Is there any way to handle image url that not containt an image by using CachedNetworkImage package?
This is my code and when I do images loading, these errors are always popping up
CachedNetworkImage(
imageUrl: imageUrl,
placeholder: (context, url) => Center(
child: CircularProgressIndicator(
color: Theme.of(context).accentColor)),
errorWidget: (context, url, error) => BookErrorImage(),
fit: BoxFit.cover,
),
[]
Related
I am not able to show a circular loading indicator or an image while flutter is loading the image from the network.
image: DecorationImage(
image: NetworkImage(
Juegos_de_siempre[index].url_foto,
),
fit: BoxFit.fill,
),
Flutter's documentation suggested the usage of FadeInImage for the placeholder functionality. Here's a link to an example on Flutter's documentation.
You cannot use FadeInImage inside a DecorationImage, so you have to wrap it inside a Stack instead like shown in this thread.
Use CacheNetworkImage Package.Click here.
This is sample code.
CachedNetworkImage(
width: 100,
height: 100,
fit: BoxFit.cover,
imageUrl: imageUrl,
placeholder: (context, url) => const Center(
child: CupertinoActivityIndicator(),
), // replace with your asset image
errorWidget: (context, url, error) =>
const Icon(Icons.error),
),
I've just implemented the Flutter package cached_network_image and I wonder how I can preload images so they're available later in an instant. I retrieve all image-urls that will be used later from the our server.
I've defined my custom cache manager getter:
class LocalCacheManager {
static const key = 'customCacheKey';
static CacheManager instance = CacheManager(
Config(
key,
stalePeriod: const Duration(days: 14),
maxNrOfCacheObjects: 200,
repo: JsonCacheInfoRepository(databaseName: key),
fileSystem: LocalCacheFileSystem(key),
fileService: HttpFileService(),
),
);
}
Here's how I currently try to preload the image:
LocalCacheManager.instance.downloadFile(MY_IMAGE_URL)),
And here's how I create the widget:
child: CachedNetworkImage(imageUrl: MY_IMAGE_URL, cacheManager: LocalCacheManager.instance),
But I can clearly see that files are always cached again as soon as I create the CachedNetworkImage.
You can use Flutter Cache Manager like this
DefaultCacheManager().downloadFile(MY_IMAGE_URL).then((_) {});
Later, just use your cached image like this
child: CachedNetworkImage(imageUrl: MY_IMAGE_URL,),
Simplest and workable way is to use precacheImage (flutter build-in function) with CachedNetworkImageProvider:
Image image = Image(
image: CachedNetworkImageProvider(/* url */),
fit: BoxFit.cover,
);
precacheImage(image.image, context);
return Padding(
padding: EdgeInsets.symmetric(horizontal: 16.0),
child: ClipRRect(
borderRadius: BorderRadius.circular(8.0),
child: image,
),
);
cached_network_image: ^2.0.0
CachedNetworkImage(
imageUrl: yoururl,
errorWidget: (context, url, error) => Text("error"),
imageBuilder: (context, imageProvider) => CircleAvatar(
radius: 120,
backgroundImage: imageProvider,
),
placeholder: (context, url) => CircularProgressIndicator(
backgroundColor: primary,
),
),
My app has a list of pages you can swipe between. These pages include network images. The problem is, the network images are fetched and built only when they are visible, meaning the user watches the whole process happen.
I understand this is the intentional functionality of flutter for efficiency, but I am looking for a way to fetch, load and cache a page (that contains network images) before the user navigates to it.
Now
Goal
In your pubspec.yaml file,
Add this as a dependency
meet_network_image:^0.1.2
In your dart file, where you want the image to be, place this line of code
MeetNetworkImage(
imageUrl:
"Your image url.jpg",
loadingBuilder: (context) => Center(
child: CircularProgressIndicator(),
),
errorBuilder: (context, e) => Center(
child: Text('Error appear!'),
),
),
just use cached_network_image package like this:
CachedNetworkImage(
imageUrl: "image path",
placeholder: (context, url) => CircularProgressIndicator(),
errorWidget: (context, url, error) => Icon(Icons.error),
),
Switch airplane on mode and navigate to a StatefulWidget that includes a NetworkImage. The image fails to load since there is no connectivity. Now switch on airplane mode off. The image doesn't load. Navigating to another view and back again also doesn't help. Minimizing the app doesn't help, but restarting it completely does.
How would you resolve this? How do I make Flutter try to reload the image connectivity is regained?
Add the flutter_image plugin and use NetworkImageWithRetry.
After 2 days of trying all image plugins and answers on stackoverflow. I realized the error goes away when I go back and come back to same screen. So I retried loading images 3 times.
CachedNetworkImage(
key: ValueKey(imageUrl
.split),
placeholder: (context, url) => Padding(
padding: EdgeInsets.all(
MediaQuery.of(context).size.width * 0.2),
child: CircularProgressIndicator()),
errorWidget: (context, url, error) => CachedNetworkImage(
key: ValueKey(imageUrlsplit +
'retry1'),
placeholder: (context, url) =>
Padding(padding: EdgeInsets.all(MediaQuery.of(context).size.width * 0.2), child: CircularProgressIndicator()),
errorWidget: (context, url, error) => CachedNetworkImage(key: ValueKey(imageUrlsplit + 'retry2'), placeholder: (context, url) => Padding(padding: EdgeInsets.all(MediaQuery.of(context).size.width * 0.2), child: CircularProgressIndicator()), errorWidget: (context, url, error) => Text(error.toString()), imageUrl: imageUrlsplit),
imageUrl: imageUrlsplit),
imageUrl: imageUrlsplit)
I want to show CachedNetworkImage in CircleAvatar Widget but backgroundImage parameter require ImageProvider.
Use CachedNetworkImageProvider
Creates an ImageProvider which loads an image from the url, using the
scale. When the image fails to load errorListener is called.
If what you want is just a circle-shaped CachedNetworkImage, you can use ClipOval:
ClipOval(
child: CachedNetworkImage(
width: 32,
height: 32,
fit: BoxFit.cover,
imageUrl: 'BLA.jpg',
placeholder: CircularProgressIndicator(),
),
),
please use imageBuilder from CachedNetworkImage
CachedNetworkImage(
placeholder: (context, url) => CircularProgressIndicator(),
errorWidget: (context, url, error) => new Icon(Icons.error),
fit: BoxFit.contain,
imageUrl: imagePath,
imageBuilder: (context, imageProvider) { // you can access to imageProvider
return CircleAvatar( // or any widget that use imageProvider like (PhotoView)
backgroundImage: imageProvider,
);
},
)
If your intention is to show the image inside a circular.
Use:
ClipRRect(borderRadius: BorderRadius.circular(100),
child: CachedNetworkImage(...))
If you want to convert the CachedNetworkImage into ImageProvider
Use:
CachedNetworkImageProvider(url)