Pfthb

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).