Image.network() 失败时无法捕获 NetworkImageLoadException答案

【问题标题】：Cannot catch NetworkImageLoadException when Image.network() failedImage.network() 失败时无法捕获 NetworkImageLoadException
【发布时间】：2021-07-06 17:47:38
【问题描述】：

我使用 Image.network() 从 URL 显示图像我就是这样用的

Image image = Image.network(
      _auth.currentUser!.photoURL!,
      width: 100.getWidth(context),
      height: 100.getWidth(context),
      frameBuilder: (context, child, frame, wasSynchronouslyLoaded) {
        return wasSynchronouslyLoaded
            ? child
            : _profileImagePlaceholder(context);
      },
      loadingBuilder: (context, child, loadingProgress) {
        return loadingProgress == null
            ? child
            : _profileImagePlaceholder(context);
      },
      errorBuilder: (context, error, stackTrace) {
        return _profileImagePlaceholder(context);
      },
    );

但即使我设置了 errorBuilder 甚至用 try/catch 包装了整个东西这个NetworkImageLoadException 还在显示

完全例外

The following NetworkImageLoadException was thrown resolving an image codec:
HTTP request failed, statusCode: 403,


When the exception was thrown, this was the stack:
#0      NetworkImage._loadAsync (package:flutter/src/painting/_network_image_io.dart:99:9)
<asynchronous suspension>
...

Image provider:
  NetworkImage("https://firebasestorage.googleapis.com/v0/b/biddee-co.appspot.com/o/profiles%2FdefaultProfile.png?alt=media&token=a4a99031-aabd-4597-b075-77ecb2d3e594",
  scale: 1.0)
Image key:
  NetworkImage("https://firebasestorage.googleapis.com/v0/b/biddee-co.appspot.com/o/profiles%2FdefaultProfile.png?alt=media&token=a4a99031-aabd-4597-b075-77ecb2d3e594",
  scale: 1.0)

【问题讨论】：

您找到解决方案了吗？我也有同样的问题。甚至 try/catch 也不做任何事情，应用程序会因为“未捕获的异常”而暂停。

标签： flutter flutter-image

【解决方案1】：

在包中：flutter/src/painting/_network_image_io.dart


if (response.statusCode != HttpStatus.ok) {
    // The network may be only temporarily unavailable, or the file will be
    // added on the server later. Avoid having future calls to resolve
    // fail to check the network again.
    await response.drain<List<int>>();
    throw image_provider.NetworkImageLoadException(statusCode: response.statusCode, uri: resolved);
}

该评论是导致异常的原因。

网络可能只是暂时不可用，或者文件稍后会添加到服务器上。避免以后调用来解决无法再次检查网络。

【讨论】：

【解决方案2】：

您可以为此使用 ErrorBuilder

Image.network('Your image url...',
    errorBuilder: (BuildContext context, Object exception, StackTrace stackTrace) {
        return Text('Error');
    },
),

查找文档from here

【讨论】：

我已经按照我提到的那样做了，但它仍然给出了异常