从上面的源码中,我们可以看到Flutter 会把图片缓存相关的逻辑维护在 ImageCache这个对象中。 二、缓存管理 当我们进入ImageCache 会发现,在ImageCache 中,有三个Map: final Map<Object, _PendingImage> _pendingImages = <Object, _PendingImage>{}; final Map<Object, _CachedImage> _cache = <Object, _Cached...
}elseif(snapshot.hasError) {returnconstIcon(Icons.person, size:100); }else{returnCachedNetworkImage( imageUrl: snapshot.data!, fit: BoxFit.cover, placeholder: (context, url) =>constCircularProgressIndicator(), errorWidget: (context, url, error) =>constIcon(Icons.person, si...
Flutter中的'ImageCache'是一个用于缓存图像的类。它可以在内存中缓存图像,并在需要时快速地加载它们。ImageCache可以是全局的,也可以是特定于单个页面或部件的。 当我们在Flutter应用程序中加载图像时,默认情况下会将其缓存在ImageCache中。每当我们需要在应用程序中使用同一张图像时,Flutter会从ImageCache中查找它,并...
I/flutter (21047): CacheManager: Failed to download file from https://i1.xx.com/623946/4c71965fac192ebe.jpg with error: I/flutter (21047): HttpException: No valid statuscode. Statuscode was 404 如果是CachedNetworkImage则如下: I/flutter (21047): Path: I/flutter (21047): /data/user/0...
errorWidget: (context, url, error) => Icon(Icons.error), ), 图像加载失败:404,403等 如果你使用了CachedNetworkImageProvider的话,错误信息如: I/flutter (21047): CacheManager: Failed to download file from https://pic.xx.com/28000.jpg with error: ...
throw Exception('NetworkImage is an empty file: $url'); } await _cacheManager.putFile(cacheFile, bytes); return await _decode(bytes); 这里用到了 http 库获取图片的字节数据,然后写入文件缓存,并进行解码。解码的过程在 _decode 函数中:
A flutter library to show images from the internet and keep them in the cache directory. Sponsors Try the Flutter Chat Tutorial 💬 How to use The CachedNetworkImage can be used directly or through the ImageProvider. Both the CachedNetworkImage as CachedNetworkImageProvider have minimal support ...
FLUTTER_STORAGE_BASE_URL window 镜像 Image属性 void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Image组件的学习', home: Scaffold( appBar: AppBar(title: Text('Image组件的学习')),...
I was surprised by the error I had while getting a picture from a web server, whenever I call CachedNetworkImage and I put the URL into the imageUrl this exception was thrown:CacheManager: Failed to download a file from(URL...) HandshakeException: Handshake error in client (OS...
1.一个图片的 url Widget _buildWidget() { return Image.network('https://upload-images.jianshu.io/upload_images/5361063-e413832da0038304.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/800'); } 能够正常显示如下图: 2.不可访问 url,如随便一个字符串 test ...