为什么从Firebase不能使Uid正常工作？

Question

Java：

if (resultCode == RESULT_OK) {
                FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
                userName = Objects.requireNonNull(user).getDisplayName();
                profileNameEdit.setText(userName);
                userEmail = user.getEmail();
                profileEmailEdit.setText(userEmail);
                String userID = user.getUid();

除了user.getUid()之外，一切都OK。该请求仅返回任何内容（不为null，简单为空）。

如何获取用户ID？

Answer 1

Hmmm ...字符串userID为空，然后将其从文本输入到TextView。关闭答案。

Answer 2

尝试执行此操作：

FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
   if (user != null) {
         // User is signed in
         userName = user.getDisplayName();
         profileNameEdit.setText(userName);
         userEmail = user.getEmail();
         profileEmailEdit.setText(userEmail);
         String mUid = user.getUid();
         //Set text here not only get the Uid                                                
}
else {
         Toast.makeText(ListActivity.this, "No user logged in", Toast.LENGTH_SHORT).show();
}

如果它不起作用，请尝试让Uid这样做：

String mUid=FirebaseDatabase.getInstance().getReference().child("Users")
                          .child(user.getUid());

或

String mUid=FirebaseDatabase.getInstance().getReference().child("Users")
                              .child(FirebaseAuth.getInstance()getCurrentUser().getUid());