Location-Based Services on Android

The slides I used in my talk at the GDG DevFest Bacolod 2012 (November 5, 2012)

Transcript

1. Location-Based Services on Android Jomar Tigcal GDG DevFest Bacolod 2012 November 5, 2012
2. Jomar Tigcal • Community Manager of GDG Philippines • Mobile Apps Developer • Software Engineer at Stratpoint Technologies, Inc. • One of the developers of Moochfood http://jomar.tigcal.com jomar@tigcal.com @jomartigcal
3. Moochfood Moochfood is an Android application that allows you to record, rate and share dining experiences. http://www.moochfood.com/
4. Location
5. Challenges • Obtaining user location can consume a lot of battery • Getting location takes some time • Because the user location changes, you must account for movement by re-estimating user location every so often. • Location estimates from each source may not be accurate.
6. android.location Android provides a location framework that your application can use to determine the device's location and bearing and register for updates. http://developer.android. com/reference/android/locat ion/package-summary.html
7. Android Permissions • ACCESS_COARSE_LOCATION -> Network Provider: cell tower and Wi-Fi signals • ACCESS_FINE_LOCATION -> GPS Provider
8. Android Permissions Note: If you are using both NETWORK_PROVIDER and GPS_PROVIDER, then you need to request only the ACCESS_FINE_LOCATION permission, because it includes permission for both.
9. Android Location API • Location A class representing a geographic location sensed at a particular time. • LocationManager This class provides access to the system location services. • LocationListener Interface used for receiving notifications from the LocationManager when the location has changed.
10. Image Source: http://evalblog.com/2011/06/06/where-am-i/ Getting User Location
11. Getting User Location • Create an instance of LocationManager Location locationManager = (LocationManager) this.getSystemService (Context.LOCATION_SERVICE); • Check Location Provider final boolean gpsEnabled = locationManager.isProviderEnabled (LocationManager.GPS_PROVIDER);
12. Getting User Location • Start listening for location updates locationManager.requestLocationUpdates (LocationManager.GPS_PROVIDER, 0, 0, locationListener); • Stop listening for location updates locationManager.removeUpdates(this);
13. Getting User Location
14. Getting User Location
15. Getting User Location
16. What's next?
17. Commonly used APIs Image Sources: http://developer.foursquare.com and http://thegreasywiener.com/
18. Google Places API (https: //developers.google. com/places/)
19. Google Places API • Place Searches return a list of Places based on a user's location or search string. • Place Details requests return more detailed information about a specific Place, including user reviews. • Place Actions allow you to supplement the data in Google's Places Database with data from your application. You can schedule Events, add and remove Places, or weight Place rankings from user activity with Place Bumps.
20. Google Places API • Places Autocomplete can be used to provide autocomplete functionality for text-based geographic searches, by returning Places as you type. • Query Autocomplete can be used to provide a query prediction service for text-based geographic searches, by returning suggested queries as you type.
21. Getting API Key • Go to Google APIs console (http://code. google.com/apis/console) • Create an API Project • Select Services • Turn on Places API
22. Places Search • Nearby Search by location (latitude, longitude) • Text Search by search query (e.g. "pizza in Bacolod")
23. Nearby Search Syntax Syntax: https://maps.googleapis. com/maps/api/place/nearbysearch/output? parameters Output: Either json or xml
24. Nearby Search Required Parameters • key API Key • location latitude, longitude • radius distance in meters, maximum of 50, 000 m • sensor (true/false) if request came from location sensor (GPS)
25. Nearby Search Optional Parameters keyword - content language - language code name - name rankby - prominence or distance *if rankby=distance, radius should not be included types pagetoken
26. Place Search Types Separated by | Examples: food restaurant convenience_store hospital school grocery_or_supermarket More at: https://developers.google. com/places/documentation/supported_types
27. Example • Place Search: https://maps.googleapis. com/maps/api/place/nearbysearch/json? location=loc_here&sensor=true&radius=500&ke y=key_here • Type=food https://maps.googleapis. com/maps/api/place/nearbysearch/json? location=loc_here&sensor=true&radius=500&typ es=food&key=key_here
28. Foursquare API (https: //developer.foursquare. com)
29. Foursquare API Core API: Check in, view their history, see where their friends are, create tips and lists, search for and learn more about venues, and access specials and recommendations. Real-time API: Venue push API notifies venue managers when users check in to their venues, and our user push API notifies developers when their users check in anywhere.
30. Foursquare API Merchant Platform: Allows developers to write applications that help registered venue owners manage their foursquare presence and specials. Venues Platform: Search for places and access a wealth of information about them, including addresses, popularity, tips, and photos.
31. Foursquare Venues Search Search Foursquare database and find information including tips, photos, check-in counts, and here now Syntax: https://api.foursquare.com/v2/venues/search
32. Venues Search Parameters Required Parameters: • ll (latitude, longitude) - user's location or • near (text) - place where to search • v (YYYYMMDD) indicates that the client is up to date as of the specified date
33. Venues Search Parameters Optional Parameters: • query - name of place to search • limit - number of results (max is 50) • radius - distance in meters (max is 10,000) • categoryId - comma-separated categories to limit search
34. Foursquare Demo HTTP Request: https://api.foursquare.com/v2/venues/search? ll=40.7,-74 &oauth_token=0445ZMNU5XS4JDAURLRE3M ARL222RVJITL2XBKF0CR1C2EWR&v=20121 102 Android Project: * Sample Android Project is available at https://github.com/jomartigcal/lbs-android- sample
35. Foursquare Demo
36. Deadline: November 30, 2012 Google Places API Challenge 2012 http://developers.google.com/places/challenge/
37. December 1, 2012 Foursquare Hack Day Philippines http://hackday.webgeek.ph/
38. Resources • http://developer.android. com/reference/android/location/package- summary.html • http://developer.android. com/guide/topics/location/index.html • https://developers.google.com/places/ • https://developer.foursquare.com • https://github.com/jomartigcal/lbs-android- sample
39. Questions? Image Source: http://www.smoblog.com/
40. Thank you very much!
41. Location-Based Services on Android Jomar Tigcal GDG DevFest Bacolod 2012 November 5, 2012