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While location-based mobile apps are becoming increasingly popular, they are still relatively new. Special considerations need to be made for battery life and handling large data sets of geolocated data. The good news is there are many services and technologies you can use to assist you in building mobile location-based apps.In this session, Aaron Parecki, co-founder of Geoloqi.com, shows you services you can leverage to do things like nearby business lookups, location-based triggers, nearest intersection queries, and more. Aaron also covers the location services available on the various mobile platforms as well as in HTML 5, and shares some insights on how to deal with battery life. The session concludes with some real-world use cases for real-time location such as turning on and off your lights in your house or sending an SMS when you leave work.
Citation preview
Geolocation in Web and Mobile Apps
Aaron Parecki – Web Directions – May 2011 aaron@parecki.com – http://aaron.pk – @aaronpk
Slides and code available at
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Displaying a Map
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Displaying a Map - HTML
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Displaying a Map - iPhone
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Displaying a Map - Android
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Finding the User’s Location
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Browser Geolocation
! Desktop browsers use nearby wifi hotspots
! Mobile devices may use GPS or cell tower positioning
! You can also use IP lookups to get a rough location (but is usually very inaccurate)
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Browser Geolocation
with Wifi
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Browser Geolocation
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Browser Geolocation
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Finding the User’s Location using Javascript
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Browser Geolocation
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Browser Geolocation
! Usability problem with this approach:
! User is left with an empty page waiting for them to press “allow”
! You should do the best you can with no location, and then update your page after you get the user’s location
! Could use IP-based location to center a map somewhere that is (probably) nearby
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Using SimpleGeo
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Start with IP-based geolocation to quickly center the map. Update with browser-based geolocation after it’s available.
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Finding Nearby Businesses
! SimpleGeo Places
! Foursquare API
! Twitter API
! Yelp API
! Google Places API
! Many others
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Place Search with Foursquare
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developer.foursquare.com
Place Search with SimpleGeo
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Place Search with SimpleGeo
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Finding Information About a Location
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SimpleGeo Context
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SimpleGeo Context
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Monitoring Continuous Location
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Monitoring Continuous Location in Javascript
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Now go run around outside! (But keep the browser open)
Keep the browser open? That’s kind of lame.
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Monitoring Continuous Location on the iPhone
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This will keep running in the background! (But now you will potentially drain the battery)
Getting the User’s Approximate Location
Saving battery by
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Retrieving Approximate Location on the iPhone
[locationManager startMonitoringSignificantLocationChanges];
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• Your app will be re-launched in the background when the user moves “significantly”
• Most likely when they change cell towers
• Location is very rough, ~500-1500m accuracy
Retrieving Approximate Location on Android
locationManager.requestLocationUpdate( LocationManager.PASSIVE_PROVIDER, 0, 0, listener);
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• Service runs in the background, gets locations when other providers or apps request location.
• Could be cell tower location, could be GPS
Location-Based Triggers
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Geonotes Location-Based Reminders
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Try it! aaron.pk/geonote
Trigger-Based Actions
Create triggers based on where users are.
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Send a message to all users within a radius.
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Notify X when you arrive at place Y
Arrived
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Real-time location-based gaming aaron.pk/unplugged11 @aaronpk
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mapattack.org
Hybrid Web/Native App
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Web Views
Communicating Between the Web and Native Components
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Communicating Between the Web and Native Components
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Turning On/Off Your Lights
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Geoloqi API Your Home Server
X10 SMSified.com
Your Home Lights And sending an SMS when you leave work
X10 Lamp Switch
Linux Command Line X10 Client
www.heyu.org
$ heyu on A1
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Create a Layer in Geoloqi
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Docs: geoloqi.org/API/layer/create
Create a Trigger in Geoloqi
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Docs: geoloqi.org/API/trigger/create
Handling a Trigger from Geoloqi
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Docs: geoloqi.org/Trigger_Callback
Create an SMS Number
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smsified.com or tropo.com
Send an SMS
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Questions? Code: aaron.pk/unplugged11 Geoloqi API: geoloqi.org/API SMS API: smsified.com
Aaron Parecki @aaronpk
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