DART

flutter scroll to end of list

// If you know the height for each widget or the height is fixed.
  
  void _scrollToLatestItem(int latestIndex) {
    _controller.animateTo(
      latestIndex * _widgetHeight,
      duration: Duration(milliseconds: 300),
      curve: Curves.easeInCubic,
    );
  }

flutter scroll to end of list

// There is no other way to scroll to the end of a lazy listView and
// unknown height for each widget (the height is not fixed) in the list.

// If you know the height for each widget or the height is fixed 
// DO NOT use this code!

  Future<void> _scrollToLatestMessage() async {
    await Future.delayed(const Duration(milliseconds: 50));

    if (chatScrollController.position.pixels <
        chatScrollController.position.maxScrollExtent) {
      await chatScrollController.animateTo(
        chatScrollController.position.maxScrollExtent,
        duration: const Duration(milliseconds: 250),
        curve: Curves.easeInCubic,
      );
      await _scrollToLatestMessage();
    }
  }