public Observable<Stringer> getStringer(final String id) {
   return stringerService
       .getStringer(id)
       .map(
           new Func1<RequestResult, Stringer>() {
             @Override
             public Stringer call(RequestResult requestResult) {
               return requestResult.results;
             }
           });
 }
 public Observable<EmptyRequestResponse> setCurrentLocation(
     String id, float currentLong, float currentLat) {
   return stringerService.setCurrentLocation(
       new Object(), id, Float.toString(currentLong), Float.toString(currentLat));
 }
 public Observable<EmptyRequestResponse> setAvailability(String id, boolean available) {
   return stringerService.setAvailability(new Object(), id, Boolean.toString(available));
 }
 public Observable<List<Stringer>> getClosestStringers(float longtitude, float latitude) {
   return stringerService.getClosestStringers(longtitude, latitude);
 }