How to Display Download Progress in Alert Dialog box using Dio package - flutter

Question

I am Currently trying to download a file from URL using Dio Package. I can successfully download the file but I want to display the progress in an Alert Dialog and once Download is Successful Then it Should Display "Download Successful". I tried but couldn't find any solution
Packages I used are : Dio, Path_Provider and permission_handler.
my Code :
class WatchView extends StatefulWidget {
#override
_WatchViewState createState() => _WatchViewState();
}
class _WatchViewState extends State<WatchView> {
final Dio dio = Dio();
bool loading = false;
double progress = 0;
Future<bool> saveVideo(String url, String fileName) async {
Directory directory;
try {
if (Platform.isAndroid) {
if (await _requestPermission(Permission.storage)) {
String newPath =
"storage/emulated/0/Android/data/com.appname.test./files/";
print(directory);
newPath = newPath + "folder";
directory = Directory(newPath);
} else {
return false;
}
} else {
if (await _requestPermission(Permission.photos)) {
directory = await getTemporaryDirectory();
} else {
return false;
}
}
File saveFile = File(directory.path + "/$fileName");
if (!await directory.exists()) {
await directory.create(recursive: true);
}
if (await directory.exists()) {
await dio.download(url, saveFile.path,
onReceiveProgress: (value1, value2) {
setState(() {
progress = value1 / value2;
});
});
return true;
}
return false;
} catch (e) {
print(e);
return false;
}
}
Future<bool> _requestPermission(Permission permission) async {
if (await permission.isGranted) {
return true;
} else {
var result = await permission.request();
if (result == PermissionStatus.granted) {
return true;
}
}
return false;
}
downloadFile(String file1) async {
setState(() {
loading = true;
progress = 0;
});
bool downloaded = await saveVideo(file1, "test.file_extention");
if (downloaded) {
print("File Downloaded");
} else {
print("Problem Downloading File");
}
setState(() {
loading = false;
});
}
#override
Widget build(BuildContext context) {
var provider = Provider.of<ProviderModel>(context);
return Scaffold(
appBar: AppBar(
elevation: 0.0,
leading: GestureDetector(
onTap: () {
Navigator.pop(context);
},
child: Icon(Icons.arrow_back, color: Colors.white),
),
),
body: SingleChildScrollView(
physics: ClampingScrollPhysics(),
child: Container(
),
floatingActionButton: FloatingActionButton.extended(
label: Text(
'Download',
),
backgroundColor: Colors.indigo[700],
icon: Icon(Icons.download_rounded),
onPressed: () {
downloadFile(
"Download URL,
);
},
),
floatingActionButtonLocation:
FloatingActionButtonLocation.centerFloat,
);
},
);
}
}