是否可以在Firebase Firestore document.How中找到字段的数量在Android Studio中可以

FirebaseFirestore db = FirebaseFirestore.getInstance();
DocumentReference docRef = db.collection("your_collection").document("your_document");

docRef.get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
    @Override
    public void onComplete(@NonNull Task<DocumentSnapshot> task) {
        if (task.isSuccessful()) {
            DocumentSnapshot document = task.getResult();
            if (document.exists()) {
                Map<String, Object> data = document.getData();
                int fieldCount = data.size();
                // 输出字段数量
                Log.d("Field Count", "Field count: " + fieldCount);
            } else {
                Log.d("Document", "Document does not exist");
            }
        } else {
            Log.d("Error", "Error getting document: " + task.getException());
        }
    }
});