Flutter 2：连接服务协议时出错：无法连接http://127.0.0.1:1039/ #58588

Question

我在 Flutter 2.0.3 上启动 Flutter 模板应用程序时遇到问题。\n我收到此输出

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Launching lib/main.dart on SM J320H in debug mode...\nRunning Gradle task 'assembleDebug'...\n\xe2\x9c\x93 Built build/app/outputs/flutter-apk/app-debug.apk.\nInstalling build/app/outputs/flutter-apk/app.apk...\nError connecting to the service protocol: failed to connect to http://127.0.0.1:62719/OJaWBfEtnmY=/\n

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我正在真实的 Android 设备上启动此应用程序。\n使用 Flutter 1.22.5 启动时 - 一切正常。

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颤振医生输出：

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Doctor summary (to see all details, run flutter doctor -v):\n[\xe2\x9c\x93] Flutter (Channel stable, 2.0.3, on Mac OS X 10.15.7 19H2 darwin-x64, locale\n    en-UA)\n[\xe2\x9c\x93] Android toolchain - develop for Android devices (Android SDK version 30.0.3)\n[\xe2\x9c\x93] Xcode - develop for iOS and macOS\n[\xe2\x9c\x93] Chrome - develop for the web\n[\xe2\x9c\x93] Android Studio (version 4.1)\n[\xe2\x9c\x93] IntelliJ IDEA Ultimate Edition (version 2020.1.1)\n[\xe2\x9c\x93] VS Code (version 1.54.3)\n[\xe2\x9c\x93] Connected device (2 available)\n\n\xe2\x80\xa2 No issues found!\n

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Answer 1

我刚刚遇到了同样的问题。\n我猜这是因为你的 dart 和 flutter 版本。

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只需运行flutter upgrade即可flutter clean解决问题。

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类似的问题解决方案在这里：https ://github.com/flutter/flutter/issues/47204

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这对我有帮助。这是日志：

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PS D:\\Documents\\Work\\bus_stop_routes> flutter clean\nDeleting build...                                                  629ms\nDeleting .dart_tool...                                             567ms\nDeleting .packages...                                                0ms\nDeleting Generated.xcconfig...                                       0ms\nDeleting flutter_export_environment.sh...                            0ms\nDeleting .flutter-plugins-dependencies...                            0ms\nDeleting .flutter-plugins...                                         0ms\nPS D:\\Documents\\Work\\bus_stop_routes> flutter pub get\nRunning "flutter pub get" in bus_stop_routes...                     3.4s\nPS D:\\Documents\\Work\\bus_stop_routes> flutter run\nLaunching lib\\main.dart on SM N910H in debug mode...\nNote: C:\\flutter\\.pub-cache\\hosted\\pub.dartlang.org\\google_maps_flutter-2.0.1\\android\\src\\main\\java\\io\\flutter\\plugins\\googlemaps\\Convert.java uses or overrides a deprecated API.\nRunning Gradle task \'assembleDebug\'...\nRunning Gradle task \'assembleDebug\'... Done                        46.3s\n\xe2\x88\x9a Built build\\app\\outputs\\flutter-apk\\app-debug.apk.\nInstalling build\\app\\outputs\\flutter-apk\\app.apk...                29.0s\nActivating Dart DevTools...                                         3.1s\nError connecting to the service protocol: failed to connect to http://127.0.0.1:58851/a7SAG7gM8aI=/\nPS D:\\Documents\\Work\\bus_stop_routes> dart upgrade\nCould not find a command named "upgrade".\n\nUsage: dart [<vm-flags>] <command|dart-file> [<arguments>]\n\nGlobal options:\n-h, --help                 Print this usage information.\n-v, --verbose              Show additional command output.\n    --version              Print the Dart SDK version.\n    --enable-analytics     Enable anonymous analytics.\n    --disable-analytics    Disable anonymous analytics.\n\nAvailable commands:\n  analyze   Analyze the projects Dart code.\n  compile   Compile Dart to various formats.\n  create    Create a new project.\n  fix       Apply automated fixes to Dart source code.\n  format    Idiomatically format Dart source code.\n  migrate   Perform a null safety migration on a project or package.\n  pub       Work with packages.\n  run       Run a Dart program.\n  test      Run tests in this package.\n\nRun "dart help <command>" for more information about a command.\nSee https://dart.dev/tools/dart-tool for detailed documentation.\nPS D:\\Documents\\Work\\bus_stop_routes> flutter upgrade\nUpgrading Flutter to 2.0.4 from 2.0.3 in C:\\flutter...\nChecking Dart SDK version... \nDownloading Dart SDK from Flutter engine 2dce47073a378673f6ca095e91b8065544c3a881...       \nBuilding flutter tool... \nRunning pub upgrade... \n\nUpgrading engine...\nDownloading android-arm-profile/windows-x64 tools...               20.1s\nDownloading android-arm-release/windows-x64 tools...                8.7s\nDownloading android-arm64-profile/windows-x64 tools...              9.7s\nDownloading android-arm64-release/windows-x64 tools...              8.2s\nDownloading android-x64-profile/windows-x64 tools...                9.3s\nDownloading android-x64-release/windows-x64 tools...                7.9s\nDownloading android-x86 tools...                                   98.3s\nDownloading android-x64 tools...                                   64.8s\nDownloading android-arm tools...                                   15.6s\nDownloading android-arm-release tools...                           12.4s\nDownloading android-arm64 tools...                                 36.2s\nDownloading android-arm64-profile tools...                         18.1s\nDownloading android-arm64-release tools...                         14.6s\nDownloading android-x64-profile tools...                           19.0s\nDownloading android-x64-release tools...                           15.0s\nDownloading android-x86-jit-release tools...                       21.6s\nDownloading Web SDK...                                             42.0s\n\nFlutter 2.0.4 \xe2\x80\xa2 channel stable \xe2\x80\xa2 https://github.com/flutter/flutter.git\nFramework \xe2\x80\xa2 revision b1395592de (7 days ago) \xe2\x80\xa2 2021-04-01 14:25:01 -0700\nEngine \xe2\x80\xa2 revision 2dce47073a\nTools \xe2\x80\xa2 Dart 2.12.2\n\nRunning flutter doctor...\nDoctor summary (to see all details, run flutter doctor -v):\n[\xe2\x88\x9a] Flutter (Channel stable, 2.0.4, on Microsoft Windows [Version 10.0.19042.867], locale en-US)\n[\xe2\x88\x9a] Android toolchain - develop for Android devices (Android SDK version 30.0.3)\n[\xe2\x88\x9a] Chrome - develop for the web\n[\xe2\x88\x9a] Android Studio (version 4.1.0)\n[\xe2\x88\x9a] VS Code (version 1.55.0)\n[\xe2\x88\x9a] Connected device (3 available)\n\n\xe2\x80\xa2 No issues found!\nPS D:\\Documents\\Work\\bus_stop_routes> flutter run\nRunning "flutter pub get" in bus_stop_routes...                  1,114ms\nLaunching lib\\main.dart on SM N910H in debug mode...\nRunning Gradle task \'assembleDebug\'...                                  \nRunning Gradle task \'assembleDebug\'... Done                       107.2s\n\xe2\x88\x9a Built build\\app\\outputs\\flutter-apk\\app-debug.apk.\nInstalling build\\app\\outputs\\flutter-apk\\app.apk...                29.2s\nSyncing files to device SM N910H...                                141ms\n\nFlutter run key commands.\nr Hot reload.\nR Hot restart.\nh Repeat this help message.\nd Detach (terminate "flutter run" but leave application running).\nc Clear the screen\nq Quit (terminate the application on the device).\nAn Observatory debugger and profiler on SM N910H is available at:\nhttp://127.0.0.1:60828/axOQuzsu83M=/\n

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如果没有解决，则与您使用的扩展程序有关。

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• 请在此之后重新打开您的编辑器。但有时当您使用扩展时，这不起作用。

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• 我还检查了病毒防御者。并给予许可。

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Answer 2

要解决这个问题，请使用 API 28(Android 9) 的 Android 模拟器...

尝试一下并告诉我是否解决了您的问题...