How to Build a Simple Swiping Game in Android?

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 android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.Toast;

import org.jetbrains.annotations.NotNull;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;


public class MainActivity extends AppCompatActivity {

    // Creating RecyclerView
    private RecyclerView recyclerView;
    // Creating a ArrayList of type Modelclass
    private List<Modelclass> barsColor;

    // Alert dialog
    AlertDialog.Builder alertDialog;
    private Adapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Adding elements to the barsColor
        barsColor=new ArrayList<>();
        Random random = new Random();
        // Add 15 bars to the RecyclerView
        for(int i=0;i<15;i++)
        {
            // Generate a random number
            int n= random.nextInt(2);
            // Giving the color for the 
            // bar based on the random number
            if(n==0)
            {
                barsColor.add(new Modelclass("Yellow"));
            }
            else
            {
                barsColor.add(new Modelclass("Red"));
            }
        }

        // Finding the RecyclerView by it's ID
        recyclerView = findViewById(R.id.recyclerview);

        // Creating an Adapter Object
        adapter=new Adapter(this,barsColor);

        recyclerView.setAdapter(adapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        // Add ItemTouchHelper to the recyclerView
        ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleCallback);
        itemTouchHelper.attachToRecyclerView(recyclerView);

        adapter.notifyDataSetChanged();

    }

    ItemTouchHelper.SimpleCallback simpleCallback= new ItemTouchHelper.SimpleCallback(0,ItemTouchHelper.LEFT|ItemTouchHelper.RIGHT) {
        @Override
        public boolean onMove(@NonNull @NotNull RecyclerView recyclerView, @NonNull @NotNull RecyclerView.ViewHolder viewHolder, @NonNull @NotNull RecyclerView.ViewHolder target) {
            return false;
        }

        @Override
        public void onSwiped(@NonNull @NotNull RecyclerView.ViewHolder viewHolder, int direction) {
            // get the position of the swiped bar
            int position = viewHolder.getPosition();
            switch (direction) {
                // Right side is for Yellow
                case ItemTouchHelper.LEFT: {
                    if ((barsColor.get(position).getColor()).equals("Red")) {
                        barsColor.remove(position);
                        adapter.notifyDataSetChanged();
                    } else {
                        endthegame();
                        adapter.notifyDataSetChanged();
                        alertDialog.show();
                    }
                    break;
                }
                // Left side is for Red
                case ItemTouchHelper.RIGHT: {
                    if ((barsColor.get(position).getColor()).equals("Yellow")) {
                        barsColor.remove(position);
                        adapter.notifyDataSetChanged();
                    } else {
                        endthegame();
                        adapter.notifyDataSetChanged();
                        alertDialog.show();
                    }
                    break;
                }
            }
        }
    };

    // Shows game ended dialog
    private void endthegame()
    {
        alertDialog=new AlertDialog.Builder(this);
        alertDialog.setMessage("Oopa! Wrong side! Try Again! ").setPositiveButton("Try Again", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(MainActivity.this, "Try again", Toast.LENGTH_SHORT).show();
            }
        }).setNegativeButton("Later", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(MainActivity.this, "Later!", Toast.LENGTH_SHORT).show();
            }
        });
        alertDialog.create();
    }
}

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.ColorSpace;
import android.os.Build;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import androidx.recyclerview.widget.RecyclerView;
import java.util.List;
import org.jetbrains.annotations.NotNull;

public class Adapter
    extends RecyclerView.Adapter<Adapter.ViewHolder> {

    List<Modelclass> bars;
    Context context;

    Adapter(Context c, List<Modelclass> list)
    {
        bars = list;
        context = c;
    }

    @NonNull
    @NotNull
    @Override
    @SuppressLint("ResourceType")
    public ViewHolder
    onCreateViewHolder(@NonNull @NotNull ViewGroup parent,
                       int viewType)
    {
        View view
            = LayoutInflater.from(parent.getContext())
                  .inflate(R.layout.bars, parent, false);
        return new ViewHolder(view);
    }

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    @Override
    public void onBindViewHolder(
        @NonNull @NotNull Adapter.ViewHolder holder,
        int position)
    {

        // Getting the color for every position
        String color = bars.get(position).getColor();

        // Set the color to the bar
        if (color.equals("Yellow")) {
            holder.linearLayout.setBackgroundTintList(
                context.getResources().getColorStateList(
                    R.color.yellow));
        }
        else {
            holder.linearLayout.setBackgroundTintList(
                context.getResources().getColorStateList(
                    R.color.Red));
        }
    }

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

    public class ViewHolder
        extends RecyclerView.ViewHolder {
        LinearLayout linearLayout;
        public ViewHolder(@NonNull @org.
                          jetbrains.annotations.
                          NotNull View itemView)
        {
            super(itemView);
            linearLayout
                = itemView.findViewById(R.id.barlayout);
        }
    }
}

public class Modelclass {
    String color;
    Modelclass(String color){
        this.color=color;
    }
    public String getColor() {
        return color;
    }
}