Docs: New "Power" area for "Performance" section on DAC.

toc:

- title: Reducing Network Battery Drain

  path: /topic/performance/power/network/index.html

- title: Optimizing for Battery Life

  path: /topic/performance/power/index.html

  path_attributes:

  - name: description

    value: Access the network while going easy on battery life.

    value: Learn to make your app more battery-friendly.

  section:

  - title: Network Use and Battery Consumption

    path: /topic/performance/power/network/index.html

    section:

  - title: Collecting Network Traffic Data

    path: /topic/performance/power/network/gather-data.html

  - title: Analyzing Network Traffic Data

    - title: Analyzing Data Traffic

      path: /topic/performance/power/network/analyze-data.html

    - title: Optimizing User-Initiated Network Use

      path: /topic/performance/power/network/action-user-traffic.html

      path: /topic/performance/power/network/action-server-traffic.html

    - title: Optimizing General Network Use

      path: /topic/performance/power/network/action-any-traffic.html

- title: Implementing Doze

    - title: Smaller Network Resources

      path: /topic/performance/power/smaller-resources.html

  - title: Doze and App Standby

    path: /training/monitoring-device-state/doze-standby.html

    path_attributes:

    - name: description

      value: Help ensure the device isn't depleting the battery when not in use.

  - title: Battery Historian

    path: /topic/performance/power/battery-historian.html

- title: Reducing Overdraw

  path: /topic/performance/overdraw.html

- title: Using the Profile GPU Tool

  path: /topic/performance/profile-gpu.html

- title: Intelligent Job-Scheduling

  path: /topic/performance/scheduling.html

- title: Reducing Image Download Sizes

  path: /topic/performance/network-xfer.html

- title: Launch-Time Performance

  path: /topic/performance/launch-time.html

- title: Better Performance through Threading

  path: /topic/performance/optimizing-view-hierarchies.html

- title: Background Optimization

  path: /topic/performance/background-optimization.html

- title: Intelligent Job-Scheduling

  path: /topic/performance/scheduling.html

- title: Reducing APK Size

  path: /topic/performance/reduce-apk-size.html

page.title=Optimizing for Battery Life

page.metaDescription=Learn how to help your app go easier on the battery.

meta.tags="performance"

page.tags="performance"

@jd:body

<div id="qv-wrapper">

  <div id="qv">

    <h2>

      In this document

    </h2>

    <ol>

      <li>

        <a href="#lazy">Lazy First</a>

      </li>

      <li>

        <a href="#features">Platform Features</a>

      </li>

      <li>

        <a href="#toolery">Tooling</a>

      </li>

    </ol>

  </div>

</div>

<p>Battery life is the single most important aspect of the mobile user

experience. A device without power offers no functionality at all.

For this reason, it is critically important that apps be as respectful of

battery life as possible.</p>

<p>There are three important things to keep in mind in keeping your app

power-thrifty:</p>

<ul>

<li>Make your apps <em>Lazy First</em>.</li>

<li>Take advantage of platform features that can help manage your app's battery

consumption.</li>

<li>Use tools that can help you identify battery-draining culprits.</li>

</ul>

<h2 id="lazy">Lazy First</h2>

<p>Making your app Lazy First means looking for ways to reduce and optimize

operations that are particularly battery-intensive. The core questions

underpinning Lazy First design are:

<ul>

   <li><strong>Reduce:</strong> Are there redundant operations your app can cut

out? For example, can it cache downloaded data instead of repeatedly waking

   up the radio to re-download the data?</li>

   <li><strong>Defer:</strong> Does an app need to perform an action right

   away? For example,

    can it wait until the device is charging before it backs data up to the

    cloud?</li>

   <li><strong>Coalesce:</strong> Can work be batched, instead of putting the

   device

   into an active state many times? For example, is it really necessary for

   several dozen apps to each turn on the radio at separate times to send

   their messages? Can the messages instead be transmitted during a

   single awakening of the radio?</li>

</ul>

<p>

You should ask these questions when it comes to using the CPU,

the radio, and the screen. Lazy First design is often a good way

to tame these battery killers.

</p>

<p>

To help you achieve these and other efficiencies, the Android platform

provides a number of features to help maximize battery life.

</p>

<h2 id="features">Platform Features</h2>

<p>

Broadly speaking, the Android platform provides two categories of help

for you to optimize your app's battery use. First, it provides several

APIs that you can implement in your app. You can learn more about these APIs in

<a href="/topic/performance/scheduling.html">Intelligent Job Scheduling</a>

and <a href="/performance/power/network/index.html">

Network Use and Battery Consumption</a>.

</p>

<p>

There are also internal mechanisms in the platform to help conserve

battery life. While they are not APIs that you implement programmatically,

you should still be aware of them so that your app can leverage them

successfully. For more information, see

<a href="/training/monitoring-device-state/doze-standby.html">Doze and

App Standby</a>.</p>

<p>

You can get even more benefit out of these features by using the tools

available for the platform to discover the parts of your app that consume

the most power. Finding what to target is a big step toward

successful optimization.

</p>

<h2 id ="toolery">Tooling</h2>

<p>There are tools for Android, including

<a href="/studio/profile/dev-options-rendering.html">Profile GPU Rendering</a>

and <a class="external-link"

href="https://github.com/google/battery-historian">Battery Historian</a>

to help you identify areas that you can optimize for better battery life.

Take advantage of these tools to target areas where you can apply the

principles of Lazy First.

</p>

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