[英]How to correctly save the value in sharedPreferences? - Flutter
我哪里错了? 我已使用谷歌登录以获取令牌并将其发送到graphgl,此令牌已保存(本来是)在sharedpreferences中,但它没有保存,我有以下操作(mobx)。
@action
Future loginWithGoogle() async {
user = await _authRepository.getGoogleLogin();
final idToken = await user.getIdToken();
print('Bearer ${idToken.token}');
sharedPreferenceService.setToken('Bearer ${idToken.token}');
}
服务共享。
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();
在视图中操作登录。
@action
Future loginWithGoogle() async {
try {
loading = true;
await auth.loginWithGoogle();
Modular.to.pushReplacementNamed('/index');
} catch (e) {
loading = false;
}
}
登录发生正常,但它在进入索引时指责错误,通知它收到了 null 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")
未保存此令牌字符串。 抱歉英语不好
刚刚复制了您的代码并进行了一些更改,只需检查:
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');
}
非常感谢,我在行动中进行了更正。
@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}');
}
}
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