/**
     * Create a file using java.io API
     */
    private File createFileInAppSpecificDir(String filename, String savedDir) {
        File newFile = new File(savedDir, filename);
        try {
            boolean rs = newFile.createNewFile();
            if (rs) {
                return newFile;
            } else {
                logError("It looks like you are trying to save file in public storage but not setting 'saveInPublicStorage' to 'true'");
            }
        } catch (IOException e) {
            e.printStackTrace();
            logError("Create a file using java.io API failed ");
        }
        return null;
    }

if (newFile.exists()) {
            return newFile;
}