How to Request Permissions in Android Application?

package org.geeksforgeeks.demo;

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.widget.Button;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    // Unique request code for permission request
    private static final int PERMISSION_REQUEST_CODE = 123;

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

        // Find the button in the layout and set a click listener
        Button button = findViewById(R.id.button);
        button.setOnClickListener(v -> requestPermissions());
    }

    // Function to check and request necessary permissions
    private void requestPermissions() {
        
        // List of permissions the app may need
        String[] permissions = {
            Manifest.permission.ACCESS_COARSE_LOCATION,
            Manifest.permission.ACCESS_FINE_LOCATION,
            Manifest.permission.CAMERA,
            Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.WRITE_EXTERNAL_STORAGE
        };

        List<String> permissionsToRequest = new ArrayList<>();

        // Filter out the permissions that are not yet granted
        for (String permission : permissions) {
            if (ContextCompat.checkSelfPermission(this, permission) != PackageManager.PERMISSION_GRANTED) {
                permissionsToRequest.add(permission);
            }
        }

        // If there are permissions that need to
        // be requested, ask the user for them
        if (!permissionsToRequest.isEmpty()) {
            ActivityCompat.requestPermissions(
                this,
                permissionsToRequest.toArray(new String[0]), // Convert list to array
                PERMISSION_REQUEST_CODE // Pass the request code
            );
        } else {
            // All permissions are already granted
            Toast.makeText(this, "All permissions already granted", Toast.LENGTH_SHORT).show();
        }
    }

    // Callback function that handles the
    // result of the permission request
    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        if (requestCode == PERMISSION_REQUEST_CODE) {
            List<String> deniedPermissions = new ArrayList<>();

            // Check which permissions were denied
            for (int i = 0; i < permissions.length; i++) {
                if (grantResults[i] != PackageManager.PERMISSION_GRANTED) {
                    deniedPermissions.add(permissions[i]);
                }
            }

            if (deniedPermissions.isEmpty()) {
                
                // All permissions granted
                Toast.makeText(this, "All permissions granted", Toast.LENGTH_SHORT).show();
            } else {
                
                // Some permissions were denied, show them in a Toast
                Toast.makeText(this, "Permissions denied: " + deniedPermissions, Toast.LENGTH_LONG).show();
            }
        }
    }
}