setItems() method does not show me the list of items in Android

Question

I have written the following code in Android Studio to generate a list of String items. However, the problem is that when I run the code, the Android Studio does not indicate the list. I do not exactly know what is wrong with my code.

package com.example.practiceactivities;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.content.DialogInterface;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.*;

public class MainActivity extends AppCompatActivity {

AlertDialog.Builder builder;

Button button;

TextView txt;

 String [] Colors = {"Red","Green","Blue"};

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

     builder = new AlertDialog.Builder(MainActivity.this);
     button = findViewById(R.id.button);
     txt = findViewById(R.id.textt);

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

            builder.setTitle("Color Box")
                    .setMessage("Choose Your color")
                    .setItems(Colors, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialogInterface, int i) {

                            String color = Colors[i];
                            txt.setText(color);
                        }

                    })

                    .create().show();
        }
    });
}
}