问回收站:向下滚动

EN

public class ChatAdapter extends RecyclerView.Adapter<ChatAdapter.ViewHolder> {

    public static boolean bottomReached = false;

      @Override //Make sure it happens on bindViewHolder or related...
        public void onBindViewHolder(final ViewHolder holder, int position) {
                if (position == data.size() - 1)
                    bottomReached = true;
                else
                    bottomReached = false;

        }

}

public class ChatActivity extends AppCompatActivity{
ChatAdapter chatAdapter;

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_chat);

        chatAdapter = new ChatAdapter(this, messagesDataSample);
}

private void gotNewMessage(){
   if(chatAdapter.bottomReached)
      recyclerView.scrollToPosition(adapter.getItemCount() - 1);
   else
      // else is not necessary as you don't want to do anything.
}

}