Filtering RecycerView using SearchView in android [duplicate]

Question

I'm trying to make an app that filters book titles. The filtering part works perfectly fine but the problem is when you start the app. I want to show all the titles in a recyclerView before filtering.

Adapter

public void filterList(List<Model> filterllist) {
    tileListData = filterllist;
    notifyDataSetChanged();
}

Main.java

searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
            filter(newText);
            return false;
        }
    });



private void filter(String text) {
    List<Model> filteredlist = new ArrayList<>();

    for (Model item : arrayList) {
        if (item.getTittle().toLowerCase().contains(text.toLowerCase())) {
            filteredlist.add(item);
        }
    }
    if (filteredlist.isEmpty()) {
        Toast.makeText(this, "No Data Found..", Toast.LENGTH_SHORT).show();
    } else {
        adapter.filterList(filteredlist);
    }
}

I have no clue how to fix this one. Please help out. I'm kind of new to the android platform. Thank you.