private Runnable batchAddMarkersRunnable = new Runnable() {
        private static final int ADD_IN_BATCH = 1;
        private static final int DELAY = 100;
        private LatLng previousCameraPosition;
        @Override
        public void run() {

            if (mCount == 0) {
                return;
            }

            sortPositionsIfNeeded();

            for (int i = 0; i < ADD_IN_BATCH && mCount > 0; i++) {
                mCount--;
                MapViewHolder item = arrayCameras[mCount];
                arrayCameras[mCount] = null;
                if(item != null) {
                    if(!isMarkerOnArray(mMap.getMarkers(), item.camera)) {
                        mMap.addMarker(getMarkerForItem(item.camera));
                    }
                }
            }

            handler.postDelayed(this, DELAY);
        }

        private void sortPositionsIfNeeded() {
            final LatLng cameraPosition = mMap.getCameraPosition().target;
            if (previousCameraPosition == null || LatLngUtils.distanceSquared(previousCameraPosition, cameraPosition) > 400.0) {
                previousCameraPosition = cameraPosition;
                for (int i = 0; i < mCount; i++) {
                    MapViewHolder p = arrayCameras[i];
                    p.distance = LatLngUtils.distanceSquared(cameraPosition, new LatLng(p.camera.getLatitude(), p.camera.getLongitude()));
                }
                Arrays.sort(arrayCameras, 0, mCount, new Comparator<MapViewHolder>() {
                    public int compare(MapViewHolder lhs, MapViewHolder rhs) {
                        return Double.compare(rhs.distance, lhs.distance);
                    }
                });
            }
        }

    };