flutter - 飞镖 :tml and dart:js not found error flutter

Question

我正在尝试在我的聊天应用程序中使用语音转文本和文本转语音功能来制作语音消息。我完全遵循了这个文档 https://pub.dev/packages/flutter_tts/example .但我不得不导入另一个名为 flutter_tts_web.dart 的库。我认为这应该没什么大不了的，但它似乎导致了大错误。这是堆栈跟踪

../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_tts-1.2.6/lib/flutter_tts_web.dart:2:8: Error: Not found: 'dart:html'
import 'dart:html' as html;
       ^
../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_tts-1.2.6/lib/flutter_tts_web.dart:3:8: Error: Not found: 'dart:js'
import 'dart:js';
       ^
../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_tts-1.2.6/lib/flutter_tts_web.dart:31:3: Error: Type 'html.SpeechSynthesis' not found.
  html.SpeechSynthesis synth;
  ^^^^^^^^^^^^^^^^^^^^
../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_tts-1.2.6/lib/flutter_tts_web.dart:32:3: Error: Type 'html.SpeechSynthesisUtterance' not found.
  html.SpeechSynthesisUtterance utterance;
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_tts-1.2.6/lib/flutter_tts_web.dart:31:8: Error: 'SpeechSynthesis' isn't a type.
  html.SpeechSynthesis synth;
       ^^^^^^^^^^^^^^^
../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_tts-1.2.6/lib/flutter_tts_web.dart:32:8: Error: 'SpeechSynthesisUtterance' isn't a type.
  html.SpeechSynthesisUtterance utterance;
       ^^^^^^^^^^^^^^^^^^^^^^^^
../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_tts-1.2.6/lib/flutter_tts_web.dart:37:17: Error: Method not found: 'SpeechSynthesisUtterance'.
    utterance = html.SpeechSynthesisUtterance();
                ^^^^^^^^^^^^^^^^^^^^^^^^
../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_tts-1.2.6/lib/flutter_tts_web.dart:38:18: Error: Getter not found: 'window'.
    synth = html.window.speechSynthesis;
                 ^^^^^^
../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_tts-1.2.6/lib/flutter_tts_web.dart:156:63: Error: 'JsArray' isn't a type.
        context['speechSynthesis'].callMethod('getVoices') as JsArray<dynamic>;
                                                              ^^^^^^^
../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_tts-1.2.6/lib/flutter_tts_web.dart:156:9: Error: The getter 'context' isn't defined for the class 'FlutterTtsPlugin'.
 - 'FlutterTtsPlugin' is from 'package:flutter_tts/flutter_tts_web.dart' ('../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_tts-1.2.6/lib/flutter_tts_web.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'context'.
        context['speechSynthesis'].callMethod('getVoices') as JsArray<dynamic>;
        ^^^^^^^
/C:/flutter/packages/flutter_web_plugins/lib/src/plugin_registry.dart:29:5: Error: Method not found: 'webOnlySetPluginHandler'.
    ui.webOnlySetPluginHandler(_binaryMessenger.handlePlatformMessage);
    ^^^^^^^^^^^^^^^^^^^^^^^
Unhandled exception:
FileSystemException(uri=
org-dartlang-untranslatable-uri:dart%3Ahtml; message=StandardFileSystem only supports file:* and data:* URIs)
#0      StandardFileSystem.entityForUri (package:front_end/src/api_proto
type/standard_file_system.dart:33:7)
#1      asFileUri (package:vm/kernel_front_end.dart:659:37)
#2      writeDepfile (package:vm/kernel_front_end.dart:853:21)
<asynchronous suspension>
#3      FrontendCompiler.compile (package:frontend_server/frontend_server.dart:574:15)
<asynchronous suspension>
#4      _FlutterFrontendCompiler.compile (package:flutter_frontend_server/server.dart:43:22)
#5      starter (package:flutter_frontend_server/server.dart:182:27)
#6      main (file:///C:/b/s/w/ir/cache/builder/src/flutter/flutter_frontend_server/bin/starter.dart:9:30)
#7      _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:299:32)
#8      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)



FAILURE: Build failed with an exception.

* Where:
Script 'C:\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 896

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'C:\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 1m 38s
Exception: Gradle task assembleDebug failed with exit code 1

我试图删除文件，但变量 Tts State 取决于网络文件。 A;所以尝试了 flutter clean 并切换到 beta chanel。请尽快提供帮助，因为这是一场编程马拉松，我还有 8 个小时。我将几乎立即提供任何必要的代码

Answer 1

我认为这是因为 dart 没有安装，请确保你正确安装了 dart，并在安装 dart 后使用以下命令。

pub get