dart

问题 When I run: $ flutter build web I'm getting the error Missing index.html. The flutter app is displaying in the browser, but in VS Code it reads "No Device." How can I debug, or fix this problem? 回答1: It would help to see the output of your flutter doctor, but I am guessing that your project is not configured for web. If you haven't already, you need to switch to the flutter beta channel like so: $ flutter channel beta $ flutter upgrade $ flutter config --enable-web At this point, running

问题 When I run: $ flutter build web I'm getting the error Missing index.html. The flutter app is displaying in the browser, but in VS Code it reads "No Device." How can I debug, or fix this problem? 回答1: It would help to see the output of your flutter doctor, but I am guessing that your project is not configured for web. If you haven't already, you need to switch to the flutter beta channel like so: $ flutter channel beta $ flutter upgrade $ flutter config --enable-web At this point, running

问题 I want to create a Snackbar , that looks like an image below, Google has created. Something like this: I wanted to start creating one, but I don't have an idea about it, how should I start or how should I customize the Snackbar . I don't want to use flutter toast plugin. I want to create my own Snackbar . It would be great if somebody guides me on this 回答1: First of all, based on your screenshot, maybe this is already supported by SnackBarBehavior , just pass the snackbar constructor behavior

问题 i want to setup firebase inapp messaging on my flutter apps. first, it need FirebaseInstanceId as explained here, so i can test send message to my device. However the document does not tell more detail how to get it on Android, especially on flutter. any idea ? Note : someone has claimed that he can use inapp-messaging in flutter, please see here Thank you in Advance... 回答1: The Firebase Instance ID can be fetched using -instanceIDWithHandler on iOS or getInstanceId on Android. At the time of

问题 I'm receiving a DateTime response from API that's sets the timezone to UTC. But when I try to convert the received data using toLocal() it doesn't convert. my local time is HKT here's my code. //TIME DIFFERENCE getNotificationDate(DateTime date) { date = date.toUtc(); final convertedDate = date.toLocal(); final dateNow = DateTime.now(); print('TIMENOW: ' + dateNow.toString()); print('TIMENOTIFC: ' + convertedDate.toString()); final difference = dateNow.difference(convertedDate); print(

问题 I am passing variables from one activity to another in flutter but getting the error "Instance member ‘latitude’ can’t be accessed using static access" I need it converted in that block so I can assign it to a static URL. class Xsecond extends StatefulWidget { final double latitude; final double longitude; Xsecond(this.latitude, this.longitude, {Key key}): super(key: key); @override _Xsecond createState() => _Xsecond(); } class _Xsecond extends State<Xsecond> { static String lat = Xsecond

问题 I am passing variables from one activity to another in flutter but getting the error "Instance member ‘latitude’ can’t be accessed using static access" I need it converted in that block so I can assign it to a static URL. class Xsecond extends StatefulWidget { final double latitude; final double longitude; Xsecond(this.latitude, this.longitude, {Key key}): super(key: key); @override _Xsecond createState() => _Xsecond(); } class _Xsecond extends State<Xsecond> { static String lat = Xsecond

问题 After switched to branch 'stable' flutter channel The following is the build issue. Error: The specified language version is too high. The highest supported language version is 2.8. output: ../../third_party/dart/third_party/pkg/collection/lib/src/utils.dart:1:1: Error: The specified language version is too high. The highest supported language version is 2.8. // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file ^ ../../third_party/dart/third_party/pkg/collection/lib

问题 After switched to branch 'stable' flutter channel The following is the build issue. Error: The specified language version is too high. The highest supported language version is 2.8. output: ../../third_party/dart/third_party/pkg/collection/lib/src/utils.dart:1:1: Error: The specified language version is too high. The highest supported language version is 2.8. // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file ^ ../../third_party/dart/third_party/pkg/collection/lib

问题 After switched to branch 'stable' flutter channel The following is the build issue. Error: The specified language version is too high. The highest supported language version is 2.8. output: ../../third_party/dart/third_party/pkg/collection/lib/src/utils.dart:1:1: Error: The specified language version is too high. The highest supported language version is 2.8. // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file ^ ../../third_party/dart/third_party/pkg/collection/lib