【发布时间】：2019-11-20 23:38:15
【问题描述】：
当我将 Flutter 版本升级到 1.7.8+hotfix.3 时，我收到了几条错误消息。
这是消息：
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 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 Flutter Doctor 信息：
flutter doctor
医生总结（要查看所有详细信息，请运行 flutter doctor -v）：[√] Flutter (Channel stable, v1.7.8+hotfix.3, on Microsoft Windows [版本 10.0.17134.885]) [!] Android 工具链 - 为 Android 开发 设备（Android SDK 版本 28.0.3）！一些 Android 许可证没有 公认。要解决此问题，请运行：flutter doctor --android-licenses
[√] Android Studio (版本 3.2) [!] IntelliJ IDEA 社区 版本（2018.2版）X Flutter插件未安装；这 添加了 Flutter 特定的功能。 X Dart 插件未安装； 这增加了 Dart 特定的功能。 [√] VS Code（1.36.1版）
[√] 已连接设备（1 个可用）！医生发现了 2 类问题。
【问题讨论】：
标签： flutter