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[英]Flutter + SharedPreferences: how to use FutureBuilder
[英]How use SharedPreferences correctly flutter
我是 flutter 的新手,我想在使用 SharedPreferences 登錄后在本地保存數據。 我創建了一個 class loadUserData() 用於在其他 class 中重用存儲在 SharedPreferences 中的數據。
登錄 class:
Future<User> login(String email, String password) async {
await checkInternet();
Map<String, String> headers = {
'Content-type': 'application/json',
'Accept': 'application/json',
};
Map<String, String> body = {'email': email, 'password': password};
var response = await http.post(Uri.parse(ApiUtil.AUTH_LOGIN),
headers: headers, body: jsonEncode(body));
switch (response.statusCode) {
case 200:
var body = jsonDecode(response.body);
var data = body['user'];
User user = User.fromJson(data);
Track track = Track.fromJson(body);
if (body['code'] == 0) {
SharedPreferences localStorage =
await SharedPreferences.getInstance();
localStorage.setInt('id', body['user']['id']);
localStorage.setString('adress', body['user']['adress']);
localStorage.setString('name', body['user']['name']);
localStorage.setString('phone', body['user']['phone']);
localStorage.setString('access_token', body['access_token']);
}
return user;
case 500:
throw ('Erreur serveur');
break;
case 400:
throw LoginFailed();
default:
throw ('connection timeout');
break;
}
}
我在第二個文件中創建 loadUserData():
loadUserData() async {
SharedPreferences localStorage = await SharedPreferences.getInstance();
var user = jsonDecode(localStorage.getString('user'));
if (user != null) {
setState(() {
name = user['name'];
phone = user['phone'];
adress = user['adress'];
email = user['email'];
});
}
}
但是 loadUserData() 中的姓名、電話、地址和 email 為空。 我怎樣才能正確獲取數據?
問題是您正在設置以下鍵: id
、 address
、 name
、 phone
和access_token
,但您正在嘗試讀取密鑰user
。
此外,您可能需要考慮SecureStorage來存儲 access_token 和其他敏感信息
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