Google地图每次更新都会添加新标记

Question

已经尝试了一段时间来解决我的地图问题，这是标记。每次地图更新时，都会添加一个新标记。这会在同一位置留下几个标记。

我希望在添加其他内容（如路线）之前对其进行排序。

    public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;


    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        return;// 
    }
    mMap.setMyLocationEnabled(true); // shows location on map
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    listener = new LocationUpdateListener();
    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, listener);
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, listener);
}
private void handleNewLocation(Location location) {
    Log.d(TAG, location.toString());

    double currentLatitude = location.getLatitude();
    double currentLongitude = location.getLongitude();

    LatLng latLng = new LatLng(currentLatitude, currentLongitude);

    MarkerOptions options = new MarkerOptions() // This adds in a marker
            .position(latLng)
            .title("Reverse Geo Toast here ???"); // when marker clicked, it will display you are here
    mMap.addMarker(options);
   // mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
    float zoomLevel = (float) 10; //This zooms into the marker
    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, zoomLevel));
}