code: public void showMe(Answer<T> callback) {
          CalculusTask<T> task = new CalculusTask(image,calculus,callback);
  
          if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
  
              if(executor == null) {
                  executor = AsyncTask.THREAD_POOL_EXECUTOR;
              }
  
              task.executeOnExecutor(executor);
          } else {
              task.execute();
          }
  
      }
docs: Executes the calculation. Must be called after a {@link com.kimo.lib.alexei.Calculus} is set.
  
  @param callback to use when the calculation finish. The callback will be called in UI thread.