當我從 firebase 實時數據庫獲取數據時，它會自動按升序列出，但我試圖讓我放入 arraylist 的值以相反的順序而不是升序列出。使用 listview 時是否可以對值進行相反的排序？目前使用的代碼是：    Query query = userRef.orderByChild("totalNumberOfSteps");    ValueEventListener valueEventListener = new ValueEventListener() {        @Override        public void onDataChange(DataSnapshot dataSnapshot) {            for (DataSnapshot ds : dataSnapshot.getChildren()) {                String username = ds.child("username").getValue(String.class);                long totalNumberOfSteps = ds.child("totalNumberOfSteps").getValue(Long.class);                Log.d(TAG , username + " - Steps: " + totalNumberOfSteps);                arrayList.add(new String(username + "  -  " + "steps:  " + totalNumberOfSteps));                arrayAdapter = new ArrayAdapter<>(Leaderboard.this , android.R.layout.simple_list_item_1 , arrayList);                listView.setAdapter(arrayAdapter);            }        }        @Override        public void onCancelled(@NonNull DatabaseError databaseError) {            Log.d(TAG , databaseError.getMessage()); //Don't ignore errors!        }    };    query.addListenerForSingleValueEvent(valueEventListener);}}此代碼的當前輸出是：John Doe VI - Steps: 0John Doe III - Steps: 0John Doe V - Steps: 12John Doe I - Steps: 79John Doe IV - Steps: 88John Doe II - Steps: 111首選輸出：John Doe II - Steps: 111John Doe IV - Steps: 88John Doe I - Steps: 79John Doe V - Steps: 12John Doe III - Steps: 0John Doe VI - Steps: 0添加Collections.reverse(arrayList);到代碼時，輸出為：John Doe II - Steps: 111John Doe IV - Steps: 88John Doe III - Steps: 0John Doe VI - Steps: 0John Doe V - Steps: 12John Doe I - Steps: 79