内部类中的分配值未正确分配

Question

我具有此功能来返回Firestore端点处的节点数，但似乎无法正常运行。当前，端点处的节点数为1。这里是函数

public static int getInvoicesCount(String uid)
{
    final int[] count = new int[1];

    FirebaseFirestore firestore;
    firestore = FirebaseFirestore.getInstance();

    CollectionReference invoicesRef = firestore
            .collection("invoices");

    Query query = invoicesRef.whereEqualTo("creator_id",uid);

    Task<QuerySnapshot> task = query.get();


    task.addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
        @Override
        public void onComplete(@NonNull Task<QuerySnapshot> task) {
            if(task.isSuccessful())
            {
                if(task.getResult().isEmpty())
                {
                    count[0] = 0;
                    Log.d("counter",String.valueOf(count[0]));
                }
                else {
                    Log.d("counter is",String.valueOf(task.getResult().size()));
                    count[0] = task.getResult().size();
                }

            }
        }
    });

    return count[0];

}

在else语句中记录count [0]的值将给出1，但是函数末尾的返回值仍然是0而不是1；