Flutter placeholder for CachedNetworkImage

Question

I am using cached_network_image package to display images and have placeholders while being loaded. Below is the error that I have and the widget where I use CachedNetworkImage.

The argument type 'CachedNetworkImage' can't be assigned to the parameter type 'ImageProvider<Object>'

        decoration: BoxDecoration(
          borderRadius: BorderRadius.circular(3),
          image: DecorationImage(
            image: CachedNetworkImage(
              imageUrl: "https://cdn....${item.id}/${item.imageName}.jpg",
              imageBuilder: (context, imageProvider) => Container(
                decoration: BoxDecoration(
                  image: DecorationImage(
                    image: imageProvider,
                    fit: BoxFit.cover,
                  ),
                ),
              ),
              placeholder: (context, url) => CircularProgressIndicator(),
              errorWidget: (context, url, error) => Icon(Icons.error),
            ),
            fit: BoxFit.cover,
          ),
        ),

Searched a bit and I found similar question in this Github thread and an answer that explains that CachedNetworkImage provides a callback that I can use to return image provider. I tried that example but still have that error.

https://github.com/Baseflow/flutter_cached_network_image/issues/177#issuecomment-510359079

I noticed that question in Github thread has The argument type 'CachedNetworkImage' can't be assigned to the parameter type 'ImageProvider'. error, while mine is The argument type 'CachedNetworkImage' can't be assigned to the parameter type 'ImageProvider<Object>'.

Could anyone tell me please what I am doing wrong.

CNI(...,child:Container)

Lang Minh Nguyên
– Lang Minh Nguyên

2021-07-14 17:47:52 +00:00
Commented Jul 14, 2021 at 17:47 — Lang Minh Nguyên
– Lang Minh Nguyên, Commented Jul 14, 2021 at 17:47
when the image loaded it will render widget

Lang Minh Nguyên
– Lang Minh Nguyên

2021-07-14 17:48:44 +00:00
Commented Jul 14, 2021 at 17:48 — Lang Minh Nguyên
– Lang Minh Nguyên, Commented Jul 14, 2021 at 17:48

Lang Minh Nguyên · Accepted Answer · 2021-07-14 17:56:54Z

10

CachedNetworkImage need to wrap outside Widget you want to render

remove

Container(...,
decoration: BoxDecoration(
      borderRadius: BorderRadius.circular(3),
      image: DecorationImage(
        image:

keep

CachedNetworkImage(
          imageUrl: "https://cdn....${item.id}/${item.imageName}.jpg",
          imageBuilder: (context, imageProvider) => Container(
            decoration: BoxDecoration(
              image: DecorationImage(
                image: imageProvider,
                fit: BoxFit.cover,
              ),
            ),
          ),
          placeholder: (context, url) => CircularProgressIndicator(),
          errorWidget: (context, url, error) => Icon(Icons.error),
        ),
        fit: BoxFit.cover,
      ),

Because argument type 'CachedNetworkImage' can't be assigned to the parameter imageis type 'ImageProvider' in Container

answered Jul 14, 2021 at 17:56

Lang Minh Nguyên

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1 Comment

krishnaacharyaa Over a year ago

But what if the requirement is such that i need to display cachedImage inside decoration. Because the child of container needs to have another widget

Chris Pi · Accepted Answer · 2023-04-24 13:01:15Z

Use CachedNetworkImageProvider() when you want it inside a Decoration Image

DecorationImage(
             image: CachedNetworkImageProvider(
                    Assets.image1,
                    errorListener: () {
                      const Text(
                        'Loading',
                        style: TextStyle(
                          color: AppColors.greyDeepColor,
                          fontSize: 20,
                        ),
                      );
                    },
                  )),

If you want to use it as a stand alone widget and not inside a decoration image , thats when you will use CachedNetworkImage().

CachedNetworkImage(
                    imageUrl: Assets.image2`enter code here`,
                    progressIndicatorBuilder:
                        (context, url, downloadProgress) => const Center(
                      child: Text(
                        'Loading',
                        style: TextStyle(
                          color: AppColors.greyDeepColor,
                          fontSize: 10,
                        ),
                      ),
                    ),
                    errorWidget: (context, url, error) => const Center(
                      child: Icon(
                        Icons.error,
                        color: AppColors.blueColor,
                        size: 30,
                      ),
                    ),
                  ),

Rohit Sainik · Accepted Answer · 2021-07-14 17:58:35Z

1

don't use cached_network_image inside decoration image instead use it directly or as a child of the container and you can customize your image inside the image builder property of cached_network_image.

Reason: cached_network_image is not a type of Imageprovider widget.

answered Jul 14, 2021 at 17:58

Rohit Sainik

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