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      • 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
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      • Frequency Scaling - 1505050797
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      • Garbage Collection in Android - 1503170425
      • Performance Cost of Memory Leaks - 1503170424
      • Rendering Performance 101 - 1501130351
      • Understanding Overdraw - 1501130352
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      • 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
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      • Activity Transitions - 1504020505
      • Building Apps For Android TV - 1504020520
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      • App Indexing API - 1504020507
      • What's new in WebView - 1504010484
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      • 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
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      • 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
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      • Layout Editor (Ep 3, Android Studio) - 1503290479
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      • Introduction to Android Auto - 1504130615
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      • Designing for Android Wear - 1503210448
      • How We Customized Google Apps for Android Wear - 1503210450
      • Fullscreen apps for Android Wear - 1503210445
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      • 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
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      • 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
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      • Using the PageSpeed API - 1505070815
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      • 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
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    • Coffee with a Googler - 012
      • Chat with Allen Huang of AndroidTV - 1503040384
      • Chat with Fred Chung about developer advocacy - 1503070395
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      • Android Auto Product Manager Andrew Brenner - 1501120027
      • Chat with Francis Ma about Google Play services - 1501120028
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      • What we learned building plug-ins for Android, with startup Magnet - 1503230453
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      • Getting started with Android: A crash-course in developing for Android - 1504120601
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      • Use BigQuery to find my most valuable customers - 1504070573
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      • Introduction to Google Cloud Endpoints - 1504210675
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      • The Setup: Creating new apps using Google APIs - 1503190428
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      • 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
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      • Maps Live: New Features in the Google Maps Mobile APIs for Android and iOS - 1504300777
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      • 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
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      • Getting started with the Google Maps SDK for iOS, Part 1 - 1504270757
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      • 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
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      • Web Components - Template - 1505040789
      • Wearable DataLayer API - 1505050792
      • Using srcset for responsive images - 1505050790
      • The picture element for art direction - 1505050791
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      • 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
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  • 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
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    • HTTP 203 - 062
      • Gotchas - 1501140368
      • Font Rendering - 1501080016
    • Web Components - 081
      • DevBytes: Web Components - Overview - 1504250709
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      • Keynote - Chrome Dev Summit 2014 (Darin Fisher) - 1503120407
      • TLS All the Things! - Security with Performance(Chris Palmer) - 1503140412
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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

Battery Drain and WakeLocks - 1501130366

PreviousUnderstanding Battery Drain on Android - 1501130365NextMemory Performance 101 - 1504170661

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视频发布时间

2015年1月6日

视频介绍

It’s no secret that in order for your app to be successful, the user has to run it. And for it to continue to provide value, sometimes it needs to keep running. But this is tough to do while the phone is sleeping. But the answer is simple right? Just wake it up and do the work! Maybe, but tread lightly here…. there’s a massive battery problem waiting to happen.

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译者信息

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周亿

姜昭宇、Kesen

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1501130366

解说词中文版：

众所周知 如果一个应用程序想要获得成功

就要有用户来使用它

而且为了能够持续为用户提供服务

有些时候可能会需要后台运行

但是当手机是休眠状态的话就有点不开心了

我的意思是 如果用户的手机已经休眠

你要把它唤醒才能去做点什么

这是真的 这不是梦

但是这里隐藏着一个巨大的耗电问题

我是Colt McAnlis

手机休眠状态下持续被应用打扰

这将会消耗更多的电量

但是只要一点点小的改动

你就能以更小的电耗达到相同的目的

为了说明这一点

我拿我的好盆友Rado举个例子

他是一个社交达人 游戏玩家

也就是说他要运行的手机程序

基本都是比如检查积分榜

上传照片 不停的上Twitter刷新

标签#crazes查看内容

这些应用程序在Rado手机休眠状态下还在继续跑

于是乎才到了午间十分 他的手机就么有电啦

Rado不得不给手机不断充电

这都是手机没有休眠造成的

也就是说 这些应用程序不断地唤醒手机

它们缩短了电池持续续航时间

而不是让手机好好休眠 而休眠是很重要的

Android系统会关掉部分硬件来节约耗电

首先 屏幕变暗

然后完全关闭 之后CPU也进入休眠

这一切都是为了节省宝贵的电池资源

即便在这种非活跃状态

大多数的程序也会尝试通过唤醒手机的方式继续工作

唤醒手机最简单的办法是用

PowerManager.Wakelock API接口

它会保持CPU运行 防止屏幕变暗或者关闭

这样你的手机就能在未来某一时间唤醒

做一些工作 然后在接着休眠

最后 也是最微妙的一点

使用Wakelock非常简单

难的是怎么去释放它

掉坑的方式有很多种

但是如果在上传到服务器之前

你的应用需要花60分钟而不是10秒来分析这些图像

或者是服务器跪了

你永远也得不到社交媒体的响应

难道应用程序就应该苦苦等候么

结局就是 手机一直没有休眠 一直在耗电

这时候 你就可以使用

wakelock.acquire外加一个超时参数

它会在一段时间里强制让Wakelock释放

以防上述事件发生

但是这也不能完全解决问题

那么 多久才算超时呢

第一次超时之后 等待多久再次尝试呢

正确的解决方案是使用非精准定时器

通常情况下 你设定了一下时间来触发事件唤醒手机

但是最好改一下这个时间 以便节省电量

例如 如果有另外一个程序需要

比你设定的时间晚5分钟唤醒

最好能够等到那个时候

两个任务捆绑一起同时进行

这就是非精确定时器的核心工作原理

我们可以定制计划的任务

可是系统如果检测到一个更好的时间

它可以推迟你的任务 以节省电量消耗

在现实世界里 有很多情况下

都可以节省电耗 比如充电时

连接WIFI时 抑或是设备

被另外一个进程唤醒的时候

如果你把任务都安排在上述情况下进行

那么就可以显著的提高电池寿命

这正是JobScheduler API所做的事情

它会根据当前的情况与任务

组合出理想的唤醒时间

例如等到正在充电或者连接到WiFi的时候

或者集中任务一起执行

我们可以通过这个API实现很多免费的调度算法

不要忘记用户已经可以看到每个应用程序的耗电情况了

并且可以在该界面直接与你的软件说拜拜了

也就是说你也许应该花一些时间用

Battery Historian工具来看看

你应用程序的唤醒逻辑是否合适咯

这个工具随着Android L发布了

它可以在一个漂亮的界面查看程序被唤醒的频率

由谁唤醒的 持续了多长的时间等等

有了这些新的工具和接口

你应该可以让手机的休眠时间得到充分保障啦

还有 如果 你想避免设备休眠

那么去查看Android Performance Patterns系列视频吧

同样别忘了加入G+社群与我们沟通

代码分析 你值得拥有 性能问题 永不能忘

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