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flutter报错处理-一
|解决方案
字数总计: 2.2k|阅读时长: 11 分钟

The relevant error-causing widget was Swiper

flutter_swiper_plus: ^2.0.4

直接引入报错：

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Swiper(
  itemBuilder: (BuildContext context,int index){
    return new Image.network("http://via.placeholder.com/350x150",fit: BoxFit.fill,);
  },
  itemCount: 3,
  pagination: new SwiperPagination(),
  control: new SwiperControl(),
),
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════════ Exception caught by rendering library ═════════════════════════════════
RenderBox was not laid out: RenderViewport#3e1ad NEEDS-PAINT
'package:flutter/src/rendering/box.dart':
package:flutter/…/rendering/box.dart:1
Failed assertion: line 1927 pos 12: 'hasSize'

The relevant error-causing widget was
Swiper
lib/home/home.dart:70

改进：

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Container(
  height: 200,
  padding: EdgeInsets.all(10.0),
  child: Swiper(
    itemBuilder: (BuildContext context,int index){
      var images = <String> [
        // "http://www.quanjing.com/image/2018image/homepage/1.jpg?v=8",
        "https://via.placeholder.com/288x188",
        "https://via.placeholder.com/200x100",
        "https://via.placeholder.com/200x150",
      ];
      return new Image.network(
        images[index % images.length],
        fit: BoxFit.fill,
      );
    },
    autoplay: true,
    itemCount: 3,
    pagination: new SwiperPagination(),
    control: new SwiperControl(),
  ),
),

Your project requires a newer version of the Kotlin Gradle plugin

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Launching lib/main.dart on Android SDK built for x86 in debug mode...
lib/main.dart:1
e: Incompatible classes were found in dependencies. Remove them from the classpath or use '-Xskip-metadata-version-check' to suppress errors
e: /Users/guanguan/.gradle/caches/transforms-2/files-2.1/0464082e81de712709b8918eac577657/jetified-kotlin-stdlib-jdk7-1.6.10.jar!/META-INF/kotlin-stdlib-jdk7.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.6.0, expected version is 1.1.15.

...(一系列和上面一样的报错)

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':fluttertoast:compileDebugKotlin'.
> Compilation error. See log for more details

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 33s
[!] Your project requires a newer version of the Kotlin Gradle plugin.
    Find the latest version on https://kotlinlang.org/docs/gradle.html#plugin-and-versions, then update /Users/guanguan/Downloads/Github/app/android/build.gradle:
    ext.kotlin_version = '<latest-version>'
Exception: Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

将 android - build.gradle 文件中的 ext.kotlin_version 改为最新的版本即可。附上 Kotlin 最新的 版本地址。

1.3.50 -> 1.6.10

Error: Expected named argument

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: Error: Expected named argument.
lib/mine/userinfo.dart:162
                  _sample == null ? _buildOpeningImage() : _buildCroppingImage(),
                                  ^
: Error: No named parameter with the name '#1'.
lib/mine/userinfo.dart:153
                title: Container(
                                ^^...
: Context: Found this candidate, but the arguments don't match.
../…/widgets/container.dart:253
  Container({

  ^^^^^^^^^
Restarted application in 804ms.

在 Container 组件下，将child:添加在_sample == null ? _buildOpeningImage() : _buildCroppingImage(),这句的前面即可。

exception caught by widgets library

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════════ Exception caught by image resource service ════════════════════════════
The following HttpException was thrown resolving an image codec:
Connection closed while receiving data, uri = http://www.bobdy.com/pic/app/2021/12/163982066976162464.jpg
...

错误原因：

服务器的图片未成功加载。后端解决了。

LateInitializationError: Field ‘data’ has not been initialized, got error。

Cause of Error:

在初始化之前使用后期变量时会发生此错误。必须记住一件事，已经使用了一些声明为late的数据或变量，但它们的值在使用之前没有更改或存储。

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//For example:
late String name;
@override
Widget build(BuildContext context) {
  return Scaffold(
        body: Text(name)
        //runtime error: 
        //LateInitializationError: Field 'name' has not been initialized.
  );
} 
//How to solved?
late String name; -> String? name;
//请记住：在使用之前，必须在后期变量分配一些东西。

How to solve such problems?

just change

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late Mydata data;

to

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Mydata? data;

ohmyzsh 更新报错；flutter 升级更新报错。

ohmyzsh 不能更新，报错：

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fatal: unable to access 'https://github.com/ohmyzsh/ohmyzsh.git/': Failed to connect to github.com port 443: Operation timed out

另外一个报错就是 flutter 升级更新：

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ProcessException: Process exited abnormally:
fatal: 无法访问 'https://github.com/flutter/flutter.git/'：LibreSSL SSL_read: error:02FFF03C:system
library:func(4095):Operation timed out, errno 60
  Command: git fetch --tags

还有然后修改了一下 host 文件：

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sudo vi /etc/hosts

虽然还能 ping 通 github 的地址，但报错 443，请求超时，代理的问题。于是，将其中所有的 github 的 dns 都注释/删掉：

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#140.82.113.4                   github.com
#199.232.69.194                 github.global.ssl.fastly.net
#185.199.108.153                assets-cdn.github.com
#185.199.109.153                assets-cdn.github.com
#185.199.110.153                assets-cdn.github.com
#185.199.111.153                assets-cdn.github.com

OK，然后科学上网，升级，flutter 从 2.8.1 升到了 2.10.3，本以为到此就结束了。然后后续又出现了下列问题：

HTTP Host Availability

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#flutter doctor -v
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.10.3, on macOS 12.3 21E230 darwin-x64, locale zh-Hans-CN)
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[✓] Xcode - develop for iOS and macOS (Xcode 13.3)
[✓] Chrome - develop for the web
[✓] Android Studio (version 4.1)
[✓] IntelliJ IDEA Ultimate Edition (version 2021.1.1)
[✓] VS Code (version 1.65.2)
[✓] Connected device (2 available)
[!] HTTP Host Availability
    ✗ HTTP host https://maven.google.com/ is not reachable. Reason: An error occurred while checking the HTTP host: Operation timed out

github 上也找到了同样的问题，分别是 Windows版本 和 Mac版本，科学上网也仍然 ping 不通 maven.google.com：

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ping maven.google.com
PING www3.l.google.com (142.251.42.238): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
Request timeout for icmp_seq 4
Request timeout for icmp_seq 5
Request timeout for icmp_seq 6
Request timeout for icmp_seq 7
^C
--- www3.l.google.com ping statistics ---
9 packets transmitted, 0 packets received, 100.0% packet loss

然后顺着网址访问了www3.l.google.com：

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您的连接不是私密连接
攻击者可能会试图从 www3.l.google.com 窃取您的信息（例如：密码、通讯内容或信用卡信息）。了解详情
NET::ERR_CERT_COMMON_NAME_INVALID

www3.l.google.com 通常会使用加密技术来保护您的信息。Chrome 此次尝试连接到 www3.l.google.com 时，该网站发回了异常的错误凭据。这可能是因为有攻击者在试图冒充 www3.l.google.com，或者 Wi-Fi 登录屏幕中断了此次连接。请放心，您的信息仍然是安全的，因为 Chrome 尚未进行任何数据交换便停止了连接。

您目前无法访问 www3.l.google.com，因为此网站使用了 HSTS。网络错误和攻击通常是暂时的，因此，此网页稍后可能会恢复正常。

访问 maven.google.com/web/index：

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404. That’s an error.

The requested URL /web/index was not found on this server. That’s all we know.

这里也有关于 maven.google.com 404的问题。

知识拓展：ping不通，可能是因为 ICMP 协议被限制了。ICMP 是（Internet Control Message Protocol）Internet 控制报文协议。它是TCP/IP 协议族的一个子协议，用于在 IP 主机、路由器之间传递控制消息。控制消息是指网络通不通、主机是否可达、路由是否可用等网络本身的消息。这些控制消息虽然并不传输用户数据，但是对于用户数据的传递起着重要的作用。

悬而未决～

后续：

找到 这篇文章，文末，笔者 christopherfujino 在昨天（2022-03-22）回复到：

I am locking this issue as it has been fixed in #98293, which is currently in the beta release (and will be in the next stable).

Even if you are hitting this issue on stable, it is safe to ignore it.

意思是可以忽略它。

升级 flutter 后解决，参见：https://yexingshusheng.com/flutter-bao-cuo-chu-li-si.html

Warning: The plugin *** requires Android SDK version 31.

在更新完后，运行 flutter 项目，报错：

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Running "flutter pub get" in app...
Launching lib/main.dart on Android SDK built for x86 in debug mode...
lib/main.dart:1
Warning: The plugin flutter_plugin_android_lifecycle requires Android SDK version 31.
Warning: The plugin image_picker requires Android SDK version 31.
Warning: The plugin path_provider_android requires Android SDK version 31.
Warning: The plugin video_player_android requires Android SDK version 31.
One or more plugins require a higher Android SDK version.
Fix this issue by adding the following to /Users/guanguan/Downloads/Github/app/android/app/build.gradle:
android {
  compileSdkVersion 31
  ...
}


FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:checkDebugAarMetadata'.
> Multiple task action failures occurred:
   > A failure occurred while executing com.android.build.gradle.internal.tasks.CheckAarMetadataWorkAction
      > The minCompileSdk (31) specified in a
        dependency's AAR metadata (META-INF/com/android/build/gradle/aar-metadata.properties)
        is greater than this module's compileSdkVersion (android-30).
        Dependency: androidx.window:window-java:1.0.0-beta04.
        AAR metadata file: /Users/guanguan/.gradle/caches/transforms-2/files-2.1/ad201fac15a88598107ec645f351f5b4/jetified-window-java-1.0.0-beta04/META-INF/com/android/build/gradle/aar-metadata.properties.
   > A failure occurred while executing com.android.build.gradle.internal.tasks.CheckAarMetadataWorkAction
      > The minCompileSdk (31) specified in a
        dependency's AAR metadata (META-INF/com/android/build/gradle/aar-metadata.properties)
        is greater than this module's compileSdkVersion (android-30).
        Dependency: androidx.window:window:1.0.0-beta04.
        AAR metadata file: /Users/guanguan/.gradle/caches/transforms-2/files-2.1/03c633e46d75bfb21f082f0417f55161/jetified-window-1.0.0-beta04/META-INF/com/android/build/gradle/aar-metadata.properties.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1m 14s
Exception: Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

可以发现，有四个插件要求 Android SDK version 31，根据提示修改文件，项目 /android/app/build.gradle，将 compileSdkVersion 从 30改为 31 即可。重新编译，有三个警告，但正常运行。

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注: /Users/guanguan/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/device_info-2.0.3/android/src/main/java/io/flutter/plugins/deviceinfo/DeviceInfoPlugin.java使用了未经检查或不安全的操作。
注: 有关详细信息, 请使用 -Xlint:unchecked 重新编译。
注: /Users/guanguan/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/image_crop-0.4.0/android/src/main/java/com/lykhonis/imagecrop/ImageCropPlugin.java使用或覆盖了已过时的 API。
注: 有关详细信息, 请使用 -Xlint:deprecation 重新编译。
注: /Users/guanguan/Applications/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider_android-2.0.12/android/src/main/java/io/flutter/plugins/pathprovider/PathProviderPlugin.java使用了未经检查或不安全的操作。
注: 有关详细信息, 请使用 -Xlint:unchecked 重新编译。
————————TBC————————
文章作者: 夜行书生
文章链接: https://yexingshusheng.com/2022/03/flutter-bao-cuo-chu-li-yi.html
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202203报错处理flutter