How do I get the content from an asset loaded with the extension?

[TIMAI2]

Thanks to everyone for all their suggestions, after much searching and testing, finally came up with this solution, which works for a text content file:

@SimpleFunction(description = "Reads the contents of a file in the extension's assets and return it as a string")
  public String ReadAssetFile() {
    final StringBuilder sb = new StringBuilder();

    try {
      final InputStream is = form.openAssetForExtension(this, "myStyleSheet.css");  //name of file here
      int character = is.read();
      while (character != -1) {
        sb.append((char) character);
        character = is.read();
      }
    } catch (IOException e) {
      e.printStackTrace();
    }

    return sb.toString();
  }