; int COLUMN_STATUS = 19; int COLUMN_ESTIMATED_COSTS = 21; int COLUMN_TOTAL_COSTS = 28; // Iterate through resutls if (results != null) {

for (int i = 0; i < results.length(); i++) { JSONArray item = results.getJSONArray(i); CdfProject project = new CdfProject(); project.setId(item.get(COLUMN_ID));

project.setTitle(item.get(COLUMN_PROJECT)); project.setConstituency(item.get(COLUMN_CONSTITUENCY));

projects.addElement(project); } }

SUMMARY

•  Open data"•  Mobile apps"•  Data exchange"•  Success factors"•  Getting started"

Using Open Data in Mobile Applications

THANKS FOR LISTENING!ALLAN@I2M.DK