I have a page(fragment) that shows google maps together with 1 marker icon. So now i would like to pass source and destination coordinates to this map so that it can show the shortest route together with the distance in Km. E.g i want the map to show the blue path in the image below :
Here is my code :
private void SetUpMap()
{
if (GMap == null)
{
ChildFragmentManager.FindFragmentById<MapFragment>(Resource.Id.googlemap).GetMapAsync(this);
}
}
public void OnMapReady(GoogleMap googleMap)
{
this.GMap = googleMap;
GMap.UiSettings.ZoomControlsEnabled = true;
LatLng latlng = new LatLng(Convert.ToDouble(gpsLatitude), Convert.ToDouble(gpsLongitude));
CameraUpdate camera = CameraUpdateFactory.NewLatLngZoom(latlng, 15);
GMap.MoveCamera(camera);
MarkerOptions options = new MarkerOptions()
.SetPosition(latlng)
.SetTitle("Chennai");
GMap.AddMarker(options);
}
I got my answer from this post :
Adding polyline between two locations google maps api v2
I converted the java code to C# and it worked fine.
Related
var _locator = CrossGeolocator.Current;
var mapPosition = await _locator.GetPositionAsync();
var mapSpan = MapSpan.FromCenterAndRadius(
new Xamarin.Forms.Maps.Position(mapPosition.Latitude, mapPosition.Longitude),
Distance.FromMiles(2)
);
Map.MoveToRegion(mapSpan);
Using Xamarin.Forms.Maps.Postion() the correct lat and lon coordinates are calculated.
However, when I add it to MapSpan, the coordinates change to somewhere in the middle of the Atlantic ocean. Not sure what is causing this?
UPDATE:
So the problem is definitely in the Android project. For some reason, GoogleMaps is not recognizing the location passed by the Map Renderer in the shared project. OnMapReady is just using the default lat/lon.
SUCCESS!!!
async Task<Plugin.Geolocator.Abstractions.Position> GetPositionAsync()
{
var _locator = CrossGeolocator.Current;
Plugin.Geolocator.Abstractions.Position myPosition = await _locator.GetPositionAsync();
return myPosition;
}
public void OnMapReady(GoogleMap googleMap)
{
Plugin.Geolocator.Abstractions.Position myPosition = Task.Run(GetPositionAsync).Result;
map = googleMap;
map.MoveCamera(
CameraUpdateFactory.NewLatLng(
new LatLng(myPosition.Latitude, myPosition.Longitude)));
map.AnimateCamera(
CameraUpdateFactory.ZoomTo(10));
The MapSpan properties LatitudeDegree and LongitudeDegrees refer to the degrees of latitude and longitude that are spanned (i.e. the number of degrees of the map that are shown within its view.)
If you are looking for the lat/lng of the center of the map in your span, refer to the Center properties which is a Maps.Postion object.
Re: https://developer.xamarin.com/api/type/Xamarin.Forms.Maps.MapSpan/
Example:
var mapPosition = new Position(38.29, -77.45);
var mapSpan = MapSpan.FromCenterAndRadius(mapPosition, Distance.FromMiles(2));
map.MoveToRegion(mapSpan);
I am working in Xamarin Android, I want to set clickable poly line on google map, am using this below code:
GoogleMap.IOnPolylineClickListener
Code:
var polylineoption = new PolylineOptions();
polylineoption.InvokeColor(Android.Graphics.Color.Blue);
polylineoption.Geodesic(true);
polylineoption.Clickable(true);
polylineoption.Add(latLngPoints);
RunOnUiThread(() =>
map.AddPolyline(polylineoption));
public void OnPolylineClick(Polyline polyline)
{
throw new NotImplementedException();
}
I have two markers, namely startLocation and the other is stopLocation. startLocation will detect the user's current location, and then the user will walk, and when they stop they'll press stop and stopLocation will be captured as their new current location. I want to draw a polyline as the user is moving from the startLocation to stopLocation.
Alternatively, the polyline can also be drawn after both markers for start and stop location has been created - whichever is more implementable.
How can this be done? Most of the answers refer to retrieving routes and then drawing the polylines, but that's not what I want - I want to get the user's personalized route. In short, I want to record the route the user has taken. I've managed to create both markers already:
btnStart = (Button) findViewById(R.id.btnStart);
btnStart.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
// Create Start Marker
// get current location
LocationManager locManager;
String context = Context.LOCATION_SERVICE;
locManager = (LocationManager) getSystemService(context);
Criteria c = new Criteria();
c.setAccuracy(Criteria.ACCURACY_FINE);
c.setAltitudeRequired(false);
c.setBearingRequired(false);
c.setCostAllowed(true);
c.setPowerRequirement(Criteria.POWER_LOW);
String provider = locManager.getBestProvider(c, true);
Location loc = locManager.getLastKnownLocation(provider);
LatLng currentPosition = updateWithNewLocation(loc);
Marker startLocation = map.addMarker(new MarkerOptions()
.position(currentPosition)
.title("Start Location")
.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));
map.moveCamera(CameraUpdateFactory.newLatLngZoom(currentPosition, 17));
}
});
btnStop = (Button) findViewById(R.id.btnStop);
btnStop.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
// Create Stop
// get current location
LocationManager locManager;
String context = Context.LOCATION_SERVICE;
locManager = (LocationManager) getSystemService(context);
Criteria c = new Criteria();
c.setAccuracy(Criteria.ACCURACY_FINE);
c.setAltitudeRequired(false);
c.setBearingRequired(false);
c.setCostAllowed(true);
c.setPowerRequirement(Criteria.POWER_LOW);
String provider = locManager.getBestProvider(c, true);
Location loc = locManager.getLastKnownLocation(provider);
LatLng currentPosition = updateWithNewLocation(loc);
Marker stopLocation = map.addMarker(new MarkerOptions()
.position(currentPosition)
.title("Stop Location")
.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE)));
map.moveCamera(CameraUpdateFactory.newLatLngZoom(currentPosition, 17));
// Draw dynamic line
}
});
Now all I need is to draw the line between the two markers. Thanks!
There is no way to do this without tracking the user's location. You should use the requestLocationUpdates function to listen and get the update of your user's location. Refer to the developer guide for more information on listening to the GPS location.
String locationProvider = LocationManager.NETWORK_PROVIDER;
// Or, use GPS location data:
// String locationProvider = LocationManager.GPS_PROVIDER;
locationManager.requestLocationUpdates(locationProvider, 0, 0, locationListener);
You might also want to use the snap to road function in the newly released Google Maps Road API, to fix your raw lat/lng from GPS, and get a smoother path on the road. It does not currently have Android APIs, so you might need to use the Web API to access the snap to road service.
https://roads.googleapis.com/v1/snapToRoads?path=-35.27801,149.12958|-35.28032,149.12907|-35.28099,149.12929|-35.28144,149.12984|-35.28194,149.13003|-35.28282,149.12956|-35.28302,149.12881|-35.28473,149.12836
&interpolate=true
&key=API_KEY
After users stopped tracking or reached the end point, you can create a polyline based on their path.
// Instantiates a new Polyline object and adds points to define a rectangle
PolylineOptions rectOptions = new PolylineOptions()
.add(new LatLng(37.35, -122.0))
.add(new LatLng(37.45, -122.0)) // North of the previous point, but at the same longitude
.add(new LatLng(37.45, -122.2)) // Same latitude, and 30km to the west
.add(new LatLng(37.35, -122.2)) // Same longitude, and 16km to the south
.add(new LatLng(37.35, -122.0)); // Closes the polyline.
// Get back the mutable Polyline
Polyline polyline = myMap.addPolyline(rectOptions);
Let me know if it is not clear, and hope it helps.
I have a very simple question.
Is there a way to add multiple polygons to PrimeFaces GMap?
If yes, can someone share a snippet/example?
If no, are there any alternatives to GMap in JSF?
Any help will be appreciated! Thanks
The first sentence in the link you provided gives you the answer:
Any number of polygons can be displayed on map.
I would do it the following way:
#ManagedBean
public class PolygonsView implements Serializable {
private MapModel polygonModel;
#PostConstruct
public void init() {
polygonModel = new DefaultMapModel();
//Shared coordinates
LatLng coord1 = new LatLng(36.879466, 30.667648);
LatLng coord2 = new LatLng(36.883707, 30.689216);
LatLng coord3 = new LatLng(36.879703, 30.706707);
//Polygon
Polygon polygon = new Polygon();
polygon.getPaths().add(coord1);
polygon.getPaths().add(coord2);
polygon.getPaths().add(coord3);
polygon.setStrokeColor("#FF9900");
polygon.setFillColor("#FF9900");
polygon.setStrokeOpacity(0.7);
polygon.setFillOpacity(0.7);
polygonModel.addOverlay(polygon);
//here it should be possible to add additional overlays
}
public MapModel getPolygonModel() {
return polygonModel;
}
}
The source code is also from the link you provided. Just create more Polygons and add them as overlay to your MapModel.
When i setLocationSource, Google Map will display the blue icon automatically. Anyone know how to remove the blue icon??
Thanks.
Something like that
There is my coding:
private Marker myLocation = null;
private void prepareMapSetting(GoogleMap aGoogleMap)
{
aGoogleMap.setLocationSource(mLocationSource);
aGoogleMap.setOnMyLocationChangeListener(mOnMyLocationChangeListener);
aGoogleMap.setOnMapLongClickListener(mOnMapLongClickListener);
aGoogleMap.setMyLocationEnabled(true);
}
private OnMapLongClickListener mOnMapLongClickListener = new OnMapLongClickListener()
{
#Override
public void onMapLongClick(LatLng point)
{
if(null != mOnLocationChangedListener){
if(null == myLocation){
myLocation = getMap().addMarker(new MarkerOptions()
.position(point)
.title("You")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN)));
}
else{
myLocation.setPosition(point);
}
Location location = new Location("LongPressLocationProvider");
location.setLatitude(point.latitude);
location.setLongitude(point.longitude);
mOnLocationChangedListener.onLocationChanged(location);
}
}
};
I'm not sure to understand your question (I don't see your image too).
In fact setLocationSource is just to set the location source of the mylocation layer (i.e., the blue dot...)
if you don't want the blue dot, just put
aGoogleMap.setMyLocationEnabled(false);
and don't use the locationSource