Flutter

Flutter The Function Color isn't defined or Undefined class Color

由 こ雲淡風輕ζ 提交于 2021-02-17 03:34:39
问题 Okay I don't even know what to write. Everything was working fine few hours ago. Then I saw Flutter upgrade is available. So I tried to upgrade. That's when everything started to fall apart. Anyway, I used vpn to run terminal commands. I was successful. After that every single flutter project I am opening is showing this error. I tried with other projects. I can run and build apk but this errors are there. Here is output of run command: Launching lib\main.dart on POCOPHONE F1 in debug mode...

How to get all events in a month using table_calendar in flutter?

由 北城余情 提交于 2021-02-16 21:05:21
问题 I have built a calendar with user's appointments using table_calendar in flutter. In my current code, I can only return all appointments of the user. Now, I am trying to fetch all appointments within a same month only and display them below the calendar. That is to say, when I swap the month on the calendar, I should only see a list of appointments within the month I am currently looking at. Currently, I am fetching all appointment records of the user from backend. To achieve my goal, which

How to get all events in a month using table_calendar in flutter?

由 主宰稳场 提交于 2021-02-16 21:02:31
问题 I have built a calendar with user's appointments using table_calendar in flutter. In my current code, I can only return all appointments of the user. Now, I am trying to fetch all appointments within a same month only and display them below the calendar. That is to say, when I swap the month on the calendar, I should only see a list of appointments within the month I am currently looking at. Currently, I am fetching all appointment records of the user from backend. To achieve my goal, which

currentUser() is not working type why I am seeing the expression doesn't evaluate to a function, so it can't be invoked

由 岁酱吖の 提交于 2021-02-16 20:25:38
问题 I'm new in Flutter, I'm working on a simple authentication app when I registered i should navigate to the chat screen and i want to grab current user but when i call FireBaseAuth.instance.currentUser() I got an exception "the expression doesn't evaluate to a function, so it can't be invoked." Why I'm seeing this? Please Help import 'package:firebase_auth/firebase_auth.dart'; import 'package:flutter/material.dart'; import 'package:flash_chat/constants.dart'; class ChatScreen extends

Flutter :- Inside the PageView Image is not setting to fit the screen on width?

由 痴心易碎 提交于 2021-02-16 20:16:08
问题 I am using the PageView for the view-pager functionality and showing the image on each page with contains some text and button on each page. As I am using the Stack widget for putting the view on one another like Relative-layout in Android , But My Image on the First Page of the PageView is not set to fit on the screen I have tried the below solution like below 1).First link 2). Second Link But not getting the proper solution, I have tried the below lines of code for it, class

Flutter async form validation

由 时间秒杀一切 提交于 2021-02-16 20:04:58
问题 I am having the same problem as the poster in this question: flutter validate form asynchronously. However, I'm having trouble implementing this and understand how the validation is working. First, what does this code return? Does this return a boolean? Future checkUser() async { var user = await Firestore.instance .collection('users') .document(userNameController.text) .get(); return user.exists; Second, what is the userNameValidator in this case? Is this a boolean? new TextFormField(

Flutter Web

由 偶尔善良 提交于 2021-02-16 19:58:24
Flutter作为一个可移植的UI框架，已经支持现代Web应用开发了！我们很开心已经发布了SDK预览版，这样你可以在Web浏览器里直接运行你的Flutter UI代码。 Flutter Web的目标 从去年Beta版发布以来，客户们已经使用Flutter来创建可以运行在iOS和Android上的移动应用了。但是，Flutter是以可移植的UI工具集构架的，它还可以运行在其他环境下，例如Windows、Mac、Fuchsia甚至Raspberry Pi。由于Flutter是使用Dart构建的，它针对原生机器码和JavaScript都包含了生产级的编译器，因此我们有了一个坚实的基础。接下来的挑战在于需要使用web平台的对等单元来替换基于Skia的图形引擎和文本渲染器。 要正确地实现这一点，我们需要提供： 60帧/秒快速平滑动画的性能 与其他平台一致的行为和视觉感受 可以与当前开发模式集成的高效的开发者工具 在所有现代浏览器上对核心web特性的支持 虽然用于Web的Flutter还在开发中，在上述几个方面都还有很多工作要进行，不过我们已经可以和大家分享一个预览版了，你可以尝试以下，期待你的反馈！ Flutter Web总体架构 Flutter Web的总体架构与用于移动平台的Flutter非常接近： Flutter框架（上图中绿色部分）在移动和web平台中共享

Why would I want to delete build/ directory?

由 橙三吉。 提交于 2021-02-16 19:01:28
问题 (New to Flutter/Dart/Android) In console just did: C:\Users\lordnull>flutter help clean Delete the build/ directory. Just wondering why we would want to delete a project's build directory (using "flutter clean")? Does it help cure some transient Flutter problem? If so what? 回答1: The content of the build directory is updated incrementally depending on configuration or source changes for performance reasons because a full rebuild every time would take way too much time. The dependencies can be

Why would I want to delete build/ directory?

由 ﹥＞﹥吖頭↗ 提交于 2021-02-16 19:01:03
问题 (New to Flutter/Dart/Android) In console just did: C:\Users\lordnull>flutter help clean Delete the build/ directory. Just wondering why we would want to delete a project's build directory (using "flutter clean")? Does it help cure some transient Flutter problem? If so what? 回答1: The content of the build directory is updated incrementally depending on configuration or source changes for performance reasons because a full rebuild every time would take way too much time. The dependencies can be

Dart Convert IEEE-11073 32-bit FLOAT to a simple double

由 纵然是瞬间 提交于 2021-02-16 15:34:07
问题 I don't have much experience working with these low level bytes and numbers, so I've come here for help. I'm connecting to a bluetooth thermometer in my Flutter app, and I get an array of numbers formatted like this according to their documentation. I'm attempting to convert these numbers to a plain temperature double, but can't figure out how. This is the "example" the company gives me. However when I get a reading of 98.5 on the thermometer I get a response as an array of [113, 14, 0, 254]
订阅 Flutter