AlertDialog在onPostExecute沒有顯示

Question

我試圖表現出對一個的AsyncTask

@Override 
protected void onPostExecute(HttpResponse response) { 
if (response == null) { 
      Log.d(TAG, "onPostExecute, response == null"); 
      AlertDialog.Builder builder = new AlertDialog.Builder(ConfirmPhoneNoCode.this); 
      builder.setMessage("Are you sure you want to exit?").setCancelable(false) 
        .setPositiveButton("Yes", new DialogInterface.OnClickListener() { 
         public void onClick(DialogInterface dialog, int id) { 
          ConfirmPhoneNoCode.this.finish(); 
         } 
        }).setNegativeButton("No", new DialogInterface.OnClickListener() { 
         public void onClick(DialogInterface dialog, int id) { 
          dialog.cancel(); 
         } 
        }); 
      AlertDialog alert = builder.create(); 
     } else { 
      int responseCode = response.getStatusLine().getStatusCode(); 
      String message = response.getStatusLine().getReasonPhrase(); 
      Log.d(TAG, "Response Code: " + String.valueOf(responseCode)); 
      Log.d(TAG, "Message: " + message); 
     } 
    } 

onPostExecute方法的對話框我收到日誌消息

03-31 23:02:42.912: D/ConfirmPhoneCode(21966): onPostExecute, response == null 

這意味着

if(response == null) is executed but AlertDialog box don't show-up. 

如果有人能幫助我，我將不勝感激。

在此先感謝。

Answer 1

alert.show();我認爲你必須添加它...

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

Answer 2

看起來不錯給我。你打電話給alert.show()嗎？