java - 在 Firestore 中找不到文档数据，返回 null

Question

我似乎无法将文本放入 TextView。数据来自 Firestore 数据库。当我运行它时，TextView 是空白的并返回一个空值。以下是我到目前为止所做的。有人可以看看吗？你可以在这里看到我的数据库结构：[数据库结构图][1]

public class ProfileFragment extends Fragment {

    TextView firstNameText, age;
    private FirebaseAuth mAuth = FirebaseAuth.getInstance();
    private FirebaseFirestore db = FirebaseFirestore.getInstance();
    private FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_profile, container, false);
        firstNameText = rootView.findViewById(R.id.profile_firstName);
        age = rootView.findViewById(R.id.profile_age);
        getUserInfo();

        return rootView;

    }

    public void getUserInfo() {
        db.collection("Users").document(mAuth.getCurrentUser().getEmail()).get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
            @Override
            public void onComplete(@NonNull Task<DocumentSnapshot> task) {
                if (task.isSuccessful()) {

                    DocumentSnapshot documentSnapshot = task.getResult();
                    String firstName = documentSnapshot.getString("Firstname");
                    Log.d(TAG, "Printing docData: " + documentSnapshot.getData());
                    firstNameText.setText(firstName);

                }
            }
        });
    }
}

标签： javaandroidfirebaseandroid-fragmentsgoogle-cloud-firestore

Answer 1

我猜想

mAuth.getCurrentUser().getEmail()

是这里的问题。尝试将用户的电子邮件放在字符串中

mAuth = FirebaseAuth.getInstance();
     final FirebaseUser theUser = mAuth.getCurrentUser();
     if (theUser !=null)
     String UID = theUser.getEmail().toString();

并更换

 mAuth.getCurrentUser().getEmail()

与 UID 。