AlertDialog.Builder finish() résultats dans NPE

Question

J'essaie de faire une application qui sur un clic d'un élément de la liste commence une barre de progression affichant la progression du téléchargement. Pour une raison quelconque, l'élément de liste empêche la barre de progression de s'afficher. Voici le code:

final CharSequence[] items = { "View Information", "Lock", "Pin", 
       "Delete", "Ban User", "Ban IP", "Download" }; 

     AlertDialog.Builder builder = new AlertDialog.Builder(this); 
     builder.setTitle("Options"); 
     builder.setItems(items, new DialogInterface.OnClickListener() { 
      public void onClick(DialogInterface dialog, int item) { 
       Toast.makeText(getApplicationContext(), items[item], 
         Toast.LENGTH_SHORT).show(); 
       switch (item) { 
       case 0: 
        Intent i = new Intent(TestActivity.this, ActivityTwo.class); 
        i.putExtra("filename", files.get(position).getFilename()); 
        i.putExtra("orig_filename", files.get(position) 
          .getOriginalFilename()); 
        i.putExtra("date", files.get(position).getDate()); 
        i.putExtra("downloads", files.get(position).getDownloads()); 
        i.putExtra("uploader_ip", files.get(position) 
          .getUploaderIP()); 
        i.putExtra("username", files.get(position).getUsername()); 
        i.putExtra("locked", files.get(position).isLocked()); 
        i.putExtra("pinned", files.get(position).isPinned()); 
        startActivityForResult(i, REQUEST_CODE); 
       case 6: 
        downloadFile(files.get(position).getFilename(), files.get(position).getOriginalFilename()); 
       } 
      } 

     }); 
     AlertDialog alert = builder.create(); 
     alert.show(); 

Et les trois méthodes qui contrôlent la barre de progression.

private ProgressDialog progressDialog; 
    public void startProgress() { 
     progressDialog = new ProgressDialog(TestActivity.this); 
     progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); 
     progressDialog.setMessage("Loading..."); 
     progressDialog.setCancelable(false); 
     Log.d("Download", String.valueOf(progressDialog.getMax())); 
     progressDialog.show(); 
    } 

    public void updateProgress(int currentSize, int totalSize) { 
     Log.d("Download", String.valueOf((currentSize/totalSize) * 100)); 
     progressDialog.setProgress(((currentSize/totalSize) * 100)); 
    } 

    public void closeProgress() { 
     progressDialog.hide(); 
    } 

Le fichier de téléchargement qui lance la barre de progression.

if(alertDialog != null) { 
       alertDialog.dismiss(); 
      } 
      startProgress(); 

      // 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 
       updateProgress(downloadedSize, totalSize); 
      } 

      closeProgress(); 

est ici l'exception:

11-12 20:17:18.407: E/AndroidRuntime(4728): java.lang.NullPointerException 
11-12 20:17:18.407: E/AndroidRuntime(4728):  at com.evandarwin.android.TestActivity.downloadFile(TestActivity.java:244) 
11-12 20:17:18.407: E/AndroidRuntime(4728):  at com.evandarwin.android.TestActivity$1.onClick(TestActivity.java:143) 
11-12 20:17:18.407: E/AndroidRuntime(4728):  at com.android.internal.app.AlertController$AlertParams$3.onItemClick(AlertController.java:873) 
11-12 20:17:18.407: E/AndroidRuntime(4728):  at android.widget.AdapterView.performItemClick(AdapterView.java:284) 
11-12 20:17:18.407: E/AndroidRuntime(4728):  at android.widget.ListView.performItemClick(ListView.java:3513) 
11-12 20:17:18.407: E/AndroidRuntime(4728):  at android.widget.AbsListView$PerformClick.run(AbsListView.java:1812) 
11-12 20:17:18.407: E/AndroidRuntime(4728):  at android.os.Handler.handleCallback(Handler.java:587) 
11-12 20:17:18.407: E/AndroidRuntime(4728):  at android.os.Handler.dispatchMessage(Handler.java:92) 
11-12 20:17:18.407: E/AndroidRuntime(4728):  at android.os.Looper.loop(Looper.java:130) 
11-12 20:17:18.407: E/AndroidRuntime(4728):  at android.app.ActivityThread.main(ActivityThread.java:3683) 
11-12 20:17:18.407: E/AndroidRuntime(4728):  at java.lang.reflect.Method.invokeNative(Native Method) 
11-12 20:17:18.407: E/AndroidRuntime(4728):  at java.lang.reflect.Method.invoke(Method.java:507) 
11-12 20:17:18.407: E/AndroidRuntime(4728):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889) 
11-12 20:17:18.407: E/AndroidRuntime(4728):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:647) 
11-12 20:17:18.407: E/AndroidRuntime(4728):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

Vous n'avez pas mis les informations complètes. ce qui se passe dans downloadFile(). ajoutant break à la fin de case 0 pourrait aider la cause. (ajouter break à la fin de case 6 aussi)