Custom search through ArrayList for array names

I'm trying to implement search filter with getFilter method in my custom adapter.

There are two models of search through the list.

• search for title of an item,
• search for genre[] of an item.

(But I'm just talking about genre here).

The below code is working fine, but what I need is just a little more customized way to search in genre[].

What I'm trying to achieve is: (What I want):

multi-keyword searching, each category separated with,. example: genre1,genre2

(What I have done):

When I type genre1,genre2 then it gives the items that have this sequence in genres, it won't give genre1,genre3,genre2 , or just genre1.

Can you help, please?

getFilter:

@Override
public Filter getFilter() {
    Filter filter = new Filter() {
        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            dataList = (List<ProductLocal>) results.values;
            notifyDataSetChanged();
        }
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults results = new FilterResults();
            List<ProductLocal> filteredList = new ArrayList<>();
            constraint = constraint.toString().toLowerCase();
            for (int i = 0; i < dataListFilter.size(); i++) {
                ProductLocal dataNames = dataListFilter.get(i);

                String genreStr = "";
                for (String str : dataNames.getGenre()) {
                    genreStr += str + ",";
                }

                if (dataNames.getTitle().toLowerCase().startsWith(constraint.toString()) 
                 || genreStr.toLowerCase().contains(constraint.toString())) {
                    filteredList.add(dataNames);
                }
            }
            results.count = filteredList.size();
            results.values = filteredList;
            return results;
        }

    };
    return filter;
}