docs: Wear preview docs: Get Started, Download/Test, Program Overview

page.title=Preview Downloads

meta.tags="wear-preview", "system image", "download"

page.tags="wear"

page.image=images/cards/card-n-downloads_2x.png

page.title=Download and Test with a Device

meta.keywords="wear-preview"

page.tags="wear-preview"

page.image=images/cards/card-n-sdk_2x.png

@jd:body

<div style="position:relative; min-height:600px">

  <div class="wrap" id="tos" style="position:absolute;display:none;width:inherit;">

    <div id="qv-wrapper">

      <div id="qv">

    <h2>In this document</h2>

      <ol>

        <li><a href="#device-preview">Set up a hardware device</a>

        <ol>

            <li><a href="#flash">Flash a device</a></li>

            <li><a href="#revertDevice">Uninstalling the Preview</a></li>

          </ol>

          <li>

            <a href="#set_up_a_watch">Set Up a Watch</a>

          </li>

          <li>

            <a href="#set_up_an_emulator">Set Up an Emulator</a>

          </li>

        <li><a href="#setupAVD">Set up an emulator</a></li>

        </ol>

      </div>

    </div>

    <p>

  To run and test your app with the Wear Developer Preview, you need to set up

  a runtime environment. You can do that in either of these ways:

      You can run and test your app with the Android Wear 2.0 Developer Preview

      in either of these ways:

    </p>

    <ul>

  <li>Install a Wear Preview system image on a supported hardware device,</li>

  <li>Set up an Android emulator running the Wear Developer Preview</li>

      <li>Install Android Wear 2.0 on a supported watch, or

      </li>

      <li>Set up an emulator that is running Android Wear 2.0

      </li>

    </ul>

    <p>

  If you want an environment for basic compatibility testing of your app on the

  new platform, all you need is your current APK and a hardware device or

  emulator. You don't necessarily need to update your full development

  environment to do basic testing.

      If you want an environment for basic <strong>compatibility

      testing</strong> of your app, you can use your current APK and a

      supported watch or an emulator. As described below, you don't necessarily

      need to update your full development environment to do basic testing.

    </p>

    <p>

      However, if you want to <strong>modify</strong> your app to target

      Android Wear 2.0 or use new APIs, you need to update your development

      environment. See <a href="{@docRoot}wear/preview/start.html">Get Started

      with the Android Wear 2.0 Preview</a>.

    </p>

    <h2 id="set_up_a_watch">

      Set Up a Watch

    </h2>

    <p>

  If you want to modify your app to target the Wear Preview or use the Wear

  Preview APIs, you need to set up a development environment that's updated

  to support the Wear Preview. For more information, see

  <a href="{@docRoot}wear/preview/start.html">Get Started with Wear Preview</a>.

      You can download a system image and manually flash it to a matching

      watch. See the table below to download the system image for your test

      watch.

    </p>

    <p>

      Manually flashing a watch is useful if you need precise control over the

      test environment or need to reinstall frequently, such as for automated

      testing.

    </p>

<h2 id="downloads">Download Files</h2>

    <p>

      Installing a system image on a watch <strong>removes all data from the

      watch</strong>, so you should back up your data first.

    </p>

    <h3 id="preview_system_images">

      Preview system images

    </h3>

    <p>

      The preview includes system images for testing your app. Based on your

      device, you can download a preview system image from the following tables

      and flash it to the corresponding device.

    </p>

<h3 id="docs-dl">Reference documentation</h3>

    <h4 id="preview_image_for_lge_watch_urbane_2nd_edition">

      Preview image for LGE Watch Urbane 2nd Edition

    </h4>

    <p>

  Detailed information about the Wear Preview APIs is available in the

  reference documentation, which you can download from the following table.

  This package contains an abridged, offline version of the Android developer

  web site, and includes an updated API reference for the Wear Preview APIs

  and an API difference report.

      <strong>Please note the following:</strong>

      Flashing your device will

      require unlocking the bootloader which may

      void the device's warranty--proceed at your own risk.

     </p>

    <table>

      <tr>

    <th scope="col">Documentation</th>

    <th scope="col">Checksums</th>

        <th scope="col">

          Type of LGE Watch Urbane 2nd Edition image

        </th>

        <th scope="col">

          Download/Checksums

        </th>

      </tr>

  <tr>

    <td style="white-space: nowrap">

    <a href="{@docRoot}shareables/preview/n-preview-1-docs.zip"

      >n-preview-1-docs.zip</a></td>

    <td width="100%">

      MD5: 4ab33ccbe698f46f125cc5b807cf9c2f<br>

      SHA-1: 6a3880b3ccd19614daae5a4d0698ea6ae11c20a5

      <tr id="download-3-placeholder">

        <td>

          Preview image for testing

        </td>

        <td><a href="#top" onclick="onDownload(this)">download-3-placeholder.tgz</a><br>

          MD5: [string]<br>

          SHA-1: [string]

        </td>

      </tr>

<table>

      <tr id="download-4-placeholder">

        <td>

          Non-preview image (for after testing)

        </td>

        <td><a href="#top" onclick="onDownload(this)">download-4-placeholder.tgz</a><br>

          MD5: [string]<br>

          SHA-1: [string]

        </td>

      </tr>

    </table>

<h3 id="images-dl">Device system images</h3>

    <h4 id="preview_image_for_huawei_watch">

      Preview image for Huawei Watch

    </h4>

    <p>

  The following device system images can be used to update a compatible device

  with the Wear Preview for testing. For information on installing these

  images, see <a href="#device-preview">Set up a Hardware Device</a>.

      <strong>Please note the following:</strong>

      Flashing your device will require unlocking

      the bootloader which

      shall void the device's warranty--proceed at your own risk.

    </p>

    <table>

      <tr>

    <th scope="col">Device</th>

    <th scope="col">Download / Checksums</th>

        <th scope="col">

          Type of Huawei Watch image

        </th>

        <th scope="col">

          Download/Checksums

        </th>

      </tr>

  <tr id="sprat">

    <td>Gear Live <br>"sprat"</td>

    <td><a href="#top" onclick="onDownload(this)"

      >sprat-XXXXX-preview-d86c7559.tgz</a><br>

      MD5: d84b6c31a7754e505149594887b3481a<br>

      SHA-1: d86c7559c93724cca6af91040b012c48529f2c94

      <tr id="download-1-placeholder">

        <td>

          Preview image for testing

        </td>

        <td><a href="#top" onclick="onDownload(this)">download-1-placeholder.tgz</a><br>

          MD5: [string]<br>

          SHA-1: [string]

        </td>

      </tr>

      <tr id="download-2-placeholder">

        <td>

          Non-preview image (for after testing)

        </td>

        <td><a href="#top" onclick="onDownload(this)">download-2-placeholder.tgz</a><br>

          MD5: [string]<br>

          SHA-1: [string]

        </td>

      </tr>

    </table>

    <h3 id="flash_a_watch">

      Flash a watch

    </h3>

    <p>

      The steps for flashing an image to a watch are similar to the <a href=

      "https://developers.google.com/android/nexus/images">steps provided for

      flashing to a phone</a>. After you <strong>back up your watch

      data</strong>, use steps in this section to flash the image to the

      <strong>specific watch</strong> that matches the image (e.g., you must

      use an LGE Watch Urbane 2nd Edition for the corresponding image).

    </p>

<h2 id="device-preview">Set up a Hardware Device</h2>

    <h4 id="set_up_the_watch_to_be_flashed">

      Set up the watch to be flashed

    </h4>

    <p>

  The Wear Developer Preview offers system updates for a range of hardware devices

  that you can use for testing your app, from phones to tablets and TV.

      On the watch, enable the Developer Options menu and ADB debugging as

      follows:

    </p>

    <ol>

      <li>Open the Settings menu on the watch.

      </li>

      <li>Scroll to the bottom of the menu. If no <strong>Developer

      Options</strong> item is provided, tap <strong>About</strong>.

      </li>

      <li>Tap the build number 7 times.

      </li>

<h3 id="flash">Flash a device</h3>

      <li>From the Settings menu, tap the <strong>Developer Options</strong>

      item.

      </li>

      <li>Enable ADB debugging.

      </li>

    </ol>

    <h4 id="confirm_installation_of_the_fastboot_tool">

      Confirm installation of the fastboot tool

    </h4>

    <p>

  At any time you can download the latest Developer Preview system image and

  manually flash it to your device. See the table below to download the system

  image for your test device. Manually flashing a device is useful if you need

  precise control over the test environment or need to reinstall frequently,

  such as for automated testing.

      To flash a device using one of the <a href=

      "#preview_system_images">system images</a>, confirm that you have the

      <code>fastboot</code> tool in the <code>platform-tools/</code> directory

      of the <a href="https://developer.android.com/sdk">Android SDK</a>. Be

      sure that you have the latest version of the <strong>Android SDK

      Platform-tools</strong> from the <a href=

      "{@docRoot}tools/help/sdk-manager.html">SDK Manager</a>.

    </p>

    <p>

  Installing a system image on a device <strong>removes all data from the

  device</strong>, so you should back up your data first.

      After you confirm that you have the <code>fastboot</code> tool, add the

      tool to your PATH environment variable so the tool can be found when you

      flash the watch.

    </p>

    <h4 id="transfer_the_image_to_the_watch">

      Transfer the image to the watch

    </h4>

    <p>

  After you back up your device data and download the system image below that

  matches your device, follow the instructions at <a href=

  "https://developers.google.com/android/nexus/images#instructions">developers.google.com/android</a>

  to flash the image onto your device.

      To download a preview image and flash it to the watch:

    </p>

    <ol>

      <li>Download and unzip the appropriate system image from the "Preview

      system image" column in the <a href="#preview_system_images">table

      above</a>.

      </li>

<h3 id="revertDevice">Uninstalling the Preview</h3>

      <li>Attach the watch charger to the watch and plug the USB cord (from the

      charger) into your computer.

      </li>

<p>

  If you want to uninstall the preview from a device, you can do so in one of

  these ways: </p>

  <ul>

    <li><strong>Obtain a factory spec system image</strong> and then manually

    flash it to the device.

      <ul>

          <li>For <strong>Nexus devices and Pixel C devices</strong>, see

        the <a href="http://developers.google.com/android/nexus/images">Factory Images

        for Nexus Devices</a> page for downloads. </li>

        <li>For <strong>other devices</strong>, please contact the device manufacturer

        directly. Alternatively, if the device is supported

        in the Android Beta Program, you can enroll the device in the

        program and then un-enroll it (see below).</li>

      </ul>

      <li>Use the following <a href="{@docRoot}tools/help/adb.html">adb

      command</a> to confirm that the watch is available for flashing:

      <code>adb devices</code>

      </li>

    <li><strong>Un-enroll the device from Android Beta Program</strong>. If the

    device is enrolled in the <a href="https://g.co/androidbeta">Android Beta

    Program</a>, regardless of device, you can simply un-enroll it from the program.

      <li>Use the following adb command to start the device in fastboot mode:

      <code>adb reboot bootloader</code>

      </li>

      <li>If necessary, use <strong>one</strong> of following two commands to

      unlock the device's bootloader. This step <strong>erases all data on the

      device</strong>: <code>fastboot flashing unlock</code> or, for some

      devices, <code>fastboot oem unlock</code>

      </li>

      <li>Navigate to the directory where you unzipped the system image in Step

      1.

      </li>

      <li>Execute the <code>flash-all</code> script by typing

      <code>flash-all.sh</code> or, in the case of Windows,

      <code>flash-all.bat</code>.

      </li>

    </ol>

    <p>

    The device will receive an OTA update to the most recent production version

    of Android available for that device (for example, Android 6.0 Marshmallow).

    The update requires a full device reset, so user data on the device will be

    removed. Make sure to <strong>back up important data</strong> before

    un-enrolling a device.

      After the script finishes, your watch reboots. Pair the watch with a

      phone or tablet. The preview now is available for testing on the watch.

      Before installing an app, enable the Developer Options menu, and ADB

      debugging, on the watch as follows:

    </p>

    <ol>

      <li>Open the Settings menu (on the watch).

      </li>

</ul>

<p class="note"><strong>Note:</strong>

  Uninstalling a Developer Preview system image prior to

  the end of the program requires a full device reset and removes all user data

  on the device.

</p>

      <li>Scroll to the bottom of the menu and tap <strong>About</strong>.

      </li>

      <li>Tap the build number 7 times.

      </li>

<h2 id="setupAVD">Set up an emulator</h2>

      <li>From the Settings menu, tap the <strong>Developer Options</strong>

      item.

      </li>

<p>To use the Android Emulator to run the Wear Preview, you need to

download the Wear Preview SDK and create a virtual device for the

emulator.</p>

      <li>Enable ADB debugging.

      </li>

<p>First, download the Wear Preview SDK as follows (if you

already got it while <a href="{@docRoot}preview/setup-sdk.html">setting up

to develop for Android N</a>, you can skip this part):

      <li>Connect the watch to your computer and tap <strong>Always allow from

      this computer</strong>.

      </li>

    </ol>

    <p>

      Your watch is ready for you to <a href=

      "{@docRoot}training/wearables/apps/creating.html#Install">install and run

      your app</a>:

    </p>

    <ol>

  <li>In Android Studio, open the Settings dialog

    (<strong>File &gt; Settings</strong> on Windows/Linux, or

    <strong>Android Studio &gt; Preferences</strong> on Mac). In the left

    panel, select <strong>Appearance &amp; Behavior &gt;

  System Settings &gt; Android SDK</strong>.

      <li>Open your app in Android Studio.

      </li>

  <li>Click the <strong>SDK Platforms</strong> tab, then select the

  <strong>Wear Preview</strong> check box.</li>

      <li>Select <strong>wear</strong> from the Run/Debug configuration

      drop-down menu.

      </li>

  <li>Click the <strong>SDK Tools</strong> tab, then select the

    <strong>Android SDK Build Tools</strong>, <strong>Android SDK

    Platform-Tools</strong>, and <strong>Android SDK Tools</strong> check

    boxes.

      <li>Click the Play button.

      </li>

  <li>Click <strong>OK</strong> and accept the license

    agreements for any packages to be installed.

      <li>In the Select Deployment Target box, click your device.

      </li>

    </ol>

<p>You should now have <strong>Android SDK Built-Tools 24.0 0 rc1</strong>,

<strong>Platform-Tools 24.0.0 rc1</strong>, and <strong>SDK Tools

25.0.9</strong>. If you do not update the SDK Tools to 25.0.9, then you won't

be able to run the x86_64 system images for Android N.</p>

    <p>

      After your app is installed on the watch, you are prompted to start the

      app on the watch.

    </p>

    <p>

      When testing is completed, follow the steps for <a href=

      "#uninstall_the_preview_from_a_watch">uninstalling the preview</a>.

    </p>

<p>Now create a virtual device with the Wear Preview system image:</p>

    <h3 id="uninstall_the_preview_from_a_watch">

      Uninstall the preview from a watch

    </h3>

    <p>

      When testing with the preview is done, restore the watch as follows:

    </p>

    <ol>

  <li>Open the AVD Manager by selecting <strong>Tools > Android >

    AVD Manager</strong>.</li>

  <li>Click <strong>Create Virtual Device</strong>.</li>

  <li>Select a device such as Nexus 5X, Nexus 6P, Nexus 9, or Android TV,

    then click <strong>Next</strong>.</li>

  <li>Select the <strong>N</strong> system image (with the

    <strong>x86</strong> ABI), then click <strong>Next</strong>.

    (Only x86 system images are currently supported with the Android Emulator

for the Wear Preview.)

  <li>Complete the rest of the AVD configuration and click

    <strong>Finish</strong>.</li>

      <li>Download and unzip the appropriate system image from the "Non-preview

      system image" column in the <a href="#preview_system_images">table

      above</a>.

      </li>

      <li>Manually flash the image to the watch using steps similar to those in

      <a href="#transfer_the_image_to_the_watch">Transfer the image to the

      watch</a>, except that you flash the <strong>non-preview</strong> image

      to the watch.

      </li>

    </ol>

<p>You can now launch the Android Emulator with the Wear Preview AVD.</p>

    <p>

      <strong>Note</strong>: Removing a preview system image requires a full

      device reset and removes all user data on the device.

    </p>

    <h2 id="set_up_an_emulator">

      Set Up an Emulator

    </h2>

    <p>

For the best experience in the Android Emulator, install

Android Studio 2.2 Preview, which supports the <a

href="http://tools.android.com/tech-docs/emulator">Android Emulator 2.0 Beta</a>

with much faster performance compared to the Emulator in

Android Studio 1.5.</p>

<p>For more information about creating virtual devices, see <a href=

  "{@docRoot}tools/devices/index.html">Managing Virtual Devices</a>.

      To test with the Android Emulator, create a virtual device in Android

      Studio as follows:

    </p>

    <ol>

      <li>Open the AVD Manager by selecting <strong>Tools &gt; Android &gt; AVD

      Manager</strong>.

      </li>

      <li>Click <strong>Create Virtual Device</strong>.

      </li>

      <li>In the <strong>Category</strong> pane, select Wear, choose a name

      (such as Android Wear Round), and click <strong>Next</strong>.

      </li>

      <li>Select an <strong>N</strong> image to download. The images may be on

      the <strong>x86</strong> tab instead of the <strong>Recommended</strong>

      tab, until installed. For example, select the image with the

      <strong>Release Name</strong> of N, the <strong>API Level</strong> of N,

      and the <strong>Target</strong> of "Android 6.X (with Android Wear)".

      When the download and installation are complete, click

      <strong>Finish</strong> and then click <strong>Next</strong>.

      </li>

      <li>Verify the configuration of the Android Virtual Device (AVD) and

      click <strong>Finish</strong>.

      </li>

    </ol>

    <p>

      You can now test an application in the <a href=

      "{@docRoot}tools/devices/emulator.html">Android Emulator</a>. For more

      information about using virtual devices, see <a href=

      "{@docRoot}tools/devices/managing-avds.html">Managing AVDs with the AVD

      Manager</a>.

    </p>

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