How can I resolve the argument type error in gesture_detector_builder.dart related to TapDownDetails and TapDragDownDetails in Flutter?

Question

: Error: The argument type 'void Function(TapDownDetails)' can't be assigned to the parameter type 'void Function(TapDragDownDetails)?'.

• 'TapDownDetails' is from 'package:flutter/src/gestures/tap.dart' ('/C:/Flutter/flutter/packages/flutter/lib/src/gestures/tap.dart').
• 'TapDragDownDetails' is from 'package:flutter/src/widgets/tap_and_drag_gestures.dart' ('/C:/Flutter/flutter/packages/flutter/lib/src/widgets/tap_and_drag_gestures.dart'). onTapDown: onTapDown, ^ : Error: The argument type 'void Function(TapUpDetails)' can't be assigned to the parameter type 'void Function(TapDragUpDetails)?'.
• 'TapUpDetails' is from 'package:flutter/src/gestures/tap.dart' ('/C:/Flutter/flutter/packages/flutter/lib/src/gestures/tap.dart').
• 'TapDragUpDetails' is from 'package:flutter/src/widgets/tap_and_drag_gestures.dart' ('/C:/Flutter/flutter/packages/flutter/lib/src/widgets/tap_and_drag_gestures.dart'). onSingleTapUp: onSingleTapUp, ^ : Error: The argument type 'void Function(TapDownDetails)' can't be assigned to the parameter type 'void Function(TapDragDownDetails)?'.
• 'TapDownDetails' is from 'package:flutter/src/gestures/tap.dart' ('/C:/Flutter/flutter/packages/flutter/lib/src/gestures/tap.dart').
• 'TapDragDownDetails' is from 'package:flutter/src/widgets/tap_and_drag_gestures.dart' ('/C:/Flutter/flutter/packages/flutter/lib/src/widgets/tap_and_drag_gestures.dart'). onDoubleTapDown: onDoubleTapDown, ^ : Error: The argument type 'void Function(DragStartDetails)' can't be assigned to the parameter type 'void Function(TapDragStartDetails)?'.
• 'DragStartDetails' is from 'package:flutter/src/gestures/drag_details.dart' ('/C:/Flutter/flutter/packages/flutter/lib/src/gestures/drag_details.dart').
• 'TapDragStartDetails' is from 'package:flutter/src/widgets/tap_and_drag_gestures.dart' ('/C:/Flutter/flutter/packages/flutter/lib/src/widgets/tap_and_drag_gestures.dart'). onDragSelectionStart: onDragSelectionStart, ^ : Error: The argument type 'void Function(DragStartDetails, DragUpdateDetails)' can't be assigned to the parameter type 'void Function(TapDragUpdateDetails)?'.
• 'DragStartDetails' is from 'package:flutter/src/gestures/drag_details.dart' ('/C:/Flutter/flutter/packages/flutter/lib/src/gestures/drag_details.dart').
• 'DragUpdateDetails' is from 'package:flutter/src/gestures/drag_details.dart' ('/C:/Flutter/flutter/packages/flutter/lib/src/gestures/drag_details.dart').
• 'TapDragUpdateDetails' is from 'package:flutter/src/widgets/tap_and_drag_gestures.dart' ('/C:/Flutter/flutter/packages/flutter/lib/src/widgets/tap_and_drag_gestures.dart'). onDragSelectionUpdate: onDragSelectionUpdate, ^ : Error: The argument type 'void Function(DragEndDetails)' can't be assigned to the parameter type 'void Function(TapDragEndDetails)?'.
• 'DragEndDetails' is from 'package:flutter/src/gestures/drag_details.dart' ('/C:/Flutter/flutter/packages/flutter/lib/src/gestures/drag_details.dart').
• 'TapDragEndDetails' is from 'package:flutter/src/widgets/tap_and_drag_gestures.dart' ('/C:/Flutter/flutter/packages/flutter/lib/src/widgets/tap_and_drag_gestures.dart'). onDragSelectionEnd: onDragSelectionEnd, ^

FAILURE: Build failed with an exception.

• Where: Script 'C:\Flutter\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 1201
• What went wrong: Execution failed for task ':app:compileFlutterBuildDebug'.

Process 'command 'C:\Flutter\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 50s E/AndroidRuntime(29997): FATAL EXCEPTION: ScreenDecorations E/AndroidRuntime(29997): Process: com.android.systemui, PID: 29997 E/AndroidRuntime(29997): java.lang.NullPointerException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkNotNullParameter, parameter bottomLeft E/AndroidRuntime(29997): at com.android.systemui.statusbar.events.PrivacyDotViewController.initialize(Unknown Source:22) E/AndroidRuntime(29997): at com.android.systemui.ScreenDecorations.setupDecorations(ScreenDecorations.java:315) E/AndroidRuntime(29997): at com.android.systemui.ScreenDecorations.startOnScreenDecorationsThread(ScreenDecorations.java:252) E/AndroidRuntime(29997): at com.android.systemui.ScreenDecorations.$r8$lambda$bRx4s-frKyGv-SmpobluoualBbQ(Unknown Source:0) E/AndroidRuntime(29997): at com.android.systemui.ScreenDecorations$$ExternalSyntheticLambda2.run(Unknown Source:2) E/AndroidRuntime(29997): at android.os.Handler.handleCallback(Handler.java:938) E/AndroidRuntime(29997): at android.os.Handler.dispatchMessage(Handler.java:99) E/AndroidRuntime(29997): at android.os.Looper.loopOnce(Looper.java:201) E/AndroidRuntime(29997): at android.os.Looper.loop(Looper.java:288) E/AndroidRuntime(29997): at android.os.HandlerThread.run(HandlerThread.java:67) Exception: Gradle task assembleDebug failed with exit code 1 Exited (sigterm)

I wanted to update my application so I just updated the packages along with flutter.After which when I run it, throws the above errors. Here's my pubspec.yaml packages: http: ^1.0.0 webfeed: 0.7.0 xml: ^5.4.1 cupertino_icons: 1.0.5 flutter_launcher_icons: ^0.11.0 shared_preferences: ^2.1.1 share: 2.0.4 launch_review: 3.0.1 url_launcher: ^6.1.11 fluttertoast: ^8.2.2 font_awesome_flutter: 10.4.0 webview_flutter: ^2.3.4 flutter_html: 2.2.1 percent_indicator: 4.2.3 page_indicator: ^0.4.1 admob_flutter: ^3.0.0 flutter_local_notifications: ^12.0.4

Answer 1

I faced this error after upgrading Flutter to version 3.10.4. The issue lies with the flutter_html package. It depends on the flutter_math_fork 0.5.0 which throws the Gesture_detector error. Once I replaced the flutter_html with a different HTML rendering package the error was resolved