我将 userProfileID 和 ,userstype 的值传递给 Profilepage() 如下所示，但是当我转到个人资料页面并尝试打印这两个变量的值时，我将获得 Null 值，我认为它们实际上不是从这个 _HomePageState 传递的，有人帮忙吗？
Here is Where I pass the Value of both
userProfileID as a UserID and userstype as UserTypes inside initState() below,
and both UserID and UserTypes are Obtained from SharedPrefrence
(I call GetData to obtain the value of UserID and UserTypes from SharedPreference )
class _HomePageState extends State<HomePage> {
String UserID;
String UserTypes;
List<Widget>_children;
bool isSignedIn= false;
int _CurrentIndex=0;
void initState(){
super.initState();
GetData();
_children=[
TimeLinePage(UsersIdTimeline:UserID,UsersTypeTimeline:UserTypes),
SearchPage(searchUserSID: UserID,searchUsertype:UserTypes), //search(),
UploadPage(uploadUserSID:UserID,uploadUsertype: UserTypes),
NotificationsPage(NotifyUserSID: UserID,NotifyUsertype:UserTypes),
ProfilePage(userProfileID:UserID,userstype:UserTypes),
];
if(FirebaseAuth.instance.currentUser!=null){
setState(() {
isSignedIn= true;
});
}else{
setState(() {
isSignedIn= false;
});
}
}
@override
Widget build(BuildContext context) {
if(isSignedIn){
return buildHomeScreen();
} else{
return buildSignedInScreen();
}
}
void GetData()async {
SharedPreferences preferences= await SharedPreferences.getInstance();
setState(() {
UserID=preferences.get('UserId');
UserTypes=preferences.get('UserType');
});
}
}
here is buildHomeScreen
class _HomePageState extends State<HomePage> {
// ignore: non_constant_identifier_names
String UserID;
String UserTypes;
List<Widget>_children;
List<Widget>_agentchildren;
bool isSignedIn= false;
// ignore: non_constant_identifier_names
int _CurrentIndex=0;
int _agentCurrentIndex=0;
void initState(){
super.initState();
GetData();
_children=[
TimeLinePage(UsersIdTimeline:UserID,UsersTypeTimeline:UserTypes),
SearchPage(searchUserSID: UserID,searchUsertype:UserTypes),
UploadPage(uploadUserSID:UserID,uploadUsertype:UserTypes),
NotificationsPage(NotifyUserSID: UserID,NotifyUsertype:UserTypes),
ProfilePage(userProfileID:UserID,userstype:UserTypes),
];
if(FirebaseAuth.instance.currentUser!=null){
setState(() {
isSignedIn= true;
});
}else{
setState(() {
isSignedIn= false;
});
}
}
@override
Widget build(BuildContext context) {
if(isSignedIn){
if(UserTypes=='agent'){
return buildagentScreen();
} else if(UserTypes== 'Signupuser'||
UserTypes== 'owner'||
UserTypes== 'seller'
){
return buildHomeScreen();
}else{
return buildSignedInScreen();
}
}
}
这是我的 ProfilePage()，如果我尝试在此页面中获取两者的值 (String userstype; String userProfileID;)，我将获得 Null 值，但我已经从上面的 _HomePageState() 中传递了它们的值
class ProfilePage extends StatefulWidget {
String userstype;
String userProfileID;
ProfilePage({this.userProfileID, this.userstype});
@override
_ProfilePageState createState() => _ProfilePageState();
}
class _ProfilePageState extends State<ProfilePage> {
final String CurrentOnlineUserID=curentuser?.uid;
bool loading =false;
int countPost=0;
String postOrientation="grid";
List<Post> PostList=[];
void initState(){
getAllProfilePost();
}
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.black,
appBar:header(context,strTitle:"profile"),
body:ListView(
children:<Widget>[
TopView(),
]
),
);
}
为您的应用程序全局使用共享首选项。
导入“飞镖：异步”显示未来；导入 'package:shared_preferences/shared_preferences.dart';
class PreferenceUtils {
static Future<SharedPreferences> get _instance async => _prefsInstance ??= await SharedPreferences.getInstance();
static SharedPreferences _prefsInstance;
// call this method from iniState() function of mainApp().
static Future<SharedPreferences> init() async {
_prefsInstance = await _instance;
return _prefsInstance;
}
static String getString(String key, [String defValue]) {
return _prefsInstance.getString(key) ?? defValue ?? "";
}
static Future<bool> setString(String key, String value) async {
var prefs = await _instance;
return prefs?.setString(key, value) ?? Future.value(false);
}
}
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