Future<String> to String into FutureBuilder and Switch statement - flutter

Question

in my application i have a simple method as future which that return String as Future:
Future<String> _decodeLessonUrl(BuildContext context) async {
final ContactData data = await Provider.of<ContactDao>(context).getContacts();
final String encryptedUrl =
'encoded string';
final cryptor = new PlatformStringCryptor();
try {
final String decrypted = await cryptor.decrypt(encryptedUrl, '${data.code}');
return decrypted;
} on MacMismatchException {
return null;
}
}
i want to convert this future to simple String into FutureBuilder and Switch statement:
FutureBuilder<PlayLessonResponse>(
future: _myResponse,
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
if (snapshot.hasData) {
PlayLessonResponse response = snapshot.data;
switch (response.status) {
case -1: // payment is ok. show play view
final Future<String> decodedLink = _decodeLessonUrl(context);// <-- problem is in this line
return PlayerWidget(link:decodedLink);
}
}
}
return Center(
child: CircularProgressIndicator( ),
);
} ),
i get this error:
error: The argument type 'Future<String>' can't be assigned to the parameter type 'String'.
in that i couldn't use then because this method should be return Widget

Answer 1

For converting Future<String> to String you need to use FutureBuilder.
Replace This:
final Future<String> decodedLink = _decodeLessonUrl(context);
return PlayerWidget(link:decodedLink);
With this:
return FutureBuilder<String>(
future: _decodeLessonUrl(context);
builder: (context, snapshot) {
if(snapshot.hasData){
return PlayerWidget(link:snapshot.data);
}else{
return Center(
child: CircularProgressIndicator( ),
);
}
}
);