Google Maps api v2 android：如何删除单个标记？

Question

In my app i need to have 2 types of markers: the first ones need to stay on a location and the second ones need to move, right now I dont have the static markers yet but my app can show a marker moving if the location of the phone changes but for that i call mMap.clear(), I dont want to clear all markers when the location changes so I need to remove only that marker, I read in another question that I need to use Marker.remove(); to remove individual markers but im not sure where to implement that in the code.

Here is the method for a new location:

public void onLocationChanged(Location location) {
    mMap.clear();
    GetLatLong();
    handleNewLocation(location);
    mCurrentLocation = location;


}

and here is the handleNewLocation method:

    private void handleNewLocation(Location location) {
    if (mLastLocation != null) {

        LatLng latLng = new LatLng(list.get(0), list.get(1));
        //mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));


        //añadir un nuevo marker con la posición de la variable latLng
        MarkerOptions camion = new MarkerOptions()
                .position(latLng)
                .title("Camión")
                .snippet("ruta " + ruta)
                .icon(BitmapDescriptorFactory.fromResource(R.drawable.bus));


        Marker marker = mMap.addMarker(camion);
        if (marker == null) {
            mMap.addMarker(camion);
        } else {
            camion.position(latLng);

        }

    }
}

Thank you.

EDIT:

List<Marker> markers = new ArrayList<Marker>();
@Override
public void onLocationChanged(Location location) {
    markers.clear();
    GetLatLong();
    handleNewLocation(location);
    mCurrentLocation = location;
}
private void handleNewLocation(Location location) {
    if (mLastLocation != null) {

        LatLng latLng = new LatLng(list.get(0), list.get(1));
        //mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));


        //añadir un nuevo marker con la posición de la variable latLng
        MarkerOptions camion = new MarkerOptions()
                .position(latLng)
                .title("Camión")
                .snippet("ruta " + ruta)
                .icon(BitmapDescriptorFactory.fromResource(R.drawable.bus));


        Marker marker = mMap.addMarker(camion);

        if (marker == null) {

            markers.add(marker);
        } else {
            camion.position(latLng);

        }

    }
}

}

Answer 1

If you want to remove one marker - you have to remember this marker first. Then call marker.remove() .

Code:

class YourClass {
    Marker singleMarker; //marker to be removed

    public void addMarker() {
        ....
        //here you add your marker
        singleMarker = mMap.addMarker(camion);
    }

    public void removeSingleMarker() {
        if(singleMarker != null) {
            singleMarker.remove();
            singleMarker = null;
        }
    }
}

Answer 2

As I discussed above, you can try to save the what-you-want-remove marker in an ArrayList or in a HashMap .

Sample code:

// before loop:
List<Marker> markers = new ArrayList<Marker>();

// inside your loop:
Marker marker = myMap.addMarker(new MarkerOptions().position(new LatLng(geo1Dub,geo2Dub))); //...
markers.add(marker);

// after loop:
markers.size();