Why cluster marker icon not showing when zoom in or zoom out in android [duplicate]

问题

I'm trying to implement a cluster marker on my map,first, it shows me the cluster marker but when i zoom in, that expand and also show white square, i'll add some images to explain it better.

images

public class MyItem implements ClusterItem {
        private final LatLng mPosition;
        String Title = "";
        int Icon;

        public MyItem(double lat, double lng, String title, int icon) {
            mPosition = new LatLng(lat, lng);
            Title = title;
            Icon = icon;
        }

        @Override
        public LatLng getPosition() {
            return mPosition;
        }

        public String getTitle() {
            return Title;
        }

        public int getIcon() {
            return Icon;
        }
    }
class OwnIconRendered extends DefaultClusterRenderer<MyItem> {


        public OwnIconRendered() {
            super(MapActivity.this, googleMap, mClusterManager);

        }

        @Override
        protected void onBeforeClusterItemRendered(MyItem item, MarkerOptions markerOptions) {
            markerOptions.icon(BitmapDescriptorFactory.fromResource(item.getIcon()));
            markerOptions.title(item.getTitle());
            super.onBeforeClusterItemRendered(item, markerOptions);
        }



        @Override
        protected void onBeforeClusterRendered(Cluster<MyItem> cluster, MarkerOptions markerOptions) {
            super.onBeforeClusterRendered(cluster, markerOptions);
        }

    }