dart

Plugin project :location_web not found. Please update settings.gradle. How do I fix this?

由 眉间皱痕 提交于 2021-01-20 15:53:37
问题 I was using the google maps api and location pub,dev package in my android flutter app, and tried to bring up an image using the url from the api. This was the url with some code: class LocationHelper{ static String mapviewpointer({double latitude, double longitude}){ return "https://maps.googleapis.com/maps/api/staticmap?center=$latitude,$longitude&zoom=13&size=600x300&maptype=roadmap&markers=color:pink%7Clabel:C%7C$latitude,$longitude&key=$GOOGLE_API_KEY"; } } it threw the following error

Plugin project :location_web not found. Please update settings.gradle. How do I fix this?

由 …衆ロ難τιáo~ 提交于 2021-01-20 15:53:14
问题 I was using the google maps api and location pub,dev package in my android flutter app, and tried to bring up an image using the url from the api. This was the url with some code: class LocationHelper{ static String mapviewpointer({double latitude, double longitude}){ return "https://maps.googleapis.com/maps/api/staticmap?center=$latitude,$longitude&zoom=13&size=600x300&maptype=roadmap&markers=color:pink%7Clabel:C%7C$latitude,$longitude&key=$GOOGLE_API_KEY"; } } it threw the following error

Plugin project :location_web not found. Please update settings.gradle. How do I fix this?

由 半世苍凉 提交于 2021-01-20 15:53:05
问题 I was using the google maps api and location pub,dev package in my android flutter app, and tried to bring up an image using the url from the api. This was the url with some code: class LocationHelper{ static String mapviewpointer({double latitude, double longitude}){ return "https://maps.googleapis.com/maps/api/staticmap?center=$latitude,$longitude&zoom=13&size=600x300&maptype=roadmap&markers=color:pink%7Clabel:C%7C$latitude,$longitude&key=$GOOGLE_API_KEY"; } } it threw the following error

开发跨平台app推荐React Native还是flutter？

由 ﹥＞﹥吖頭↗ 提交于 2021-01-20 11:26:58
嗯。。。这个问题十分不好回答啊(捋下鱼须)。闲鱼作为flutter领域的先驱者，以及 fish_redux 、 flutter_boost 等当红flutter库的作者，当然是欢迎广大的开发者多多使用flutter相关技术栈 逃~:)。咳咳，不过呢，我们还是正经得聊一下React Native(下面简称RN)和flutter之前的异同： 0x00 简单介绍一下 React Native React Native是Facebook开源的一款基于react思想、使用JS、能够给移动平台带来native般体验的框架， 官网 最新的版本是0.5.9。 flutter flutter来自Google，上层使用dart语言构建跨平台应用，通过平台相关的embedded层接入到使用c++编写的engine层，再通过skia库直接与GPU进行交互。通过对dart代码的AOT编译，拥有优异的计算(CPU)、渲染(GPU)性能。 官网 最新的版本为1.2。 0x01 跨平台性 开发者们使用跨平台技术栈，首要的目的是为了能够省事儿，所以跨平台能力是首先要被衡量的指标。 Build native mobile apps using JavaScript and React 这意味着开发者可以复用庞大的JavaScript生态和优雅的react思想来书写RN的代码，给开发提供很多的便利性。 从实现原理上来说

开发跨平台 App 推荐 React Native 还是 Flutter？

由 你说的曾经没有我的故事 提交于 2021-01-20 09:51:24
官网： RN: https://reactnative.cn/ Fluter: https://flutterchina.club/ React Native 能够跨平台是因为它允许你使用 React/JavaScript/JSX 的写法写原生应用，而在底层他会替你调用相应的 iOS 原生组件或者 Android 原生组件，又或者直接生成适用于 Web 的 DOM 树。所以他做的事情是，用 JavaScript 调用对应系统渲染器进行渲染展示。 Flutter 又是怎么跨平台的呢——Skia。当你使用 Flutter 框架（Dart）开发应用时，其底层渲染由 Skia 接管，没有什么 Android runtime、Chromium 或者其他中间层了，是的，Skia 的下层便是 CPU/GPU 了，一个受控的画布，基本上意味着你想画什么就画什么了，不再需要调用原生 Widgets，而这便是 Flutter 能够跨平台的原因。 谁更快？ flutter React Native 这种从使用 JavaScript 到解析调用 Native 的过程中间显然要经过多个环节，而 Flutter 里将 Dart 代码 AOT 编译为本地代码，所以 Flutter 应用是直接使用本机指令集运行，这就不涉及解释器这一层。关于 Flutter 为什么这么快 Google 的工程师在 Google I

What's the usage of three dots (…) in dart List?

由 廉价感情. 提交于 2021-01-18 12:11:20
问题 I have my code written like this but it gives an error saying: Error: A value of type 'List' can't be assigned to a variable of type 'Widget'. Column( children: [ Question( questions[_questionIndex]['questionText'], ), ...(questions[_questionIndex]['answers'] as List<String>) .map((answer) { return Answer(_answerQuestion, answer); }).toList() ], ) 回答1: Dart 2.3 introduce Spread operator (…) Reference link : https://medium.com/flutter-community/whats-new-in-dart-2-3-1a7050e2408d var a = [0,1,2

What's the usage of three dots (…) in dart List?

由 ε祈祈猫儿з 提交于 2021-01-18 12:11:18
问题 I have my code written like this but it gives an error saying: Error: A value of type 'List' can't be assigned to a variable of type 'Widget'. Column( children: [ Question( questions[_questionIndex]['questionText'], ), ...(questions[_questionIndex]['answers'] as List<String>) .map((answer) { return Answer(_answerQuestion, answer); }).toList() ], ) 回答1: Dart 2.3 introduce Spread operator (…) Reference link : https://medium.com/flutter-community/whats-new-in-dart-2-3-1a7050e2408d var a = [0,1,2

How to make HTTP request to In Flutter Web

由 不想你离开。 提交于 2021-01-18 08:01:47
问题 I was trying my hands on flutter web. I tried to connect a simple flutter web app I created to mysql database and localhost using the http package. However I dont get any data returned from the request method. When I tried to print out snaphot.error I got this: XMLHttpRequest error . I have this method in a FutureBuilder() getMethod()async{ String theUrl = 'https://localhost/fetchData.php'; var res = await http.get(Uri.encodeFull(theUrl),headers: {"Accept":"application/json"}); var

How to make HTTP request to In Flutter Web

由 怎甘沉沦 提交于 2021-01-18 08:00:28
问题 I was trying my hands on flutter web. I tried to connect a simple flutter web app I created to mysql database and localhost using the http package. However I dont get any data returned from the request method. When I tried to print out snaphot.error I got this: XMLHttpRequest error . I have this method in a FutureBuilder() getMethod()async{ String theUrl = 'https://localhost/fetchData.php'; var res = await http.get(Uri.encodeFull(theUrl),headers: {"Accept":"application/json"}); var

How to remove diacritics (accents) from a string?

由 喜欢而已 提交于 2021-01-18 06:22:08
问题 I'm trying to convert some strings that are in Czech, Spanish, French etc. I'd like to take out the accent marks in the letters while keeping the letter. (E.g. convert é to e, č to c, Ž to Z, ñ to n) What is the best way to achieve this? Btw, there is a good similar question/answer for JavaScript 回答1: Not throughougly tested but seems to work void main() { var paragraph = "L'avantage d'utiliser le lorem ipsum est bien évidemment de pouvoir créer des maquettes ou de remplir un site internet de
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