Posted By

chrisaiv on 09/24/11

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android

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Last Edited at 09/24/11 03:18am

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Android: Google Maps Marker

/ Published in: Java

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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/**********************************
		 * Fired every time a user touches the map
		 * MotionEvent.getAction() lets you determine 
		 *   whether a user has lifted their finger
		**********************************/
		@Override
		public boolean onTouchEvent(MotionEvent e, MapView mapView) {
			if( e.getAction() == 1 ){
				//getProjection() returns screen-pixel coords to lat/lng coordinates
				//fromPixels converts the screen coordinates into a GeoPoint
				GeoPoint geoPoint = mapView.getProjection().fromPixels(
						(int) e.getX(),
						(int) e.getY() ); 
				
				/*
				Toast.makeText( getActivity(), 
						"Location: " + geoPoint.getLatitudeE6() / 1E6 + ", " + 
						geoPoint.getLongitudeE6() / 1E6, 
						Toast.LENGTH_SHORT).show();
				*/

//Geocoder converts lat/lng into an address
				Geocoder geocoder = new Geocoder( getActivity(), Locale.getDefault() );
				
				try{
					//getFromLocation() does the reverse Geo Location
					List<Address> addresses = geocoder.getFromLocation(
							geoPoint.getLatitudeE6() / 1E6, 
							geoPoint.getLongitudeE6() / 1E6, 
							1 );
					//Capture the address in a String
					String addy = "";
					if( addresses.size() > 0 ){
						for (int i = 0; i < addresses.get(0).getMaxAddressLineIndex(); i++ ){
							addy += addresses.get(0).getAddressLine(i) + "\n";
						}
					}
					//Present the address using Toast
					Toast.makeText( getActivity(), addy, Toast.LENGTH_SHORT).show();
				}
				catch( IOException evt ){
					evt.printStackTrace();
				}
				
				/**********************************
				 * Find the Geo Coordinates based on the Name
				**********************************/
				try{
					List<Address> addresses = geocoder.getFromLocationName("kusc", 5);
					String addy = "";
					if( addresses.size() > 0 ){
						geoPoint = new GeoPoint(
								(int) (addresses.get(0).getLatitude() * 1E6), 
								(int) (addresses.get(0).getLongitude() * 1E6));
						mapController.animateTo(geoPoint);
						mapView.invalidate();
					}
					//Present the address using Toast
					Toast.makeText( getActivity(), addy, Toast.LENGTH_SHORT).show();
				}catch( IOException evt){
					evt.printStackTrace();
				}
			}
			//onTouchEvent requires a boolean
			return false;
		}		
	}

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