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Android: Google Maps Marker

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This is part of a much larger class but I wanted to give enough context to explain the value of GeoCoder. GeoCoder has two methods called getFromLocation() and getFromLocationName() that allow you to capture an address or coordinates.

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  1. /**********************************
  2. 		 * Fired every time a user touches the map
  3. 		 * MotionEvent.getAction() lets you determine 
  4. 		 *   whether a user has lifted their finger
  5. 		**********************************/
  6. 		@Override
  7. 		public boolean onTouchEvent(MotionEvent e, MapView mapView) {
  8. 			if( e.getAction() == 1 ){
  9. 				//getProjection() returns screen-pixel coords to lat/lng coordinates
  10. 				//fromPixels converts the screen coordinates into a GeoPoint
  11. 				GeoPoint geoPoint = mapView.getProjection().fromPixels(
  12. 						(int) e.getX(),
  13. 						(int) e.getY() ); 
  14.  
  15. 				/*
  16. 				Toast.makeText( getActivity(), 
  17. 						"Location: " + geoPoint.getLatitudeE6() / 1E6 + ", " + 
  18. 						geoPoint.getLongitudeE6() / 1E6, 
  19. 						Toast.LENGTH_SHORT).show();
  20. 				*/
  21.  
  22. 				//Geocoder converts lat/lng into an address
  23. 				Geocoder geocoder = new Geocoder( getActivity(), Locale.getDefault() );
  24.  
  25. 				try{
  26. 					//getFromLocation() does the reverse Geo Location
  27. 					List<Address> addresses = geocoder.getFromLocation(
  28. 							geoPoint.getLatitudeE6() / 1E6, 
  29. 							geoPoint.getLongitudeE6() / 1E6, 
  30. 							1 );
  31. 					//Capture the address in a String
  32. 					String addy = "";
  33. 					if( addresses.size() > 0 ){
  34. 						for (int i = 0; i < addresses.get(0).getMaxAddressLineIndex(); i++ ){
  35. 							addy += addresses.get(0).getAddressLine(i) + "\n";
  36. 						}
  37. 					}
  38. 					//Present the address using Toast
  39. 					Toast.makeText( getActivity(), addy, Toast.LENGTH_SHORT).show();
  40. 				}
  41. 				catch( IOException evt ){
  42. 					evt.printStackTrace();
  43. 				}
  44.  
  45. 				/**********************************
  46. 				 * Find the Geo Coordinates based on the Name
  47. 				**********************************/
  48. 				try{
  49. 					List<Address> addresses = geocoder.getFromLocationName("kusc", 5);
  50. 					String addy = "";
  51. 					if( addresses.size() > 0 ){
  52. 						geoPoint = new GeoPoint(
  53. 								(int) (addresses.get(0).getLatitude() * 1E6), 
  54. 								(int) (addresses.get(0).getLongitude() * 1E6));
  55. 						mapController.animateTo(geoPoint);
  56. 						mapView.invalidate();
  57. 					}
  58. 					//Present the address using Toast
  59. 					Toast.makeText( getActivity(), addy, Toast.LENGTH_SHORT).show();
  60. 				}catch( IOException evt){
  61. 					evt.printStackTrace();
  62. 				}
  63. 			}
  64. 			//onTouchEvent requires a boolean
  65. 			return false;
  66. 		}		
  67. 	}

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