Flutter firebase authentication error crashing my app - flutter

Question

signInsignUpButtons(context, true, () {
try {
FirebaseAuth.instance
.signInWithEmailAndPassword(
email: _emailTextController.text,
password: _passwordTextController.text)
.then((value) {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => homescreenPage(),
));
});
} on FirebaseAuthException catch (error) {
print(error.message);
Fluttertoast.showToast(
msg: error.message.toString(), gravity: ToastGravity.TOP);
}
// using firebase api checks whether email and password is correct registered
}),
I'm trying to show authentication errors from firebase such as incorrect password/email (when the user presses the sign in button). Instead of printing the error and displaying a pop up message on the app, it just freezes.
Ive tried using this line which is without fluttertoast
FirebaseAuth.instance
.signInWithEmailAndPassword(
email: _emailTextController.text,
password: _passwordTextController.text)
.then((value) {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => homescreenPage(),
)).onError((error, stackTrace) {
print("Error ${error.tostring()}");
})
})
But then again, it just doesn't print the error and my app freezes.
Im using these dependancies:
dependencies:
flutter:
sdk: flutter
cupertino_icons: ^1.0.2
firebase_core: ^2.4.1
firebase_auth: ^4.2.5
fluttertoast: ^8.1.2

Answer 1

Since signInWithEmailAndPassword is a future, you should use an async function and await in the try-catch block. Something like this should work:
void _signIn() async {
try {
await FirebaseAuth.instance.signInWithEmailAndPassword(
email: <email>,
password: <password>,
);
} on FirebaseAuthException catch (e) {
// catch FirebaseAuthException errors here
} catch (e) {
// catch other exceptions, for example no network
}
}