CODEWITHSUNDEEP
androidgoogle-maps-android-api-2
DeadManSpirit
DeadManSpirit

Reputation: 2096

Google Maps Android API v2, how to remove Polylines from the map?

I am trying to remove previously added Polyline and redraw new Polyline when the location has been changed. I tried both

this.routeToDestination.setPoints(pointsToDestination) and this.routeToDestination.remove()

but neither of them worked.

I followed How to draw a dynamic line (route) with Google Maps Android API v2 but could not resolved the issue

    @Override
    public void onResume() {
        super.onResume();

        routeToDestination = mMap.addPolyline(new PolylineOptions()
                .add(new LatLng(location.getLatitude(), location.getLongitude()),
                        new LatLng(this.destinationLatitude, this.destinationLongitude))
                .width(1)
                .color(Color.DKGRAY)

        );
    }

   @Override
    public void onLocationChanged(Location location) {

        List<LatLng> pointsToDestination = new ArrayList<LatLng>();
        pointsToDestination.add(new LatLng(location.getLatitude(), location.getLongitude()));
        pointsToDestination.add(new LatLng(destinationLatitude, destinationLongitude));

        this.routeToDestination.setPoints(pointsToDestination);
    }

}

Upvotes: 18

Views: 23906

Answers (3)

moon
moon

Reputation: 333

The Simplest way to do that

implementation 'com.akexorcist:google-direction-library:1.2.1'

Use this library Get an API key from

https://developers.google.com/maps/documentation/directions/get-api-key

You must enable the billing method for this for direction API.

https://console.cloud.google.com/projectselector2/billing/enable

Set this code in any function but not in the onmapready function

 String serverKey = "YOUR_API_KEY";
      GoogleDirection.


        GoogleDirection.withServerKey(serverKey)
                .from(new LatLng(30.677717,73.106812))
                .to(new LatLng(31.345394,73.429810))
                .transitMode(TransportMode.WALKING)
                .unit(Unit.METRIC)
                .execute(new DirectionCallback() {
                    @Override
                    public void onDirectionSuccess(@Nullable Direction direction) {


                        Log.d("eeeeee", direction.getStatus());

                        if(direction.isOK()) {
                            // Do something
                            Route route = direction.getRouteList().get(0);
                            Leg leg = route.getLegList().get(0);

                            ArrayList<LatLng> directionPositionList = leg.getDirectionPoint();
                            Log.d("eeeeee", directionPositionList.size()+"eeeeee");
                            if (polylineOptions_final!=null)
                            {
                                polylineOptions_final.remove();
                            }
                            PolylineOptions polylineOptions = DirectionConverter.createPolyline(getApplication(), directionPositionList, 10, Color.RED);
                            polylineOptions_final = mMap.addPolyline(polylineOptions);
                        } else {
                            // Do something
                        }
//                        Log.d("eeeeee"+direction.getGeocodedWaypointList().toString(), "onDirectionSuccess: ");


                    }

                    @Override
                    public void onDirectionFailure(@NonNull Throwable t) {
                        Toast.makeText(ClientMap.this, "d"+t.getMessage().toLowerCase(), Toast.LENGTH_SHORT).show();

                    }
                });

new LatLng(31.345394,73.429810));

Upvotes: 1

moon
moon

Reputation: 333

Make a Member variable in map activity of polyline

    Polyline polyline_final = null;

Every time when a polyline is added to map than assign value of map like this

polyline_final = mMap.addPolyline(polylineOptions);

And next to make new polyline at same time remove the previous polyline form map Apply this if condition before polyline_final = mMap.addPolyline(polylineOptions);

if (polylineOptions_final!=null)
                        {
                            polylineOptions_final.remove();
                        }

Now this is done

Upvotes: 0

Rawa
Rawa

Reputation: 13936

To remove a polyline you should simply use remove() method as stated in the API.

//Add line to map
Polyline line = mMap.addPolyline(new PolylineOptions()
            .add(new LatLng(location.getLatitude(), location.getLongitude()),
                    new LatLng(this.destinationLatitude, this.destinationLongitude))
            .width(1)
            .color(Color.DKGRAY)

//Remove the same line from map
line.remove();

Upvotes: 47

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