Sabrina/recycler view adapter

java/app/src/main/java/com/fullstorydev/shoppedemo/adapters/MarketProductAdapter.java

@@ -0,0 +1,82 @@
+package com.fullstorydev.shoppedemo.adapters;
+
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import androidx.annotation.NonNull;
+import androidx.databinding.DataBindingUtil;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.fullstorydev.shoppedemo.ui.market.MarketEventHandlers;
+import com.fullstorydev.shoppedemo.R;
+import com.fullstorydev.shoppedemo.data.Product;
+import com.fullstorydev.shoppedemo.databinding.ListItemMarketBinding;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class MarketProductAdapter extends RecyclerView.Adapter<MarketProductAdapter.MarketProductViewHolder> {
+    private List<Product> mProductList;
+    private LayoutInflater layoutInflater;
+    private MarketEventHandlers mMarketHandlers;
+
+    public MarketProductAdapter(MarketEventHandlers marketHandlers) {
+        mMarketHandlers = marketHandlers;
+        mProductList = new ArrayList<>();
+    }
+
+    @NonNull
+    @Override
+    public MarketProductViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        if (layoutInflater == null) {
+            layoutInflater = LayoutInflater.from(parent.getContext());
+        }
+        // binding class automatically generated by Data Binding Library from list_item_market
+        ListItemMarketBinding binding = DataBindingUtil.inflate(layoutInflater, R.layout.list_item_market, parent, false);
+        return new MarketProductViewHolder(binding);
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull MarketProductViewHolder holder, int position) {
+        holder.bind(mProductList.get(position));
+    }
+
+    @Override
+    public int getItemCount() {
+        if(mProductList==null) return 0;
+        return mProductList.size();
+    }
+
+    public void setProductList(List<Product> products){
+        //TODO: check diff and use callback & DiffUtil.DiffResult to avoid recreating every view
+        mProductList = products;
+        notifyDataSetChanged();
+    }
+
+    class MarketProductViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
+        private ListItemMarketBinding binding;
+        MarketProductViewHolder(@NonNull ListItemMarketBinding binding){
+            super(binding.getRoot());
+            this.binding = binding;
+            // bind the on click handler for add to cart buttons
+            this.binding.setHandlers(mMarketHandlers);
+        }
+
+        void bind(Product product) {
+            binding.setProduct(product);
+            binding.executePendingBindings();
+        }
+
+        @Override
+        public void onClick(View v) {
+            // getting clicked product from adapter position
+            Product product = mProductList.get(getAdapterPosition());
+            try {
+                //TODO: When recyclerview is clicked, get the product and perform action here, i.e. show product details fragment
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+        }
+    }
+}

java/app/src/main/java/com/fullstorydev/shoppedemo/ui/market/MarketEventHandlers.java

@@ -0,0 +1,8 @@
+package com.fullstorydev.shoppedemo.ui.market;
+
+import com.fullstorydev.shoppedemo.data.Product;
+
+// interface for all action handlers for the market fragment
+public interface MarketEventHandlers {
+    void onClickAddToCart(Product product);
+}

java/app/src/main/java/com/fullstorydev/shoppedemo/ui/market/MarketFragment.java

@@ -9,21 +9,28 @@
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.Observer;
 import androidx.lifecycle.ViewModelProvider;
+import androidx.recyclerview.widget.RecyclerView;
 
 import com.fullstorydev.shoppedemo.R;
+import com.fullstorydev.shoppedemo.adapters.MarketProductAdapter;
 import com.fullstorydev.shoppedemo.data.Product;
 
 import java.util.List;
 
-public class MarketFragment extends Fragment {
+public class MarketFragment extends Fragment implements MarketEventHandlers {
 
     private MarketViewModel marketViewModel;
+    private MarketProductAdapter mMarketProductAdapter;
 
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater,
                              ViewGroup container, Bundle savedInstanceState) {
         View root = inflater.inflate(R.layout.fragment_market, container, false);
 
+        mMarketProductAdapter = new MarketProductAdapter(this);
+        RecyclerView mRecyclerView = root.findViewById(R.id.rv_product);
+        mRecyclerView.setAdapter(mMarketProductAdapter);
+
         return root;
     }
 
@@ -32,12 +39,15 @@ public void onActivityCreated(@Nullable Bundle savedInstanceState) {
         super.onActivityCreated(savedInstanceState);
 
         marketViewModel = new ViewModelProvider(this).get(MarketViewModel.class);
-
         marketViewModel.getProductList().observe(this.getViewLifecycleOwner(), new Observer<List<Product>>() {
             @Override
             public void onChanged(List<Product> products) {
-                // products holds the list of products, live data is updated when retrieved from API, this data will be used to populate the recycler view
+                mMarketProductAdapter.setProductList(products);
             }
         });
     }
+
+    public void onClickAddToCart(Product product){
+        marketViewModel.increaseQuantityInCart(product);
+    }
 }

java/app/src/main/java/com/fullstorydev/shoppedemo/ui/market/MarketViewModel.java

@@ -14,15 +14,17 @@ public class MarketViewModel extends AndroidViewModel {
     private ProductRepository mRepository;
     private LiveData<List<Product>> mProductList;
 
-
     public MarketViewModel(Application application) {
         super(application);
-
         mRepository = new ProductRepository(application);
         mProductList = mRepository.getAllFromAPI();
     }
 
     public LiveData<List<Product>> getProductList() {
         return mProductList;
     }
+
+    public void increaseQuantityInCart(Product product){
+        mRepository.increaseQuantityInCart(product);
+    }
 }

java/app/src/main/res/layout/fragment_market.xml

@@ -1,11 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:orientation="vertical"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
     <androidx.recyclerview.widget.RecyclerView
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:id="@+id/rv_product" />
+        android:id="@+id/rv_product"
+        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager" />
 </LinearLayout>

java/app/src/main/res/layout/list_item_market.xml

@@ -6,6 +6,9 @@
         <variable
             name="product"
             type="com.fullstorydev.shoppedemo.data.Product" />
+        <variable
+            name="handlers"
+            type="com.fullstorydev.shoppedemo.ui.market.MarketEventHandlers"/>
     </data>
 
     <LinearLayout
@@ -43,6 +46,7 @@
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:id="@+id/btn_add_to_cart"
+                android:onClick="@{()->handlers.onClickAddToCart(product)}"
                 android:text="@string/add_to_cart">
             </Button>
         </LinearLayout>