searchfragment.java

@Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.search_menu, menu); // diambil dari search_menu.xml
        MenuItem searchItem = menu.findItem(R.id.action_search); // id dari search_menu.xml
        SearchView searchView = (SearchView) searchItem.getActionView(); // object "actionViewClass" yang diambil dari search_menu.xml
        //searchView.setOnQueryTextListener(this);
        searchView.setQueryHint("Cari Apotek");

        //penambahan fungsi pencarian

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

            @Override
            public boolean onQueryTextChange(String newText) { // pemanggilan bertipe string pada search yang akan di cari

                List<Jarak> result = new ArrayList<>();
                for (Jarak x: itemList){
                    if (x.getNama().contains(newText))
                        result.add(x);
                }

                ((CustomListAdapter)list.getAdapter()).update(result); //to refresh listview

                return false;
            }
        });
        //end

        super.onCreateOptionsMenu(menu, inflater);

    }

CustomListAdapter.java
//penambahan
public CustomListAdapter(Context context, List<Jarak> jarakItems) {
        this.context = context;
        this.jarakItems = jarakItems;

    }