问题
I have a project that loads a list from the server. This data will eventually be stored into a database, but for now is stored in memory in a MutableLiveData. A RecyclerView's adapter is watching the data and displaying it. So far everything is working as expected, using a FAB the user can post a new entry which will go at the top of the list, on success I get a 200 and here's the main part where I'm getting lost...
When I want to add a single item to a list stored in a LiveData, the observer is unaware of the delta. I currently make a call to RecyclerView.Adapter.notifyDataSetChanged(), though the ideal in my case would be to call notifyItemInserted(0) or in other cases I can see various other notifications. What the best way to do this? The lifecycle architecture library appears to be very well thought of, I assume I'm missing something simple. I can't imagine having to manually perform a diff between the lists?
来源：https://stackoverflow.com/questions/46585733/how-to-properly-use-livedata-with-recycleview