#i 使用共享首選項保存了我的所有用戶資料以執行自動登錄，并且運行良好資料已保存
token = responseData['token'];
userEmail = responseData['user_email'];
userNicename = responseData['user_nicename'];
userDisplayName = responseData['user_display_name'];
userAddress = responseData['user_address'];
userContact = responseData['user_contact'];
userId = responseData['user_id'];
userDisplayUrl = responseData['user_display_url'];
notifyListeners();
SharedPreferences prefs = await SharedPreferences.getInstance();
final userData = jsonEncode({'token':token,'user_email':userEmail,'user_nicename':userNicename,'user_display_name':userDisplayName,'user_address':userAddress,'user_contact':userContact,'user_id':userId,'user_display_url':userDisplayUrl});
prefs.setString('userData',userData);
#資料就是這樣保存的
{"token":"eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJodHRwczpcL1wvc3dlZXQtYXJkaW5naGVsbGkuMy0xMDgtMTM4LTIwNi5wbGVzay5wYWdlIiwiaWF0IjoxNjQyMzMwNzQyLCJuYmYiOjE2NDIzMzA3NDIsImV4cCI6MTY0MjkzNTU0MiwiZGF0YSI6eyJ1c2VyIjp7ImlkIjoiMjgifX19.2jZEu-QNL3UxRiFSgVE728bF_cl_CZd0VJLT1f5HfCc","user_email":"[email protected]","user_nicename":"sauravadhikari404","user_display_name":"SauravAdhikari404","user_address":null,"user_contact":null,"user_id":"28","user_display_url":""}
#現在我想訪問單個資料，就像我想只獲取那個 user_id 或只獲取 user_email 但我不知道該怎么做我試過這樣
String? userData;
@override
void initState(){
// TODO: implement initState
getUserId();
super.initState();
}
void getUserId()async{
SharedPreferences prefs = await SharedPreferences.getInstance();
setState(() {
userData = prefs.getString("userData");
print(userData);
});
}
#正如我上面提到的，我的所有資料都在 userData 中，但現在我只想獲取我的 user_id 或 user_email 但我無法
uj5u.com熱心網友回復：
使用 jsonDecode 將其轉換為 Map：
像這樣：
setState(() {
var userId = jsonDecode(prefs.getString("userData"))["user_id"];
print(userId);
});
處理null此案：
String? userDataString = prefs.getString("userData");
if(userDataString != null){
var userId = jsonDecode(userDataString)["user_id"];
var email = jsonDecode(userDataString)["user_email"];
}
轉載請註明出處，本文鏈接：https://www.uj5u.com/caozuo/412701.html
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