从Firebase FireStore获取数据后更新安卓ArrayList

FirebaseFirestore db = FirebaseFirestore.getInstance();

CollectionReference usersRef = db.collection("users");

usersRef.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
    @Override
    public void onComplete(@NonNull Task<QuerySnapshot> task) {
        if (task.isSuccessful()) {
            ArrayList<String> arrayList = new ArrayList<>();
            for (QueryDocumentSnapshot document : task.getResult()) {
                // 从文档中获取数据并添加到ArrayList中
                String data = document.getString("data");
                arrayList.add(data);
            }
            // 在这里可以对ArrayList进行进一步处理或更新UI
        } else {
            Log.d(TAG, "Error getting documents: ", task.getException());
        }
    }
});