How to Load PDF from URL in Android?

package org.geeksforgeeks.demo;

import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

import com.github.barteksc.pdfviewer.PDFView;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import javax.net.ssl.HttpsURLConnection;

public class MainActivity extends AppCompatActivity {

    // Declare the PDFView variable to display the PDF file.
    private PDFView pdfView;

    // URL of the PDF file to be loaded.
    private static final String PDF_URL = "https://icseindia.org/document/sample.pdf";

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

        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            WindowInsetsCompat systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });

        // Initialize the PDFView from the layout.
        pdfView = findViewById(R.id.pdfView);

        // Load the PDF from the specified URL.
        new LoadPdfTask().execute(PDF_URL);
    }

    /**
     * AsyncTask to load PDF in the background to prevent UI blocking.
     */
    private class LoadPdfTask extends AsyncTask<String, Void, InputStream> {

        @Override
        protected InputStream doInBackground(String... strings) {
            return fetchPdfStream(strings[0]);
        }

        @Override
        protected void onPostExecute(InputStream inputStream) {
            if (inputStream != null) {
                pdfView.fromStream(inputStream).load();
            } else {
                Toast.makeText(MainActivity.this, "Failed to load PDF. Check your internet connection.", Toast.LENGTH_SHORT).show();
            }
        }
    }

    /**
     * Fetches the PDF InputStream from the given URL.
     * Uses HTTPS connection to securely download the PDF file.
     */
    private InputStream fetchPdfStream(String urlString) {
        try {
            URL url = new URL(urlString);
            HttpsURLConnection urlConnection = (HttpsURLConnection) url.openConnection();

            // Check if the connection response is successful (HTTP 200 OK).
            if (urlConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                return new BufferedInputStream(urlConnection.getInputStream());
            } else {
                return null;
            }
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }
}