Toolbar with SearchView temporary filtering RecyclerView

Question

I need to implement search functionality inside my android app which uses toolbar, SlidingTabLayout and ViewPager that holds fragments. Inside each fragment there is a RecyclerView with list of items.

RecyclerView data is static defined in separate class (DataAccess.java) and those lists are updated and RecyclerView gets refreshed just by calling (without passing new data)

mRecyclerView.getAdapter().notifyDataSetChanged();

Is there any simple way to temporary filter RecyclerView without changing the data and after the user presses return button inside Toolbar to remove the filter and show inital list.

Before pressing Search icon inside toolbar menu:

So when the user is typing "Josip..." the filter will be active

and after he presses the X button in SearchView the user will get the same data as before without filter.

@Override 
public boolean onQueryTextChange(String newText) {
    // filter data (temporary remove all items from DataAccess.list that don't .startsWith(newText)
}

@Override 
public boolean onQueryTextSubmit(String query)
    // Doesn't help if I revert deleted items here
}

Answer 1

@Override 
public boolean onQueryTextSubmit(String query){
    ((ItemAdapter) myRecList.getAdapter()).setFilter(query)
}

---

public class ItemAdapter extends RecyclerView.Adapter<ItemAdapter.ViewHolder> {

    private List<String> visibleObjects;
    private List<String> allObjects;

    .....

    public void flushFilter(){
        visibleObjects=new ArrayList<>();
        visibleObjects.addAll(allObjects);
        notifyDataSetChanged();
    }

    public void setFilter(String queryText) {

        visibleObjects = new ArrayList<>();
        constraint = constraint.toString().toLowerCase();
        for (String item: allObjects) {            
                if (item.toLowerCase().contains(queryText))                     
                    visibleObjects.add(item);            
        }
       notifyDataSetChanged();
    }
}