Android recyclerview horizontal list tutorial

public class Grocery {
    public int productImage;
    public String productName;

    public Grocery(String productName, int productImage) {
        this.productImage = productImage;
        this.productName = productName;
    }

    public int getProductImage() {
        return productImage;
    }

    public void setProductImage(int productImage) {
        this.productImage = productImage;
    }

    public String getProductName() {
        return productName;
    }

    public void setProductName(String productName) {
        this.productName = productName;
    }
}

//

public class MainActivity extends AppCompatActivity {

    private List<Grocery> groceryList = new ArrayList<>();
    private RecyclerView groceryRecyclerView;
    private RecyclerViewHorizontalListAdapter groceryAdapter;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        groceryRecyclerView = (RecyclerView) findViewById(R.id.idRecyclerViewHorizontalList);
        // add a divider after each item for more clarity        groceryRecyclerView.addItemDecoration(new DividerItemDecoration(MainActivity.this, LinearLayoutManager.HORIZONTAL));
        groceryAdapter = new RecyclerViewHorizontalListAdapter(groceryList, getApplicationContext());
        LinearLayoutManager horizontalLayoutManager = new LinearLayoutManager(MainActivity.this, LinearLayoutManager.HORIZONTAL, false);
        groceryRecyclerView.setLayoutManager(horizontalLayoutManager);
        groceryRecyclerView.setAdapter(groceryAdapter);
        populategroceryList();

    }

    private void populategroceryList(){
        Grocery potato = new Grocery("Potato", R.drawable.potato);
        Grocery onion = new Grocery("Onion", R.drawable.potato);
        Grocery cabbage = new Grocery("Cabbage", R.drawable.potato);
        Grocery cauliflower = new Grocery("Cauliflower", R.drawable.potato);
        groceryList.add(potato);
        groceryList.add(onion);
        groceryList.add(cabbage);
        groceryList.add(cauliflower);
        groceryAdapter.notifyDataSetChanged();
    }

}

///
public class RecyclerViewHorizontalListAdapter extends RecyclerView.Adapter<RecyclerViewHorizontalListAdapter.GroceryViewHolder>{
    private List<Grocery> horizontalGrocderyList;
    Context context;

    public RecyclerViewHorizontalListAdapter(List<Grocery> horizontalGrocderyList, Context context){
        this.horizontalGrocderyList= horizontalGrocderyList;
        this.context = context;
    }

    @Override    public GroceryViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        //inflate the layout file        View groceryProductView = LayoutInflater.from(parent.getContext()).inflate(R.layout.horizontal_list_grocery_item, parent, false);
        GroceryViewHolder gvh = new GroceryViewHolder(groceryProductView);
        return gvh;
    }

    @Override    public void onBindViewHolder(GroceryViewHolder holder, final int position) {
        holder.imageView.setImageResource(horizontalGrocderyList.get(position).getProductImage());
        holder.txtview.setText(horizontalGrocderyList.get(position).getProductName());
        holder.imageView.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View v) {
                //On click goes here                String productName = horizontalGrocderyList.get(position).getProductName().toString();
                Toast.makeText(context, productName + " is selected", Toast.LENGTH_SHORT).show();
            }
        });
    }

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

    public class GroceryViewHolder extends RecyclerView.ViewHolder {
        ImageView imageView;
        TextView txtview;
        public GroceryViewHolder(View view) {
            super(view);
            imageView=view.findViewById(R.id.idProductImage);
            txtview=view.findViewById(R.id.idProductName);
        }
    }
}


//layout
//activity_main.xml


<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="np.com.sitalmandal.horzontiallayout.MainActivity">

    <LinearLayout        android:layout_width="match_parent"        android:layout_height="75dp"        android:layout_alignParentStart="true"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true"        android:layout_marginStart="0dp"        android:layout_marginLeft="0dp"        android:layout_marginTop="166dp">

        <android.support.v7.widget.RecyclerView            android:id="@+id/idRecyclerViewHorizontalList"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:clipChildren="true"            android:clipToPadding="true"            android:scrollbars="horizontal" />

    </LinearLayout>

</RelativeLayout>




// horizontal_list_grocery_item.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="horizontal"    android:layout_width="wrap_content"    android:layout_height="wrap_content">
    <ImageView        android:id="@+id/idProductImage"        android:layout_width="50dp"        android:layout_height="50dp"/>
    <TextView        android:id="@+id/idProductName"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textSize="24sp"/>
</LinearLayout>



//compile 'com.android.support:recyclerview-v7:+'

https://iteritory.com/android-recyclerview-horizontal-list-tutorial/