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class DownloadWorker(context: Context, parameters: WorkerParameters) :    CoroutineWorker(context, parameters) {     private val notificationManager =        context.getSystemService(Context.NOTIFICATION_SERVICE) as                NotificationManager     override suspend fun doWork(): Result {        val inputUrl = inputData.getString(KEY_INPUT_URL)                       ?: return Result.failure()        val outputFile = inputData.getString(KEY_OUTPUT_FILE_NAME)                       ?: return Result.failure()        // Mark the Worker as important        val progress = "Starting Download"        setForeground(createForegroundInfo(progress))        download(inputUrl, outputFile)        return Result.success()    }     private fun download(inputUrl: String, outputFile: String) {        // Downloads a file and updates bytes read        // Calls setForeground() periodically when it needs to update        // the ongoing Notification    }    // Creates an instance of ForegroundInfo which can be used to update the    // ongoing notification.    private fun createForegroundInfo(progress: String): ForegroundInfo {        val id = applicationContext.getString(R.string.notification_channel_id)        val title = applicationContext.getString(R.string.notification_title)        val cancel = applicationContext.getString(R.string.cancel_download)        // This PendingIntent can be used to cancel the worker        val intent = WorkManager.getInstance(applicationContext)                .createCancelPendingIntent(getId())         // Create a Notification channel if necessary        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {            createChannel()        }         val notification = NotificationCompat.Builder(applicationContext, id)            .setContentTitle(title)            .setTicker(title)            .setContentText(progress)            .setSmallIcon(R.drawable.ic_work_notification)            .setOngoing(true)            // Add the cancel action to the notification which can            // be used to cancel the worker            .addAction(android.R.drawable.ic_delete, cancel, intent)            .build()         return ForegroundInfo(notificationId, notification)    }     @RequiresApi(Build.VERSION_CODES.O)    private fun createChannel() {        // Create a Notification channel    }     companion object {        const val KEY_INPUT_URL = "KEY_INPUT_URL"        const val KEY_OUTPUT_FILE_NAME = "KEY_OUTPUT_FILE_NAME"    } } 

public class DownloadWorker extends Worker {    private static final String KEY_INPUT_URL = "KEY_INPUT_URL";    private static final String KEY_OUTPUT_FILE_NAME = "KEY_OUTPUT_FILE_NAME";     private NotificationManager notificationManager;     public DownloadWorker(        @NonNull Context context,        @NonNull WorkerParameters parameters) {            super(context, parameters);            notificationManager = (NotificationManager)                context.getSystemService(NOTIFICATION_SERVICE);    }     @NonNull    @Override    public Result doWork() {        Data inputData = getInputData();        String inputUrl = inputData.getString(KEY_INPUT_URL);        String outputFile = inputData.getString(KEY_OUTPUT_FILE_NAME);        // Mark the Worker as important        String progress = "Starting Download";        setForegroundAsync(createForegroundInfo(progress));        download(inputUrl, outputFile);        return Result.success();    }     private void download(String inputUrl, String outputFile) {        // Downloads a file and updates bytes read        // Calls setForegroundAsync(createForegroundInfo(myProgress))        // periodically when it needs to update the ongoing Notification.    }     @NonNull    private ForegroundInfo createForegroundInfo(@NonNull String progress) {        // Build a notification using bytesRead and contentLength         Context context = getApplicationContext();        String id = context.getString(R.string.notification_channel_id);        String title = context.getString(R.string.notification_title);        String cancel = context.getString(R.string.cancel_download);        // This PendingIntent can be used to cancel the worker        PendingIntent intent = WorkManager.getInstance(context)                .createCancelPendingIntent(getId());         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {            createChannel();        }         Notification notification = new NotificationCompat.Builder(context, id)                .setContentTitle(title)                .setTicker(title)                .setSmallIcon(R.drawable.ic_work_notification)                .setOngoing(true)                // Add the cancel action to the notification which can                // be used to cancel the worker                .addAction(android.R.drawable.ic_delete, cancel, intent)                .build();         return new ForegroundInfo(notificationId, notification);    }     @RequiresApi(Build.VERSION_CODES.O)    private void createChannel() {        // Create a Notification channel    } } 

<service    android:name="androidx.work.impl.foreground.SystemForegroundService"    android:foregroundServiceType="location|microphone"    tools:node="merge" />