如何使用 firebase 身份验证获取 stream onAuthStateChanged？

Question

I use flutter plugin firebase_auth: ^0.18.4+1

I get this warning in editor:

The function expression type 'String Function(FirebaseUser)' isn't of type 'String Function(User)'. This means its parameter or return type doesn't match what is expected. Consider changing parameter type(s) or the returned type(s).

FirebaseAuth _firebaseAuth = FirebaseAuth.instance;
Stream<String> get onAuthStateChanged =>
      _firebaseAuth.onAuthStateChanged.map((FirebaseUser user) => user?.uid);

Also the 'onAuthStateChanged' is deprecated. How to change it to get stream on onAuthStateChanged?

Answer 1

Change this:

FirebaseAuth _firebaseAuth = FirebaseAuth.instance;
Stream<String> get onAuthStateChanged =>
      _firebaseAuth.onAuthStateChanged.map((FirebaseUser user) => user?.uid);

into this:

FirebaseAuth _firebaseAuth = FirebaseAuth.instance;
Stream<String> get onAuthStateChanged =>
      _firebaseAuth.authStateChanges().map((User user) => user?.uid);

You need to use User class instead of FirebaseUser .