page.title=Batterystats & Battery Historian Walkthrough
meta.tags="android, performance, profiling, tools, battery, batterystats, historian, batterydrain
page.tags="android", "performance", "profiling", "tools", "battery", "batterystats", "historian", "batterydrain"
page.metaDescription=Collect battery usage data from your device and display it graphically in your browser.
page.image=tools/performance/thumbnails/tools_battery_historian.png
page.article=true


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<div id="tb" style="margin-left: 7px; margin-bottom: 5px;">

<h2>You should also read</h2>
<ul>
  <li><a href="{@docRoot}tools/performance/batterystats-battery-historian/charts.html">
    Battery Historian Charts</a></li>
  <li><a href="{@docRoot}tools/performance/systrace/index.html">
    Systrace Walkthrough</a></li>
</ul>

</div>

  <p>This walkthrough shows the basic usage and workflow for the Batterystats tool and the Battery
  Historian script.</p>

  <p>Batterystats collects battery data from your device, and Battery Historian converts that data
  into an HTML visualization that you can view in your Browser. Batterystats is part of the Android
  framework, and Battery Historian is open-sourced and available on GitHub at <a href=
  "https://github.com/google/battery-historian">https://github.com/google/battery-historian</a>.</p>

  <p>What it's good for:</p>

  <ul>
    <li>Showing you where and how processes are drawing current from the battery.</li>

    <li>Identifying tasks in your app that could be deferred or even removed to improve battery
    life.</li>
  </ul>

  <h2>Prerequisites</h2>

  <ul>
    <li>A mobile device with <a href=
    "http://developer.android.com/tools/device.html#developer-device-options">Developer Options</a>
    enabled running Android 5.0 or higher.</li>
  </ul>

  <h2>Working with Batterystats &amp; Battery Historian</h2>

  <div class="sidebox-wrapper" style="width:400px;">
      <div class="sidebox" style="width:350px;">
        <h2>Summary</h2>
          <code>
            <p><b>https://github.com/google/battery-historian</b></p>
            <p>&gt; adb kill-server</p>
            <p>&gt; adb devices</p>
            <p>&gt; adb shell dumpsys batterystats --reset</p>
            <p>&lt;disconnect and play with app&gt;...&lt;reconnect&gt;</p>
            <p>&gt; adb devices</p>
            <p>&gt;adb shell dumpsys batterystats &gt; batterystats.txt</p>
            <p>&gt; python historian.py batterystats.txt &gt; batterystats.html</p>
          </code>
      </div>
  </div>

  <ol>

    <li>Download the open-source Battery Historion Python script from GitHub (<a href=
    "https://github.com/google/battery-historian">https://github.com/google/battery-historian</a>).
    </li>

    <li>Unzip the file to extract the Battery Historian folder. Inside the folder,
      find the <code>historian.py</code> file
      and move it to the Desktop or another <em>writable</em> directory.</li>

    <li>Connect your mobile device to your computer.</li>

    <li>On your computer, open a Terminal window.</li>

    <li>Change to the directory where you've saved <code>historian.py</code>,
      <br>for example:
      <code>cd ~/Desktop</code></li>

    <li>Shut down your running adb server.
      <br><code>&gt; adb kill-server</code></li>

    <li>Restart adb and check for connected devices.
      <br><code>&gt; adb devices</code>
      <br><img src="{@docRoot}images/tools/performance/batterystats-battery-historian/gettingstarted_image01.png">
      <br>If you don't see any devices, make sure your phone is connected, and USB Debugging
      is turned on, and then kill and restart adb.</li>

    <li>Reset battery data gathering.
      <br><code>&gt; adb shell dumpsys batterystats --reset</code>
      <p>Resetting erases old battery collection data; otherewise, the output will be huge.</p>
    </li>

    <li>Disconnect your device from your computer so that you are only drawing current from the
    device's battery.</li>

    <li>Play with your app for a short time.</li>

    <li>Reconnect your phone.</li>

    <li>Make sure your phone is recognized: <code>&gt; adb devices</code></li>

    <li>Dump all battery data. This can take a while:
      <br><code>&gt; adb shell dumpsys batterystats &gt; batterystats.txt</code></li>

    <li>Create a HTML version of the data dump for Battery Historian:
       <br><code>&gt; python historian.py batterystats.txt &gt; batterystats.html</code></li>

    <li>Open the <code>batterystats.htm</code> file in your browser.</li>

    <li>Continue with <a href="{@docRoot}tools/performance/batterystats-battery-historian/charts.html">
        Battery Historian Charts</a>.
    </li>

    <div class="figure" style="">
      <img src="{@docRoot}images/tools/performance/batterystats-battery-historian/gettingstarted_image02.png"
         alt=""
      <p class="img-caption">
        <strong>Figure 1. </strong>Battery Historian output.
      </p>
    </div>
  </ol>