docs/html/google/play-services/setup.jd

page.title=Setup
@jd:body


<p>
    The Google Play services SDK is an extension to the Android SDK and is available to you as a
    downloadable package from the <a href="{@docRoot}tools/help/sdk-manager.html">SDK
    Manager</a>. The download includes the client library and code samples.
</p>

<p>You must download the Google Play services SDK in order to develop using the
<a href="{@docRoot}reference/gms-packages.html">Google Play services APIs</a>. However, <strong>you
cannot use the Android emulator</strong> to test an app that depends on the Google Play services
APIs&mdash;you must use a real device running Android 2.2 or higher that includes
Google Play Store.</p>


<p>To install the Google Play services SDK for development:</p>

<ol>
  <li>Launch the SDK Manager.
   <ul>
    <li>From Eclipse (with <a href="{@docRoot}tools/help/adt.html">ADT</a>),
    select <strong>Window</strong> &gt; <strong>Android SDK Manager</strong>.</li>
    <li>On Windows, double-click the <code>SDK Manager.exe</code> file at the root of the Android
  SDK directory.</li>
    <li>On Mac or Linux, open a terminal and navigate to the <code>tools/</code> directory in the
  Android SDK, then execute <code>android sdk</code>.</li>
    </ul>
  </li>
  <li>
      Scroll to the bottom of the package list, select <b>Extras &gt; Google Play services</b>,
      and install it.
      <p>The Google Play services SDK is saved in your Android SDK environment at
      <code>&lt;android-sdk-folder&gt;/extras/google/google_play_services/</code>.</p>
  </li>
  <li>Copy the <code>&lt;android-sdk-folder&gt;/extras/google/google_play_services/libproject/google-play-services_lib</code>        
      library project into the source tree where you maintain your Android app projects.
  <p>If you are using Eclipse, import the library project into your workspace. Click <b>File > Import</b>, select <b>Android > Existing
  Android Code into Workspace</b>, and browse to the copy of the library project to import it.</p>
  </li>
</ol>


<p>To set up a project to use the Google Play services SDK:</p>

<ol>
  <li>Reference the library project in your Android project.
      <p>See the 
      <a href="{@docRoot}tools/projects/projects-eclipse.html#ReferencingLibraryProject">Referencing a Library Project for Eclipse</a>
      or <a href="{@docRoot}tools/projects/projects-cmdline.html#ReferencingLibraryProject">Referencing a Library Project on the Command Line</a>
      for more information on how to do this.</p>
      <p class="note"><strong>Note:</strong>
      You should be referencing a copy of the library that you copied to your
      source tree&mdash;you should not reference the library from the Android SDK directory.</p>
  </li>
  <li>If you are using <a href="{@docRoot}tools/help/proguard.html">ProGuard</a>, add the following
      lines in the <code>&lt;project_directory&gt;/proguard-project.txt</code> file
      to prevent ProGuard from stripping away required classes:
<pre>
-keep class * extends java.util.ListResourceBundle {
    protected Object[][] getContents();
}
</pre>
</ol>

<h2 id="ensure">Ensuring Devices Have the Google Play services APK</h2>
<p>As described in the <a href="{@docRoot}google/play-services/index.html">Google Play services
introduction</a>, Google Play delivers service updates for users on
Android 2.2 through the Google Play Store app. However, updates might not reach
all users immediately.</p>

<p class="caution">
<strong>Important:</strong>
    Because it is hard to anticipate the state of each device, you must <em>always</em> check for a
    compatible Google Play services APK in your app before you access Google Play services
    features.  For many apps, the best time to check is during the
    {@link android.app.Activity#onResume onResume()} method of the main activity.
</p>

<p>Here are four scenarios that describe the possible state of the Google Play services APK on
a user's device:</p>
<ol>
    <li>
        A recent version of the Google Play Store app is installed, and the most recent Google Play
        services APK has been downloaded.
    </li>
    <li>
        A recent version of the Google Play Store app is installed, but the most recent Google Play
        services APK has <em>not</em> been downloaded.
    </li>
    <li>
        An old version of the Google Play Store app, which does not proactively download Google Play
        services updates, is present.
    </li>
    <li>
        The Google Play services APK is missing or disabled on the device, which might happen if the
        user explicitly uninstalls or disables it.
    </li>
</ol>
<p>
    Case 1 is the success scenario and is the most common. However, because the other scenarios can
    still happen, you must handle them every time your app connects to a Google Play service to
    ensure that the Google Play services APK is present, up-to-date, and enabled.
</p>
<p>
    To help you, the Google Play services client library has utility methods to
    determine whether or not the Google Play services APK is recent enough to support the
    version of the client library you are using.  If not, the client library sends users to the
    Google Play Store to download the recent version of the Google Play services APK.
</p>

<p class="note">
<b>Note:</b>
<span>
    The Google Play services APK is not visible by searching the Google Play Store. The client
    library provides a deep link into the Google Play Store when it detects that the device has a
    missing or incompatible Google Play services APK.
</span>
</p>

<p>
    It is up to you choose the appropriate place in your app to do the following steps to check for
    a valid Google Play services APK. For example, if Google Play services is required for your app,
    you might want to do it when your app first launches. On the other hand, if Google Play services
    is an optional part of your app, you can do these checks if the user navigates to that portion
    of your app:
</p>

<ol>
    <li>
        Query for the status of Google Play services on the device with the
<a href="{@docRoot}reference/com/google/android/gms/common/GooglePlayServicesUtil.html#isGooglePlayServicesAvailable(android.content.Context)"
>{@code isGooglePlayServicesAvailable()}</a> method, which returns a result code.
    </li>
    <li>
        If the result code is
<a href="{@docRoot}reference/com/google/android/gms/common/ConnectionResult.html#SUCCESS"
>{@code SUCCESS}</a>,
        then the Google Play services APK is up-to-date, and you can proceed as normal.
    </li>
    <li>
        If the result code is
<a href="{@docRoot}reference/com/google/android/gms/common/ConnectionResult.html#SERVICE_MISSING"
>{@code SERVICE_MISSING}</a>,
<a href="{@docRoot}reference/com/google/android/gms/common/ConnectionResult.html#SERVICE_VERSION_UPDATE_REQUIRED"
>{@code SERVICE_VERSION_UPDATE_REQUIRED}</a>,
        or
<a href="{@docRoot}reference/com/google/android/gms/common/ConnectionResult.html#SERVICE_DISABLED"
>{@code SERVICE_DISABLED}</a>, then
  call <a href="{@docRoot}reference/com/google/android/gms/common/GooglePlayServicesUtil.html#getErrorDialog(int, android.app.Activity, int)"
  >{@code getErrorDialog()}</a>
  to display an error message to the user, which allows the user to download the APK
  from the Google Play Store or enable it in the device's system settings.
    </li>
</ol>