Add Filter in SearchView with Room and RecyleView

Question

(google translate)

Intro: I have searched for this solution, but did not find it. If there is a duplicate of this problem, please let me know. thanks.

Problem: I created a storage application with the Room database and RecycleView. Then I looked for ways to add Search to my data. Everything went smoothly, but there was one problem. If the search word is reduced, then the search is limited to visible data. (Look at the screenshot)

1. Normal
2. Search is done (Normal)
3. Empty word
4. Search again and The result
5. GIF Image

I hope you understand. Please help me. I have seen a lot of tutorials but nothing works.

thank you

My Code: Filter in my Adapter

public Filter getFilter() {
        return new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence charSequence) {
                String charString = charSequence.toString();
                List<Barang> filteredList = new ArrayList<>();
                if (charString.isEmpty()) {
                    filteredList.addAll(namaBarang);
                } else {
                    for (Barang row : namaBarang) {

                        // name match condition. this might differ depending on your requirement
                        // here we are looking for name or phone number match
                        if (row.getNamaBarang().toLowerCase().contains(charString.toLowerCase())) {
                            filteredList.add(row);
                        }
                    }

                }

                FilterResults filterResults = new FilterResults();
                filterResults.values = filteredList;
                return filterResults;
            }

            @Override
            protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
                namaBarang = (ArrayList<Barang>) filterResults.values;
                notifyDataSetChanged();
            }
        };
    }

MainActivity

   @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        final MenuItem searchItem = menu.findItem(R.id.action_search);
        final SearchView searchView = (SearchView) searchItem.getActionView();
        searchView.setOnQueryTextListener(this);
        return true;
    }

        @Override
        public boolean onQueryTextSubmit(String query) {
            adapter.getFilter().filter(query);
            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
         //   t = newText.;

            adapter.getFilter().filter(newText);
            return false;
        }

And I have this too in my Adapter:

void setBarangs(List<Barang> barangs){
    namaBarang = barangs;
    notifyDataSetChanged();
}

Answer 1

My problem has been solved with this:

@Override
public Filter getFilter() {
    return new Filter() {
        @Override
        protected FilterResults performFiltering(CharSequence charSequence) {
            String charString = charSequence.toString();
            List<Barang> listHasilFilter = new ArrayList<>();
            List<Barang> listYgAkandiFilter = new ArrayList<>();
            listYgAkandiFilter.addAll(namaBarangC);
            if (charString.isEmpty()) {
                listHasilFilter = listYgAkandiFilter;

            //    namaBarang = listYgAkandiFilter;
                Log.d(TAG, "" + namaBarang.size());
            } else {
                for (Barang row : namaBarangC) {

                    // name match condition. this might differ depending on your requirement
                    // here we are looking for name or phone number match
                    if (row.getNamaBarang().toLowerCase().contains(charString.toLowerCase())) {
                        listHasilFilter.add(row);
                    }
                }

            }

            FilterResults hasilFilter = new FilterResults();
            hasilFilter.values = listHasilFilter;
            return hasilFilter;
        }

        @Override
        protected void publishResults(CharSequence charSequence, FilterResults hasilFilter) {
            namaBarang = (ArrayList<Barang>) hasilFilter.values;
            notifyDataSetChanged();
        }
    };
}

Thanks