升级到Flatter 1.7.8修补程序时无法编译。3.

Question

当我将颤振版本升级到1.7.8修补程序时，我收到了几条错误消息。3.

以下是消息：

Compiler message:
file:///C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.12.4+1/lib/svg.dart:158:18: Error: The argument type 'String' can't be assigned to the parameter type 'DiagnosticsNode'.
 - 'DiagnosticsNode' is from 'package:flutter/src/foundation/diagnostics.dart' ('file:///C:/src/flutter/packages/flutter/lib/src/foundation/diagnostics.dart').
Try changing the type of the parameter, or casting the argument to 'DiagnosticsNode'.
        context: 'picture failed to precache',
                 ^
file:///C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.12.4+1/lib/src/picture_provider.dart:335:20: Error: The argument type 'String' can't be assigned to the parameter type 'DiagnosticsNode'.
 - 'DiagnosticsNode' is from 'package:flutter/src/foundation/diagnostics.dart' ('file:///C:/src/flutter/packages/flutter/lib/src/foundation/diagnostics.dart').
Try changing the type of the parameter, or casting the argument to 'DiagnosticsNode'.
          context: 'while resolving a picture',
                   ^
file:///C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.12.4+1/lib/src/picture_provider.dart:337:33: Error: The argument type 'Null Function(StringBuffer)' can't be assigned to the parameter type 'Iterable<DiagnosticsNode> Function()'.
 - 'StringBuffer' is from 'dart:core'.
 - 'Iterable' is from 'dart:core'.
 - 'DiagnosticsNode' is from 'package:flutter/src/foundation/diagnostics.dart' ('file:///C:/src/flutter/packages/flutter/lib/src/foundation/diagnostics.dart').
Try changing the type of the parameter, or casting the argument to 'Iterable<DiagnosticsNode> Function()'.
          informationCollector: (StringBuffer information) {
                                ^
file:///C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.12.4+1/lib/src/picture_provider.dart:432:31: Error: The argument type 'Null Function(StringBuffer)' can't be assigned to the parameter type 'Iterable<DiagnosticsNode> Function()'.
 - 'StringBuffer' is from 'dart:core'.
 - 'Iterable' is from 'dart:core'.
 - 'DiagnosticsNode' is from 'package:flutter/src/foundation/diagnostics.dart' ('file:///C:/src/flutter/packages/flutter/lib/src/foundation/diagnostics.dart').
Try changing the type of the parameter, or casting the argument to 'Iterable<DiagnosticsNode> Function()'.
        informationCollector: (StringBuffer information) {
                              ^
file:///C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.12.4+1/lib/src/picture_provider.dart:495:31: Error: The argument type 'Null Function(StringBuffer)' can't be assigned to the parameter type 'Iterable<DiagnosticsNode> Function()'.
 - 'StringBuffer' is from 'dart:core'.
 - 'Iterable' is from 'dart:core'.
 - 'DiagnosticsNode' is from 'package:flutter/src/foundation/diagnostics.dart' ('file:///C:/src/flutter/packages/flutter/lib/src/foundation/diagnostics.dart').
Try changing the type of the parameter, or casting the argument to 'Iterable<DiagnosticsNode> Function()'.
        informationCollector: (StringBuffer information) {
                              ^
file:///C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.12.4+1/lib/src/picture_provider.dart:559:31: Error: The argument type 'Null Function(StringBuffer)' can't be assigned to the parameter type 'Iterable<DiagnosticsNode> Function()'.
 - 'StringBuffer' is from 'dart:core'.
 - 'Iterable' is from 'dart:core'.
 - 'DiagnosticsNode' is from 'package:flutter/src/foundation/diagnostics.dart' ('file:///C:/src/flutter/packages/flutter/lib/src/foundation/diagnostics.dart').
Try changing the type of the parameter, or casting the argument to 'Iterable<DiagnosticsNode> Function()'.
        informationCollector: (StringBuffer information) {
                              ^
file:///C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.12.4+1/lib/src/picture_stream.dart:256:16: Error: The argument type 'String' can't be assigned to the parameter type 'DiagnosticsNode'.
 - 'DiagnosticsNode' is from 'package:flutter/src/foundation/diagnostics.dart' ('file:///C:/src/flutter/packages/flutter/lib/src/foundation/diagnostics.dart').
Try changing the type of the parameter, or casting the argument to 'DiagnosticsNode'.
      context: context,
               ^
file:///C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.12.4+1/lib/src/picture_stream.dart:301:18: Error: The argument type 'String' can't be assigned to the parameter type 'DiagnosticsNode'.
 - 'DiagnosticsNode' is from 'package:flutter/src/foundation/diagnostics.dart' ('file:///C:/src/flutter/packages/flutter/lib/src/foundation/diagnostics.dart').
Try changing the type of the parameter, or casting the argument to 'DiagnosticsNode'.
        context: 'resolving a single-frame picture html" target="_blank">stream',
                 ^
file:///C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.12.4+1/lib/src/svg/parser_state.dart:399:35: Error: The argument type 'Null Function(StringBuffer)' can't be assigned to the parameter type 'Iterable<DiagnosticsNode> Function()'.
 - 'StringBuffer' is from 'dart:core'.
 - 'Iterable' is from 'dart:core'.
 - 'DiagnosticsNode' is from 'package:flutter/src/foundation/diagnostics.dart' ('file:///C:/src/flutter/packages/flutter/lib/src/foundation/diagnostics.dart').
Try changing the type of the parameter, or casting the argument to 'Iterable<DiagnosticsNode> Function()'.
            informationCollector: (StringBuffer buff) {
                                  ^
file:///C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.12.4+1/lib/src/svg/parser_state.dart:408:22: Error: The argument type 'String' can't be assigned to the parameter type 'DiagnosticsNode'.
 - 'DiagnosticsNode' is from 'package:flutter/src/foundation/diagnostics.dart' ('file:///C:/src/flutter/packages/flutter/lib/src/foundation/diagnostics.dart').
Try changing the type of the parameter, or casting the argument to 'DiagnosticsNode'.
            context: 'in _Element.clipPath',
                     ^
file:///C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.12.4+1/lib/src/svg/parser_state.dart:798:31: Error: The argument type 'Null Function(StringBuffer)' can't be assigned to the parameter type 'Iterable<DiagnosticsNode> Function()'.
 - 'StringBuffer' is from 'dart:core'.
 - 'Iterable' is from 'dart:core'.
 - 'DiagnosticsNode' is from 'package:flutter/src/foundation/diagnostics.dart' ('file:///C:/src/flutter/packages/flutter/lib/src/foundation/diagnostics.dart').
Try changing the type of the parameter, or casting the argument to 'Iterable<DiagnosticsNode> Function()'.
        informationCollector: (StringBuffer buff) {
                              ^
file:///C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.12.4+1/lib/src/svg/parser_state.dart:809:18: Error: The argument type 'String' can't be assigned to the parameter type 'DiagnosticsNode'.
 - 'DiagnosticsNode' is from 'package:flutter/src/foundation/diagnostics.dart' ('file:///C:/src/flutter/packages/flutter/lib/src/foundation/diagnostics.dart').
Try changing the type of the parameter, or casting the argument to 'DiagnosticsNode'.
        context: 'in parseSvgElement',
                 ^
file:///C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.12.4+1/lib/src/utilities/errors.dart:8:32: Error: The argument type 'String' can't be assigned to the parameter type 'DiagnosticsNode'.
 - 'DiagnosticsNode' is from 'package:flutter/src/foundation/diagnostics.dart' ('file:///C:/src/flutter/packages/flutter/lib/src/foundation/diagnostics.dart').
Try changing the type of the parameter, or casting the argument to 'DiagnosticsNode'.
      context: 'in $methodName',
                               ^
file:///C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.12.4+1/lib/src/utilities/errors.dart:10:29: Error: The argument type 'Null Function(StringBuffer)' can't be assigned to the parameter type 'Iterable<DiagnosticsNode> Function()'.
 - 'StringBuffer' is from 'dart:core'.
 - 'Iterable' is from 'dart:core'.
 - 'DiagnosticsNode' is from 'package:flutter/src/foundation/diagnostics.dart' ('file:///C:/src/flutter/packages/flutter/lib/src/foundation/diagnostics.dart').
Try changing the type of the parameter, or casting the argument to 'Iterable<DiagnosticsNode> Function()'.
      informationCollector: (StringBuffer buff) {
                            ^
FAILURE: Build failed with an exception.
* Where:
Script 'C:\src\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 665
* What went wrong:
Execution failed for task ':app:compileflutterBuildDebugX86'.
> Process 'command 'C:\src\flutter\bin\flutter.bat'' finished with non-zero exit value 1
* 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 41s
Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

这是我的颤振医生信息：

flutter doctor

医生摘要（要查看所有详细信息，请运行flutter医生-v): [√] Flutter（Channel稳定，v1.7.8热修复补丁.3，在Microsoft Windows上[版本10.0.17134.885 ]) [!] Android工具链-为Android设备开发（AndroidSDK版本28.0.3）！不接受某些Android许可证。要解决此问题，请运行：flutter医生--android-许可证
[√]Android Studio（版本3.2）[！]IntelliJ IDEA社区版（版本2018.2）未安装X Flutter插件；这增加了Flutter特定功能。未安装X Dart插件；这增加了Dart特定功能。[√]VS Code（版本1.36.1）
[√]连接的设备（1个可用）

! 医生发现了两类问题。

Answer 1

在pubspec中，将flatter_svg的版本至少更新为0.13.0。yml