@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_item_list);


    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    if (toolbar != null) {
        toolbar.setTitle(getTitle());
    }
    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    if (fab != null) {
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(getApplicationContext(), ItemDetailDataEntry.class);
                startActivity(intent);

            }
        });
    }
}

@Override
protected void onStart() {
    super.onStart();
    View recyclerView = findViewById(R.id.item_list);
    assert recyclerView != null;
    setupRecyclerView((RecyclerView) recyclerView);

}

private void setupRecyclerView(@NonNull RecyclerView recyclerView) {
    recyclerView.setLayoutManager(new LinearLayoutManager(this));

    RealmConfiguration realmConfig = new RealmConfiguration.Builder(this).build();
    Realm.setDefaultConfiguration(realmConfig);
    Realm realm = Realm.getDefaultInstance();
    realm.beginTransaction();
    final RealmResults<Item> items = realm.where(Item.class).findAll();
    realm.commitTransaction();
    int size = items.size();
    Log.e(LOG_TAG, "size " + size);
    if (size > 0) {
        recyclerView.setAdapter(new ItemListAdapter(this, realm.where(Item.class).findAllAsync()));
        recyclerView.setHasFixedSize(true);
    }

}