type 'List<String>' 不是 type 'String' 的子类型？

Question

如何解决这个错误我无法解决还没有人帮助如何修复错误...................... ..................................................... ..................................................... ..................................................... .....................

home.dart
  final List _bannerImage = [];

  getBanner() {
    _service.home.get().then((QuerySnapshot querySnapshot) {
      querySnapshot.docs.forEach((doc) {
        setState(() {
          _bannerImage.add(['image']);
        });
      });
    });
  }

Container(
              height: 140,
              width: MediaQuery.of(context).size.width,
              color: Colors.grey,
              child: PageView.builder(
                itemCount: _bannerImage.length,
                onPageChanged: (val) {
                  setState(() {
                    scrollPosition = val.toDouble();
                  });
                },
                itemBuilder: (BuildContext context, int index) {
                  return CachedNetworkImage(
                    imageUrl: _bannerImage[index],
                    fit: BoxFit.fill,
                    placeholder: (context, url) => GFShimmer(
                      showShimmerEffect: true,
                      mainColor: Colors.grey.shade500,
                      secondaryColor: Colors.grey.shade400,
                      child: Container(
                        height: 140,
                        child: const CircularProgressIndicator(),
                        width: MediaQuery.of(context).size.width,
                        color: Colors.grey,
                      ),
                    ),
                  );

                  //   Image.network(
                  //   _bannerImage[index],
                  //   fit: BoxFit.cover,
                  // );
                },
              ),
            ),

Answer 1

问题出在你添加列表而不是图像url

_bannerImage.add(['image']);

您需要像这样添加图片url

_bannerImage.add(doc['image']);

type 'List<String>' 不是 type 'String' 的子类型？

type 'List<String>' is not a subtype of type 'String'?

listview

dart

flutter