page.title=Android 5.1 APIs
excludeFromSuggestions=true
sdk.platform.version=5.1
sdk.platform.apiLevel=22
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<h2>In this document
    <a href="#" onclick="hideNestedItems('#toc44',this);return false;" class="header-toggle">
        <span class="more">show more</span>
        <span class="less" style="display:none">show less</span></a></h2>

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  <li><a href="#ApiLevel">Update your target API level</a></li>

  <li><a href="#multisim">Multiple SIM Card Support</a></li>
  <li><a href="#http">Deprecated HTTP Classes</a></li>
  <li><a href="#carrier">Carrier Services</a></li>
</ol>

<h2>API Differences</h2>
<ol>
<li><a href="{@docRoot}sdk/api_diff/22/changes.html">API level 21 to 22 &raquo;</a> </li>
</ol>

<h2>See Also</h2>
<ol>
<li><a href="{@docRoot}about/versions/lollipop.html">Android Lollipop Highlights</a> </li>
</ol>


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<p>API Level: {@sdkPlatformApiLevel}</p>

<p>
  Android 5.1
  (<a href="{@docRoot}reference/android/os/Build.VERSION_CODES.html#LOLLIPOP_MR1">LOLLIPOP_MR1</a>)
  is an update to the Lollipop release that offers new features for users and app developers.
  This document provides an introduction to the most notable new APIs.
</p>

<p>
  For a high-level look at the new platform features, see the <a href=
  "{@docRoot}about/versions/lollipop.html">Android Lollipop highlights</a>.
</p>


<h3 id="ApiLevel">Update your target API level</h3>

<p>
  To start building apps for Android 5.1, use the
  <a href="{@docRoot}tools/help/sdk-manager.html">SDK Manager</a> to download the Android 5.1 SDK
  Platform and System Images. Then set your app development project to use a
  <a href="{@docRoot}guide/topics/manifest/uses-sdk-element.html#target">{@code targetSdkVersion}</a>
  of <code>"{@sdkPlatformApiLevel}"</code>. Install your app on an Android {@sdkPlatformVersion}
  system image, test it, then publish the updated app with this change.
</p>

<p>
  You can use Android {@sdkPlatformVersion} APIs while also supporting older versions by adding
  conditions to your code that check for the system API level before executing APIs not supported
  by your <a href="{@docRoot}guide/topics/manifest/uses-sdk-element.html#min">{@code
  minSdkVersion}</a>. To learn more about maintaining backward compatibility, read <a href=
  "{@docRoot}training/basics/supporting-devices/platforms.html">Supporting Different Platform
  Versions</a>.
</p>

<p>
  For more information about how API levels work, read <a href=
  "{@docRoot}guide/topics/manifest/uses-sdk-element.html#ApiLevels">What is API Level?</a>
</p>

<h2 id="multisim">Multiple SIM Card Support</h2>

<p>
  Android 5.1 adds support for using more than one cellular carrier SIM card at a time. This
  feature lets users activate and use additional SIMs on devices that have two or more SIM card
  slots.
</p>

<p>
  You can access information about the currently active SIM through the {@link
  android.telephony.SubscriptionManager} class, including whether or not the device is considered
  to be roaming on the current network. This information is useful for developers who want to
  throttle their apps' data access down or off for device users who are sensitive to data access
  charges. Your app can be alerted to changes in a device's current network connection by
  requesting the {@link android.Manifest.permission#READ_PHONE_STATE} permission and setting {@link
  android.telephony.SubscriptionManager.OnSubscriptionsChangedListener} on the {@link
  android.telephony.SubscriptionManager} object.
</p>


<h2 id="http">Deprecated HTTP Classes</h2>

<p>
  The {@code org.apache.http} classes and the {@code android.net.http.AndroidHttpClient} class
  have been deprecated in Android 5.1. These classes are no longer being maintained and you should
  migrate any app code using these APIs to the {@link java.net.URLConnection} classes as soon as
  possible.
</p>


<h2 id="carrier">Carrier Services</h2>

<p>
  Android 5.1 provides support for telecommunication service providers to create apps that can
  perform carrier provisioning tasks on an Android device. These APIs provide a secure and flexible
  way for carrier-developed apps to perform these tasks and be distributed through Google Play. Apps
  that use these functions must be signed by a certificate that matches the certificate in the
  device's Universal Integrated Circuit Card (UICC).
</p>

<p>
  The carrier service APIs have been added to the {@link android.telephony.TelephonyManager} class,
  the {@link android.telephony.SmsManager} class, and the new {@link
  android.service.carrier.CarrierMessagingService} class. Apps can check for access to these APIs
  by calling the {@link android.telephony.TelephonyManager#hasCarrierPrivileges} method. Apps that
  call these APIs without access receive a {@link java.lang.SecurityException}.
</p>