Scroll Controller is not listening to scroll in Flutter

Question

Im trying to listen to scroll for lazy loading but im not getting any Listen values,I have used ListView.builder widget and have attached a scroll contoller (_controller) and have instantiated controller in initState() method, need help with the issue

class _FeedsState extends State<Feeds> {
  ScrollController _controller;
  int pageNumber = 1;

  @override
  void initState() {
    super.initState();
    _controller = new ScrollController();
    _controller.addListener(scrollListener);

    SchedulerBinding.instance.addPostFrameCallback((_) {
      _controller.animateTo(
        0.0,
        duration: const Duration(milliseconds: 10),
        curve: Curves.easeOut,
      );
    });
  }

  @override
  Widget build(BuildContext context) {
    print(widget.feedDetails);
    return widget.feedDetails.length == 0
        ? PostSomething(
            isAdmin: widget.isAdmin,
          )
        : ListView.builder(
            shrinkWrap: true,
            controller: _controller,
            itemBuilder: (context, index) {
              return Column(
                children: [
                  index == 0
                      ? PostSomething(
                          isAdmin: widget.isAdmin,
                          profilePic: widget.feedDetails[0]["profile_pic"])
                      : Container(),
                  (Posts(
                    index: index,
                    feedDetails: widget.feedDetails[index],
                    displayProfileNavigation: widget.displayProfileNavigation,
                  )),
                ],
              );
            },
            itemCount: widget.feedDetails.length,
          );
  }

  void scrollListener() {
    print("Scrolling");
    if (_controller.position.pixels == _controller.position.maxScrollExtent) {
      print("Coooool");
    }
  }
}

shorol · Accepted Answer · 2021-01-14 11:44:12Z

5

make: shrinkWrap: false,, this will enable your scrolling,

if this show unbounded height exception, then try

return Scaffold(
        body: Expanded(
        ListView.builder(....your code..

edited Jan 14, 2021 at 11:44

answered Jan 14, 2021 at 11:04

shorol

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8 Comments

Swaroop Sambhayya Over a year ago

its showing unbounded height exception eventhough i add Scaffold as parent

Usman Akhlaq Over a year ago

put your ListView.builder into the Expanded widget. It will solve the unbounded height exception.

shorol Over a year ago

can you please check by removing PostSomething widgets, just your scrolling and scroll listener is working or not?

shorol Over a year ago

if it works, then your PostSomething() widget need to be wrap in expanded widget.

Swaroop Sambhayya Over a year ago

Problem Solved!shrinkWrap=false and Expanded/Flexible solves problem,Thank you

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