Android 在recyclerview中首先订购最新的firebase数据

我的数据库结构如下

我在recyclerview中显示订单的子项，由于我使用firebase的

推送

生成键，recyclerview中的项目在顶部显示第一个订单，但我的目标正好相反（最近的订单显示在顶部）。希望我清楚

注意：我在recyclerview中使用分页，当前通过

orderbyKey（）显示

我尝试的

Negative和
orderByChild中的时间戳（“时间戳”）
面临的问题：仅显示一个子项（在我的案例中仅显示MZFAKRKPYYYZOSWLLVPA）

mLayoutManager.setStackFromEnd（true）；和mLayoutManager.setReverseLayout（true）；
面临的问题：这不符合目标，因为它不会将最近下的订单显示为第一个


Collections.reverse（myList）在传递到适配器之前，适配器没有任何更改


有没有什么我看不到的，或者我已经试过了，但是没有找到正确的方法？在这一点上有什么帮助吗？已经谢谢了

编辑：我的代码

订单类别代码：

    public class Orders extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_orders);

        //HOOKS
        getHooks();

        final LinearLayoutManager mLayoutManager = new LinearLayoutManager(this);
        mLayoutManager.setStackFromEnd(true);
        mLayoutManager.setReverseLayout(true);
        mRV.setLayoutManager(mLayoutManager);


        ordersRef=FirebaseInit.getDatabase().getReference("USERS/"+phonenumber+"/orders");

        mAdapter = new OrdersAdapter();
        mRV.setAdapter(mAdapter);

        getOrders(null);
        
        mRV.addOnScrollListener(new RecyclerView.OnScrollListener() {

            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);

                mTotalItemCount = mLayoutManager.getItemCount();
                mLastVisibleItemPosition = mLayoutManager.findLastVisibleItemPosition();

                if (!mIsLoading && mTotalItemCount <= (mLastVisibleItemPosition + mPostsPerPage)) {
                    getOrders(mAdapter.getLastItemId());
                    mIsLoading = true;
                }
            }
        });
    }

    private void getHooks() {
        mRV=findViewById(R.id.orders_recyclerview);
    }

    private void getSharedPreferencesData() {
        SharedPreferences sharedPreferences=getSharedPreferences("in.veggiefy.androidapp.userdetails", Context.MODE_PRIVATE);
        phonenumber=sharedPreferences.getString("PHONE",null);
        DEPOT_KEY=sharedPreferences.getString("DEPOTKEY","D_1");
        DC_KEY=sharedPreferences.getString("DCKEY","DC_1");

    }

    private void getOrders(String nodeId) {
        Query query;

        if (nodeId == null)
            query = FirebaseInitNonPersistent.getDatabase().getReference("USERS/"+phonenumber+"/orders")
                    .orderByKey()
                    //.orderByChild("timestamp")
                    .limitToFirst(mPostsPerPage);
        else
            query = FirebaseInitNonPersistent.getDatabase().getReference("USERS/"+phonenumber+"/orders")
                    .orderByKey()
                    //.orderByChild("timestamp")
                    .startAfter(nodeId)
                    .limitToFirst(mPostsPerPage);

        query.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot snapshot) {
                OrdersModel order;
                List<OrdersModel> orderModels = new ArrayList<>();
                
                for (DataSnapshot orderSnapshot : snapshot.getChildren()) {
                    if(orderSnapshot.child("details").exists() && orderSnapshot.child("details").getValue(OrdersModel.class)!=null){
                        
                        orderModels.add(orderSnapshot.child("details").getValue(OrdersModel.class));
                    }
                }
                mAdapter.addAll(orderModels);
                mIsLoading = false;

            }


            @Override
            public void onCancelled(@NonNull DatabaseError error) {

            }
        });

    }

}

是的，代码是必需的，因此我们可以看到并理解是什么产生了这种行为。
    public class OrdersAdapter extends RecyclerView.Adapter<OrdersViewHolder> {

    private List<OrdersModel> order;

    public OrdersAdapter() {
        this.order = new ArrayList<>();
    }

    @Override
    public OrdersViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        return new OrdersViewHolder(LayoutInflater.from(parent.getContext())
                .inflate(R.layout.order_item_layout, parent, false));
    }

    @Override
    public void onBindViewHolder(OrdersViewHolder holder, int position) {
        holder.setData(order.get(position));
    }

    @Override
    public int getItemCount() {
        return order.size();
    }

    public void addAll(List<OrdersModel> newOrders) {
        int initialSize = order.size();
        order.addAll(newOrders);
        notifyItemRangeInserted(initialSize, newOrders.size());
    }

    public String getLastItemId() {
        return order.get(order.size() - 1).getOrderid();

    }

}

public class OrdersViewHolder extends RecyclerView.ViewHolder {

    TextView orderIdText,orderDateText;
    ImageView rightArrowIcon;

    public OrdersViewHolder(@NonNull View itemView) {
        super(itemView);
        findViews(itemView);
    }
    private void findViews(View view) {

        orderIdText=view.findViewById(R.id.order_id_textview);
        orderDateText=view.findViewById(R.id.order_date_textview);
        rightArrowIcon=view.findViewById(R.id.right_arrow_imageView);

    }

    public void setData(OrdersModel ordersModel) {

        orderIdText.setText("ID :"+ordersModel.getOrderid());
        orderDateText.setText(ordersModel.getOrdertime());
        }

    }
}