Passing Variable Token Key value in a Flutter Project - flutter

Question

I have an api_service.dart file and when the user logs in I save the json.decode(response.body)['key'] in a variable as Tkey. I want to be able to access it in the same file but in a different function when I am trying to access user details:
I am not sure how to apply this answer How to pass access token value in flutter to my code
class APIService {
static var client = http.Client();
static Future<bool> login(
LoginRequestModel model,
) async {
Map<String, String> requestHeaders = {
'Content-Type': 'application/json', };
var url = Uri.parse(
Config.apiURL + Config.loginAPI, );
var response = await client.post(
url,
headers: requestHeaders,
body: jsonEncode(model.toJson()), );
if (response.statusCode == 200) {
await SharedService.setLoginDetails(
loginResponseJson(
response.body, ), );
print("No.2 Test ${response.body}"); <-------{"key":"xxxxxxxxxx"}
var Tkey = json.decode(response.body)['key'];
print("No.2 Test $Tkey"); <-------------- xxxxxxxxxxxxx
return true;
} else {
return false; } }
static Future<User> fetchUser() async {
var url = Uri.parse(Config.apiURL + Config.userProfileAPI);
final response = await http.get(
url,
headers: {
HttpHeaders.authorizationHeader:
'Token $Tkey', <--------------- I want to print here the value of the key
}, );
final responseJson = jsonDecode(response.body);
print(responseJson);
if (response.statusCode == 200) {
return User.fromJson(jsonDecode(response.body));
} else {
throw Exception('Failed to load User');
} }}
My question how can I get access to the key to be used in the fetchUser() ?

Answer 1

Declare a global variable in the global scope or in a separate file, then when this method is executing, assign that key to it, then use it everywhere else in your app.
in a separate file:
String GlobalTkey = "";
now in your method replace the following:
print("No.2 Test ${response.body}"); <-------{"key":"xxxxxxxxxx"}
var Tkey = json.decode(response.body)['key'];
print("No.2 Test $Tkey"); <-------------- xxxxxxxxxxxxx
with this:
print("No.2 Test ${response.body}"); <-------{"key":"xxxxxxxxxx"}
var Tkey = json.decode(response.body)['key'];
GlobalTkey = Tkey; // you need to import the file where the variable exists
print("No.2 Test $Tkey"); <-------------- xxxxxxxxxxxxx
now everywhere in your app including different files, methods, widgets, classes... you can use GlobalTkey