I dont know why the Snackbar doesnt show up.But when I delete the function off the firebaseauth it shows the snackbar.

Code:

MaterialButton(
              onPressed: (){
                try{
                  FirebaseAuth.instance.createUserWithEmailAndPassword(
                      email: emailController.text, password: passwordController.text).then((signedUser) {
                    userCollection.doc(signedUser.user?.uid).set({
                      'username': usernameController.text,
                      'email': emailController.text,
                      'password': passwordController.text,
                      'uid': signedUser.user?.uid,
                    });
                    Navigator.of(context).pushReplacement(MaterialPageRoute(builder: (_) => HomeScreen()));
                  });
                } catch(e) {
                  print(e.toString());
                  var snackbar = SnackBar(content: Text(e.toString()));
                  ScaffoldMessenger.of(context).showSnackBar(snackbar);
                }
              },
              elevation: 0,
              minWidth: MediaQuery.of(context).size.width,
              height: 40.h,
              child: Text("Buat akun"),
              textColor: Colors.white,
              color: Colors.blue,
            )

CodePudding user response：

you are using then so the error won't be caught in the catch section.

You should remove the try catch block and catch the error with catchError() instead like this:

FirebaseAuth.instance.createUserWithEmailAndPassword(
                      email: emailController.text, password: passwordController.text).then((signedUser) {
                    userCollection.doc(signedUser.user?.uid).set({
                      'username': usernameController.text,
                      'email': emailController.text,
                      'password': passwordController.text,
                      'uid': signedUser.user?.uid,
                    });
                    Navigator.of(context).pushReplacement(MaterialPageRoute(builder: (_) => HomeScreen()));
                  }).catchError((e) {
                    print(e.toString());
                    var snackbar = SnackBar(content: Text(e.toString()));
                    ScaffoldMessenger.of(context).showSnackBar(snackbar);
                  });