Barcamp Antwerp 21/03/09
Michaël Uyttersprot
twitter.com/eMich // www.emich.be

More and more GPS enabled phones

Started all with the Nokia N95
◦
iPhone 3G
◦
Nokia N79, N85, N97,…
◦
HTC G1
◦
… and lots of others to come!

It becomes a lot easier to program mobile

apps
External devices can be approached easily


iPhone SDK

Python ME

CLDC a.k.a. J2ME

Native C++ because we all « love » that

…


I love GPS-enabled services

I love Java

Google Maps does everything I once had in

mind
… actually not really


Great service, but limited to my friends

I want to show my location on my blog

But there is no API yet!


No wordpress, written my own blog software

No third party moblogging

◦ Does pictures
◦ Does geotagging based on picture metadata
◦ Does video as well
But still no eMich latitude?! I suck…


Different building blocks

◦ GPS enabled phone: Nokia N79
◦ J2ME using the JSR179
specification also known as
« Location »
◦ Web server that records GPS
coordinates
◦ Google Maps, of course, because
eMich maps would be an
impossible thing (except Open
maps or something blablabla)

Location API

Obtain GPS coordinates from a GPS-enabled

phone
Very easy: just a few lines of code!


Criteria cr = new Criteria();
cr.setHorizontalAccuracy(500);
LocationProvider locationProvider =
LocationProvider.getInstance(cr);
Location location=locationProvider.getLocation(60);
Coordinates c = location.getQualifiedCoordinates();
c.getLatitude()
c.getLongitude()
c.getAltitude()

A thread loops every 10 seconds

Reads coordinates from Location API

Sends them to a web server: test.emich.be

Keeps in DB:

Latitude
◦
Longitude
◦
UserId
◦
Timestamp
◦

Reads last entry

Displays a map with a marker


Push content based on location

◦ Wikipedia articles
◦ Commercial messages…
Doing fun stuff

◦ How much time do I spend with my girlfriend?
◦ Mash it up for twitter to mash it up with fights

?