Get object data from future flutter - flutter

Question

I have to check the email and password with the rest API that is going well. The problem is my future is returning a class object that has a token. I need that that for other screen and after login navigate to other screens.
Future<LoginResponse> createLoginState(String email, String password) async {
final http.Response response = await http.post(
'https://www.polestarkw.com/api/login',
headers: <String, String>{
'Accept': 'application/json',
//'content-type' : 'application/json'
},
body: {
"email":email ,
"password":password ,
});
if (response.statusCode == 200) {
// print(response.body);
LoginResponse loginResponse=LoginResponse.fromJson(json.decode(response.body)) ;
return loginResponse;
} else {
throw Exception('Failed to create album.');
}
}
class LoginResponse {
Object _data;
String token_type;
String expires_in;
String access_token;
String refresh_token;
LoginResponse(
{this.token_type, this.expires_in, this.access_token, this.refresh_token});
LoginResponse.fromJson(Map<String, dynamic> json) {
token_type = json['token_type'];
expires_in = json['expires_in'];
access_token = json['access_token'];
refresh_token = json['refresh_token'];
}
}
I need this loginResponse object on my other page. Here is using a future instance.
_futureJwt = createLoginState(emailController.text, pwdController.text);
how to get data from _futureJwt.

Answer 1

The code should go something like this
Future<LoginResponse> createLoginState(String email, String password) async {
final http.Response response = await http.post(
'https://www.polestarkw.com/api/login',
headers: <String, String>{
'Accept': 'application/json',
//'content-type' : 'application/json'
},
body: {
"email":email ,
"password":password ,
});
if (response.statusCode == 200) {
// print(response.body);
LoginResponse loginResponse=fromJson(json.decode(response.body)) ;
return loginResponse;
} else {
throw Exception('Failed to create album.');
}
}
LoginResponse fromJson(Map<String, dynamic> json) {
token_type = json['token_type'];
expires_in = json['expires_in'];
access_token = json['access_token'];
refresh_token = json['refresh_token'];
return LoginResponse(token_type,expires_in,access_token,refresh_token);
}
class LoginResponse {
Object _data;
String token_type;
String expires_in;
String access_token;
String refresh_token;
LoginResponse(
{this.token_type, this.expires_in, this.access_token, this.refresh_token});
}
The above code should work in the way u have written it too but I am not sure since I use this way
Then you can use this like
LoginResponse _futureJwt = await createLoginState(emailController.text, pwdController.text);
var token_type = _futureJwt.token_type;
var expires_in = _futureJwt.expires_in;
var access_token = _futureJwt.access_token;
var refresh_token = _futureJwt.refresh_token;
As simple as that. If you do not want to wait for the Future, you can use .then like this
createLoginState(emailController.text, pwdController.text).then((_futureJwt){
var token_type = _futureJwt.token_type;
var expires_in = _futureJwt.expires_in;
var access_token = _futureJwt.access_token;
var refresh_token = _futureJwt.refresh_token;
});

Answer 2

Use FutureBuilder.
Then you can use AsyncSnapshot to access hasData(), hasError() and get the data like so:
#override
Widget build(BuildContext context) {
Future<String> exampleFuture = Future.delayed(Duration(seconds: 2), "value")
return FutureBuilder(
future: exampleFuture,
builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
if (snapshot.hasError) {
return Text("error");
} else if (!snapshot.hasData) {
return Text("loading");
} else {
return Text(snapshot.data);
}
});
}