Come scaricare file (pdf, doc ecc ...) in sdcard e aprire il file usando volley in Android?

Question

Nella mia app per android ho bisogno di scaricare un file nella mia scheda SD e visualizzarlo tramite intenti, sto usando la libreria di volley per tutte le chiamate di rete nella mia applicazione. Idee.

Answer 1

class DownloadFileFromURL extends AsyncTask<String, String, String> { 

    /** 
    * Before starting background thread 
    * Show Progress Bar Dialog 
    * */ 
    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     showDialog(progress_bar_type); 
    } 

    /** 
    * Downloading file in background thread 
    * */ 
    @Override 
    protected String doInBackground(String... f_url) { 
     int count; 
     try { 
      URL url = new URL(f_url[0]); 
      URLConnection conection = url.openConnection(); 
      conection.connect(); 
      // this will be useful so that you can show a tipical 0-100%   progress bar 
      int lenghtOfFile = conection.getContentLength(); 

      // download the file 
      InputStream input = new BufferedInputStream(url.openStream(), 8192); 

      // Output stream 
      OutputStream output = new FileOutputStream("/sdcard/downloadedfile.jpg"); 

      byte data[] = new byte[1024]; 

      long total = 0; 

      while ((count = input.read(data)) != -1) { 
       total += count; 
       // publishing the progress.... 
       // After this onProgressUpdate will be called 
       publishProgress(""+(int)((total*100)/lenghtOfFile)); 

       // writing data to file 
       output.write(data, 0, count); 
      } 

      // flushing output 
      output.flush(); 

      // closing streams 
      output.close(); 
      input.close(); 

     } catch (Exception e) { 
      Log.e("Error: ", e.getMessage()); 
     } 

     return null; 
    } 

    /** 
    * Updating progress bar 
    * */ 
    protected void onProgressUpdate(String... progress) { 
     // setting progress percentage 
     pDialog.setProgress(Integer.parseInt(progress[0])); 
    } 

    /** 
    * After completing background task 
    * Dismiss the progress dialog 
    * **/ 
    @Override 
    protected void onPostExecute(String file_url) { 
     // dismiss the dialog after the file was downloaded 
     dismissDialog(progress_bar_type); 

     // Displaying downloaded image into image view 
     // Reading image path from sdcard 
     String imagePath = Environment.getExternalStorageDirectory().toString() + "/downloadedfile.jpg"; 
     // setting downloaded into image view 

    } 

} 

}