Flutter initstate navigator is not working

Question

I am using initState and having Navigator issue:

I/flutter ( 5726): The following assertion was thrown building Builder: I/flutter ( 5726): setState() or markNeedsBuild() called during build.

My Code:

@override
void initState() {

super.initState();
print(globals.isLoggedIn);
if(globals.isLoggedIn) {

    print("Already login");

    Navigator.push(context, MaterialPageRoute(builder: (context)=> Dashboard()));

}

Answer 1

We are getting the error as while building the Widget itself we are asking to navigate.

There is a work around for this.

Future(() {
   Navigator.push(context, MaterialPageRoute(builder: (context)=> Dashboard()));
});

Explaination:

As Dart is based on single-threaded event loop, when we create an async tasks, it will put those events in the end of the event queue and continue it's current execution. Please refer below example for more details,

void main() {
  print("first");
  Future(() => print("second"));
  print("third");
  Future(() => print("forth"));
}

Output will be

first
third
second
forth

Answer 2

Embedding the 'MyApp' inside the MaterialApp widget has solved the problem for me.

void main() {
runApp(MaterialApp(
home:MyApp()
));
}