Swipe to Delete and Undo in Android RecyclerView

public class RecyclerData {
    // string for displaying 
    // title and description.
    private String title;
    private String description;

    // constructor for our title and description.
    public RecyclerData(String title, String description) {
        this.title = title;
        this.description = description;
    }

    // creating getter and setter methods.
    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }   
}

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

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

import java.util.ArrayList;

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.RecyclerViewHolder> {

    // creating a variable for our array list and context.
    private ArrayList<RecyclerData> courseDataArrayList;
    private Context mcontext;

    // creating a constructor class.
    public RecyclerViewAdapter(ArrayList<RecyclerData> recyclerDataArrayList, Context mcontext) {
        this.courseDataArrayList = recyclerDataArrayList;
        this.mcontext = mcontext;
    }

    @NonNull
    @Override
    public RecyclerViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        // Inflate Layout
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_layout, parent, false);
        return new RecyclerViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerViewHolder holder, int position) {
        // Set the data to textview from our modal class.
        RecyclerData recyclerData = courseDataArrayList.get(position);
        holder.courseNameTV.setText(recyclerData.getTitle());
        holder.courseDescTV.setText(recyclerData.getDescription());
    }

    @Override
    public int getItemCount() {
        // this method returns 
          // the size of recyclerview
        return courseDataArrayList.size();
    }

    // View Holder Class to handle Recycler View.
    public class RecyclerViewHolder extends RecyclerView.ViewHolder {
      
        // creating a variable for our text view.
        private TextView courseNameTV;
        private TextView courseDescTV;

        public RecyclerViewHolder(@NonNull View itemView) {
            super(itemView);
            // initializing our text views.
            courseNameTV = itemView.findViewById(R.id.idTVCourseName);
            courseDescTV = itemView.findViewById(R.id.idTVCourseDesc);
        }
    }
}

import android.os.Bundle;
import android.view.View;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.ItemTouchHelper;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

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

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    
    // creating a variable for recycler view, 
    // array list and adapter class.
    private RecyclerView courseRV;
    private ArrayList<RecyclerData> recyclerDataArrayList;
    private RecyclerViewAdapter recyclerViewAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        // initializing our variables.
        courseRV = findViewById(R.id.idRVCourse);
        
        // creating new array list.
        recyclerDataArrayList = new ArrayList<>();
        
        // in below line we are adding data to our array list.
        recyclerDataArrayList.add(new RecyclerData("DSA Course", "DSA Self Paced Course"));
        recyclerDataArrayList.add(new RecyclerData("C++ Course", "C++ Self Paced Course"));
        recyclerDataArrayList.add(new RecyclerData("Java Course", "Java Self Paced Course"));
        recyclerDataArrayList.add(new RecyclerData("Python Course", "Python Self Paced Course"));
        recyclerDataArrayList.add(new RecyclerData("Fork CPP", "Fork CPP Self Paced Course"));
        recyclerDataArrayList.add(new RecyclerData("Amazon SDE", "Amazon SDE Test Questions"));
       
        // initializing our adapter class with our array list and context.
        recyclerViewAdapter = new RecyclerViewAdapter(recyclerDataArrayList, this);
       
        // below line is to set layout manager for our recycler view.
        LinearLayoutManager manager = new LinearLayoutManager(this);
        
        // setting layout manager for our recycler view.
        courseRV.setLayoutManager(manager);
        
        // below line is to set adapter 
        // to our recycler view.
        courseRV.setAdapter(recyclerViewAdapter);
        
        // on below line we are creating a method to create item touch helper
        // method for adding swipe to delete functionality.
        // in this we are specifying drag direction and position to right
        new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.RIGHT) {
            @Override
            public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
                // this method is called 
                // when the item is moved.
                return false;
            }

            @Override
            public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
                // this method is called when we swipe our item to right direction.
                // on below line we are getting the item at a particular position.
                RecyclerData deletedCourse = recyclerDataArrayList.get(viewHolder.getAdapterPosition());
                
                // below line is to get the position
                // of the item at that position.
                int position = viewHolder.getAdapterPosition();
                
                // this method is called when item is swiped.
                // below line is to remove item from our array list.
                recyclerDataArrayList.remove(viewHolder.getAdapterPosition());
                
                // below line is to notify our item is removed from adapter.
                recyclerViewAdapter.notifyItemRemoved(viewHolder.getAdapterPosition());
                
                // below line is to display our snackbar with action.
                Snackbar.make(courseRV, deletedCourse.getTitle(), Snackbar.LENGTH_LONG).setAction("Undo", new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        // adding on click listener to our action of snack bar.
                        // below line is to add our item to array list with a position.
                        recyclerDataArrayList.add(position, deletedCourse);
                        
                        // below line is to notify item is 
                        // added to our adapter class.
                        recyclerViewAdapter.notifyItemInserted(position);
                    }
                }).show();
            }
            // at last we are adding this 
            // to our recycler view.
        }).attachToRecyclerView(courseRV);
    }
}