Why I'm getting a null instead of the value of name?-CodePudding

I'm trying to display the name of the user on another page after he/she login. I have no problem displaying the code or message on another page. But when I tried to display the name or the email I got a null value. This is the response of print(data['name']); -> I/flutter ( 4896): null and this is the response of print(data['code']); -> I/flutter ( 4896): 0. I tried to add this ?? '' like this one pageRoute(data['name'] ?? ''); to avoid this error below:

E/flutter ( 4896): [ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: type 'Null' is not a subtype of type 'String'
E/flutter ( 4896): #0      _MyHomePageState.login (package:login/main.dart:99:23)
E/flutter ( 4896): <asynchronous suspension>

I'm still getting a null when the user login. This is the response of the URL if the user enters the correct email and password.

I/flutter ( 4896): 200
I/flutter ( 4896): {"code":0,"message":"success","data":{"Id":121106,"Name":"John",
                    "Email":"[email protected]","Token":"4ca34eb1-0416-43f9-8d3e-19ed51d64288"}}

This is my code below:

Future<void> login() async {
    if(emailController.text.isNotEmpty && passController.text.isNotEmpty) {
      var headers =  {"Content-type": "application/json"};
      var myBody = {
        'email' : emailController.text,
        'password' : passController.text,
      };
      var response = await http.post(Uri.parse("url"),
          headers: headers,
          body: jsonEncode( myBody ));

      final data = jsonDecode(response.body);

      if(response.statusCode == 200 && data['code'] == 0) {
        pageRoute(data['name'] ?? '');
      } else {
        ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text("Invalid Credentials.")));
      }
    } else {
      ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text("Blank Field Not Allowed")));
    }
  }

  void pageRoute(String name) async {
    //here we store value inside shared preferences
    SharedPreferences pref = await SharedPreferences.getInstance();
    await pref.setString("login", name);

    Navigator.push(context, MaterialPageRoute(builder: (context) => const Home()));
  }
}

home.dart

String name= "";
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    getName();
  }

  Future<void> getName() async {
    //here we fetch our credentials from shared pref
    SharedPreferences pref = await SharedPreferences.getInstance();
    setState(() {
      name = pref.getString("login")!;
    });
  }

@override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Center(
          child: ElevatedButton(
            onPressed: () {
              Navigator.pop(context);
            },
            child: SafeArea(
                child: Center(
                    child: Column(
                      children: [
                        Image.asset(
                          'profile_image.jpg', height: 150, width: 150,),
                        const SizedBox(height: 15,),
                        Text("Welcome: $name"), //still null
                        const SizedBox(height: 15,),
                        const Text('Logout'),
                      ],
                    )
                 )
              ),
           ),
        )
     );

CodePudding user response：

change data['name'] to data['data']['Name']

CodePudding user response：

yeah, changing data['name'] to data['data']['Name'] would definitely solve your problem.