字幕组成品列表（Beta）
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  • Android 平台
    • Game On! 游戏开发系列 - 031
      • Pie Noon - 1503060393
      • The Death of Base Game Activity - 1504030543
      • Surviving OpenGL Context Loss - 1504030546
      • WebP for Game Devs - 1504030547
      • Saved Games In-Depth (Part 1) - 1504070556
      • Saved Games In-Depth (Part 2) - 1504030548
      • Smaller Flipbook Textures with CRABBY - 1504030544
      • Google Tag Manager - 1504030545
      • Flatbuffers - 1505050794
      • Achievement Point Pointers - 1505050796
      • Frequency Scaling - 1505050797
      • Meet the Management APIs - 1501140367
      • Y U Ship Broken Games - 1505050795
    • Android 性能优化 - 088
      • Garbage Collection in Android - 1503170425
      • Performance Cost of Memory Leaks - 1503170424
      • Rendering Performance 101 - 1501130351
      • Understanding Overdraw - 1501130352
      • Understanding VSYNC - 1501130353
      • Tool - Profile GPU Rendering - 1501130354
      • Why 60fps? - 1501130355
      • Android UI and the GPU - 1501130356
      • Invalidations, Layouts, and Performance - 1501130357
      • Overdraw, Cliprect, QuickReject - 1501130358
      • Tool - Memory Monitor - 1501130363
      • Battery Performance 101 - 1501130364
      • Understanding Battery Drain on Android - 1501130365
      • Battery Drain and WakeLocks - 1501130366
      • Memory Performance 101 - 1504170661
    • I/O 2014 Android 开发专题 - 089
      • Activity Transitions - 1504020505
      • Building Apps For Android TV - 1504020520
      • Building great Android media experiences - 1504020510
      • Building a quality app from start to finish - 1504020515
      • App Indexing API - 1504020507
      • What's new in WebView - 1504010484
      • Bluetooth Low Energy - 1504010486
      • Building impressive Android media experiences - 1504010493
      • The next Generation of Authentication - 1504020497
      • Don't Alpha That Pixel! - 1504020523
      • NFC + HCE Your phone in an interactive world - 1504020509
      • Demystifying encodes and decodes of WebM - 1504020521
      • Google Cloud Messaging - 1504020524
      • Getting your Game on the Big Screen - 1504020518
      • I hear you like realtime memes - 1504020511
      • Offerize your App - 1504020506
      • Using the Android Job Scheduler - 1504020504
      • From Holo to Material - 1504020526
      • Under the Hood of Android Auto - 1504020501
      • Isolation for Android App Developers - 1504020498
      • Android Work - 1504010496
      • ExoPlayer: Adaptive video streaming on Android - 1504010489
      • Sample rates and resampling: Why can't we all just agree? - 1504010488
      • Drive Android API - 1504010485
    • Android Studio - 004
      • Layout Editor (Ep 3, Android Studio) - 1503290479
      • Introducing Gradle (Ep 2, Android Studio) - 1503170426
    • I/O 2014 Android 分发主题 - 091
      • Introduction to Google Play - 1504030534
      • Google Play: building your user community - 1504030535
      • Optimizing Apps for Education - 1504030536
      • Succeeding in Education Technology - 1504030530
      • Subscriptions Made Easy with Google Play - 1504030531
      • The world is your playground - go global with Google - 1504030533
      • Maximizing discoverability on Google Play - 1504030538
    • Android Auto - 003
      • Introduction to Android Auto - 1504130615
      • Android Auto Messaging - 1504130617
      • Android Auto Audio - 1504130616
    • Android Wear - 006
      • Designing for Android Wear - 1503210448
      • How We Customized Google Apps for Android Wear - 1503210450
      • Fullscreen apps for Android Wear - 1503210445
      • New Notification Features for Android Wear - 1503210446
      • Building Cloud-powered wearable Apps - 1503210449
      • An Introduction to Android Wear - 1503190435
      • Google I/O 2014 - Android Wear: The developer's perspective - 1503210442
      • Devoxx 2014 Interviews: Android Wear - 1503210440
      • DevBytes: Watch Faces for Android Wear - 1503210439
    • Android TV - 005
      • Using the Leanback library - 1504080588
      • Beach Buggy Racing Multiplayer with Nearby Connections (Play Services) - 1503060387
    • Android for Work - 106
      • Android for Work for Developers - 1503060390
      • App Configurations, Testing and Launchers - 1504110590
    • IO Bytes 2014 - Android - 066
      • Chrome Apps on Android and iOS - 1501080014
      • Perf Primer CPU, GPU and your Android game - 1501080017
  • Chrome 平台
    • IO Bytes 2014 - Chrome and Web - 067
      • Using the PageSpeed API - 1505070815
      • Fabulous Forms for the multi-device web - 1505070816
      • Testing multi-screen web pages - 1505070817
      • Responsive images today - 1505070819
      • Web Performance Testing at YouTube - 1505070828
      • Building sites for the multi-device web - 1505070820
      • Deep dive: Google Cloud Messaging for Chrome - 1505070827
  • Google 创业者资源
    • Coffee with a Googler - 012
      • Chat with Allen Huang of AndroidTV - 1503040384
      • Chat with Fred Chung about developer advocacy - 1503070395
      • Google Fit platform with Michelle Haq - 1503210443
      • Android Auto Product Manager Andrew Brenner - 1501120027
      • Chat with Francis Ma about Google Play services - 1501120028
    • Root Access For Startups - 077
      • What we learned building plug-ins for Android, with startup Magnet - 1503230453
      • How to use crowdfunding to your advantage, with startup Hale Devices - 1503280462
      • How to overcome customer objections when selling tech, with startup Guesswork - 1503280458
    • First Things First - 029
      • Getting started with Android: A crash-course in developing for Android - 1504120601
      • How to ask a question: conducting research for your startup - 1504120603
      • MVP Design Hacks: transform your hot idea into a validated prototype - 1504120602
      • Build something people want: Solving real problems - 1504120605
    • How I - 061
      • Use BigQuery to find my most valuable customers - 1504070573
      • Manage beta testing communities using Google Play - 1504070572
      • Use paper wireframing to build native prototypes - 1504070570
      • Used social media and $0 marketing to get 68 million users - 1504070568
      • Prep to fundraise with four questions - 1504070564
      • Validated my idea in 2 days (with no code) - 1504070562
      • Build open platforms on Android - 1504120596
      • Get cheap, automatic analytics for my business using BigQuery - 1504070571
      • Write press releases to get international media coverage - 1504070569
      • Test beta-product features using Google Apps - 1504070563
      • Use URL builder to measure ROI on social media - 1504070561
      • Use events to build DeadSocial's brand - 1504070557
      • Use BigQuery to visualize streaming data - 1503220452
      • Find, screen, and hire developers - 1503120406
      • Drive engagement with social challenges - 1504070558
  • 设计
    • DesignBytes - 017
      • Paper and Ink: The Materials that Matter - 1505050793
  • 云计算
    • DevBytes: Google Cloud Platform - 021
      • Powering the next killer app with the Google Cloud Platform - 1504210672
      • Introduction to Google Cloud Endpoints - 1504210675
      • The Beauty of Scale with Google Cloud Platform - 1504210678
    • Google Cloud Platform - Big Data - 105
      • GDELT & BigQuery: Understand the world - 1502200379
    • Uncategorized - 999
      • Introducing Google Cloud Platform Resources - 1501190370
  • Google 应用开发
    • Launchpad Online - 072
      • The Setup: Creating new apps using Google APIs - 1503190428
      • Listing your files in Google Drive - 1503190429
      • Customizing Google Analytics for your startup - 1503290473
      • The Launchpad Online series - 1503190427
      • Getting started with Google Analytics - 1503290472
      • Accessing Google Maps from a spreadsheet?!? - 1502220381
      • Change the world in 10 lines of code - 1503080398
    • Google Play Services - 054
      • Google Play services 6.1 - 1503290481
      • Google Play Services 7.0 - 1503200437
      • Google Play Services 6.5 - 1501080015
    • 谷歌地图 iOS SDK - 053
      • Maps Live: New Features in the Google Maps Mobile APIs for Android and iOS - 1504300777
    • Google 移动搜索开发 - 055
      • Is your app in the Google index? - 1504120598
      • Get more engaged users with Google Search for Developers - 1503070397
    • DevBytes: Google Cast - 020
      • Google Cast SDK for Android - 1504180666
      • Media Router Framework - Part 1 - Media Router API - 1504180667
      • Overview for Google Cast Receivers - 1504180664
      • Google Cast SDK for iOS - 1504180663
    • Getting Started with the Google Maps SDK for iOS - 035
      • Getting started with the Google Maps SDK for iOS, Part 1 - 1504270757
    • IO Bytes 2014 - Wearables - 070
      • Voice Driven GDK Glassware - 1505280836
    • Route 85 - 078
      • Introducing Route 85 - 1501120022
      • Quick Tip: Don't Default that Switch! - 1501190371
      • OpenInChrome on iOS, Part 1 - 1501120023
      • OpenInChrome on iOS, Part 2 - 1501120024
      • OpenInChrome on iOS, Part 3 - 1501120025
      • OpenInChrome on iOS, Part 4 - 1501120026
    • DevBytes 2014 - 019
      • Web Components - Template - 1505040789
      • Wearable DataLayer API - 1505050792
      • Using srcset for responsive images - 1505050790
      • The picture element for art direction - 1505050791
    • Uncategorized - 999
      • Sun Surveyor brings augmented reality to photographers using Google Maps APIs - 1504200668
      • Snappy travels with the Roads API - 1503060392
      • Easy Maps Apps in Java and Python - 1501140030
  • Google 广告平台
  • Polymer
    • Polycasts - 076
      • The Awesome Power of Auto-Binding Templates -- Polycasts #08 - 1502220382
      • Content Switcheroo with Core-Pages -- Polycasts #09 - 1502200380
      • Core Iconset -- Polycasts #02 - 1505040788
  • Web 平台
    • HTTP 203 - 062
      • Gotchas - 1501140368
      • Font Rendering - 1501080016
    • Web Components - 081
      • DevBytes: Web Components - Overview - 1504250709
  • 宣传视频
    • Uncategorized - 999
      • Google Developers - 1501150369
      • I/O Extended 2014 - Join me - 1502220383
  • Google 各类开发者会议
    • 2014 Chrome 开发者高峰会议 - 009
      • Keynote - Chrome Dev Summit 2014 (Darin Fisher) - 1503120407
      • TLS All the Things! - Security with Performance(Chris Palmer) - 1503140412
      • Let’s build some apps with Polymer!(Rob Dodson) - 1503150415
      • Day One Closing Remarks(Sundar Pichai) - 1503150417
      • Chrome Leadership panel - 1503160422
      • Fundamentals of Mobile Web Development(Matt Gaunt) - 1503150416
    • 2015 游戏开发者大会中 - 039
      • FlatBuffers - 1504150640
      • Games for Google Cast - 1504150637
      • Top 10 Things Android Game Developers Should Know v 3.0 - 1504150643
      • Automate Publishing for Google Play APIs - 1504150639
      • 3 Game Design Mistakes You're Making - 1504150636
      • Android TV - 1504150638
      • How to Go Viral Without Really Trying - 1504150641
    • Devoxx 2014 Interviews - 024
      • What's new in Android 5.0 Lollipop - 1504260740
      • Android Tools - 1504260743
      • BigQuery and user-defined functions - 1504260744
    • IO Bytes 2014 - 065
      • Dart in Google Cloud - 1505070810
      • Big genomic data on Google Cloud Platform - 1505070811
      • Easy International Checkout with Chrome - 1505070802
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      • Whet your appetite with IO Bytes - 1501080021
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      • 主题演讲 Chris Yerga - 1504060549
      • 如何成功地开发你的应用 Ellie Powers - 1504060550
      • 在Google上营利 Brahim Elbouchikhi - 1504060551
      • Playtime Shanghai event sizzle reel - 1504070552
    • Project Google I/O 2015 - 098
      • Project Tango Mobile 3D tracking and perception - 1506120857
      • Democratizing Education - 1506120868
      • Improve your Android app’s accessibility - 1506120864
      • Google Cloud Messaging 3.0 - 1506120844
      • Developers connecting the world through Google Play - 1506120862
  • 开源开放技术
    • Compressor Head - 013
      • The Trailer, Season 2 - 1503060385
      • Behind the Scenes - 1503210441
      • Arithmetic Compression (Ep 5, Compressor Head) Google - 1503070394
      • Introducing Compressor Head - 1502120372
      • Episode 1 (Variable Length Codes) - 1502120373
      • Episode 2 (The LZ77 Compression Family) - 1502120374
      • Episode 3 (Markov Chain Compression) - 1502120375
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  • 解说词中文版：

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  1. Android 平台
  2. Android 性能优化 - 088

Invalidations, Layouts, and Performance - 1501130357

PreviousAndroid UI and the GPU - 1501130356NextOverdraw, Cliprect, QuickReject - 1501130358

Last updated 5 years ago

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视频发布时间

2015年1月6日

视频介绍

视频推介语

暂无，待补充。

译者信息

翻译

润稿

终审

原始链接

中文字幕

翻译流水号

加入字幕组

周亿

姜昭宇、Kesen

——

1501130357

解说词中文版：

顺滑精妙的动画是App设计里面最重要的元素之一

这些动画能够显著提升用户体验

但是很容易忘记他们可能会花费你的性能

我是Colt McCanlis

如果你要写一个高性能的Android应用程序

你应该先了解Android系统是

如何处理UI组件的更新操作的

为了在你的设备上绘制一些东西

Android需要将高级的XML转换成

GPU能够使用的东西以便渲染到屏幕上

这是通过一个被称为显示列表内的对象的帮助实现的

一个显示列表基本包含了所有GPU需要的渲染信息

它包含一个GPU可能需要的常用资源列表

同样也包含了渲染时需要的OpenGL命令列表

在某个视图第一次需要被渲染时

DisplayList就会因此而被创建

当这个视图要显示到屏幕上时

我们会执行GPU的绘制指令来进行渲染

如果你在后续有执行类似移动这个视图的位置等操作

而需要再次渲染这个视图时

我们就仅仅需要额外操作一次渲染指令就够了

然而如果你修改了视图中的某些可见组件

那么之前的DisplayList就无法继续使用了

我们需要回头重新创建一个DisplayList

并且重新执行渲染指令并更新到屏幕上

再执行新的列表 从而更新屏幕

但是记住这个

任何时候视图中的绘制内容发生变化时

都会重新执行创建DisplayList

渲染DisplayList

更新到屏幕上等一系列操作

这个流程的表现性能

取决于你的视图的复杂程度

取决于视图的状态变化也包括渲染管道的执行性能

举个例子 假设某个按钮的大小需要增大到目前的两倍

在增大按钮大小之前

需要通过父视图重新计算并摆放其他子视图的位置

在这种情况下 我们更新了一个视图

但是与其他需要被完成的任务连在了一起

这些类型的视觉变化

需要在附加的阶段执行渲染流水线

你看 当你的视图改变时

便开始进行测量的工作

修改视图的大小会触发整个

Hierarcy视图的重新计算大小的操作

如果你改变布局样式 可以调用布局模块

或者用视图组件重构它的子类

布局从这开始 遍历层次结构

确定每一个组件位置

你必须意识到

每一个阶段都需要时间来运行

引起性能问题的一个很重要的方面

是因为过多复杂的绘制操作

如果突然出现大量的无效或者重新定位的视图

这会带来一个巨大的性能问题

而尽量减少无效布局可以提高整体的性能

当然 你可能需要一些办法来在你的问题出现的地方

获取更详细的错误信息

首先 你可以在设备上使用

Profile GPU rendering工具

来更好的观察哪个部分的渲染有问题

这会给你在创建 执行和处理绘制操作上带来方便

这会给你一个方便的绘画线管的创建

执行和处理的时间花费快照

另外也可以通过开发者选项里面的

Show GPU view updates来查看

视图更新的操作

当你的应用程序不响应时

你会看到未响应部分闪着提示红光

无论未响应块有多少

它都可以帮助到你解决问题

最后我们还可以通过

HierarchyViewer这个工具来查看布局

使得布局尽量扁平化

移除非必需的UI组件

这些操作能够减少

Measure Layout的计算时间

但是这也仅仅是个开始

想要获取更多关于减少无效视图

扁平化你的层次结构和使用硬件层的信息

请查看Android Performance Patterns的其他视频

别忘了加入Google+来获取更多的好的提示和技巧

代码分析 你值得拥有 性能问题 永不能忘

Views are the backbone of your Android Activity, but have you ever really understood how much updating the visual properties of a view affects your performance? In order to hit the middle ground between performance and flexibility, Android’s UI Toolkit must execute a number of stages to prepare data before rendering it to the screen. So every time you change one of those views, this pipeline has to spin up, and start doing work again.In this video, +Colt McAnlis introduces the required stages of the rendering pipeline, and describes what actions in your application will trigger each of them to occur.Watch more Android Performance Patterns here:

https://goo.gl/3dBbse
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