FlutterDart - 未处理的异常：类型'String'不是'index'的类型'int'的子类型。

问题描述 投票：0回答：1

我是Flutter的初学者，目前正在跟着教程搭建一个任务计划器(https:/www.youtube.comwatch?v=xJSestoFlJ8&list=PLF9bFmu3NqWqchwS3DO9MDSl15IiHQWcr&index=9。)

在手工重写了代码（数据库等）后，当我重新启动app在调试控制台中显示我保存到数据库中的项目时，我得到了一个错误，说在使用initstate和setstate工作时

Unhandled Exception: type 'String' is not a subtype of type 'int' of 'index'

以下是与该错误相关的代码

final TextEditingController _textEditingController = TextEditingController();
  var db = DatabaseHelper();

  @override
  void initState() {
    super.initState();

    _readTaskList();
  }

  void _handleSubmitted(String text) async {
    _textEditingController.clear();

    Tasks tasksItem = Tasks(text, DateTime.now().toIso8601String());
    int savedItemId = await db.saveItem(tasksItem);

    print("Item saved ID: $savedItemId");

  }

_readTaskList() async {
    List items = await db.getItems();
    items.forEach((item) {
      Tasks tasksItem = Tasks.map(items);
      print("DB Items: ${tasksItem.itemName}");
    });
  }

这里是完整的调试控制台日志

E/flutter ( 8249): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: type 'String' is not a subtype of type 'int' of 'index'
E/flutter ( 8249): #0      new Tasks.map 
package:gatorblocks_rbt/models/tasks.dart:12
E/flutter ( 8249): #1      _TaskPlannerState._readTaskList.<anonymous closure> 
package:gatorblocks_rbt/pages/taskPlanner.dart:105
E/flutter ( 8249): #2      List.forEach  (dart:core-patch/growable_array.dart:285:8)
E/flutter ( 8249): #3      _TaskPlannerState._readTaskList 
package:gatorblocks_rbt/pages/taskPlanner.dart:104
E/flutter ( 8249): <asynchronous suspension>
E/flutter ( 8249): #4      _TaskPlannerState.initState 
package:gatorblocks_rbt/pages/taskPlanner.dart:24
E/flutter ( 8249): #5      StatefulElement._firstBuild 
package:flutter/…/widgets/framework.dart:4355
E/flutter ( 8249): #6      ComponentElement.mount 
package:flutter/…/widgets/framework.dart:4201
E/flutter ( 8249): #7      Element.inflateWidget 
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #8      Element.updateChild 
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #9      SingleChildRenderObjectElement.mount 
package:flutter/…/widgets/framework.dart:5445
E/flutter ( 8249): #10     Element.inflateWidget 
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #11     Element.updateChild 
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #12     ComponentElement.performRebuild 
package:flutter/…/widgets/framework.dart:4243
E/flutter ( 8249): #13     Element.rebuild 
package:flutter/…/widgets/framework.dart:3947
E/flutter ( 8249): #14     ComponentElement._firstBuild 
package:flutter/…/widgets/framework.dart:4206
E/flutter ( 8249): #15     ComponentElement.mount 
package:flutter/…/widgets/framework.dart:4201
E/flutter ( 8249): #16     Element.inflateWidget 
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #17     Element.updateChild 
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #18     SingleChildRenderObjectElement.mount 
package:flutter/…/widgets/framework.dart:5445
E/flutter ( 8249): #19     Element.inflateWidget 
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #20     Element.updateChild 
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #21     SingleChildRenderObjectElement.mount 
package:flutter/…/widgets/framework.dart:5445
E/flutter ( 8249): #22     Element.inflateWidget 
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #23     Element.updateChild 
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #24     ComponentElement.performRebuild 
package:flutter/…/widgets/framework.dart:4243
E/flutter ( 8249): #25     Element.rebuild 
package:flutter/…/widgets/framework.dart:3947
E/flutter ( 8249): #26     ComponentElement._firstBuild 
package:flutter/…/widgets/framework.dart:4206
E/flutter ( 8249): #27     StatefulElement._firstBuild 
package:flutter/…/widgets/framework.dart:4381
E/flutter ( 8249): #28     ComponentElement.mount 
package:flutter/…/widgets/framework.dart:4201
E/flutter ( 8249): #29     Element.inflateWidget 
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #30     Element.updateChild 
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #31     SingleChildRenderObjectElement.mount 
package:flutter/…/widgets/framework.dart:5445
E/flutter ( 8249): #32     Element.inflateWidget 
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #33     Element.updateChild 
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #34     SingleChildRenderObjectElement.mount 
package:flutter/…/widgets/framework.dart:5445
E/flutter ( 8249): #35     Element.inflateWidget 
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #36     Element.updateChild 
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #37     ComponentElement.performRebuild 
package:flutter/…/widgets/framework.dart:4243
E/flutter ( 8249): #38     Element.rebuild 
package:flutter/…/widgets/framework.dart:3947
E/flutter ( 8249): #39     ComponentElement._firstBuild 
package:flutter/…/widgets/framework.dart:4206
E/flutter ( 8249): #40     StatefulElement._firstBuild 
package:flutter/…/widgets/framework.dart:4381
E/flutter ( 8249): #41     ComponentElement.mount 
package:flutter/…/widgets/framework.dart:4201
E/flutter ( 8249): #42     Element.inflateWidget 
package:flutter/…/widgets/framework.dart:3194
E/flutter ( 8249): #43     Element.updateChild 
package:flutter/…/widgets/framework.dart:2988
E/flutter ( 8249): #44     ComponentElement.performRebuild 
package:flutter/…/widgets/framework.dart:4243
E/flutter ( 8249): #45     Element.rebuild (package:flutte

下面是一个截图

这个应用工作得非常好，它不会崩溃或任何东西，只是无法正确显示我保存到数据库中的项目。

flutter dart unhandled-exception sqflite
1个回答
0
投票

你得到这个错误是因为你把一个 int 变成 Text 小部件，接受一个 String.

你可以通过使用该函数将int转换为 toString() 方法。

检查下面的代码。用你的 handleSubmitted 功能。

  void _handleSubmitted(String text) async {
    _textEditingController.clear();

    Tasks tasksItem = Tasks(text, DateTime.now().toIso8601String());
    int savedItemId = await db.saveItem(tasksItem);

    // convert savedItemId to a string using toString() method
    print("Item saved ID: $savedItemId.toString()");

  }

希望对你有所帮助

已更新在查看了你的代码后，我可以看到你正在尝试访问字段 id 你没有在你的 Tasks 构造函数.为什么你会得到错误。Type String is not a subtype of int index

希望这能解决你的错误。

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