wait for an action to complete and do another in dart

[ABEROR NORBERT]

I have written a function that I use to sign in user with email and password. I want to push the user to two diffirent pages with a button press if the firebase user uid returns null or not.I think the problem is that by the time the page is pushed the user uid is always null. I want to wait until the signInWithEmailAndPassword() method completes. what should I do

 something like:

 firstFunction(

//this communicates with firebase authentication and returns the uid

)

secondFunction(

if(uid){ /*do something*/}

else{}

)

//buh I want `firstFunction()` to finish executing and give me back results before `secondFunction() `executes. so the second should execute only //after the first has executed

here is my code

Future<FirebaseUser> signInUser([var myuserdata,var mypasswrd

,frouter,srouter]

)async{

FirebaseUser firebaseUser = await FirebaseAuth.instance

.signInWithEmailAndPassword(email:myuserdata,password:mypasswrd).then((onValue){

if(onValue.uid != null){

print('object at non-null uid ${onValue.uid}');

frouter;

//frouter is my homepage;;

}

if(onValue.uid == null){

srouter;

print('object at null uid ${onValue.uid}');

//srouter is my error page;

}

});

print('user id :${firebaseUser.uid}');

return firebaseUser;

}

// it always push me to the error page //how do I make this work

[bre...@tamu.edu]

You'll want to look into the Future API for handling things like this. As a very basic example:

Future getUIDFromDB = _db.getUID();

getUIDFromDB.then((returnData) {
    if (returnData != null) {
        // push to one screen
    }
    else {
        // push to another screen
    }
});