从 Future 返回 object<list> 在 Flutter</list>

Question

I'm struggle on parsing Future to object. I want to retrieve the User data from Future<List<User>> to User object. I can get the User data, but its still inside Future .

Future<List<User>> getDataUser(String name_,int id_) async{
    var datajson=await Network.getData("https://jsonplaceholder.typicode.com/users?username=$name_&id=$id_");
    final response=jsonDecode(datajson);
    List<User> fuser=response.map((r)=>User.fromJson(r)).toList();
    User user_=fuser.single;
    print('response: '+user_.name);
    return fuser;
}

EDIT: Network.getData is a Future<dynamic>

When I call activeUser() , I want it to return an object ( User ).

User activeUser(Future<List<User>> fuser){
    List<User> user=fuser as List<User>;
    print('user: '+user.single.username);
    return user.single;
}

I always get this kind of error: type 'Future<List<User>>' is not a subtype of type 'List<User>' I'm avoiding using builder ( FutureBuilder or ListView.Builder or else) because I'm not going to make a list. It just a single map. I want that Future<List<User>> is returning a User object. The REST API I use, returning a list, not an object

[
  {
    "id": 1,
    "name": "Leanne Graham",
    "username": "Bret",
    "email": "Sincere@april.biz",
    "address": {
      "street": "Kulas Light",
      "suite": "Apt. 556",
      "city": "Gwenborough",
      "zipcode": "92998-3874",
      "geo": {
        "lat": "-37.3159",
        "lng": "81.1496"
      }
    },
    "phone": "1-770-736-8031 x56442",
    "website": "hildegard.org",
    "company": {
      "name": "Romaguera-Crona",
      "catchPhrase": "Multi-layered client-server neural-net",
      "bs": "harness real-time e-markets"
    }
  }
]

• Notice the rectangle bracket, its a list with one json map.

Answer 1

Try this:

var fName;
...

getDataUser(name, id).then((fuser){
    print('user: '+ fuser.single.username);
    this.fName = fuser.single;});

Answer 2

I've figured it out.

I created a class ListUser to store the list that returned from a Future

class ListUser{
  final List<User> oneuser;

  DaftarUser({this.oneuser});

  factory ListUser.fromJson(List<dynamic> jsonuser){
    List userone=new List();
    userone=jsonuser.map((p)=>User.fromJson(p)).toList();

    return new ListUser(
      oneuser:userone
    );
  }
}

Then I call the class above to Future<List<User>>

Future<List<User>> getDataUser(String name_,int id_) async{
    var datajson=await Network.getData("https://jsonplaceholder.typicode.com/users?username=$name_&id=$id_");
    final response=jsonDecode(datajson);
    List<User> fuser=ListUser.fromJson(datajson).oneuser;
    // User user_=fuser.single;
    // print('response: '+user_.name);
    // those two line above are for seeing the value only, not too important
    return fuser;
}

The Function above will return a List<User> , so that I can change the activeUser function, like this:

User activeUser(List<User> fuser){
    User u=fuser.single;
    return u;
}

Now I can call that activeUser anywhere I need it.

BTW, thanks for the help above. Cheers