code: public void invalidate(@Nullable String path) {
      if (path != null) {
        invalidate(Uri.parse(path));
      }
    }
docs: Invalidate all memory cached images for the specified {@code path}. You can also pass a
  {@linkplain RequestCreator#stableKey stable key}.
  
  @see #invalidate(Uri)
  @see #invalidate(File)