filter by category

app/src/main/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.example.yourcashiertest">
+
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+
     <uses-feature
         android:name="android.hardware.camera"
         android:required="true" />
@@ -19,23 +21,23 @@
         android:theme="@style/AppTheme2">
         <activity
             android:name=".activities.SkActivity"
-            android:screenOrientation="portrait"/>
+            android:screenOrientation="portrait" />
         <activity
             android:name=".activities.WelcomeActivity"
-            android:screenOrientation="portrait"/>
+            android:screenOrientation="portrait" />
         <activity
             android:name=".activities.ForgetPassword"
-            android:screenOrientation="portrait"/>
+            android:screenOrientation="portrait" />
         <activity
             android:name=".activities.RegisterActivity"
-            android:screenOrientation="portrait"/>
+            android:screenOrientation="portrait" />
         <activity
             android:name=".activities.StatusPayment"
-            android:screenOrientation="portrait"/>
+            android:screenOrientation="portrait" />
         <activity
             android:name=".activities.SplashActivity"
-            android:theme="@style/AppTheme2"
-            android:screenOrientation="portrait">
+            android:screenOrientation="portrait"
+            android:theme="@style/AppTheme2">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
@@ -44,19 +46,20 @@
         </activity>
         <activity
             android:name=".activities.PaymentActivity"
-            android:screenOrientation="portrait"/>
+            android:screenOrientation="portrait" />
         <activity
             android:name=".activities.CartActivity"
-            android:screenOrientation="portrait"/>
+            android:screenOrientation="portrait" />
         <activity
             android:name=".activities.MainActivity"
-            android:screenOrientation="portrait"/>
+            android:screenOrientation="portrait" />
         <activity
             android:name=".activities.ProductActivity"
-            android:screenOrientation="portrait"/>
+            android:screenOrientation="portrait" />
         <activity
             android:name=".activities.LoginActivity"
-            android:screenOrientation="portrait"/>
+            android:screenOrientation="portrait" />
+
         <provider
             android:name="androidx.core.content.FileProvider"
             android:authorities="com.example.yourcashiertest.fileprovider"

app/src/main/java/com/example/yourcashiertest/activities/MainActivity.java

@@ -19,6 +19,7 @@ import android.widget.PopupMenu;
 import android.widget.Toast;
 
 import com.example.yourcashiertest.R;
+import com.example.yourcashiertest.adapters.CategoryAdapter;
 import com.example.yourcashiertest.adapters.ProductAdapter;
 import com.example.yourcashiertest.databinding.ActivityMainBinding;
 import com.example.yourcashiertest.entities.Cart;
@@ -26,6 +27,7 @@ import com.example.yourcashiertest.entities.Product;
 import com.example.yourcashiertest.viewmodels.CartViewModel;
 import com.example.yourcashiertest.viewmodels.ProductViewModel;
 
+import java.util.ArrayList;
 import java.util.List;
 
 
@@ -55,6 +57,7 @@ public class MainActivity extends AppCompatActivity {
 
         prefManager = new PrefManager(this);
         ProductAdapter adapter = new ProductAdapter();
+        CategoryAdapter categoryAdapter = new CategoryAdapter();
         binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
 
         cartViewModel = new ViewModelProvider(this).get(CartViewModel.class);
@@ -109,10 +112,22 @@ public class MainActivity extends AppCompatActivity {
             popupMenu.show();
         });
 
-//        binding.rvCategory.setLayoutManager(new LinearLayoutManager(MainActivity.this, LinearLayoutManager.HORIZONTAL, false));
+        binding.rvCategory.setLayoutManager(new LinearLayoutManager(MainActivity.this,
+                LinearLayoutManager.HORIZONTAL, false));
+        binding.rvCategory.setAdapter(categoryAdapter);
+
         binding.rvProducts.setAdapter(adapter);
         viewModel = new ViewModelProvider(this).get(ProductViewModel.class);
-        viewModel.getProducts().observe(this, adapter::setProducts);
+        viewModel.getProducts().observe(this, products -> {
+            adapter.setProducts(products);
+            List<String> list = new ArrayList<>();
+            for (int i = 0; i < products.size(); i++){
+                list.add(products.get(i).getCategory());
+            }
+            categoryAdapter.setCategories(list);
+        });
+
+        categoryAdapter.setListener(category -> viewModel.filter(category));
 
         adapter.setListener(new ProductAdapter.ProductListener() {
             @Override

app/src/main/java/com/example/yourcashiertest/adapters/CategoryAdapter.java

+package com.example.yourcashiertest.adapters;
+
+import android.view.LayoutInflater;
+import android.view.ViewGroup;
+
+import androidx.annotation.NonNull;
+import androidx.databinding.DataBindingUtil;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.example.yourcashiertest.R;
+import com.example.yourcashiertest.databinding.CategoryItemBinding;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class CategoryAdapter extends RecyclerView.Adapter<CategoryAdapter.ViewHolder> {
+
+    List<String> categories = new ArrayList<>();
+
+    public interface CategoryListener{
+        void onClickItem(String category);
+    }
+
+    private CategoryListener listener;
+    public void setListener(CategoryListener listener){
+        this.listener = listener;
+    }
+
+    public void setCategories(List<String> categories) {
+        this.categories = categories;
+
+        notifyDataSetChanged();
+    }
+
+    @NonNull
+    @Override
+    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        return new CategoryAdapter.ViewHolder(
+                DataBindingUtil.inflate(
+                        LayoutInflater.from(parent.getContext()),
+                        R.layout.category_item,
+                        parent,
+                        false
+                )
+        );
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
+        holder.bindData(categories.get(position), listener);
+    }
+
+    @Override
+    public int getItemCount() {
+        return categories.size();
+    }
+
+    public class ViewHolder extends RecyclerView.ViewHolder {
+
+        CategoryItemBinding binding;
+
+        public ViewHolder(@NonNull CategoryItemBinding binding) {
+            super(binding.getRoot());
+            this.binding = binding;
+        }
+
+        public void bindData(String category, CategoryListener listener){
+            binding.setCategory(category);
+            binding.cvCategory.setOnClickListener(v -> listener.onClickItem(category));
+        }
+    }
+}

app/src/main/java/com/example/yourcashiertest/daos/ProductDao.java

@@ -17,7 +17,7 @@ public interface ProductDao {
     @Query("SELECT * FROM products ORDER BY id DESC")
     public LiveData<List<Product>> getProducts();
 
-    @Query("SELECT * FROM products WHERE name LIKE :query ORDER BY id DESC")
+    @Query("SELECT * FROM products WHERE name LIKE :query OR category LIKE:query ORDER BY id DESC")
     public LiveData<List<Product>> getFilteredProducts(String query);
 
     @Insert(onConflict = OnConflictStrategy.IGNORE)

app/src/main/java/com/example/yourcashiertest/viewmodels/ProductViewModel.java

@@ -19,6 +19,7 @@ public class ProductViewModel extends AndroidViewModel {
 
     private MutableLiveData<String> photo = new MutableLiveData<>("");
     private MutableLiveData<String> query = new MutableLiveData<>("%");
+    private MutableLiveData<String> category = new MutableLiveData<>("%");
     private MutableLiveData<Product> product = new MutableLiveData<>();
     private LiveData<List<Product>> products;
 
@@ -44,7 +45,6 @@ public class ProductViewModel extends AndroidViewModel {
         super(application);
 
         repository = new ProductRepository(application);
-
         products = Transformations.switchMap(query, s -> repository.filteredProducts(s));
     }
 

app/src/main/res/layout/activity_main.xml

@@ -128,22 +128,22 @@
             android:imeOptions="actionSearch"
             android:inputType="textCapWords"
             android:textSize="@dimen/text_default" />
-<!--        <androidx.recyclerview.widget.RecyclerView-->
-<!--            android:id="@+id/rvCategory"-->
-<!--            android:layout_width="match_parent"-->
-<!--            android:layout_height="0dp"-->
-<!--            tools:listitem="@layout/category_item"-->
-<!--            app:layout_constraintStart_toStartOf="parent"-->
-<!--            app:layout_constraintEnd_toEndOf="parent"-->
-<!--            app:layout_constraintTop_toBottomOf="@id/rectangle_4"-->
-<!--            app:layout_constraintBottom_toTopOf="@id/rvProducts"-->
-<!--            />-->
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/rvCategory"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/rectangle_4"
+            app:layout_constraintBottom_toTopOf="@id/rvProducts"
+            />
+
         <androidx.recyclerview.widget.RecyclerView
             android:id="@+id/rvProducts"
             android:layout_width="match_parent"
             android:layout_height="0dp"
             android:layout_marginVertical="15dp"
-            app:layout_constraintTop_toBottomOf="@id/rectangle_4"
+            app:layout_constraintTop_toBottomOf="@id/rvCategory"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintEnd_toEndOf="parent"

app/src/main/res/layout/category_item.xml

@@ -17,7 +17,7 @@
 
         <com.google.android.material.card.MaterialCardView
             android:id="@+id/cvCategory"
-            android:layout_width="match_parent"
+            android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:backgroundTint="@color/colorPrimaryDark"
             android:clickable="true"
@@ -31,17 +31,16 @@
             app:layout_constraintEnd_toEndOf="parent">
 
             <RelativeLayout
-                android:layout_width="match_parent"
+                android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:paddingHorizontal="20dp">
                 <TextView
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
-                    android:text="Example"
+                    android:text="@{category}"
                     android:textStyle="bold"
                     android:textSize="20sp"
                     android:textColor="#fff"
-                    tools:text="elizabeth"
                     android:layout_centerInParent="true"/>
             </RelativeLayout>
         </com.google.android.material.card.MaterialCardView>