Re: Check if URL is an image in Flutter

[Eric Seidel]

You might want https://github.com/flutter/flutter/issues/14089 ?

On Sun, Jun 10, 2018 at 11:42 AM leo nx <leo.d...@gmail.com> wrote:

I want to check if a URL returns a valid image and if it doesn't I want to show a different image. I used CachedNetworkImage, but it didn't work.

The problem is that if the image does not exist on the website, it redirects you to one of these 'Site not found', and i think that confuses the CachedNetworkImage, so the errorWidget is not displayed.

What i want the code to do is check if the first url works, and if not display the list view with the other 2 images.

Error in console:

    E/flutter ( 4808): [ERROR:flutter/lib/ui/painting/codec.cc(89)] Failed decoding image. Data is either invalid, or it is encoded using an unsupported format.

    I/flutter ( 4808): Another exception was thrown: Exception: operation failed

Code is as following:

    Widget _getImages(String url) {

    return new CachedNetworkImage(

      imageUrl: url,

      placeholder: new Center(child: new CircularProgressIndicator()),

      errorWidget: new ListView(

        children: <Widget>[

          new CachedNetworkImage(

            imageUrl: url.split('.')[0] + '-0.' + url.split('.')[1],

            placeholder: new Center(child: new CircularProgressIndicator()),

          ),

          new CachedNetworkImage(

            imageUrl: url.split('.')[0] + '-1.' + url.split('.')[1],

          )

        ],

      ),

    );

    }

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[Raman Plaha]

hi there, try this code, it worked for me 

child: Center(
child: Image.network(products[index].productImageList[0], fit: BoxFit.contain,
errorBuilder: (BuildContext context, Object exception, StackTrace stackTrace) {
return Image.asset("assets/defimg.jpg", fit: BoxFit.contain);
},
),
),