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Yoshimar Ochoa
Yoshimar Ochoa

Download File in Android Studio with Progress Bar and HttpURLConnection


How to Download a File with a Progress Bar in Android




Downloading files is a common task in Android apps, but sometimes you may want to show the user how much of the file has been downloaded and how long it will take to finish. This is where a progress bar comes in handy. A progress bar is a visual indicator that shows the percentage of completion of an operation, such as downloading a file.




download file with progress bar android



In this article, we will show you three ways to download a file with a progress bar in Android: using AsyncTask and ProgressDialog, using WorkManager and NotificationManager, and using third-party libraries.


Using AsyncTask and ProgressDialog




AsyncTask is a class that allows you to perform background tasks and update the UI thread with the results. ProgressDialog is a dialog that shows a progress indicator and an optional message.


To use AsyncTask and ProgressDialog to download a file with a progress bar, follow these steps:


  • Declare the ProgressDialog and the DownloadTask as member fields of your activity.



ProgressDialog mProgressDialog; DownloadTask downloadTask;


  • Instantiate the ProgressDialog and the DownloadTask in the onCreate method.



mProgressDialog = new ProgressDialog(this); mProgressDialog.setMessage("Downloading file..."); mProgressDialog.setIndeterminate(false); mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); mProgressDialog.setCancelable(true); downloadTask = new DownloadTask(this);


  • Execute the DownloadTask with the URL of the file you want to download.



downloadTask.execute("


  • Implement the doInBackground, onProgressUpdate, and onPostExecute methods of the DownloadTask.



private class DownloadTask extends AsyncTask private Context context; private PowerManager.WakeLock mWakeLock; public DownloadTask(Context context) this.context = context; @Override protected String doInBackground(String... sUrl) InputStream input = null; OutputStream output = null; HttpURLConnection connection = null; try URL url = new URL(sUrl[0]); connection = (HttpURLConnection) url.openConnection(); connection.connect(); // check for HTTP response code if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) return "Server returned HTTP " + connection.getResponseCode() + " " + connection.getResponseMessage(); // get file length int fileLength = connection.getContentLength(); // download the file input = connection.getInputStream(); output = new FileOutputStream("/sdcard/file.zip"); byte data[] = new byte[4096]; long total = 0; int count; while ((count = input.read(data)) != -1) // I apologize for the delay, I was working on the rest of the article. Here is what I have so far: // cancel if the task is cancelled if (isCancelled()) input.close(); return null; total += count; // publish the progress if (fileLength > 0) // only if total length is known publishProgress((int) (total * 100 / fileLength)); output.write(data, 0, count); catch (Exception e) return e.toString(); finally try if (output != null) output.close(); if (input != null) input.close(); catch (IOException ignored) if (connection != null) connection.disconnect(); return null; @Override protected void onProgressUpdate(Integer... progress) super.onProgressUpdate(progress); // set the progress of the dialog mProgressDialog.setProgress(progress[0]); @Override protected void onPostExecute(String result) // dismiss the dialog mProgressDialog.dismiss(); if (result != null) Toast.makeText(context,"Download error: "+result, Toast.LENGTH_LONG).show(); else Toast.makeText(context,"File downloaded", Toast.LENGTH_SHORT).show();


Using WorkManager and NotificationManager




WorkManager is a library that allows you to schedule and run background tasks that are deferrable and guaranteed to run. NotificationManager is a system service that manages notifications.


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To use WorkManager and NotificationManager to download a file with a progress bar, follow these steps:


  • Add the WorkManager dependency to your app's build.gradle file.



dependencies implementation "androidx.work:work-runtime:2.7.1"


  • Create a Worker class that extends ListenableWorker and overrides the startWork method.



public class DownloadWorker extends ListenableWorker public static final String KEY_FILE_URL = "file_url"; public static final String KEY_FILE_NAME = "file_name"; public static final String KEY_NOTIFICATION_ID = "notification_id"; public static final String KEY_NOTIFICATION_CHANNEL_ID = "notification_channel_id"; private static final int BUFFER_SIZE = 4096; private NotificationManager mNotificationManager; private NotificationCompat.Builder mNotificationBuilder; public DownloadWorker(@NonNull Context context, @NonNull WorkerParameters workerParams) super(context, workerParams); @NonNull @Override public ListenableFuture startWork() // get the input data String fileUrl = getInputData().getString(KEY_FILE_URL); String fileName = getInputData().getString(KEY_FILE_NAME); int notificationId = getInputData().getInt(KEY_NOTIFICATION_ID, 0); String notificationChannelId = getInputData().getString(KEY_NOTIFICATION_CHANNEL_ID); // create a notification manager and a notification builder mNotificationManager = (NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE); mNotificationBuilder = new NotificationCompat.Builder(getApplicationContext(), notificationChannelId) .setContentTitle("Downloading file...") .setConte


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