Congelación de subprocesos de UI con AsyncTask

Question

Estoy tratando de usar un AsyncTask para descargar un archivo con un progreso de notificación. Todo funciona bien (descargas en el hilo de fondo), excepto que cada vez que agrego el código para actualizar la barra de progreso a través del publishProgress(), se congela todo el teléfono, hasta que la descarga finalice y la notificación muestre "Descarga completada".

Estoy completamente perdido en cuanto a por qué este es el caso, pero quizás estoy pensando que es a lo largo de las líneas del publishProgress((downloadedSize/totalSize) * 100) que estoy usando?

De todas formas aquí es el DownloadDataTask:

protected String doInBackground(RomDataSet... params) { 
     try { 

      // Download file here, all good 

      //now, read through the input buffer and write the contents to the file 
      while ((bufferLength = inputStream.read(buffer)) > 0) { 
       //add the data in the buffer to the file in the file output stream (the file on the sd card 
       fileOutput.write(buffer, 0, bufferLength); 
       //add up the size so we know how much is downloaded 
       downloadedSize += bufferLength; 
       //this is where you would do something to report the prgress, like this maybe 

       publishProgress((downloadedSize/totalSize) * 100); 
      } 
      //close the output stream when done 
      fileOutput.close(); 

     //catch some possible errors... 
     } catch (MalformedURLException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
     return null; 
    } 

    @Override 
    protected void onPreExecute() { 
     Intent intent = new Intent(ListActivity.this, ListActivity.class); 
     pendingIntent = PendingIntent.getActivity(getApplicationContext(), 0, intent, 0); 

     // configure the notification 
     notification = new Notification(R.drawable.ic_stat_rom, "Downloading Rom via RomGet", System 
       .currentTimeMillis()); 
     notification.flags = notification.flags | Notification.FLAG_ONGOING_EVENT; 
     notification.contentView = new RemoteViews(getApplicationContext().getPackageName(), R.layout.layout_download); 
     notification.contentIntent = pendingIntent; 
     notification.contentView.setImageViewResource(R.id.status_icon, R.drawable.icon_rom); 
     notification.contentView.setTextViewText(R.id.download_description, "Downloading"); 
     notification.contentView.setProgressBar(R.id.download_progress, 100, 0, false); 

     getApplicationContext(); 
     notificationManager = (NotificationManager) getApplicationContext().getSystemService(
       Context.NOTIFICATION_SERVICE); 

     notificationManager.notify(43, notification); 
    } 

    @Override 
    protected void onProgressUpdate(Integer... progress) { 
     //notification.contentView.setProgressBar(R.id.download_progress, 100, Math.round(progress[0]), false); 
     notification.contentView.setTextViewText(R.id.download_description, Integer.toString(progress[0])); 
     // inform the progress bar of updates in progress 
     notificationManager.notify(43, notification); 
    } 

    @Override 
    protected void onPostExecute(String result) { 
     notification.contentView.setProgressBar(R.id.download_progress, 100, 100, false); 
     notification.contentView.setTextViewText(R.id.download_description, "Done"); 
     notificationManager.notify(43, notification); 
    } 

estoy realmente atascado en este caso - Cualquier ayuda sería apreciada. Cheers

@Override 
    protected void onProgressUpdate(Integer... progress) { 
     if ((progress[0] - lastSize) > 5000) { 
      lastSize = progress[0]; 
      notification.contentView.setProgressBar(R.id.download_progress, totalSize, progress[0], false); 
      //notification.contentView.setTextViewText(R.id.download_description, Integer.toString(progress[0])); 
      // inform the progress bar of updates in progress 
      notificationManager.notify(43, notification); 
     } 
    } 

Answer 1

Utilice un operador de mod para actualizar solo en 5, 10 o 20%. Llamas constantemente a OngressUpdate() durante la descarga.

if (downloadedSize % (totalSize/20) == 0) { // 20 updates every 5%, 10 every 10% and 5 every 20%, etc. 
    publishProgress((downloadedSize/totalSize) * 100); 
}