Add bookmarks without reloading Android map

Good afternoon! I was already googling to know if there is any way to add a bookmark to a map without having to reload onMapReady.

This is what I tried: With the following code I execute Alerts which is a WS that is returning me a series of Lat / Long positions every 5 seconds

   public void viewAlertas() {
    AppLog.Log("", "refresmap");

    scheduleTaskExecutor = Executors.newScheduledThreadPool(0);

    scheduleTaskExecutor.scheduleAtFixedRate(new Runnable() {
        @Override
        public void run() {
            getActivity().runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Alerts();                    }

            });
        }


    }, 0, 5, TimeUnit.SECONDS);
}

I have the positions in a list called coords and I go through that list to paint the marker

@Override
public void onMapReady(GoogleMap googleMap) {


    map = googleMap;


    AppLog.Log("", "ResponseAlert2 :" + coords);

    for (int i = 0; i < coords.size(); i++) {
        map.addMarker(new MarkerOptions()
                .position(new LatLng(coords.get(i).latitude,coords.get(i).longitude))
                .title(mylistnombre.get(i))
                .snippet(myIdAlertWalker.get(i)));
        AppLog.Log("Marker", "Punto " + coords);

    }
    double latitudeInicial= Double.parseDouble(TrakingApplication.preferenceHelper.getLatWalker());
    double longitudeInicial= Double.parseDouble(TrakingApplication.preferenceHelper.getLonWalker());
    AppLog.Log("Marker","Punto "+ latitudeInicial + " " + longitudeInicial);

    // Cámara
    googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(latitudeInicial, longitudeInicial),13));

    // Eventos
    googleMap.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener() {
        @Override
        public void onInfoWindowClick(Marker marker) {

            TrakingApplication.preferenceHelper.putIdAlertWalker(marker.getSnippet());
           Intent intent =  new Intent(getActivity(), Polyline.class);
            startActivity(intent);
        }
    });

}

When you paint the markers for the first time and after 5 seconds you run again Alerts you need to refresh the map, try

getFragmentManager().beginTransaction().detach(this).attach(this).commit();

Someone will have an idea of how it is done and could help me.

Thank you.