Firebase身份验证的用户ID的字符串值以记录Firestore [重复]

Question

你能帮助我的 Android 项目吗？我正在尝试在 firebase auth 中获取 currentUID，我希望它在我的 firestore 文档中显示字符串值。

db2.collection("Assessment").document(??).set(answer);

Answer 1

当前登录用户的ID可以通过FirebaseUser实例的getUid方法获取，可以通过FirebaseAuth#getCurrentUser获取：

Java：

FirebaseAuth auth = FirebaseAuth.getInstance();
FirebaseUser user = auth.getCurrentUser();
String uid = user.getUid();
// Or alternatively, a one-liner (although the code complexity is higher)
String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();

科特林：

val auth = FirebaseAuth.getInstance()
val user = auth.currentUser // Note: This returns a nullable class
val uid = user?.uid
// Or alternatively, a one-liner (although the code complexity is higher)
val uid = FirebaseAuth.getInstance().currentUser?.uid