Flutter: Call Async methods in stateless widgets

Question

I have a Async method that I want to call in a stateless widget. While running it it says

Future dynamic Is not a sub type of widget

And then it shows the result after some seconds.How can I stop it? This is my method

    var onvalue = await Firestore.instance
        .collection("userdata")
        .document(user.uid)
        .get();
    if (onvalue.exists) {
      return Navigator.pushReplacement(context,
        MaterialPageRoute(builder: (context) => mainhomepage()),);
    }
    else {
      print("register");
      return  Navigator.pushReplacement(context,
        MaterialPageRoute(builder: (context) => Register()),);
    }
 }

And my main body

Widget build(BuildContext context) {
    var user = Provider.of<User>(context);
    //return either home or authenticate
    return MaterialApp (
        home: user != null?check(user)//Calling the function
            :app()
    );
  }

Can you post your code @D. Go.

timilehinjegede
– timilehinjegede

2020-05-12 11:37:02 +00:00
Commented May 12, 2020 at 11:37 — timilehinjegede
– timilehinjegede, Commented May 12, 2020 at 11:37
add code whatever’s you tried.

Viren V Varasadiya
– Viren V Varasadiya

2020-05-12 11:37:17 +00:00
Commented May 12, 2020 at 11:37 — Viren V Varasadiya
– Viren V Varasadiya, Commented May 12, 2020 at 11:37
@T.TSage please check it.

D. Go.
– D. Go.

2020-05-12 11:58:30 +00:00
Commented May 12, 2020 at 11:58 — D. Go.
– D. Go., Commented May 12, 2020 at 11:58
@VirenVVarasadiya please check again

D. Go.
– D. Go.

2020-05-12 11:58:51 +00:00
Commented May 12, 2020 at 11:58 — D. Go.
– D. Go., Commented May 12, 2020 at 11:58

Viren V Varasadiya · Accepted Answer · 2020-05-12 12:03:54Z

6

You can use Futurebuilder.

Widget build(BuildContext context) {
    var user = Provider.of<User>(context);
    //return either home or authenticate
    return MaterialApp (
        home: user != null?
              FutureBuilder(
              future: check(user),
              builder: (_, snapshot) {
                if (snapshot.connectionState == ConnectionState.done) {
                  return Text(snapshot.data);
                } else {
                  return CircularProgressIndicator();
                }
              },
            )
            :app()
          );
      }

answered May 12, 2020 at 12:03

Viren V Varasadiya

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1 Comment

Abdulaziz Alnahhas Over a year ago

That was very useful for me in my provider with Stateless Widget, Thanks

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