downloadAndSaveFile static method
Implementation
static Future<String> downloadAndSaveFile({ required String url, required String fileName}) async {
final Directory directory = await getApplicationDocumentsDirectory();
final String filePath = '${directory.path}/$fileName';
final http.Response response = await http.get(Uri.parse(url));
final File file = File(filePath);
await file.writeAsBytes(response.bodyBytes);
return filePath;
}