dart

问题 What is the method .reload() from the FirebaseUser used for? Locally the function doesn't change any data, and with Firestore.instance.currentUser() i would always get the current data, wouldn't I? From the docs: public Task reload () Manually refreshes the data of the current user (for example, attached providers, display name, and so on). So I originally thought after calling user.reload() the output would be: "name of user: bar" and not "name of user: foo". So for me it seems like it doesn

问题 I have have been able to pick a file from my computer and display in my flutter web app. I have a function(of type File ) which takes a file and uploads it to the server. like so functionName(File imageToSend) . But when I try to send this image to the sever side, it gives me an error. Am doing the upload using the code below: Uint8List uploadedImage; File theChosenImg; FileReader reader = FileReader(); FileReader reader2 = FileReader(); filePicker() async { InputElement uploadInput =

问题 I'm exploring Futures in Dart, and I'm confused about these two methods that Future offers, .then() and .whenCompleted() . What's the main difference between them? Lets say I want to read a .txt using .readAsString() , I would do it like this: void main(){ File file = new File('text.txt'); Future content = file.readAsString(); content.then((data) { print(content); }); } So .then() is like a callback that fires a function once the Future is completed. But I see there is also .whenComplete()

问题 I'm exploring Futures in Dart, and I'm confused about these two methods that Future offers, .then() and .whenCompleted() . What's the main difference between them? Lets say I want to read a .txt using .readAsString() , I would do it like this: void main(){ File file = new File('text.txt'); Future content = file.readAsString(); content.then((data) { print(content); }); } So .then() is like a callback that fires a function once the Future is completed. But I see there is also .whenComplete()

问题 how I can put any image inside a shape like this image I used CustomPaint and draw this shape but I can't use the image inside this and also I can't control the size for this shape 回答1: There are lots of custom shape creator packages, like: flutter_custom_clippers polygon_clipper clippy_flutter 来源： https://stackoverflow.com/questions/65486619/how-i-can-use-custom-shape-use-flutter

问题 how I can put any image inside a shape like this image I used CustomPaint and draw this shape but I can't use the image inside this and also I can't control the size for this shape 回答1: There are lots of custom shape creator packages, like: flutter_custom_clippers polygon_clipper clippy_flutter 来源： https://stackoverflow.com/questions/65486619/how-i-can-use-custom-shape-use-flutter

问题 The following NoSuchMethodError was thrown while handling a gesture: The method 'save' was called on null. Receiver: null Tried calling: save() I'm creating a page to update user registration data, and when I click on update this error appears and nothing happens. I'm learning flutter now, and there's a lot that I don't know, can someone help me? import 'package:flutter/material.dart'; import '../../generated/l10n.dart'; import '../models/user.dart'; import '../helpers/helper.dart'; import '.

问题 I'm changing the color of a custom menu icon, by using the setState in my Custom Icon Widget Although I'd like to change the previous pressed Icon to the previous state (before the color was Indigo ) Edit 2: Live demo: https://alexakis97.github.io/webappjs/ By changing the _color variable in onTap method I manage to change the color. To get a better understanding this an Custom Icon Widget: class _CustomBottomIconState extends State<CustomBottomIcon> { final Function changeMenu; final int

问题 How can I stop breaking word into newline at hyphen character. Here is the relevant code Container( color: Colors.red.withOpacity(.4), width: 315, padding: const EdgeInsets.symmetric( horizontal: 12.0, vertical: 6.0, ), child: Text( 'Ultra Low-Fat', style: Theme.of(context).textTheme.display1, ), ) Currently the screen looks like this But I want the text to show like this Ultra Low-Fat 回答1: I managed to solve this by replacing all hyphens with non-breaking hyphen character \u2011 const

问题 How can I stop breaking word into newline at hyphen character. Here is the relevant code Container( color: Colors.red.withOpacity(.4), width: 315, padding: const EdgeInsets.symmetric( horizontal: 12.0, vertical: 6.0, ), child: Text( 'Ultra Low-Fat', style: Theme.of(context).textTheme.display1, ), ) Currently the screen looks like this But I want the text to show like this Ultra Low-Fat 回答1: I managed to solve this by replacing all hyphens with non-breaking hyphen character \u2011 const