private LatLng calculateClusterPosition() {
LatLngBounds.Builder builder = LatLngBounds.builder();
for (DelegatingMarker m : markers) {
builder.include(m.getPosition());
}
return builder.build().getCenter();
}
void refresh() {
int count = markers.size();
if (count == 0) {
removeVirtual();
} else if (count < strategy.getMinMarkersCount()) {
removeVirtual();
for (DelegatingMarker m : markers) {
m.changeVisible(true);
}
} else {
for (DelegatingMarker m : markers) {
m.changeVisible(false);
}
LatLng position = calculateClusterPosition();
if (virtual == null || lastCount != count) {
removeVirtual();
lastCount = count;
virtual = strategy.createMarker(new ArrayList<Marker>(markers), position);
} else {
virtual.setPosition(position);
}
}
}
