Closure call with mismatched arguments: function '_TasksListState.build..' Receiver: Closure: (bool) => Null

Question

task_list.dart

import 'package:flutter/material.dart';
import 'package:todoey_app/widgets/task_tile.dart';
import 'package:todoey_app/models/task.dart';

class TasksList extends StatefulWidget {
  @override
  State<TasksList> createState() => _TasksListState();
}

class _TasksListState extends State<TasksList> {
  List<Task> tasks = [
    Task(name: 'Buy milk'),
    Task(name: 'Buy eggs'),
    Task(name: 'Buy bread'),
  ];

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemBuilder: (context, index) {
        return TaskTile(
            taskTitle: tasks[index].name,
            isChecked: tasks[index].isDone,
            checkboxCallback: (bool checkboxState) {
              setState(() {
                tasks[index].toggleDone();
              });
            });
      },
      itemCount: tasks.length,
    );
  }
}

task_tile.dart

import 'package:flutter/material.dart';

class TaskTile extends StatelessWidget {
  late final bool isChecked;
  late final String taskTitle;
  final Function checkboxCallback;

  TaskTile(
      {required this.isChecked,
      required this.taskTitle,
      required this.checkboxCallback});

  @override
  Widget build(BuildContext context) {
    return ListTile(
      title: Text(
        taskTitle,
        style: TextStyle(
            decoration: isChecked ? TextDecoration.lineThrough : null),
      ),
      trailing: Checkbox(
        activeColor: Colors.lightBlueAccent,
        value: isChecked,
        onChanged: checkboxCallback(),
        // onChanged: toggleCheckboxState(),
      ),
    );
  }
}

enter image description here

Inside the checkbox in on changed property is not working with the check box call back method. Do you know what i have done wrong here? As per my online instructor it was working on her older version of dart but seems it's not working now in the latest version.

Answer 1

Using onChanged: checkboxCallback() will call the method while building frame, you can use onChanged: checkboxCallback, and it will get calls when the item will be get changed.