List<Object> params = new ArrayList<Object>();
params.add(subject);
String filter = has ? "hasSubjects == param" : "needSubjects == param";
GeocellQuery baseQuery = new GeocellQuery(filter, "String param",
params);
try {
results = MyGeocellManager.proximityFetch(center, 30,
l.getActiveRadius() * 1000, Participant.class, baseQuery,