Download files in background service

Service class
class DownloadService extends IntentService {
    RetrofitConnection retrofitInterface;
    public DownloadService() {
        super("Download Service");
    }
    private NotificationCompat.Builder notificationBuilder;
    private NotificationManager notificationManager;
    private int totalFileSize;
    private String image_url;
    int type;
    String filename;
    @Override    protected void onHandleIntent(Intent intent) {

        if (intent.getExtras() != null && intent != null) {
            image_url = intent.getStringExtra("img");
            type = intent.getIntExtra("type", 0);
            filename = intent.getStringExtra("filename");
            Log.e("TYPE", "" + type);
        }

        notificationManager = (NotificationManager) 
getSystemService(Context.NOTIFICATION_SERVICE);
        notificationBuilder = new NotificationCompat.Builder(this)
                .setSmallIcon(R.mipmap.downd)
                .setContentTitle("Download")
                .setContentText("Downloading image")
                .setAutoCancel(true);
notificationBuilder.getNotification().flags |= Notification.FLAG_AUTO_CANCEL;
        notificationManager.notify(0, notificationBuilder.build());

        if (NetworkChecking.isConnected(getApplicationContext())) {
            initDownload(image_url);
        } else {
            Utils.toastMessage(getApplicationContext(), 
Utils.network_message);
        }

    }

    private void initDownload(String url) {
      
            downloadFile(request.execute().body());
        } catch (IOException e) {
            e.printStackTrace();
            Toast.makeText(getApplicationContext(), e.getMessage(),
 Toast.LENGTH_SHORT).show();
    }
        }

    private void downloadFile(ResponseBody body) throws IOException {

       
        int count;
        byte data[] = new byte[1024 * 4];
        long fileSize = body.contentLength();
        InputStream bis = new BufferedInputStream(body.byteStream(), 
1024 * 8);
       
        Log.e("outputFile", "" + outputFile);
        OutputStream output = new FileOutputStream(outputFile);
        long total = 0;
        long startTime = System.currentTimeMillis();
        int timeCount = 1;
        while ((count = bis.read(data)) != -1) {
            total += count;
            totalFileSize = (int) (fileSize / (Math.pow(1024, 2)));
            double current = Math.round(total / (Math.pow(1024, 2)));
            int progress = (int) ((total * 100) / fileSize);
            long currentTime = System.currentTimeMillis() - startTime;
            Download download = new Download();
            download.setTotalFileSize(totalFileSize);
            if (currentTime > 1000 * timeCount) {
                download.setCurrentFileSize((int) current);
                download.setProgress(progress);
                sendNotification(download,outputFile.getPath());
                timeCount++;
            }

            output.write(data, 0, count);        }
        onDownloadComplete(outputFile.getPath());
        output.flush();
        output.close();
    private void sendNotification(Download download,String filePath) {
        bis.close();

    }

        File file = new File(filePath);
        MimeTypeMap map = MimeTypeMap.getSingleton();
        String ext = MimeTypeMap.getFileExtensionFromUrl(
file.getName());
        String type = map.getMimeTypeFromExtension(ext);
        if (type == null)
            type = "*/*";
        Intent intent = new Intent(Intent.ACTION_VIEW);
        Uri data = Uri.fromFile(file);
        intent.setDataAndType(data, type);
        sendIntent(download);
        notificationBuilder.setProgress(100, download.getProgress(),
 false);
        notificationBuilder.setContentText("Downloading file " + 
download.getCurrentFileSize() + "/" + totalFileSize + " MB");
        notificationBuilder.setContentIntent
(PendingIntent.getActivity(getApplicationContext(), 0, intent,
 PendingIntent.FLAG_CANCEL_CURRENT));
        notificationManager.notify(0, notificationBuilder.build());


    }

    private void sendIntent(Download download) {
        Intent intent = new Intent(ShowImageActivity.MESSAGE_PROGRESS);
        intent.putExtra("download", download);
        LocalBroadcastManager.getInstance(DownloadService.this).
sendBroadcast(intent);    }

    private void onDownloadComplete(String filePath) {
        Download download = new Download();
        download.setProgress(100);
        sendIntent(download);
        File file = new File(filePath);
        MimeTypeMap map = MimeTypeMap.getSingleton();
        String ext = MimeTypeMap.getFileExtensionFromUrl
(file.getName());
        String type = map.getMimeTypeFromExtension(ext);
        if (type == null)
            type = "*/*";
        Intent intent = new Intent(Intent.ACTION_VIEW);
        Uri data = Uri.fromFile(file);
        intent.setDataAndType(data, type);
        notificationManager.cancel(0);
        notificationBuilder.setProgress(0, 0, false);
        notificationBuilder.setContentText("File Downloaded");
        notificationBuilder.setContentIntent
(PendingIntent.getActivity(getApplicationContext(), 0, intent, 
PendingIntent.FLAG_CANCEL_CURRENT));
        notificationManager.notify(0, notificationBuilder.build());
    }

    @Override    public void onTaskRemoved(Intent rootIntent) {
        notificationManager.cancel(0);
    }

    public File getOutputMediaFile(int type) {
        String folder_name = "TYC";
File mediaStorageDir = new File(Environment.
getExternalStorageDirectory() + "/" + folder_name, "IMAGES");

        if (!mediaStorageDir.exists()) {
            mediaStorageDir.mkdirs();
        }


File f1 = new File(Environment.getExternalStorageDirectory()
 + "/" + folder_name, "DOCUMENTS");
if (!f1.exists()) {
    f1.mkdirs();
}


Locale.getDefault()).format(new Date());
File mediaFile;
mediaFile = new File(mediaStorageDir.getPath() +
File.separator + "img_" + timeStamp + ".jpg");
} else if (type == 2) {
 mediaFile = new File(f1.getPath() + File.separator
+ "PDF_" + timeStamp + ".pdf");
}  else if (type == 3) {
    mediaFile = new File(f1.getPath() + File.separator
+ filename);
}else {
    return null;
}
return mediaFile;}


}

Call service from Button click
Intent intent = new Intent(getActivity(), DownloadService.class);
intent.putExtra("img", "pass your file path");
intent.putExtra("type", 3);
intent.putExtra("filename", "Pass here your file name");
startService(intent);