Recycler view in Android With Java

activity_main.xml

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <androidx.recyclerview.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/rec"/>
</LinearLayout>

MainActivity.Java

package com.androinidan.recy;

import android.os.Bundle;

import com.google.android.material.snackbar.Snackbar;

import androidx.appcompat.app.AppCompatActivity;

import android.view.View;

import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.androinidan.recy.databinding.ActivityMainBinding;

import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;

public class MainActivity extends AppCompatActivity {

    String Course[]={"Android","2","PHP","Android","Java","PHP","Android","Java","PHP","Android","Java","PHP","Android","Java","PHP","Android","Java","PHP",
            "Android","Java","PHP","Android","Java","PHP","Android","Java","PHP","Android","Java","PHP","Android","Java","PHP","Android","Java","PHP",
            "Android","Java","PHP","Android","Java","PHP","Android","Java","PHP"};

    RecyclerView recyclerView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        recyclerView = (RecyclerView)findViewById(R.id.rec);

        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getApplicationContext());
        linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL); // set Horizontal Orientation
        recyclerView.setLayoutManager(linearLayoutManager);
        CustomAdapter customAdapter = new CustomAdapter(MainActivity.this, Course);
        recyclerView.setAdapter(customAdapter);


    }
}

CustomAdapter.Java

package com.androinidan.recy;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.MyViewHolder>{
    String Names[] ;
    Context context;
    public CustomAdapter(MainActivity mainActivity, String[] course) {
        this.context = mainActivity;
        this.Names = course;
    }

    @NonNull
    @Override
    public CustomAdapter.MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.rowlayout, parent, false);

        MyViewHolder vh = new MyViewHolder(v); // pass the view to View Holder
        return vh;

    }

    @Override
    public void onBindViewHolder(@NonNull CustomAdapter.MyViewHolder holder, int position) {
        holder.name.setText(Names[holder.getAdapterPosition()]);

        holder.name.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Toast.makeText(context, Names[holder.getAdapterPosition()], Toast.LENGTH_SHORT).show();
            }
        });

    }

    @Override
    public int getItemCount() {
        return Names.length;
    }

    public class MyViewHolder extends  RecyclerView.ViewHolder {
        TextView name;// init the item view's
        public MyViewHolder(View itemView) {
            super(itemView);
            // get the reference of item view's
            name = (TextView) itemView.findViewById(R.id.name);
        }
    }
}

rowlayout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:background="#fff">
    <!--
    items for a single row of RecyclerView
    -->
    <TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:textColor="#FF5722"
        android:textSize="20sp" />
</LinearLayout>