質問編集履歴
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本文修正
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- FirebaseのFirestoreの値を削除する
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## 解決したいエラー
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ボタンをタップするとエラーが出てしまいます。
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```ここに言語を入力
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======== Exception caught by widgets library =======================================================
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-
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The following _CastError was thrown building Builder(dirty):
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Null check operator used on a null value
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The relevant error-causing widget was:
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MaterialApp MaterialApp:file:///Users/lukasekine/StudioProjects/flutter_tutorial_3/lib/presentation/main/main.dart:16:12
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When the exception was thrown, this was the stack:
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#0 BookListPage.build.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:flutter_tutorial_3/presentation/book_list/book_list_page.dart:81:31)
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#1 MaterialPageRoute.buildContent (package:flutter/src/material/page.dart:53:55)
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#2 MaterialRouteTransitionMixin.buildPage (package:flutter/src/material/page.dart:106:27)
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#3 _ModalScopeState.build.<anonymous closure>.<anonymous closure> (package:flutter/src/widgets/routes.dart:872:55)
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#4 Builder.build (package:flutter/src/widgets/basic.dart:7398:48)
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#5 StatelessElement.build (package:flutter/src/widgets/framework.dart:4827:28)
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#6 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4754:15)
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#7 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)
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#8 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4735:5)
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#9 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4729:5)
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... Normal element mounting (170 frames)
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#179 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3790:14)
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#180 MultiChildRenderObjectElement.inflateWidget (package:flutter/src/widgets/framework.dart:6422:36)
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#181 Element.updateChild (package:flutter/src/widgets/framework.dart:3540:18)
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#182 RenderObjectElement.updateChildren (package:flutter/src/widgets/framework.dart:5845:32)
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#183 MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6445:17)
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#184 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)
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#185 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)
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#186 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)
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#187 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)
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#188 StatefulElement.update (package:flutter/src/widgets/framework.dart:4960:5)
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#189 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)
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#190 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)
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#191 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)
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#192 ProxyElement.update (package:flutter/src/widgets/framework.dart:5108:5)
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#193 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)
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#194 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)
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#195 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)
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#196 ProxyElement.update (package:flutter/src/widgets/framework.dart:5108:5)
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#197 _InheritedNotifierElement.update (package:flutter/src/widgets/inherited_notifier.dart:111:11)
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#198 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)
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#199 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6291:14)
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#200 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)
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#201 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)
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#202 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)
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#203 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)
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#204 StatefulElement.update (package:flutter/src/widgets/framework.dart:4960:5)
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#205 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)
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#206 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6291:14)
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#207 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)
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#208 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6291:14)
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#209 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)
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#210 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)
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#211 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)
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#212 ProxyElement.update (package:flutter/src/widgets/framework.dart:5108:5)
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#213 Element.updateChild (package:flutter/src/widgets/framework.dart:3501:15)
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#214 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4780:16)
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#215 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4928:11)
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#216 Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)
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#217 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2659:19)
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#218 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:882:21)
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#219 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:363:5)
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#220 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1144:15)
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#221 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1081:9)
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#222 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:995:5)
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#226 _invoke (dart:ui/hooks.dart:151:10)
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#227 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:308:5)
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#228 _drawFrame (dart:ui/hooks.dart:115:31)
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(elided 3 frames from dart:async)
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```
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## 参考にしたもの(ほぼ丸パクしました)
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- https://www.youtube.com/watch?v=W0oKfFgoKpM&list=PLuLRJz1UnJzFrDuXT5FjsSUPmqD79kUpB&index=6
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- https://www.youtube.com/watch?v=q8jzhswdMyU&list=PLuLRJz1UnJz
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1
誤字脱字
test
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## 参考にしたもの(
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## 参考にしたもの(ほぼ丸パクしました)
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- https://www.youtube.com/watch?v=W0oKfFgoKpM&list=PLuLRJz1UnJzFrDuXT5FjsSUPmqD79kUpB&index=6
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- https://www.youtube.com/watch?v=q8jzhswdMyU&list=PLuLRJz1UnJz
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どのコード
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私のレベルではどのコードを共有したら適切な解決方法をいただけるかわからないため、私の共有アイテムにフォルダをzipファイルでアップしてあります。
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ご回答よろしくお願い致します。
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↓↓コードが格納されているフォルダ↓↓
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