How to correctly save the value in sharedPreferences? - Flutter - flutter

Question

Where am I going wrong?
I have login with google to get the token and send it to graphgl, this token is saved (it was meant to be) in sharedpreferences, but it is not saving, I have the following action (mobx).
#action
Future loginWithGoogle() async {
user = await _authRepository.getGoogleLogin();
final idToken = await user.getIdToken();
print('Bearer ${idToken.token}');
sharedPreferenceService.setToken('Bearer ${idToken.token}');
}
Services shared.
class SharedPreferenceService {
SharedPreferences _prefs;
Future<bool> getSharedPreferencesInstance() async {
_prefs = await SharedPreferences.getInstance().catchError((e) {
print("shared prefrences error : $e");
return false;
});
return true;
}
Future setToken(String token) async {
await _prefs.setString('token', token);
}
Future clearToken() async {
await _prefs.clear();
}
Future<String> get token async => _prefs.getString('token');
}
SharedPreferenceService sharedPreferenceService = SharedPreferenceService();
Action login in view.
#action
Future loginWithGoogle() async {
try {
loading = true;
await auth.loginWithGoogle();
Modular.to.pushReplacementNamed('/index');
} catch (e) {
loading = false;
}
}
The login happens normal but it accuses error when it goes to index, informing that it received null the getString("token").
I/flutter ( 3198): ClientException: Unhandled Failure NoSuchMethodError: The method 'getString' was called on null.
I/flutter ( 3198): Receiver: null
I/flutter ( 3198): Tried calling: getString("token")
This token string is not being saved.
Sorry for bad english

Answer 1

Just copied your code and made some changes just check:
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
#override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
SharedPreferenceService sharedPreferenceService = SharedPreferenceService();
#override
void initState() {
super.initState();
loginWithGoogle();
getSharedValues();
}
getSharedValues() async{
bool value = await sharedPreferenceService.getSharedPreferencesInstance();
if(value)
print(await sharedPreferenceService.token);
}
loginWithGoogle() async {
// this is the where you get your bearer, but time being I have taken sample bearer
String token =
'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJZb3VuaXNaYXJnYXIiLCJlbWFpbCI6InlvdW5pc0BiYXh0dXJlLmNvbSIsImp0aSI6IjlhNjc2OTVlLTBiZmEtNDdmMy04ZTVlLWVhYWMzY2VmNmRlOSIsIklkIjoiMSIsIkVtYWlsIjoieW91bmlzQGJheHR1cmUuY29tIiwiZXhwIjoxNTgzODQ2ODU0LCJpc3MiOiJQYWNpZmljIFByaW50aW5nIiwiYXVkIjoiUGFjaWZpYyBQcmludGluZyJ9.CKxBwAB7YeOKJRmoCg4_JAhJKHP2qXb7KJXPysqmbAs';
bool value = await sharedPreferenceService.getSharedPreferencesInstance();
if (value == true) {
sharedPreferenceService.setToken('Bearer $token');
}
}
#override
Widget build(BuildContext context) {
return MaterialApp(home: Scaffold(body: Center(child: Text('sample'))));
}
}
class SharedPreferenceService {
SharedPreferences _prefs;
Future<bool> getSharedPreferencesInstance() async {
_prefs = await SharedPreferences.getInstance().catchError((e) {
print("shared prefrences error : $e");
return false;
});
return true;
}
Future setToken(String token) async {
await _prefs.setString('token', token);
}
Future clearToken() async {
await _prefs.clear();
}
Future<String> get token async => _prefs.getString('token');
}

Answer 2

Thank you very much, I made the correction in the action.
#action
Future loginWithGoogle() async {
user = await _authRepository.getGoogleLogin();
final idToken = await user.getIdToken();
print('Bearer ${idToken.token}');
bool value = await sharedPreferenceService.getSharedPreferencesInstance();
if (value == true) {
sharedPreferenceService.setToken('Bearer ${idToken.token}');
}
}