code: Drawable getPlaceholder(int position) {
      Drawable placeholder = placeholders[position];
      if (placeholder == null && defaultPlaceholder != null) {
        Drawable clone = defaultPlaceholder.getConstantState().newDrawable();
        placeholders[position] = clone;
        placeholder = clone;
      }
      return placeholder;
    }
docs: Returns the defaultPlaceholder associated to a NoxItem instance given a position or null if
  the resource wasn't downloaded or previously configured.