已关闭的 Dismissible 小部件仍然是 flutter 中树的一部分

我有一个待办事项应用程序，它使用provider用于状态管理和sqlite数据库。

在应用程序中我试图添加Dismissible用于删除项目的小部件。

但问题是当我尝试删除项目时它确实被删除了database但我在屏幕上收到错误。我是颤振的新手。

控制台中出现错误。

════════ Exception caught by widgets library ═══════════════════════════════════════════════════════
The following assertion was thrown building Dismissible-[<'howll'>](dirty, dependencies: [Directionality], state: _DismissibleState#98163(tickers: tracking 2 tickers)):
A dismissed Dismissible widget is still part of the tree.

Make sure to implement the onDismissed handler and to immediately remove the Dismissible
widget from the application once that handler has fired.
User-created ancestor of the error-causing widget was: 
  TaskListTile file:///C:/Users/adity/Desktop/flutter-app/todoye/lib/widgets/task_list_view.dart:14:22
When the exception was thrown, this was the stack: 
#0      _DismissibleState.build.<anonymous closure> (package:flutter/src/widgets/dismissible.dart:526:11)
#1      _DismissibleState.build (package:flutter/src/widgets/dismissible.dart:533:8)
#2      StatefulElement.build (package:flutter/src/widgets/framework.dart:4047:27)
#3      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3941:15)
#4      Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
...

这是我的代码。

任务列表图块.dart

Dismissible(
      key: Key(taskTitle),
      onDismissed: (direction) {
        deleteCallback();
        Scaffold.of(context)
            .showSnackBar(SnackBar(content: Text("$taskTitle removed.")));
      },
      child: ListTile(
           title: Text(
          '$taskTitle',  
        ),

任务数据.dart

void deleteTask(int id) {
    taskDatabaseManager.deleteTask(id);
    notifyListeners();
  }

数据库连接.dart

Future<void> deleteTask(int id) async {
    await openDb();
    await _database.delete(
      'tasks',
      where: 'id = ?',
      whereArgs: [id],
    );
  }

任务列表视图.dart

class TaskListView extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Consumer<TaskData>(
      builder: (context, taskData, child) {
        return ListView.builder(
            itemCount: taskData.taskCount,
            itemBuilder: (context, index) {
              return TaskListTile(
                taskTitle: taskData.tasks[index].name,
                isChecked: taskData.tasks[index].isDone,
                checkboxCallback: (checkboxState) {
                  taskData.updateTask(taskData.tasks[index]);
                },
                deleteCallback: () {
                  taskData.deleteTask(taskData.tasks[index].id);
                },
              );
            });
      },
    );
  }
}

如果您确定您的可关闭小部件已被删除。尝试修复key。 密钥应该是唯一的。如果任务的id是唯一的，

key: Key(taskData.tasks[index].id)

如果您没有任何其他恒定且独特的数据，您可以尝试

key: UniqueKey()