我正在尝试将我的 Flutter 应用程序与 cloud_firestore 连接起来。但是当我运行代码时,它给出了与服务绑定相关的错误。为了克服这个问题,我使用了 WidgetsFlutterBinding.ensureInitialized()。使用后,同样出现以下错误。
Error: Property 'defaultBinaryMessenger' cannot be accessed on 'ServicesBinding?' because it is potentially null.
- 'ServicesBinding' is from 'package:flutter/src/services/binding.dart' ('/C:/src/flutter/packages/flutter/lib/src/services/binding.dart').
Try accessing using ?. instead.
_binaryMessenger ?? ServicesBinding.instance.defaultBinaryMessenger;
下面是我的代码:
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
// Remove the debug banner
debugShowCheckedModeBanner: false,
title: 'Kindacode.com',
home: HomePage(),
);
}
}
以下是我正在使用的版本:
environment:
sdk: ">=2.12.0 <3.0.0"
dependencies:
flutter:
sdk: flutter
# The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^1.0.2
firebase_core: ^1.3.0
cloud_firestore: ^2.2.2