I can not use filterParent in my main activity.

[LucasFerrari]

I can not use filterParent in my main activity, I'm new to programming. Sorry, I'm using google translator.

  layoutExpandable.filterParent ("SEARCH PARAM");

I'm using the so in my class:

public class City implements Filterable {

     public String nameCity;

     public City (String cityName) {
         this.nomeCity = nameCity;
     }

     @Override
     public Filter getFilter () {
         return null;
     }
}