Carousel Builder from Future Builder and Firebase Flutter

You can edit other like slide padding and others as per design

  var _dataLength = 1;
  var _index;
  var slides;
  @override
  void initState() {
    getSliderImageFirebase();
    super.initState();
  }

  Future getSliderImageFromDB() async {
    var _fireStore = FirebaseFirestore.instance;
    QuerySnapshot snapshot = await _fireStore.collection('slider').get();
    if (mounted) {
      setState(() {
        _dataLength = snapshot.docs.length;
      });
    }
    return snapshot.docs;
  }
  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        FutureBuilder(
          future: getSliderImageFirebase(),
          builder: (context, AsyncSnapshot snap) {
            List slideList = snap.data.toList();
            return CarouselSlider.builder(
              itemCount: slideList.length,
              itemBuilder: (context, index, page) {
                return Image.network(
                  slideList[index]['image'],
                  fit: BoxFit.fill,
                  width: MediaQuery.of(context).size.width * 0.9,
                );
              },
              carouselController: buttonCarouselController,
              options: CarouselOptions(
                initialPage: 0,
                autoPlay: true,
                height: 150,
                onPageChanged: (index, reason) {
                  setState(() {
                    _index = index;
                  });
                },
              ),
            );
          },
        ),
        DotsIndicator(
          dotsCount: _dataLength,
          position: _index.toDouble(),
          decorator: DotsDecorator(
            size: const Size.square(9.0),
            activeColor: Theme.of(context).primaryColor,
            activeSize: const Size(18.0, 9.0),
            activeShape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(5.0)),
          ),
        ),
      ],
    );
  }

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