notifyItemInserted再次呈现整个列表

Question

我有以下方法-

  private fun initRoomObserving() {
        dashboardViewModel = ViewModelProvider(this).get(DashboardViewModel::class.java)
        dashboardViewModel.getAllMessagesEntities().observe(this, Observer { receivedMessageList ->
            receivedMessageList.forEach {
                if (!userPhoneNumber.equals(it.senderUsername)) {
                    it.isReceiver = true
                }
                if (!messagesList.contains(it)) {
                    messagesList.add(it)
                }
            }
            conversationAdapter.notifyItemInserted(messagesList.size)
            conversationAdapter.notifyItemRangeChanged(messagesList.size - 1,messagesList.size)

        })
    }

由于某种原因，每次添加新实体时，整个列表都会再次呈现，即使我明确地是notifyItemInserted而不是notifyDataSetChanged

为什么会这样，我想念什么？

Answer 1