gistfile1.txt

// Adapter Class

package ke.co.appslab.letafood.adapters;

import android.content.Context;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.bumptech.glide.request.RequestOptions;

import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;
import ke.co.appslab.letafood.R;
import ke.co.appslab.letafood.callbacks.FoodCartListener;
import ke.co.appslab.letafood.models.Menu;
import ke.co.appslab.letafood.utils.Utils;

import static ke.co.appslab.letafood.api.ApiEndpoints.IMAGE_URL;

public class RestaurantMenuAdapter extends RecyclerView.Adapter<RestaurantMenuAdapter.MyViewHolder>{
    private List<Menu> foodModelList;
    private Context context;
    private FoodCartListener listener;
    private static int totalCartItems = 0;


    public RestaurantMenuAdapter(List<Menu> foodModelList, Context context, FoodCartListener listener) {
        this.foodModelList = foodModelList;
        this.context = context;
        this.listener = listener;
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {

        @BindView(R.id.image)
        ImageView foodMenuImg;
        @BindView(R.id.name)
        TextView foodMenuTitleText;
        @BindView(R.id.price)
        TextView foodMenuPriceText;
        @BindView(R.id.description)
        TextView foodMenuDescText;

        @BindView(R.id.add_cart)
        ImageButton addCart;

        @BindView(R.id.remove_cart)
        ImageButton removeCart;
        @BindView(R.id.number_in_cart)
        TextView numberInCart;



        public MyViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);

            addCart.setOnClickListener(v -> {
                listener.onAdd(getAdapterPosition());
            });



            removeCart.setOnClickListener(v -> listener.remove(getAdapterPosition()));
            itemView.setOnClickListener(v -> listener.onMenuClicked(getAdapterPosition()));
        }
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.food_menu_details_2, parent, false);
        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        Menu foodItem = foodModelList.get(position);

        Glide.with(context).load(IMAGE_URL + foodItem.getPhoto()).apply(new RequestOptions().placeholder(R.drawable.food)).into(holder.foodMenuImg);
        holder.foodMenuTitleText.setText(foodItem.getName());
        holder.foodMenuPriceText.setText(Utils.formatNumber(foodItem.getPrice()));
        holder.foodMenuDescText.setText(foodItem.getDescription());

        holder.numberInCart.setText(String.valueOf(foodItem.getNumberInCart()));

    }

    @Override
    public int getItemCount() {
        return foodModelList.size();
    }

}

// Fragment Class


package ke.co.appslab.letafood.views.fragments;

import android.app.AlertDialog;
import androidx.lifecycle.ViewModelProviders;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.coordinatorlayout.widget.CoordinatorLayout;
import com.google.android.material.snackbar.Snackbar;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentTransaction;
import androidx.recyclerview.widget.DefaultItemAnimator;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import java.util.ArrayList;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.Unbinder;
import ke.co.appslab.letafood.R;
import ke.co.appslab.letafood.adapters.RestaurantMenuAdapter;
import ke.co.appslab.letafood.callbacks.FoodCartListener;
import ke.co.appslab.letafood.models.CartModel;
import ke.co.appslab.letafood.models.Menu;
import ke.co.appslab.letafood.ui.ConnectionReceiver;
import ke.co.appslab.letafood.utils.LetaFood;
import ke.co.appslab.letafood.utils.Utils;
import ke.co.appslab.letafood.viewmodels.CartViewModel;

import static ke.co.appslab.letafood.api.ApiEndpoints.IMAGE_URL;

public class HotelMenuFragment extends Fragment implements FoodCartListener, ConnectionReceiver.ConnectionReceiverListener {
    static RecyclerView.LayoutManager mLayoutManager;
    @BindView(R.id.restaurantMenuRv)
    RecyclerView restaurantMenuRv;
    RestaurantMenuAdapter restaurantMenuAdapter;
    Unbinder unbinder;
    String restName, restSlogan, image;
    int hotelId, restRating;
    List<Menu> allMenus;
    private CartViewModel cartViewModel;
    List<CartModel> cartModelList = new ArrayList<>();

    @BindView(R.id.container)
    CoordinatorLayout coordinatorLayout;


    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_hotel_menu, container, false);
        unbinder = ButterKnife.bind(this, view);

        if(!checkConnection()){
            noInternetSnackBar();
        }

        cartViewModel = ViewModelProviders.of(this).get(CartViewModel.class);

        Bundle bundle = this.getArguments();

        if (bundle != null) {
            String list = bundle.getString("menu_list");
            restName = bundle.getString("restName");
            restSlogan = bundle.getString("restSlogan");
            image = bundle.getString("restImage");
            hotelId = bundle.getInt("hotelId");
            restRating = bundle.getInt("restRating");


            Gson gson = new Gson();
            allMenus = gson.fromJson(list, new TypeToken<ArrayList<Menu>>() {
            }.getType());
            initView();

        }
        cartViewModel.getListLiveData().observe(this, cartModelList1 -> cartModelList = cartModelList1);


        return view;
    }


    public void initView() {
        List<Menu> transfomer = cartViewModel.cartTransfomer(allMenus);
        if(!transfomer.isEmpty()){
            allMenus.clear();
            allMenus.addAll(transfomer);
        }
        restaurantMenuAdapter = new RestaurantMenuAdapter(allMenus, getActivity(), this);
        mLayoutManager = new LinearLayoutManager(getActivity());
        restaurantMenuRv.setLayoutManager(mLayoutManager);
        restaurantMenuRv.setItemAnimator(new DefaultItemAnimator());
        restaurantMenuRv.setAdapter(restaurantMenuAdapter);
        restaurantMenuRv.setNestedScrollingEnabled(true);
    }
    @Override
    public void onAdd(int position) {
        Menu menu = allMenus.get(position);
        //if menu exists in cart, update number in cart else add new CartViewModel to cart
        CartModel cartModel=new CartModel();
        cartModel.setCartNoOfItems(menu.getNumberInCart()+1);
        cartModel.setMenuId(menu.getId());
        cartModel.setCartFoodPrice(Integer.parseInt(menu.getPrice()));
        cartModel.setRestaurantId(Integer.parseInt(menu.getHotelId()));
        cartModel.setCartFoodTitle(menu.getName());
        cartModel.setFoodImage(menu.getPhoto());
        cartModel.setRestaurantName(restName);
        cartViewModel.addItemsToCart(cartModel);
        numberInCart(menu.getId(),position);
    }

    @Override
    public void remove(int position) {
        Menu menu = allMenus.get(position);
        //check if exist in cart
        //remove
        cartViewModel.delete(menu.getId());
        numberInCart(menu.getId(),position);
    }

    @Override
    public void onMenuClicked(int position) {
        showMenuDetails(position);
    }

    private void showMenuDetails(int position) {
        Menu menu = allMenus.get(position);
        AlertDialog.Builder builder=new AlertDialog.Builder(getContext());
        View view=getLayoutInflater().inflate(R.layout.product_details,null,false);
        ImageView imageView=view.findViewById(R.id.image);
        TextView name=view.findViewById(R.id.name);
        TextView description=view.findViewById(R.id.description);

        Glide.with(getContext()).load(IMAGE_URL + menu.getPhoto()).into(imageView);
        name.setText(menu.getName());
        description.setText(menu.getDescription());
        TextView numInCart=view.findViewById(R.id.number_in_cart);
        numInCart.setText(""+menu.getNumberInCart());
        ImageButton addCart=view.findViewById(R.id.add_cart);
        addCart.setOnClickListener(v->{
            int num=menu.getNumberInCart();
            num+=1;
            menu.setNumberInCart(num);
            onAdd(position);
            numInCart.setText(""+menu.getNumberInCart());
        });
        ImageButton removeCart=view.findViewById(R.id.remove_cart);
        removeCart.setOnClickListener(v->{
            int num=menu.getNumberInCart();
            if(num>0){
                num-=1;
                menu.setNumberInCart(num);
                remove(position);
                numInCart.setText(""+menu.getNumberInCart());
            }

        });
        TextView category=view.findViewById(R.id.category);
        category.setText(menu.getCategory());

        TextView price=view.findViewById(R.id.price);
        price.setText(Utils.formatNumber(menu.getPrice()));

        ImageButton close=view.findViewById(R.id.close_btn);

        builder.setView(view);
        AlertDialog alertDialog = builder.create();
        close.setOnClickListener(v-> alertDialog.dismiss());
        alertDialog.show();
    }

    private void numberInCart(int id, int position) {
        cartViewModel.countInCart(id).observe(this, integer -> {
            //update position in adapter
            allMenus.get(position).setNumberInCart(integer);
            restaurantMenuAdapter.notifyItemChanged(position,allMenus.get(position));
        });
    }
    @Override
    public void onDestroyView() {
        super.onDestroyView();
        unbinder.unbind();
    }

    @Override
    public void onResume() {
        super.onResume();
        LetaFood.getInstance().setConnectionListener(this);
    }

    @Override
    public void onNetworkConnectionChanged(boolean isConnected) {
        if (!isConnected) {
             Snackbar snackbar = Snackbar.make(coordinatorLayout, "You are currently offline", Snackbar.LENGTH_INDEFINITE);

            snackbar.setAction("RETRY", view -> {
                reloadFragment();
            });

            snackbar.show();
        }
    }


    private void noInternetSnackBar() {
        Snackbar snackbar = Snackbar
                .make(coordinatorLayout, "You are currently offline", Snackbar.LENGTH_INDEFINITE)
                .setAction("RETRY", view -> {
                    reloadFragment();
                });

        snackbar.show();
    }

    private boolean checkConnection() {
        return ConnectionReceiver.isConnected();
    }

    private void reloadFragment() {

        Fragment newFragment = new HomeFragment();
        FragmentTransaction ft = null;
        if (getFragmentManager() != null) {
            ft = getFragmentManager().beginTransaction();
        }
        if (ft != null) {
            ft.replace(R.id.content_home, newFragment).commit();
        }
    }
}