SetState and Shared Preferences returning null

user_14201740 0
Viewed 39

I am having trouble identifying as to why setState() is returning null on my shared preferences getString method. I am calling an async function outside of the initState and the constantly printing null when i check the return string of getString on page load. I have checked that setString is saving the correct string to the key. Here is my code:

       void initState() {
        super.initState();
        retrieve();
   
      }

       retrieve() async {
       final prefs = await SharedPreferences.getInstance();
       setState(() {
        name = prefs.getString("displayName");

        print(name);
       });
     }

Here is where I setString(in the register user page):

          try {
            UserCredential result =
                await FirebaseAuth.instance.createUserWithEmailAndPassword(
              email: _emailController.text,
              password: _passwordController.text,
            );
            final user = FirebaseAuth.instance.currentUser;
            final name = _usernameController.text;
            // if (user != null) {
            await user?.updateDisplayName(name);
            Navigator.pushNamed(context, homeRoute);

            print(name);
setstate dart flutter sharedpreferences null
3 Answers

You should set ,username via shared preference before accessing it.

final prefs = await SharedPreferences.getInstance();

In register page.(where you want to set name via SharedPreference before accessing it)

await prefs.setString('displayName', 'name');

After setting it in registeration you can access like above

name = prefs.getString("displayName");
user_78900410

When SharedPreferences return null value it means you have not set value with your key yet. So firstly set something like this:

final prefs = await SharedPreferences.getInstance().reload();

await prefs.setString('displayName', 'Mark');

then try to call it.

user_103069970

Thanks to all who have spent the time to respond to help. I hope this answer might help some one else down the track. I found that Shared Preferences was not saving the data - my code was fine after all. I simply just closed the app and restarted the X code build from scratch and it is now working.....

user_142017400
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