android - Draw new clusters Google Maps Api -

i have issues calling cluster manager's cluster() method, drawing clusters when oncamerachanged event triggered.

i using same method reloading clusters when create cluster , go map fragment, cluster there time. whenever try reload clusters oncamerachange event, can see have markers, nothing getting drawn.

this method use reloading clusters :

private void reloadclusters(arraylist<checkin> checkins) {          if (checkins != null && checkins.size() > 0) {             (checkin item : checkins) {                 mclustermanager.additem(item);             }             mclustermanager.cluster();         }     } 

since need cluster items , trigger oncamerachange well, following:

getmmap().setoncamerachangelistener(mclustermanager); 

also, within map fragment, have inner class extends defaultclusterrenderer implements oncamerachange listener :

private class checkinrenderer extends defaultclusterrenderer<checkin> implements googlemap.oncamerachangelistener {  public void oncamerachange(cameraposition cameraposition) {              radius = getradius();             int zoom_level = math.round(getmmap().getcameraposition().zoom);              latlng latlng = getmmap().getcameraposition().target;             final double lat = latlng.latitude;             final double lng = latlng.longitude;              if (zoom_level > 6.5) { 

whenever zoom level smaller 6.5, query server information helps me create marker, if return not null, use reload method mentioned above result, hoping see clusters drawn.