How can i initialize a string from the result value of a method in flutter?-CodePudding

I'm trying to store the result of a method in a string , but i get errors

 String _location(dynamic media){
  return media['url'];
  }
 String myUrl = _location(media);

full class

class Home extends StatefulWidget {
 const Home({Key? key}) : super(key: key);

@override
State<Home> createState() => _HomeState();
 }

class _HomeState extends State<Home> {
 Future<List<dynamic>> fetchMedia() async {
 final result = await http
    .get(Uri.parse('https://iptv- 
 org.github.io/api/streams.json'));
 return json.decode(result.body);
 }


String _location(dynamic media) {
return media['url'];
}
String myUrl = _location(media);
...
}

The error says The instance member '_location' can't be accessed in an initializer. Try replacing the reference to the instance member with a different expression

How can i do this ??

CodePudding user response：

The problem is that I did not find that you have defined and inited the variable called media. You had defined a private function called _location it was fine, but when you were using this function you are passing an undefined and un-inited variable called media.

CodePudding user response：

try

late String myUrl;

void  _location(dynamic media){
  myUrl =  media['url'];
  }

_location(media);