Firebase不支持多个 orderbychild 方法.您可以做的是，首先使用当前用户ID

Firebase does not support multiple orderbychild method. What you can do is, first fetch records from Firebase with current user id

Query Users = FirebaseDatabase.getInstance.getReference.child("Users").orderbychild("CurrentUserId");

然后在客户端进行时间戳排序.

Then do timestamp sorting at client end.