[RESOLVIDO] Livro Flutter Framework - Capítulo 7 - Exemplo do QR Code não roda

Livros
1

Estou lendo o livro Iniciando com Flutter Framework - Desenvolva aplicações móveis no Dart Side! e acompanhando os exemplos, mas ao chegar no Capítulo 7 - Dependências, não está rodando o exemplo.
Estou testando usando um smartphone com Android 7.1.2. O aplicativo abre mas quando clico no botão “Ler QR Code” não acontece nada e o console não apresenta nenhum erro.

Como resolver esse problema?

2

Fiz o mesmo exemplo da documentação do plugin (https://pub.dev/packages/qrcode_reader/example). A câmera não abre, mas aparecem informações no console:

I/ViewRootImpl(28043): ViewRoot's Touch Event : ACTION_DOWN
I/ViewRootImpl(28043): ViewRoot's Touch Event : ACTION_UP
E/flutter (28043): [ERROR:flutter/lib/ui/ui_dart_state.cc(166)] Unhandled Exception:     
MissingPluginException(No implementation found for method readQRCode on channel  qrcode_reader)
e[38;5;244mE/flutter (28043): #0      MethodChannel._invokeMethode[39;49m
E/flutter (28043): <asynchronous suspension>
e[38;5;244mE/flutter (28043): #1      MethodChannel.invokeMethode[39;49m
e[38;5;248mE/flutter (28043): #2      QRCodeReader.scane[39;49m
e[38;5;248mE/flutter (28043): #3      _MyHomePageState.build.<anonymous closure>.  <anonymous closure>e[39;49m
e[38;5;244mE/flutter (28043): #4      State.setStatee[39;49m
e[38;5;248mE/flutter (28043): #5      _MyHomePageState.build.<anonymous closure>e  [39;49m
e[38;5;244mE/flutter (28043): #6      _InkResponseState._handleTape[39;49m
e[38;5;244mE/flutter (28043): #7      _InkResponseState.build.<anonymous closure>e[39;49m
e[38;5;244mE/flutter (28043): #8      GestureRecognizer.invokeCallbacke[39;49m
e[38;5;244mE/flutter (28043): #9      TapGestureRecognizer.handleTapUpe[39;49m
e[38;5;244mE/flutter (28043): #10     BaseTapGestureRecognizer._checkUpe[39;49m
e[38;5;244mE/flutter (28043): #11     BaseTapGestureRecognizer.acceptGesturee[39;49m
e[38;5;244mE/flutter (28043): #12     GestureArenaManager.sweepe[39;49m
e[38;5;244mE/flutter (28043): #13     GestureBinding.handleEvente[39;49m
e[38;5;244mE/flutter (28043): #14     GestureBinding.dispatchEvente[39;49m
e[38;5;244mE/flutter (28043): #15     GestureBinding._handlePointerEvente[39;49m
e[38;5;244mE/flutter (28043): #16     GestureBinding._flushPointerEventQueuee[39;49m
e[38;5;244mE/flutter (28043): #17     GestureBinding._handlePointerDataPackete[39;49m
e[38;5;244mE/flutter (28043): #18     _rootRunUnary  (dart:async/zone.dart:1206:13)e [39;49m
e[38;5;244mE/flutter (28043): #19     _CustomZone.runUnary   (dart:async/zone.dart:1100:19)e[39;49m
e[38;5;244mE/flutter (28043): #20     _CustomZone.runUnaryGuarded  (dart:async/zone.dart:1005:7)e[39;49m
e[38;5;244mE/flutter (28043): #21     _invoke1  (dart:ui/hooks.dart:267:10)e[39;49m
e[38;5;244mE/flutter (28043): #22     _dispatchPointerDataPacket  (dart:ui/hooks.dart:176:5)e[39;49m
E/flutter (28043):
I/ViewRootImpl(28043): ViewRoot's Touch Event : ACTION_DOWN
I/ViewRootImpl(28043): ViewRoot's Touch Event : ACTION_UP
E/flutter (28043): [ERROR:flutter/lib/ui/ui_dart_state.cc(166)] Unhandled Exception:    MissingPluginException(No implementation found for method readQRCode on channel qrcode_reader)
e[38;5;244mE/flutter (28043): #0      MethodChannel._invokeMethode[39;49m
E/flutter (28043): <asynchronous suspension>
e[38;5;244mE/flutter (28043): #1      MethodChannel.invokeMethode[39;49m
e[38;5;248mE/flutter (28043): #2      QRCodeReader.scane[39;49m
e[38;5;248mE/flutter (28043): #3      _MyHomePageState.build.<anonymous closure>.<anonymous closure>e[39;49m
e[38;5;244mE/flutter (28043): #4      State.setStatee[39;49m
e[38;5;248mE/flutter (28043): #5      _MyHomePageState.build.<anonymous closure>e[39;49m
e[38;5;244mE/flutter (28043): #6      _InkResponseState._handleTape[39;49m
e[38;5;244mE/flutter (28043): #7      _InkResponseState.build.<anonymous closure>e[39;49m
e[38;5;244mE/flutter (28043): #8      GestureRecognizer.invokeCallbacke[39;49m
e[38;5;244mE/flutter (28043): #9      TapGestureRecognizer.handleTapUpe[39;49m
e[38;5;244mE/flutter (28043): #10     BaseTapGestureRecognizer._checkUpe[39;49m
e[38;5;244mE/flutter (28043): #11     BaseTapGestureRecognizer.acceptGesturee[39;49m
e[38;5;244mE/flutter (28043): #12     GestureArenaManager.sweepe[39;49m
e[38;5;244mE/flutter (28043): #13     GestureBinding.handleEvente[39;49m
e[38;5;244mE/flutter (28043): #14     GestureBinding.dispatchEvente[39;49m
e[38;5;244mE/flutter (28043): #15     GestureBinding._handlePointerEvente[39;49m
e[38;5;244mE/flutter (28043): #16     GestureBinding._flushPointerEventQueuee[39;49m
e[38;5;244mE/flutter (28043): #17     GestureBinding._handlePointerDataPackete[39;49m
e[38;5;244mE/flutter (28043): #18     _rootRunUnary  (dart:async/zone.dart:1206:13)e[39;49m
e[38;5;244mE/flutter (28043): #19     _CustomZone.runUnary  (dart:async/zone.dart:1100:19)e[39;49m
e[38;5;244mE/flutter (28043): #20     _CustomZone.runUnaryGuarded  (dart:async/zone.dart:1005:7)e[39;49m
e[38;5;244mE/flutter (28043): #21     _invoke1  (dart:ui/hooks.dart:267:10)e[39;49m
e[38;5;244mE/flutter (28043): #22     _dispatchPointerDataPacket  (dart:ui/hooks.dart:176:5)e[39;49m
E/flutter (28043):
3

Rodei o projeto do GitHub do livro e funcinou.