public class ProductActivity extends AppCompatActivity {

    public RecyclerView mRecyclerView;
    public ArrayList<Product> products;
    public ProductListAdapter productsAdapter;

    public final Context context = this;

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

        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton addButton = findViewById(R.id.fab);

        DrawerLayout drawer = findViewById(R.id.drawerLayout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, 0, 0);

        drawer.addDrawerListener(toggle);
        toggle.syncState();

        mRecyclerView = findViewById(R.id.productRecyclerView);
        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
        mRecyclerView.setLayoutManager(mLayoutManager);

        products = new ArrayList<>();
        products.add(new Product(0, "Test Nama Produk", "Berikut ini adalah contoh penjelasan nama produk",
                null, 2, 10000));
        products.add(new Product(1, "Test Nama Produk 2", "Berikut ini adalah contoh penjelasan nama produk",
                null, 50, 3000000));


        productsAdapter = new ProductListAdapter(this, products);
        mRecyclerView.setAdapter(productsAdapter);

        if(products.size() == 0){
            Toast.makeText(this, "Produk masih kosong.", Toast.LENGTH_SHORT).show();
        }
    }
}