如何在 flutter 中的另一个异步 function 中调用一个异步 function

Question

I have two future functions one for verifying OTP with API and another for setting a password using the API.

When the OTP verification is successful the set password API must be called. How can I do that?

My code is:

    () async {

var status = await registrationService.verifyOtp(registrationData.mobileNumber,otpController.text);
                                if(status == 'approved'){
                                  print('success');
                                      () async {
                                    var passwordStatus = await registrationService.setPassword(registrationData.name, registrationData.number, passController.text);
                                    if(passwordStatus == 'approved'){
                                      print('approved');
                                      Navigator.pushNamed(context, StudMainPage.id);
                                    }
                                    else{
                                      WidgetsBinding.instance.addPostFrameCallback((timeStamp) => _showNewVersionAvailableDialog(context));
                                    }
                                  };
                                 }

    }

It shows error or the function is not being called. What should I do now? Thanks in advance.

Answer 1

Use then Callback

registrationService.verifyOtp(registrationData.mobileNumber,otpController.text).then((status) {

if(status == 'approved'){
   print('success');

registrationService.setPassword(registrationData.name, registrationData.number, passController.text).then((response) {

//....
})))

}

Answer 2

Create a second async function for

Future<PasswordStatus> getPasswordStatus() async {
await registrationService.setPassword(registrationData.name, registrationData.number, passController.text);
}

and call that function as;

if(status == 'approved'){
   var passwordStatus = await getPasswordStatus();
}

then just use the passwordStatus value.