public TextToPdfAsync(TextToPDFUtils textToPDFutil, TextToPDFOptions textToPDFOptions,
                          String fileextension, OnTextToPdfInterface onPDFCreatedInterface) {
        this.mTexttoPDFUtil = textToPDFutil;
        this.mTextToPdfOptions = textToPDFOptions;
        this.mFileExtension = fileextension;