相关疑难解决方法(0)

我为管理员登录编写的代码：

import \'package:cloud_firestore/cloud_firestore.dart\';\nimport \'package:flutter/material.dart\';\n\nclass FirebaseServices {\n  static Future<DocumentSnapshot> adminSignIn(id) async {\n    var res =\n        await FirebaseFirestore.instance.collection("admin").doc(id).get();\n    return res;\n  }\n}\n

我收到的错误如下：

import \'package:cloud_firestore/cloud_firestore.dart\';\nimport \'package:flutter/material.dart\';\n\nclass FirebaseServices {\n  static Future<DocumentSnapshot> adminSignIn(id) async {\n    var res =\n        await FirebaseFirestore.instance.collection("admin").doc(id).get();\n    return res;\n  }\n}\n

您还可以访问该项目的存储库。

我试着跑flutter doctor -v。进而：

+ ChromeProxyService: Failed to evaluate expression \n \'handlePrimaryPointer\':InternalError: No frame with index 45.\n+ ChromeProxyService: Failed to evaluate expression\n \'postAcceptSlopTolerance\': InternalError: No frame with index 45.\n+ ChromeProxyService: Failed to …

通常，当从列表渲染时，我会看到 Flutter 抛出以下内容，从下面的示例中，请参阅 PositionedTilesState：

ChromeProxyService: Failed to evaluate expression 'tiles'. 
ChromeProxyService: Failed to evaluate expression '[     '. 
ChromeProxyService: Failed to evaluate expression 'StatelessColorfulTile'. 
ChromeProxyService: Failed to evaluate expression 'PositionedTilesState'. 

您看到这个并找到解决方案了吗？

例子：

import 'package:flutter/material.dart';
import 'package:example/dart/concepts/color/unique_color_generator.dart';

// PositionedTiles
class PositionedTiles extends StatefulWidget {
  final String? title;
  const PositionedTiles({Key? key, required this.title}) : super(key: key);

  @override
  State<StatefulWidget> createState() => PositionedTilesState();
}

// PositionedTilesState
class PositionedTilesState extends State<PositionedTiles> {
  List<Widget> tiles = [
    StatelessColorfulTile(),
    StatelessColorfulTile(),
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold( …