AnimatedBuilder 对于要把animation作为build函数的一部分的较为复杂的widget很有用。 想要使用 AnimatedBuilder，只需构造widget并将其传递给builder函数。

背景：新App预计需要接入flutter，作为一个被社会毒打了数年的社畜，对此有点慌，明确表示：东西还没有接入，就要考虑“后面是否要废弃”，“废弃的成本有多高”等等一系列放弃问题一、包体积成本（release版本）：1、android：大约6M（只要armeabi-v7a , 没去掉material 资源）2、ios: 大约十几M二、混编兜底：主要看flutter抗不住的情况下，其他技术兜底的能力

在animation中使用Opacity widget直接导致widget（可能还有它的子树）每一帧都rebuild，这效率很低。 建议改用 AnimatedOpacity 或 FadeTransition。

Understanding constraints掌握constraints原文地址【英文】【翻墙】：https://flutter.dev/docs/development/ui/layout/constraintsthis GitHub repoWhen someone learning Flutter asks you why some widget with width:100 isn’t

文章目录Connect to a physical device 连接真机Run in profile modeLaunch DevToolsThe performance overlayInterpreting the graphsFlutter’s threadsPlatform threadUI threadRaster thread (previously known as the GPU

文章目录WidgetsComposition --组合(替代继承)Building widgetsWidget stateState managementWidgetsAs mentioned, Flutter emphasizes widgets as a unit of composition. Widgets are the building blocks of a Flutter app’

flutter已有的丰富学习资料（2020）记录比较丰富的学习资料提示：写完文章后，目录可以自动生成，如何生成可参考右边的帮助文档文章目录flutter已有的丰富学习资料（2020）一、基础技术入门资料三、资料1.2020年谷歌大会(flutter)2.阿里开源flutter资料四、性能1、内存最后一、基础技术入门资料flutter 的中国社区：https://flutterchina.club/

Flutter architectural overview

译者额外添加flutter的渲染流程图，有助于理解本文：图一、图二、Sublinear layout--亚线性(sublinear)布局(layout)With a large number of widgets and render objects, the key to good performance is efficient algorithms. Of paramount importa

Flutter: Don’t Fear the Garbage CollectorFlutter uses Dart as a development language and as a runtime. Dart’s runtime is ever-present, both in debug and release modes, but there are big differences be