dart

Setting Flutter log Levels / Flutter printing thousands of verbose lines

非 Y 不嫁゛ 提交于 2020-12-12 04:04:41
问题 Flutter log prints thousands of verbose/spam logs. I am trying to debug a complex app but flutter printing so much verbose that it is difficult for me to find things which i am printing myself. Is there any way to disable Verbose? Something like: Logger.level.disable('verbose') My platform: Doctor summary (to see all details, run flutter doctor -v): [√] Flutter (Channel stable, v1.12.13+hotfix.8, on Microsoft Windows [Version 10.0.18362.657], locale en-US) [√] Android toolchain - develop for

Rename a file/Image in flutter

跟風遠走 提交于 2020-12-11 10:01:15
问题 I am picking a image from gallery/taking a photo using image_picker: ^0.6.2+3 package. File picture = await ImagePicker.pickImage( maxWidth: 800, imageQuality: 10, source: source, // source can be either ImageSource.camera or ImageSource.gallery maxHeight: 800, ); and I get picture.path as /Users/[ some path ]/tmp/image_picker_A0EBD0C1-EF3B-417F-9F8A-5DFBA889118C-18492-00001AD95CF914D3.jpg Now I want to rename the image to case01wd03id01.jpg Note : I don't want to move it to new folder How

Dart http: “Bad state: Can't finalize a finalized Request” when retrying a http.Request after fetching a new access token

爷,独闯天下 提交于 2020-12-11 04:53:53
问题 I'm currently trying to access a Web API in Flutter that requires a JWT access token for authorization. The access token expires after a certain amount of time. A new access token can be requested with a separate refresh token. Right now this access token refresh is performed as soon as a request returns a 401 response. After that, the failed request should be retried with the new access token . I'm having trouble with this last step. It seems like a http.BaseRequest can only be sent once.

Dart http: “Bad state: Can't finalize a finalized Request” when retrying a http.Request after fetching a new access token

南楼画角 提交于 2020-12-11 04:53:34
问题 I'm currently trying to access a Web API in Flutter that requires a JWT access token for authorization. The access token expires after a certain amount of time. A new access token can be requested with a separate refresh token. Right now this access token refresh is performed as soon as a request returns a 401 response. After that, the failed request should be retried with the new access token . I'm having trouble with this last step. It seems like a http.BaseRequest can only be sent once.

从零开始学Android!Android学习笔记在互联网上火了,吐血整理

依然范特西╮ 提交于 2020-12-11 02:03:48
程序员与别的专业有所不同,其他专业都是越老越香,而程序员却是一个例外,因为计算机技术更新太快,而且工作强度很大,因此大部分程序员只会写 3 年代码。3 年后要不晋升做项目经理,要么转行,个别研究所除外。 360°全方面性能调优 一、设计思想与代码质量优化 二、程序性能优化 三、开发效率优化 Android框架体系架构 一、高级UI晋升 二、Android组件内核 三、大型项目必备IPC 四、数据持久化 五、Framework内核解析 架构师筑基必备技能 一、深入Java泛型 二、注解深入浅出 三、并发编程 四、数据传输与序列化 五、Java虚拟机原理 六、反射与类加载 七、高效IO NDK模块开发 一、C++与C#数据类型总结 二、C与C++之内存结构与管理 三、C与C++之预处理命令与用typedef命名已有类型 四、C与C++之结构体、共用体 五、C与C++之指针 六、C/C++ 之多线程机制 七、C/C++ 之函数与初始化列表 JNI模块 一、静态注册与动态注册 二、方法签名与Java通信 三、局部引用、全局引用和弱全局引用 设计思想解读开源框架 一、热修复设计 二、插件化框架设计 三、组件化框架设计 四、图片加载框架 五、网络访问框架设计 六、RXJava响应式编程框架设计 七、IOC架构设计 八、Android架构组件Jetpack Flutter进阶学习笔记 一

Condition does not work when using a streamBuilder in Flutter

别来无恙 提交于 2020-12-10 07:54:33
问题 I'm trying to implement a screen that displays data from Firebase but I want the streambuilder to check if the database is empty, if it's empty I want it to show a text saying "no data" but if it's not, I want it to show the data from firebase. This is the code I have but it does not work as expected, it just shows me a blank screen when there is no data(it works fine when I have data in the database, I just don't want the user to see a blank screen when there is no data). Can you advise what

Condition does not work when using a streamBuilder in Flutter

穿精又带淫゛_ 提交于 2020-12-10 07:54:28
问题 I'm trying to implement a screen that displays data from Firebase but I want the streambuilder to check if the database is empty, if it's empty I want it to show a text saying "no data" but if it's not, I want it to show the data from firebase. This is the code I have but it does not work as expected, it just shows me a blank screen when there is no data(it works fine when I have data in the database, I just don't want the user to see a blank screen when there is no data). Can you advise what

how to read data from firestore flutter

无人久伴 提交于 2020-12-10 06:59:38
问题 i want to read data from firestore in a listtile i dont want to use streambuilder i want to access the documents field individually i try this but not working class ProductList extends StatelessWidget { Stream<DocumentSnapshot> snapshot = Firestore.instance.collection("listofprods").document('ac1').snapshots(); @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( appBar: AppBar(), body: Padding( padding: const EdgeInsets.all(8.0), child: Column( mainAxisAlignment

TIOBE 12 月编程语言:Python 有望第四次成为年度语言!

送分小仙女□ 提交于 2020-12-10 05:46:41
须臾间,2020 年已经不足一个月。近日,编程语言社区 TIOBE 最新发布了 12 月编程语言排行榜。下个月月初,TIOBE 社区也即将揭晓 2020 年年度编程语言,谁又能摘得桂冠? 毋庸置疑,能够获得年度编程语言称号的编程语言必然是 2020 年中最受关注以及流行度、涨幅最高的编程语言。对此,TIOBE 官方进行了相应的统计,在过去一年中,涨幅最大的为 Python,增幅 1.9%;其次为 C++ 0.71 %;R 语言增幅 0.6%、Groovy 增幅 0.69%。 综合来看,其他任何语言超过 Python 的机率都比较低。这意味着 Python 很有可能将于今年也是有史以来第四次获得年度编程语言称号的编程语言。 除了以上,值得关注的是,近几个月期间,TIOBE 榜单已然成为了 Python 与 Java 的追逐战战场。本月中,Java 虽然整体热度与趋势有所下滑,但还是再次超越了 Python 重回第二宝座。 其他编程语言排名 另外,本月编程语言榜单还有一些变化: Rust 从第 25 位上升到了 21 位; Julia 从 30 名上升到了第 26 名; Dart 从第 27 位下降到第 31 名; Kotlin 从第 36 位下降到第 40 位; TypeScript 从第 43 名上升一位,至第 42 名。 下面列出了完整的21-50名,因为是非官方发布的

Flutter技术在会展云中大显身手

帅比萌擦擦* 提交于 2020-12-10 05:46:23
导读: 在《会展云技术解读》专题中,我们先发推出了 5 篇文章,分别从安全、设计、智能推荐系统、移动监控、视频直播等维度深入解读会展云背后的技术能力: 安全篇——多重安全保障护航云上会展 设计篇——基于服务设计的线上展览 智能推荐篇——深度解读智能推荐系统搭建之路 移动监控篇——面对突发事故,APP如何做好崩溃分析与性能监控? 后疫情时代的会展云,如何打造一场完美视频直播? 本篇文章我们将继续介绍会展云中的Flutter技术应用。 会展云解决方案覆盖了业务,技术,平台,应用四个层面,业务层面提供科技感十足的云上展厅、多种模式的论坛会议等;应用层面有多种解决方案,直播解决方案、视频会议解决方案、移动研发解决方案等;技术层面依托海量弹性云计算能力和充足可扩展的云存储及带宽资源,集成了多种京东中台平台的能力,有技术中台、数据中台、智能中台及业务中台能力,可快速响应前台应用的需求。 作为云上展会,最终呈现给广大参会者的对外窗口必然是网站、APP、H5、小程序等线上系统,移动开发必然是重中之重。 众所周知,Flutter是谷歌公司提供的跨平台UI工具包,支持跨Android、iOS等多个平台复用代码,同时允许应用程序直接与基础平台的服务交互。其设计目的是使开发人员能够在不同平台上尽量复用代码,交付高性能的应用。 作为可扩展的分层系统,Flutter有一系列独立的库,每一个库都依赖于更底层的库