The RecyclerView scrolls to downward when a new message is added-CodePudding

I have a chat app. I used RecyclerView and I set stackFromEnd true and reverseLayout false to LinearlayoutManager. when a new message is added at the bottom I mean at the end of the list the recyclerView starts auto scroll downward instead of upward. the adapter is notified by notifyItemInserted().

Expected Behaviour: When a new message is added to the list it should scroll to the bottom or upward. Any help is appreciated. Thanks

CodePudding user response：

Let's suppose your adapter is populated by objects called messages and you have a source of data called messageList (could be a Collection, etc) that is passed to your adapter. You could do something like this:

        int position = messageList.size() > 0 ? (messageList.size()-1) : 0;
        mRecyclerView.smoothScrollToPosition(position);

Just ensure your adapter is not null and actually gets data from messageList since this is in your Activity/Fragment class and not in the adapter class.

CodePudding user response：

You can scrolldown progrmatically using code below

recyclerView.scrollToPosition(chatList.size() - 1);

You can also try another solution if above one doesn't works

setStackFromEnd(true) or setReverseLayout(true)