Flutter MissingPluginException error - PullRequest
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Flutter MissingPluginException error

0 голосов
/ 20 мая 2018

Я пытаюсь запустить приложение для чтения QR-кодов на своем S7 Edge (Android 7) через Flutter в Android Studio.

Вот ссылка на код для примера: https://pub.dartlang.org/packages/qrcode_reader#-example-tab-

Когда я запускаю приложение, оно появляется на моем телефоне, но если я нажимаю на кнопку, это дает мне этот вывод (включая меня, пытающийся нажать кнопку сканирования несколько раз безрезультатно):

ПОЖАЛУЙСТА, ПРОЧИТАЙТЕРЕДАКТИРОВАТЬ НИЖЕ 

E/flutter (31215): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter (31215): MissingPluginException(No implementation found for method readQRCode on channel qrcode_reader)
E/flutter (31215): #0      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:278:7)
E/flutter (31215): <asynchronous suspension>
E/flutter (31215): #1      QRCodeReader.scan (package:qrcode_reader/QRCodeReader.dart:67:27)
E/flutter (31215): <asynchronous suspension>
E/flutter (31215): #2      _MyHomePageState.build.<anonymous closure>.<anonymous closure> (file:///C:/Users/x/AndroidStudioProjects/qr_cod
E/lib/main.dart:56:10)
E/flutter (31215): #3      State.setState (package:flutter/src/widgets/framework.dart:1117:30)
E/flutter (31215): #4      _MyHomePageState.build.<anonymous closure> (file:///C:/Users/x/AndroidStudioProjects/qr_cod
E/lib/main.dart:49:6)
E/flutter (31215): #5      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:494:14)
E/flutter (31215): #6      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:549:30)
E/flutter (31215): #7      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
E/flutter (31215): #8      TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:161:9)
E/flutter (31215): #9      TapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:94:7)
E/flutter (31215): #10     PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:315:9)
E/flutter (31215): #11     PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:73:12)
E/flutter (31215): #12     PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:101:11)
E/flutter (31215): #13     _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:143:19)
E/flutter (31215): #14     _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:121:22)
E/flutter (31215): #15     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:101:7)
E/flutter (31215): #16     _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:64:7)
E/flutter (31215): #17     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:48:7)
E/flutter (31215): #18     _invoke1 (dart:ui/hooks.dart:134:13)
E/flutter (31215): #19     _dispatchPointerDataPacket (dart:ui/hooks.dart:91:5)
D/ViewRootImpl@526fccd[MainActivity](31215): ViewPostImeInputStage processPointer 0
D/ViewRootImpl@526fccd[MainActivity](31215): ViewPostImeInputStage processPointer 1
E/flutter (31215): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter (31215): MissingPluginException(No implementation found for method readQRCode on channel qrcode_reader)
E/flutter (31215): #0      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:278:7)
E/flutter (31215): <asynchronous suspension>
E/flutter (31215): #1      QRCodeReader.scan (package:qrcode_reader/QRCodeReader.dart:67:27)
E/flutter (31215): <asynchronous suspension>
E/flutter (31215): #2      _MyHomePageState.build.<anonymous closure>.<anonymous closure> (file:///C:/Users/x/AndroidStudioProjects/qr_cod
E/lib/main.dart:56:10)
E/flutter (31215): #3      State.setState (package:flutter/src/widgets/framework.dart:1117:30)
E/flutter (31215): #4      _MyHomePageState.build.<anonymous closure> (file:///C:/Users/x/AndroidStudioProjects/qr_cod
E/lib/main.dart:49:6)
E/flutter (31215): #5      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:494:14)
E/flutter (31215): #6      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:549:30)
E/flutter (31215): #7      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
E/flutter (31215): #8      TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:161:9)
E/flutter (31215): #9      TapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:94:7)
E/flutter (31215): #10     PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:315:9)
E/flutter (31215): #11     PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:73:12)
E/flutter (31215): #12     PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:101:11)
E/flutter (31215): #13     _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:143:19)
E/flutter (31215): #14     _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:121:22)
E/flutter (31215): #15     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:101:7)
E/flutter (31215): #16     _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:64:7)
E/flutter (31215): #17     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:48:7)
E/flutter (31215): #18     _invoke1 (dart:ui/hooks.dart:134:13)
E/flutter (31215): #19     _dispatchPointerDataPacket (dart:ui/hooks.dart:91:5)
D/ViewRootImpl@526fccd[MainActivity](31215): ViewPostImeInputStage processPointer 0
D/ViewRootImpl@526fccd[MainActivity](31215): ViewPostImeInputStage processPointer 1
E/flutter (31215): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter (31215): MissingPluginException(No implementation found for method readQRCode on channel qrcode_reader)
E/flutter (31215): #0      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:278:7)
E/flutter (31215): <asynchronous suspension>
E/flutter (31215): #1      QRCodeReader.scan (package:qrcode_reader/QRCodeReader.dart:67:27)
E/flutter (31215): <asynchronous suspension>
E/flutter (31215): #2      _MyHomePageState.build.<anonymous closure>.<anonymous closure> (file:///C:/Users/x/AndroidStudioProjects/qr_cod
E/lib/main.dart:56:10)
E/flutter (31215): #3      State.setState (package:flutter/src/widgets/framework.dart:1117:30)
E/flutter (31215): #4      _MyHomePageState.build.<anonymous closure> (file:///C:/Users/x/AndroidStudioProjects/qr_cod
E/lib/main.dart:49:6)
E/flutter (31215): #5      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:494:14)
E/flutter (31215): #6      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:549:30)
E/flutter (31215): #7      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
E/flutter (31215): #8      TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:161:9)
E/flutter (31215): #9      TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:123:7)
E/flutter (31215): #10     GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
E/flutter (31215): #11     _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:147:20)
E/flutter (31215): #12     _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:121:22)
E/flutter (31215): #13     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:101:7)
E/flutter (31215): #14     _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:64:7)
E/flutter (31215): #15     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:48:7)
E/flutter (31215): #16     _invoke1 (dart:ui/hooks.dart:134:13)
E/flutter (31215): #17     _dispatchPointerDataPacket (dart:ui/hooks.dart:91:5)
D/ViewRootImpl@526fccd[MainActivity](31215): ViewPostImeInputStage processPointer 0
D/ViewRootImpl@526fccd[MainActivity](31215): ViewPostImeInputStage processPointer 1
E/flutter (31215): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter (31215): MissingPluginException(No implementation found for method readQRCode on channel qrcode_reader)
E/flutter (31215): #0      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:278:7)
E/flutter (31215): <asynchronous suspension>
E/flutter (31215): #1      QRCodeReader.scan (package:qrcode_reader/QRCodeReader.dart:67:27)
E/flutter (31215): <asynchronous suspension>
E/flutter (31215): #2      _MyHomePageState.build.<anonymous closure>.<anonymous closure> (file:///C:/Users/x/AndroidStudioProjects/qr_cod
E/lib/main.dart:56:10)
E/flutter (31215): #3      State.setState (package:flutter/src/widgets/framework.dart:1117:30)
E/flutter (31215): #4      _MyHomePageState.build.<anonymous closure> (file:///C:/Users/x/AndroidStudioProjects/qr_cod
E/lib/main.dart:49:6)
E/flutter (31215): #5      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:494:14)
E/flutter (31215): #6      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:549:30)
E/flutter (31215): #7      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
E/flutter (31215): #8      TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:161:9)
E/flutter (31215): #9      TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:123:7)
E/flutter (31215): #10     GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
E/flutter (31215): #11     _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:147:20)
E/flutter (31215): #12     _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:121:22)
E/flutter (31215): #13     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:101:7)
E/flutter (31215): #14     _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:64:7)
E/flutter (31215): #15     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:48:7)
E/flutter (31215): #16     _invoke1 (dart:ui/hooks.dart:134:13)
E/flutter (31215): #17     _dispatchPointerDataPacket (dart:ui/hooks.dart:91:5)
D/ViewRootImpl@526fccd[MainActivity](31215): ViewPostImeInputStage processPointer 0
D/ViewRootImpl@526fccd[MainActivity](31215): ViewPostImeInputStage processPointer 1
D/ViewRootImpl@526fccd[MainActivity](31215): ViewPostImeInputStage processPointer 0
D/ViewRootImpl@526fccd[MainActivity](31215): ViewPostImeInputStage processPointer 1
D/ViewRootImpl@526fccd[MainActivity](31215): ViewPostImeInputStage processPointer 0
D/ViewRootImpl@526fccd[MainActivity](31215): ViewPostImeInputStage processPointer 1
E/flutter (31215): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter (31215): MissingPluginException(No implementation found for method readQRCode on channel qrcode_reader)
E/flutter (31215): #0      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:278:7)
E/flutter (31215): <asynchronous suspension>
E/flutter (31215): #1      QRCodeReader.scan (package:qrcode_reader/QRCodeReader.dart:67:27)
E/flutter (31215): <asynchronous suspension>
E/flutter (31215): #2      _MyHomePageState.build.<anonymous closure>.<anonymous closure> (file:///C:/Users/x/AndroidStudioProjects/qr_cod
E/lib/main.dart:56:10)
E/flutter (31215): #3      State.setState (package:flutter/src/widgets/framework.dart:1117:30)
E/flutter (31215): #4      _MyHomePageState.build.<anonymous closure> (file:///C:/Users/x/AndroidStudioProjects/qr_cod
E/lib/main.dart:49:6)
E/flutter (31215): #5      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:494:14)
E/flutter (31215): #6      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:549:30)
E/flutter (31215): #7      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
E/flutter (31215): #8      TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:161:9)
E/flutter (31215): #9      TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:123:7)
E/flutter (31215): #10     GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
E/flutter (31215): #11     _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:147:20)
E/flutter (31215): #12     _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:121:22)
E/flutter (31215): #13     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:101:7)
E/flutter (31215): #14     _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:64:7)
E/flutter (31215): #15     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:48:7)
E/flutter (31215): #16     _invoke1 (dart:ui/hooks.dart:134:13)
E/flutter (31215): #17     _dispatchPointerDataPacket (dart:ui/hooks.dart:91:5)

РЕДАКТИРОВАТЬ:

Я перезагружал свой компьютер, чтобы посмотреть, была ли это проблема, поскольку я только что установил Android Studio на этот компьютер.Теперь, когда я запускаю проект, я получаю эту ошибку 

C:\Users\x\Documents\Coding\Flutter\SDK\flutter\.pub-cache\hosted\pub.dartlang.org\qrcode_reader-0.3.3\android\src\main\java\com\matheusvillela\flutter\plugins\qrcodereader\QRCodeReaderPlugin.java:42: error: cannot find symbol public class QRCodeReaderPlugin implements MethodCallHandler, ActivityResultListener, PluginRegistry.RequestPermissionResultListener {
                                                                                                    ^   symbol:   class RequestPermissionResultListener   location: interface PluginRegistry C:\Users\x\Documents\Coding\Flutter\SDK\flutter\.pub-cache\hosted\pub.dartlang.org\qrcode_reader-0.3.3\android\src\main\java\com\matheusvillela\flutter\plugins\qrcodereader\QRCodeReaderPlugin.java:63: error: incompatible types: QRCodeReaderPlugin cannot be converted to RequestPermissionsResultListener
            registrar.addRequestPermissionsResultListener(instance);
                                                          ^ C:\Users\x\Documents\Coding\Flutter\SDK\flutter\.pub-cache\hosted\pub.dartlang.org\qrcode_reader-0.3.3\android\src\main\java\com\matheusvillela\flutter\plugins\qrcodereader\QRCodeReaderPlugin.java:155: error: method does not override or implement a method from a supertype
    @Override
    ^ Note: C:\Users\x\Documents\Coding\Flutter\SDK\flutter\.pub-cache\hosted\pub.dartlang.org\qrcode_reader-0.3.3\android\src\main\java\com\matheusvillela\flutter\plugins\qrcodereader\QRCodeReaderPlugin.java uses unchecked or unsafe operations. Note: Recompile with
-Xlint:unchecked for details. Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output 3 errors

FAILURE: Build failed with an exception.

* What went wrong: Execution failed for task ':qrcode_reader:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

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

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

BUILD FAILED in 2s Finished with error: Gradle build failed: 1

1 Ответ

0 голосов
/ 19 июня 2018

После добавления оператора плагина в файл pubspec.yaml необходимо выполнить команду flutter packages get.

Кроме того, вы также можете сначала попробовать flutter upgrade.Затем проверьте вывод вашего доктора по флаттеру.

Иногда я также переключаю канал флаттера, чтобы не было ошибок.Измените канал флаттера, введя Flutter channel XXX, где XXX равно dev, master или beta.

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