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Google Maps API for Android

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Presenting use of Maps, distance calculation, geolocation. …

Presenting use of Maps, distance calculation, geolocation.

Code examples.

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Transcript

  • 1. Google Maps API Brief introduction Maksim Golivkin www.androidaalto.org www.mobileguild.eu Twitter: MaksimGolivkin 13.11.2010 Android Aalto Community
  • 2. Plan 13.11.2010 Android Aalto Community Intro to Google Maps API MapView & MapActivity Overlays Distances Balloons Geocoding UI update with handlers
  • 3. Intro to maps API: New Project 13.11.2010 Android Aalto Community Target build and emulator have to use Google API for platform you have chosen. For instance, Google API for 1.6
  • 4. Intro to maps API : AndroidManifest.xml 13.11.2010 Android Aalto Community Things to remember: uses-library declaration for runtime; permissions to access Internet and location services.
  • 5. MapView: Layout 13.11.2010 Android Aalto Community If inappropriate API key is used, map isn't displayed. For one Google account one can generate several keys. How to generate your own: http://code.google.com/android/add-ons/google-apis/mapkey.html
  • 6. MapActivity onCreate 13.11.2010 Android Aalto Community
  • 7. Overlays 13.11.2010 Android Aalto Community Each overlay is information layer on the map. Google Maps has 3 overlay classes (main purpose below): Overlay - drawing complex figures on the map and capturing touch moves. ItemizedOverlay - abstract, extends Overlay, for drawing of multiple markers. MyLocationOverlay - to display user location on the map.
  • 8. Overlays: hierarchy 13.11.2010 Android Aalto Community
  • 9. Overlays: ItemizedOverlay #1 13.11.2010 Android Aalto Community Most important thing: on every content change call protected populate method; include populate call in constructor Reference: http://code.google.com/p/android/issues/detail?id=2035
  • 10. Overlays: ItemizedOverlay #2 13.11.2010 Android Aalto Community
  • 11. Overlays: ItemizedOverlay usage 13.11.2010 Android Aalto Community
  • 12. Overlays: MyLocationOverlay 13.11.2010 Android Aalto Community Convenient to display user location on map. Most important thing: call disableMyLocation and disableCompass (if enabled), when activity goes to background.
  • 13. Overlays: MyLocationOverlay usage 13.11.2010 Android Aalto Community
  • 14. Distance 13.11.2010 Android Aalto Community Note: Google Maps API uses (int) micro-degrees for coordinates; Android Location package uses (double) degrees for coordinates; microdegrees = degrees * 1000 000; or microdegrees = degress * 1E6; degrees = microdegrees / (double)1E6;
  • 15. Distance calculation 13.11.2010 Android Aalto Community
  • 16. Balloons : usage 13.11.2010 Android Aalto Community
  • 17. Balloons 13.11.2010 Android Aalto Community Nice small existing library. Available at: https://github.com/jgilfelt/android- mapviewballoons
  • 18. Geocoding 13.11.2010 Android Aalto Community Geocoding - translating coordinates to address. Reverse geocoding - translating address from coordinates. GeoCoder class. Do geocoding in background thread!
  • 19. UI update with Handler 13.11.2010 Android Aalto Community Nested anonymous classes are ugly! Alternative: Handler + Message + Bundle. Note: when updating UI, be sure to instantiate Handler (or Handler child class) in UI thread. For example, in onCreate method.
  • 20. Thank you! 13.11.2010 Android Aalto Community Example code can be found at: http://mobileguild.eu/code/FindHackatron.zip