Android应用程序不会写入Firebase实时数据库

{
  "rules": {
    ".read": "auth != null",
    ".write": "auth != null"
  }
}

FirebaseAuth mAuth = FirebaseAuth.getInstance();
mAuth.signInWithEmailAndPassword(email, password)
    .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {
            if (task.isSuccessful()) {
                // 用户登录成功，可以进行数据库操作
            } else {
                // 登录失败，处理错误
            }
        }
    });

DatabaseReference ref = FirebaseDatabase.getInstance().getReference("users");
ref.child(userId).setValue(userObject)
    .addOnSuccessListener(new OnSuccessListener<Void>() {
        @Override
        public void onSuccess(Void aVoid) {
            // 数据写入成功
        }
    })
    .addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception e) {
            // 数据写入失败，处理错误
        }
    });

FirebaseApp.initializeApp(this);