How to Download a PDF using a link and set the progress value on a ProgressBar in Android

To download a PDF using a link and set the progress value on a ProgressBar in Android, you can use the following steps:

1. Add internet permission to your AndroidManifest.xml file:

<uses-permission android:name="android.permission.INTERNET" />

2. Add a ProgressBar to your layout file:

<ProgressBar
    android:id="@+id/progressBar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:visibility="gone" />

3. In your activity or fragment, declare a variable for the ProgressBar and initialize it:

private ProgressBar progressBar;
progressBar = findViewById(R.id.progressBar);

4. Create a method to download the PDF from the link:

private void downloadPDF(String pdfUrl) {
    // Show progress bar
    progressBar.setVisibility(View.VISIBLE);

    // Create download request
    DownloadManager.Request request = new DownloadManager.Request(Uri.parse(pdfUrl));
    request.setDescription("Downloading PDF...");
    request.setTitle("PDF Download");
    request.allowScanningByMediaScanner();
    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
    request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "my_pdf.pdf");

    // Get download service and enqueue file
    DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
    manager.enqueue(request);

    // Set up a broadcast receiver to listen for when download is complete
    BroadcastReceiver onComplete = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            // Hide progress bar
            progressBar.setVisibility(View.GONE);
            // Unregister receiver
            unregisterReceiver(this);
        }
    };
    // Register receiver for when download is complete
    registerReceiver(onComplete, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}

5. Call the downloadPDF method when you want to start the download:

String pdfUrl = "https://example.com/my_pdf.pdf";
downloadPDF(pdfUrl);

6. To set the progress value on the ProgressBar, you can use the DownloadManager’s query method to get information about the download, including the current progress:

private void setProgressValue(long downloadId) {
    DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);

    DownloadManager.Query query = new DownloadManager.Query();
    query.setFilterById(downloadId);

    Cursor cursor = manager.query(query);
    if (cursor.moveToFirst()) {
        int bytesDownloaded = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));
        int bytesTotal = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));

        if (bytesTotal > 0) {
            int progress = (int) ((bytesDownloaded * 100L) / bytesTotal);
            progressBar.setProgress(progress);
        }
    }
    cursor.close();
}

7. To continuously update the progress value, you can use a Handler and a Runnable to periodically call the setProgressValue method:

private Handler handler = new Handler();
private Runnable runnable = new Runnable() {
    @Override
    public void run() {
        setProgressValue(downloadId);
        handler.postDelayed(this, 1000);
    }
};

private long downloadId;

private void downloadPDF(String pdfUrl) {
    // Show progress bar
    progressBar.setVisibility(View.VISIBLE);

    // Create download request
    DownloadManager.Request request = new DownloadManager.Request(Uri.parse(pdfUrl));
    request.setDescription("Downloading PDF...");
    request.setTitle("PDF Download");
    request.allowScanningByMediaScanner();
    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
    request.setDestinationInExternalPublicDir(Environment