当图片加载失败时,可以使用errorBuilder属性来提供一个错误指示: Image.network('https://example.com/image.png', errorBuilder: (context, error, stackTrace) {returnIcon(Icons.error); }, ) 图片缓存 Flutter 的图片加载器会自动缓存网络图片,以提高性能。你可以
NetworkImage('https://flutter.github.io/assets-for-api-docs/assets/widgets/owl.jpg') : AssetImage('images/icon_hzw01.jpg')); } 3. loadingBuilder loadingBuilder加载状态帧构造器,在加载过程中展示的Image构造器;查看效果图可以看到,设置了两层内边距,因为在loading状态和加载完状态时都对child设置了内边...
当图片加载失败后会显示imageErrorBuilder,再更改snapshot.data!.artUri为正常Uri并且重新构建后会一直显示占位符(一片白色),即使在Devtools Network中看到图片请求成功且没有异常,仍为占位符,不会显示图片 flutterflutter-android 有用关注2收藏 回复 阅读1.5k AI BotBETA 出现FadeInImage在图片加载成功后仍显示占位符...
NetworkImage('https://flutter.github.io/assets-for-api-docs/assets/widgets/owl.jpg') : AssetImage('images/icon_hzw01.jpg')); } 4. errorBuilder errorBuilder 为失败时替换 Image 展示的构造器; 代码语言:javascript 代码运行次数:0 运行 AI代码解释 _imageWid03(isNet) { return Image( frameBuild...
errorBuilder:(context, o, trace) {returnContainer( child:Text('${o}\n11111${trace.toString()}', style:TextStyle(color:Colors.white), ), ); }, ):ElevatedButton( onPressed:_chooseImage, child:Text('Select Image'))) ], ), ),
Steps to Reproduce Create a new flutter project and use this gist as the main.dart Compile and run on Android or iOS Expected results: The image should not load (as the image data is invalid) and the errorBuilder should be called instead...
NetworkImage('https://flutter.github.io/assets-for-api-docs/assets/widgets/owl.jpg'):AssetImage('images/icon_hzw01.jpg'));} 4. errorBuilder errorBuilder为失败时替换Image展示的构造器; _imageWid03(isNet){returnImage(frameBuilder:(BuildContext context,Widget child,int frame,bool wasSynchronously...
Image.network是Flutter提供的一个用于从网络加载图片的组件。它接受一个URL作为参数,并在指定的URL上发起HTTP请求来获取图片数据。 Image.network(') 1. 2. 3. 2. 设置默认图片 为了在图片加载失败时显示一个默认图片,我们可以使用Image.network的errorBuilder属性。errorBuilder接受一个函数作为参数,该函数负责构建...
this.loadingBuilder, this.errorBuilder, this.semanticLabel, this.excludeFromSemantics = false, this.width, // 组件宽度 this.height, // 组件高度 this.color, this.colorBlendMode, this.fit, this.alignment = Alignment.center, this.repeat = ImageRepeat.noRepeat, ...
?NetworkImage('https://flutter.github.io/assets-for-api-docs/assets/widgets/owl.jpg') :AssetImage('images/icon_hzw01.jpg')); } 4. errorBuilder errorBuilder为失败时替换Image展示的构造器; _imageWid03(isNet) { returnImage( frameBuilder: (BuildContext context, Widget child, int frame, bool...