Error in carousel_slider when restart or reload

Question

I'm using carousel_slider to change between my screen pages as a carousel, but when I click a button to change to another screen I use the method animateToPage from a CarouselController to change to the new screen -> controller.animateToPage(pageIndex)

  void handleButtonClick() {
    if (pageIndex != 1 && pageIndex != 2) {
      goToLogin!.call();
    } else {
      controller.animateToPage(pageIndex);
    }
  }

Every time I run the app it works perfectly, but if a try a hot restart or a hot reload I get the following error when clicking the button

E/flutter ( 5497): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: Null check operator used on a null value E/flutter ( 5497): #0 CarouselControllerImpl.animateToPage (package:carousel_slider/carousel_controller.dart:106:41) E/flutter ( 5497): #1 PresentationButton.handleButtonClick....

Does someone know how to solve this problem?

score 0 · Answer 1 · answered Mar 16 '22 at 06:52

0

check whether pageIndex is null or not.

If it's null, try to initialize with a non null value like int pageIndex = 0

answered Mar 16 '22 at 06:52

Harish

649
5
11

I used pageIndex = 0 and even though the error persisted. The only way I found to stop it was by changing the Stateless class to a Stateful class – Gustavo F. Mar 18 '22 at 15:11

score 0 · Answer 2 · answered Mar 24 '23 at 07:33

I was facing the same issue: my carousel slider was working perfect, but after I updated the state, the controller functions were not longer working.

As @GustavoF mentioned, I solved the problem by declaring the CarouselController in the State of an StatefulWidget, then the build method will use this same controller as the parameter for the CarouselSlider

Error in carousel_slider when restart or reload

2 Answers2