Rx

gistfile1.txt

                    .map {
                        val response = ""
                        
                        val path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)
                                .absolutePath + File.separator + "hello_constants.txt"

                        File(path).printWriter().use { out ->
                            out.write(response)
                        }
                    }