Vfrdtyky

I have created an app that displays different tracks in a park. I have created two markers which represent the start and end of the track. I am getting a problem where when I change tracks, the marker from the previous track still shows. I tried map.clear() but that removed everything. I want to not show the markers from the previous track.

private void createMarker(double latitude, double longitude, String title) {

    map.addMarker(new MarkerOptions()

            .position(new LatLng(latitude, longitude))

            .title(title)

            .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_YELLOW)));

}



private void updateMapTrack() {

    switch (options.getTrack()) {

        case TRACK1:

            createMarker(-45.85696303760779, 170.5199563062967, "Start of track1.");

            createMarker(-45.85808344124618, 170.5247490755895, "End of track1.");

            map.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(-45.856895, 170.518673), (float) 17.8));

            break;



        case TRACK2:

            createMarker(-45.85696303760779, 170.5199563062967, "Start of track2.");

            createMarker(-45.85808344124618, 170.5247490755895, "End of track2.");

            map.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(-45.857144, 170.522713), (float) 16.32));

            break;



        case TRACK3:

            createMarker(-45.85714008365828, 170.5193834664067, "Start of track3.");

            createMarker(-45.85751258570694, 170.526808129631, "End of track3.");

            map.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(-45.858164, 170.523111), (float) 16));

            break;

    }

}

You will have to keep the reference to the Marker Object you created and then you have to call

[Marker Reference].remove() method to remove it from the GoogleMap.
for Example:

Create Marker like this and save the reference:

Marker startTrackMarker = createMarker(-45.85696303760779, 170.5199563062967, "Start of track1.");

And that is how you will remove:

startTrackMarker.remove()

And your createMarker method will be changed like this:

private Marker createMarker(double latitude, double longitude, String title) {

        return map.addMarker(new MarkerOptions()

                .position(new LatLng(latitude, longitude))

                .title(title)

                .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_YELLOW)));

    }

Note:

If you have multiple markers then you will need an array to hold all the references to the markets like this:

ArrayList<Marker> markers = new ArrayList<>();

and then to remove these markers you will have to iterate the array and call remove() on every marker object. (Otherwise, it all depends upon your logic).