Location in Android

Presentation given at GDGDevFest NL 2013. Presentation about available location services in android and how to use them. Including a basic overview of how mobile devices use GPS to get your location.

Transcript

1. http://www.egeniq.com info@egeniq.com @egeniq GDG DevFest The Netherlands, 2013/10/19 Thijs Damen Location Services in Android Thursday, October 31, 13
2. Almost everyone uses location 2 Thursday, October 31, 13
3. 3 Thursday, October 31, 13
4. 4 Thursday, October 31, 13
5. What is a location? 5 Thursday, October 31, 13
6. What is a location? Latitude and Longitude 5 Thursday, October 31, 13
7. What is a location? 6 We are currently at Latitude: 52.355990; Longitude: 4.953139 Thursday, October 31, 13
8. Location sources in android 7 Thursday, October 31, 13
9. Location sources in Android 8 Thursday, October 31, 13
10. Location sources in Android •GPS 8 Thursday, October 31, 13
11. Location sources in Android •GPS 8 Thursday, October 31, 13
12. Location sources in Android •GPS •Wireless networks (WiFi, Cellular) 8 Thursday, October 31, 13
13. GPS (Global Positioning System) 9 Thursday, October 31, 13
14. GPS (Global Positioning System) ‣Uses satellites 9 Thursday, October 31, 13
15. GPS (Global Positioning System) ‣Uses satellites ‣Slow TTFF 9 Thursday, October 31, 13
16. GPS (Global Positioning System) ‣Uses satellites ‣Slow TTFF ‣High battery usage 9 Thursday, October 31, 13
17. GPS (Global Positioning System) ‣Uses satellites ‣Slow TTFF ‣High battery usage ‣Good accuracy (some issues with obstruction) 9 Thursday, October 31, 13
18. Wireless networks 10 Thursday, October 31, 13
19. Wireless networks ‣Uses WiFi and Cellular towers 10 Thursday, October 31, 13
20. Wireless networks ‣Uses WiFi and Cellular towers ‣Fast TTFF (time to first fix) 10 Thursday, October 31, 13
21. Wireless networks ‣Uses WiFi and Cellular towers ‣Fast TTFF (time to first fix) ‣“Low” battery usage 10 Thursday, October 31, 13
22. Wireless networks ‣Uses WiFi and Cellular towers ‣Fast TTFF (time to first fix) ‣“Low” battery usage ‣“Poor” accuracy 10 Thursday, October 31, 13
23. How does GPS work 11 Thursday, October 31, 13
24. How does GPS work 11 Thursday, October 31, 13
25. How does GPS work 11 Thursday, October 31, 13
26. How does GPS work 11 Thursday, October 31, 13
27. WiFi and cellular positioning 12 Thursday, October 31, 13
28. WiFi and cellular positioning ‣WiFi 12 Thursday, October 31, 13
29. WiFi and cellular positioning ‣WiFi • Visible MAC addresses 12 Thursday, October 31, 13
30. WiFi and cellular positioning ‣WiFi • Visible MAC addresses • Huge database of known WiFi locations 12 Thursday, October 31, 13
31. WiFi and cellular positioning ‣WiFi • Visible MAC addresses • Huge database of known WiFi locations ‣Cellular 12 Thursday, October 31, 13
32. WiFi and cellular positioning ‣WiFi • Visible MAC addresses • Huge database of known WiFi locations ‣Cellular • Signal strength 12 Thursday, October 31, 13
33. WiFi and cellular positioning ‣WiFi • Visible MAC addresses • Huge database of known WiFi locations ‣Cellular • Signal strength • Bearing 12 Thursday, October 31, 13
34. Location services in android 13 Thursday, October 31, 13
35. Androids location services 14 Thursday, October 31, 13
36. Androids location services Location Manager ‣ Available from API level 1 ‣ Selective provider use 14 Play Services ‣ Available from API level 8 (2.2) ‣ Requires Play Store ‣ Fused providers ‣ Utilizes sensor data ‣ Single API to maintain Thursday, October 31, 13
37. What is the location object • Accuracy • Altitude • Bearing • Latitude & Longitude • Provider • Speed • Time • distanceTo(Location location) • bearingTo(Location location) 15 Thursday, October 31, 13
38. Let’s see the dirty stuff 16 Thursday, October 31, 13
39. The bare basics 17 Thursday, October 31, 13
40. The bare basics Permissions 17 Wireless & Cellular GPS <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> Thursday, October 31, 13
41. The location manager android.location.LocationManager getLastKnownLocation(...); requestLocationUpdates(...); requestSingleUpdate(...); Filter with: Provider or Criteria 18 Thursday, October 31, 13
42. Play services location API com.google.android.gms. location.LocationClient getLastLocation(); requestLocationUpdates(...); Filter with: LocationRequest 19 Thursday, October 31, 13
43. Balancing performance and accuracy 20 Thursday, October 31, 13
44. Balancing performance and accuracy Location Manager ‣ Select provider • Time interval • Distance filter 20 Thursday, October 31, 13
45. Balancing performance and accuracy Location Manager ‣ Select provider • Time interval • Distance filter ‣ Criteria • Accuracy requirement • Power requirement 20 Thursday, October 31, 13
46. Balancing performance and accuracy Location Manager ‣ Select provider • Time interval • Distance filter ‣ Criteria • Accuracy requirement • Power requirement 20 Play Services ‣ LocationRequest • Priority • Expiration duration • Expiration time • Interval • Fastest interval • Maximum number of updates • Distance filter Thursday, October 31, 13
47. Balancing performance and accuracy “Worst app ever!” 21 - Random internet guy Thursday, October 31, 13
48. Best case scenario 22 Thursday, October 31, 13
49. Best case scenario ‣Location Manager • Use the passive provider ‣Play Services • Use the ‘no-power’ priority 22 Thursday, October 31, 13
50. Think before you code 23 Thursday, October 31, 13
51. Think before you code • The client is not always right 23 Thursday, October 31, 13
52. Think before you code • The client is not always right • Meet your requirements as elegant as possible 23 Thursday, October 31, 13
53. Think before you code • The client is not always right • Meet your requirements as elegant as possible • Give your users control 23 Thursday, October 31, 13
54. Extra features 24 Thursday, October 31, 13
55. Extra features ‣LocationManager • Geofencing ‣Play Services • Geofencing APIs • Activity recognition APIs 24 Thursday, October 31, 13
56. Geofencing with the LocationManager 25 Thursday, October 31, 13
57. Geofencing with the LocationManager ‣LocationManager.addProximityAlert(); • Uses latitude, longitude and radius • Triggers both on entering and exiting the given area 25 Thursday, October 31, 13
58. Geofencing with Play Services 26 Thursday, October 31, 13
59. Geofencing with Play Services ‣Geofence.Builder() • Transition type (enter / exit) • Radius (latitude, longitude and radius) • Expiration duration ‣LocationClient • addGeofences(); 26 Thursday, October 31, 13
60. ActivityRecognition 27 com.google.android.gms. location.ActivityRecognitionClient requestActivityUpdates(); Results in: ActivityRecognitionResult getMostProbableActivity(); getProbableActivities(); <uses-permission android:name="com.google.android.gms.permission.ACTIVITY_RECOGNITION" /> Thursday, October 31, 13
61. Thank you! Questions? http://www.egeniq.com info@egeniq.com @egeniq http://www.egeniq.com thijs@egeniq.com @thijsdamen Thursday, October 31, 13