This is the function, I want to retrieve currentUser data.

getData() async {
    User? user = await FirebaseAuth.instance.currentUser;
    print(user?.displayName);
  }

How to display the name on the screen When I call the function in text widget i.e

Text(getData().toString()),

I get the following display Instance of 'Future'<'dynamic'>''

i'm a beginner in Flutter, please help!

CodePudding user response：

Since the function getData is async, it's a Future and you can't use a future methods inside your tree widget directly

you can use it inside your widget tree using the widget FutureBuilder

FutureBuilder(
    future: getData(),
    builder: (context, snapshot){
        if (!snapshot.hasData) return const SizedBox();
        return Text(snapshot.data?.toString() ?? '');
}

also, you have to modify your method to make it return something, Ex.:

getData() async {
    User? user = await FirebaseAuth.instance.currentUser;
    print(user?.displayName);
    return user?.displayName;
}

UPDATE:
to access all the info you want from the User object, let your method return the whole object;

getData() async {
    User? user = await FirebaseAuth.instance.currentUser;
    print(user?.displayName);
    return user;
}

and your FutureBuilder will be

FutureBuilder(
    future: getData(),
    builder: (context, snapshot){
        if (!snapshot.hasData) return const SizedBox();
        if (snapshot.data == null) return const Text('Current user is null');
        return Column(
            children: [
                Text('Name: ${snapshot.data?.displayName}'),
                Text('Email: ${snapshot.data?.email}'),
                ///Add any attribute you want to show..
            ]
        );
}

CodePudding user response：

    getData() async {
        User? user = await FirebaseAuth.instance.currentUser;
if(user!=null){
        print(user.displayName);
        print(user.email);}
      }

this will wait for an async method to first complete then print