Flutter

Flutter on Yocto?

由 天大地大妈咪最大 提交于 2021-02-19 23:57:45
问题 Is it possible to develop a flutter application on Yocto with Docker or without it? I'm asking that because planning to use an IMX series processor and want to develop a flutter application. If yes, how can I? Please give a document. 来源： https://stackoverflow.com/questions/56502028/flutter-on-yocto

闲鱼服务端架构演进历程

由 孤街醉人 提交于 2021-02-19 10:48:47
作者 | 万佳 嘉宾 | 巴滕 闲鱼是从阿里巴巴某一茶水间“游”出来的。2014 年 6 月，闲鱼诞生，2 年时间不到，其用户数突破 1 亿。如今，它已经成为国内最知名的闲置交易平台，拥有数亿用户，年交易额超过 2000 亿，并开启了一个万亿市场。闲鱼能有今天的成绩，离不开背后的技术迭代、架构升级和技术人的付出。闲鱼初创时，架构设计面临着哪些挑战？闲鱼服务端架构在 6 年时间里是怎样演进的？闲鱼在服务端架构上还在做哪些新尝试？...... 带着这些问题，InfoQ 记者采访了闲鱼技术部高级技术专家巴滕。自闲鱼创立以来，他一直参与闲鱼服务端架构持续演进的工作。 1、闲鱼的业务特点 据巴滕介绍，闲鱼是一个典型的双边市场，买家和卖家规模相互影响，“如何同时服务好买家和卖家双方，这是我们一直努力的方向”。 对买家来说，要提升商品发现效率，帮助他们尽快地买到商品。 对卖家而言，要降低发布门槛，帮助他们尽快地把商品卖出去。 对于平台，要持续优化用户的使用体验，比如降低纠纷和欺诈问题，同时持续扩大市场规模。 2、闲鱼服务端最初的架构设计 众所周知，闲鱼的前身是 PC 时代的淘宝二手，它属于淘宝的一个小频道。当时，闲鱼整体业务规模和用户量都非常小。基本上，单一应用就支撑所有业务，并且整体架构和服务完全是面向 PC 设计的。 “当时，服务端同学需要时常编写 Velocity 模板代码

dart:io sync vs async file operations

由 痞子三分冷 提交于 2021-02-19 09:04:46
问题 There are a number of sync and async operations for files in dart:io: file.deleteSync() and file.delete() file.readAsStringSync() and file.readAsString() file.writeAsBytesSync(bytes) and file.writeAsBytes(bytes) and many, many more. What are the considerations that I should keep in mind when choosing between the sync and async options? I seem to recall seeing somewhere that the sync option is faster if you have to wait for it to finish anyway ( await file.delete() for example). But I can't

Xcode Build failed,fatal error: module 'firebase_auth' not found @import firebase_auth;

由 ≡放荡痞女 提交于 2021-02-19 07:47:32
问题 Doctor summary (to see all details, run flutter doctor -v): [✓] Flutter (Channel stable, v1.17.4, on Mac OS X 10.15.5 19F101, locale en-US) [✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3) [✓] Xcode - develop for iOS and macOS (Xcode 11.5) [✓] Android Studio (version 4.0) [✓] VS Code (version 1.46.1) [!] Connected device ! No devices available ! Doctor found issues in 1 category. \\\Error Message ** BUILD FAILED ** Xcode's output: ↳ /Users/Razi/Desktop/projects

Flutter Web : How to run javascript using dart js

由 淺唱寂寞╮ 提交于 2021-02-19 06:29:05
问题 I want to use the Stripe library on the web flutter. But unfortunately, until now there is still no stripe library available for web flutter. Therefore I try to run javascript on the web flutter, where it will call the stripe-js library (https://stripe.com/docs/js/payment_intents/confirm_card_payment). What I want to ask, first, is how to use the javascript library on web flutter? like this : <script src = "https://js.stripe.com/v3/"> </script> Secondly, how do I call the javascript function

Scrollable position of a TextSpan within a RichText

由 你离开我真会死。 提交于 2021-02-19 06:05:00
问题 I have many TextSpan s in my RichText . I would like to scroll in a specific TextSpan , but for knowing the position I need the context. TextSpan is not a widget. So how can I get the TextSpan 's position? I can't use WidgetSpan because my Span s are pieces of the same sentence. Thanks 来源： https://stackoverflow.com/questions/57907410/scrollable-position-of-a-textspan-within-a-richtext

Flutter - Is there a way to use just IconButton (without creating an app bar) to open the drawer?

由 心不动则不痛 提交于 2021-02-19 05:46:25
问题 I'm trying to use the IconButton that can open the drawer on my app page, so when I tap the icon button, I expect to see the drawer. I've been looking up a way to do so online, but seemed like there're only two solutions: I can either use the appbar to put the IconButton in, or I can try the floating action button. But they're not what I'm looking for, I want just the IconButton to open the drawer. Is it possible do it? 回答1: Yes, you can easily open the drawer through IconButton without using

how to use where with orderby in flutter

由 依然范特西╮ 提交于 2021-02-19 05:41:30
问题 how to use where with orderBy in flutter. any one can tell me how these indexes are working and how to properly create them. Query query = Firestore.instance .collection('clients') .where('sequenceStatus', isEqualTo: sequenceName) .orderBy('created', descending: true) .limit(20); W/Firestore(19854): (19.0.0) [Firestore]: Listen for Query(clients where sequenceStatus == quotes order by -created, - name ) failed: Status{code=FAILED_PRECONDITION, description=The query requires an index. You can

how to use where with orderby in flutter

由 白昼怎懂夜的黑 提交于 2021-02-19 05:41:06
问题 how to use where with orderBy in flutter. any one can tell me how these indexes are working and how to properly create them. Query query = Firestore.instance .collection('clients') .where('sequenceStatus', isEqualTo: sequenceName) .orderBy('created', descending: true) .limit(20); W/Firestore(19854): (19.0.0) [Firestore]: Listen for Query(clients where sequenceStatus == quotes order by -created, - name ) failed: Status{code=FAILED_PRECONDITION, description=The query requires an index. You can

I am not able to preview the icons on vscode while browsing?

由 泪湿孤枕 提交于 2021-02-19 05:23:16
问题 As seen in the picture I'm browsing the icons but none of them are shown. Is there a change in a new update or am I missing something here> it used to show the icons while I browsed. 回答1: There should be an arrow appearing when you hover on the right side of the tooltip stating "read more". Simply click once and therefore the icons preview should always appear. 回答2: I had the same issue. I maximized the VSCode editor, closed the navigation pane on left, and aligned the line most left then
订阅 Flutter