docs/html/work/managed-configurations.jd

page.title=Set up Managed Configurations
page.metaDescription=Learn how to implement managed configurations that can be changed by other apps on the same device.
page.image=images/work/cards/briefcase_600px.png

@jd:body

<div id="qv-wrapper">
  <div id="qv">
    <h2>In this document</h2>
    <ol>
      <li><a href="#define-configuration">Define Managed Configurations</a></li>
      <li><a href="#check-configuration">Check Managed Configurations</a></li>
      <li><a href="#listen-configuration">Listen for Managed Configuration Changes</a></li>
    </ol>
  </div>
</div>

<p>
  If you are developing apps for the enterprise market, you may need
  to satisfy particular requirements set by a company's policies.
  Managed configurations, previously known as <em>application restrictions</em>,
  allow the enterprise administrator to remotely specify settings for
  apps. This capability is particularly useful for enterprise-approved
  apps deployed to a managed profile.
</p>

<p>For example, an enterprise might require that approved apps allow the
enterprise administrator to:</p>

<ul>
  <li>Whitelist or blacklist URLs for a web browser</li>
  <li>Configure whether an app is allowed to sync content via cellular, or just
    by Wi-Fi</li>
  <li>Configure the app's email settings</li>
</ul>

<p>
  This guide shows how to implement managed configuration settings in
  your app. If you're an EMM developer, refer to the
  <a href="https://developers.google.com/android/work/build-dpc"
  >Build a Device Policy Controller</a> guide.
</p>

<p class="note">
  <strong>Note:</strong> For historical reasons, these configuration settings are known as
  <em>restrictions,</em> and are implemented with files and classes that use this
  term (such as {@link android.content.RestrictionsManager}). However, these
  restrictions can actually implement a wide range of configuration options,
  not just restrictions on app functionality.
</p>

<h2 id="overview">
  Remote Configuration Overview
</h2>

<p>
  Apps define the managed configuration options that can be remotely
  set by an administrator. These are arbitrary settings that can be
  changed by a managed configuration provider. If your app is running on an
  enterprise device's managed profile, the enterprise administrator
  can change your app's managed configuration.
</p>

<p>
  The managed configurations provider is another app running on the same device.
  This app is typically controlled by the enterprise administrator. The
  enterprise administrator communicates configuration changes to the managed
  configuration provider app. That app, in turn, changes the configurations on your app.
</p>

<p>
  To provide externally managed configurations:
</p>

<ul>
  <li>Declare the managed configurations in your app manifest. Doing
    so allows the enterprise administrator to read the app's
    configurations through Google Play APIs.
  </li>

  <li>Whenever the app resumes, use the {@link
    android.content.RestrictionsManager} object to check the current
    managed configurations, and change your app's UI and behavior to
    conform with those configurations.
  </li>

  <li>Listen for the
    {@link android.content.Intent#ACTION_APPLICATION_RESTRICTIONS_CHANGED
    ACTION_APPLICATION_RESTRICTIONS_CHANGED} intent. When you receive this
    broadcast, check the {@link android.content.RestrictionsManager} to see what
    the current managed configurations are, and make any necessary changes to your
    app's behavior.
  </li>
</ul>

<h2 id="define-configuration">
  Define Managed Configurations
</h2>

<p>
  Your app can support any managed configuration you want to define. You declare the
  app's managed configurations in a <em>managed configurations file</em>, and declare
  the configurations file in the manifest. Creating a configurations file allows
  other apps to examine the managed configurations your app provides. Enterprise
  Mobility Management (EMM) partners can read your app's configurations by using
  Google Play APIs.
</p>

<p>
  To define your app's remote configuration options, put the following element
  in your manifest's
  <a href="{@docRoot}guide/topics/manifest/application-element.html">
  <code>&lt;application&gt;</code></a> element:
</p>

<pre>&lt;meta-data android:name="android.content.APP_RESTRICTIONS"
    android:resource="@xml/app_restrictions" /&gt;
</pre>

<p>
  Create a file named <code>app_restrictions.xml</code> in your app's
  <code>res/xml</code> directory. The structure of that file is described in
  the reference for {@link android.content.RestrictionsManager}. The file has a
  single top-level <code>&lt;restrictions&gt;</code> element, which contains
  one <code>&lt;restriction&gt;</code> child element for every configuration
  option the app has.
</p>

<p class="note">
  <strong>Note:</strong> Do not create localized versions of the
  managed configuration file. Your app is only allowed to have a
  single managed configurations file, so configurations will be
  consistent for your app in all locales.
</p>

<p>
  In an enterprise environment, an EMM will typically use the managed
  configuration schema to generate a remote console for IT
  administrators, so the administrators can remotely configure your
  application.
</p>

<p>
  The managed configuration provider can query the app to find details
  on the app's available configurations, including their description
  text. The configurations provider and enterprise administrator can
  change your app's managed configurations at any time, even when the
  app is not running.
</p>

<p>
  For example, suppose your app can be remotely configured to allow or forbid
  it to download data over a cellular connection. Your app could have a
  <code>&lt;restriction&gt;</code> element like this:
</p>

<pre>
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;restrictions xmlns:android="http://schemas.android.com/apk/res/android"&gt;

  &lt;restriction
    android:key="downloadOnCellular"
    android:title="@string/download_on_cell_title"
    android:restrictionType="bool"
    android:description="@string/download_on_cell_description"
    android:defaultValue="true" /&gt;

&lt;/restrictions&gt;
</pre>

<p>
  You use each configuration's <code>android:key</code> attribute to
  read its value from a managed configuration bundle. For this reason,
  each configuration must have a unique key string, and the string
  <em>cannot</em> be localized. It must be specified with a string literal.
</p>

<p class="note">
  <strong>Note:</strong> In a production app, <code>android:title</code> and
  <code>android:description</code> should be drawn from a localized resource
  file, as described in
  <a href="{@docRoot}guide/topics/resources/localization.html"
  >Localizing with Resources</a>.
</p>

<p id="nested-restrictions">
  An app can define one or multiple nested restriction elements using
  the restriction types
  {@link android.content.RestrictionEntry#TYPE_BUNDLE bundle} and
  {@link android.content.RestrictionEntry#TYPE_BUNDLE_ARRAY bundle_array}.
  For example, an app with multiple VPN connection options could define
  each VPN server configuration in a bundle, with multiple bundles grouped
  together in a bundle array:
</p>

<pre>
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;restrictions xmlns:android="http://schemas.android.com/apk/res/android" &gt;

  &lt;restriction
    android:key="vpn_configuration_list"
    android:restrictionType="bundle_array"&gt;
    &lt;restriction
      android:key="vpn_configuration"
      android:restrictionType="bundle"&gt;
      &lt;restriction
        android:key="vpn_server"
        android:restrictionType="string"/&gt;
      &lt;restriction
        android:key="vpn_username"
        android:restrictionType="string"/&gt;
      &lt;restriction
        android:key="vpn_password"
        android:restrictionType="string"/&gt;
    &lt;/restriction&gt;
  &lt;/restriction&gt;

&lt;/restrictions&gt;
</pre>

<p>
  The supported types for the <code>android:restrictionType</code> element
  are listed in <a href="#restriction-types">Table 1</a> and documented in
  the reference for {@link android.content.RestrictionsManager} and
  {@link android.content.RestrictionEntry}.
</p>

<p class="table-caption" id="restriction-types">
  <strong>Table 1.</strong> Restriction entry types and usage.
</p>
<table>
  <tbody>
    <tr>
      <th>Type</th>
      <th>android:restrictionType</th>
      <th>Typical usage</th>
    </tr>
    <tr>
      <td>
        {@link android.content.RestrictionEntry#TYPE_BOOLEAN TYPE_BOOLEAN}
      </td>
      <td><code>"bool"</code></td>
      <td>
        A boolean value, true or false.
      </td>
    </tr>
    <tr>
      <td>
        {@link android.content.RestrictionEntry#TYPE_STRING TYPE_STRING}
      </td>
      <td><code>"string"</code></td>
      <td>
        A string value, such as a name.
      </td>
    </tr>
    <tr>
      <td>
        {@link android.content.RestrictionEntry#TYPE_INTEGER TYPE_INTEGER}
      </td>
      <td><code>"integer"</code></td>
      <td>
        An integer with a value from
        {@link java.lang.Integer#MIN_VALUE MIN_VALUE} to
        {@link java.lang.Integer#MAX_VALUE MAX_VALUE}.
      </td>
    </tr>
    <tr>
      <td>
        {@link android.content.RestrictionEntry#TYPE_CHOICE TYPE_CHOICE}
      </td>
      <td><code>"choice"</code></td>
      <td>
        A string value, typically presented as a single-select list.
      </td>
    </tr>
    <tr>
      <td>
        {@link android.content.RestrictionEntry#TYPE_MULTI_SELECT TYPE_MULTI_SELECT}
      </td>
      <td><code>"multi-select"</code></td>
      <td>
        Use this for presenting a multi-select list where more than
        one entry can be selected, such as for choosing specific
        titles to white-list.
      </td>
    </tr>
    <tr>
      <td>
        {@link android.content.RestrictionEntry#TYPE_NULL TYPE_NULL}
      </td>
      <td><code>"hidden"</code></td>
      <td>
        Hidden restriction type. Use this type for information that
        needs to be transferred across but shouldn't be presented to
        the user in the UI. Stores a single string value.
      </td>
    </tr>
    <tr>
      <td>{@link android.content.RestrictionEntry#TYPE_BUNDLE TYPE_BUNDLE}</td>
      <td><code>"bundle"</code></td>
      <td>
        Use this for storing {@link android.os.Bundle bundles} of
        restrictions. Available in Android 6.0 (API level 23).
      </td>
    </tr>
    <tr>
      <td>
        {@link android.content.RestrictionEntry#TYPE_BUNDLE_ARRAY TYPE_BUNDLE_ARRAY}
      </td>
      <td><code>"bundle_array"</code></td>
      <td>
        Use this for storing arrays of restriction
        <a href="{@docRoot}reference/android/os/Bundle.html"
        >bundles</a>. Available in Android 6.0 (API level 23).
      </td>
    </tr>
  </tbody>
</table>

<h2 id="check-configuration">
  Check Managed Configurations
</h2>

<p>
  Your app is not automatically notified when other apps change its
  configuration settings. Instead, you need to check what the managed
  configurations are when your app starts or resumes, and listen for a
  system intent to find out if the configurations change while your
  app is running.
</p>

<p>
  To find out the current configuration settings, your app uses a
  {@link android.content.RestrictionsManager} object. Your app should
  check for the current managed configurations at the following times:
</p>

<ul>
  <li>When the app starts or resumes, in its
  {@link android.app.Activity#onResume onResume()} method
  </li>

  <li>When the app is notified of a configuration change, as described in
    <a href="#listen-configuration">Listen for Managed Configuration
    Changes</a>
  </li>
</ul>

<p>
  To get a {@link android.content.RestrictionsManager} object, get the current
  activity with {@link android.app.Fragment#getActivity getActivity()}, then
  call that activity's {@link android.app.Activity#getSystemService(java.lang.String)
  Activity.getSystemService()} method:
</p>

<pre>RestrictionsManager myRestrictionsMgr =
    (RestrictionsManager) getActivity()
        .getSystemService(Context.RESTRICTIONS_SERVICE);</pre>

<p>
  Once you have a {@link android.content.RestrictionsManager}, you can get the
  current configuration settings by calling its
  {@link android.content.RestrictionsManager#getApplicationRestrictions
  getApplicationRestrictions()} method:
</p>

<pre>Bundle appRestrictions = myRestrictionsMgr.getApplicationRestrictions();</pre>

<p class="note">
  <strong>Note:</strong> For convenience, you can also fetch the current
  configurations with a {@link android.os.UserManager}, by calling
  {@link android.os.UserManager#getApplicationRestrictions
  UserManager.getApplicationRestrictions()}. This method behaves exactly the
  same as {@link android.content.RestrictionsManager#getApplicationRestrictions
  RestrictionsManager.getApplicationRestrictions()}.
</p>

<p>
  The {@link android.content.RestrictionsManager#getApplicationRestrictions
  getApplicationRestrictions()} method requires reading from data storage, so
  it should be done sparingly. Do not call this method every time you need to
  know the current configuration. Instead, you should call it once when your app
  starts or resumes, and cache the fetched managed configurations bundle. Then listen
  for the {@link android.content.Intent#ACTION_APPLICATION_RESTRICTIONS_CHANGED
  ACTION_APPLICATION_RESTRICTIONS_CHANGED} intent to find out if the configuration
  change while your app is active, as described in
  <a href="#listen-configuration">Listen for Managed Configuration Changes</a>.
</p>

<h3 id="read-configurations">
  Reading and applying managed configurations
</h3>

<p>
  The {@link android.content.RestrictionsManager#getApplicationRestrictions
  getApplicationRestrictions()} method returns a {@link android.os.Bundle}
  containing a key-value pair for each configuration that has been set. The
  values are all of type <code>Boolean</code>, <code>int</code>,
  <code>String</code>, and <code>String[]</code>. Once you have the
  managed configurations {@link android.os.Bundle}, you can check the current
  configuration settings with the standard {@link android.os.Bundle} methods for
  those data types, such as {@link android.os.BaseBundle#getBoolean getBoolean()}
  or
  {@link android.os.BaseBundle#getString getString()}.
</p>

<p class="note">
  <strong>Note:</strong> The managed configurations {@link android.os.Bundle}
  contains one item for every configuration that has been explicitly set by a
  managed configurations provider. However, you <em>cannot</em> assume that a
  configuration will be present in the bundle just because you defined a default
  value in the managed configurations XML file.
</p>

<p>
  It is up to your app to take appropriate action based on the current
  managed configuration settings. For example, if your app has a
  configuration specifying whether it can download data over a
  cellular connection, and you find that the configuration is set to
  <code>false</code>, you would have to disable data download except when
  the device has a Wi-Fi connection, as shown in the following example code:
</p>

<pre>
boolean appCanUseCellular;

if (appRestrictions.containsKey("downloadOnCellular")) {
    appCanUseCellular = appRestrictions.getBoolean("downloadOnCellular");
} else {
    // cellularDefault is a boolean using the restriction's default value
    appCanUseCellular = cellularDefault;
}

if (!appCanUseCellular) {
    // ...turn off app's cellular-download functionality
    // ...show appropriate notices to user
}</pre>

<p>
  To apply multiple <a href="#nested-restrictions">nested restrictions</a>, read
  the {@link android.content.RestrictionEntry#TYPE_BUNDLE_ARRAY bundle_array}
  restriction entry as a collection of {@link android.os.Parcelable} objects
  and cast as a {@link android.os.Bundle}. In this example, each VPN's configuration
  data is parsed and used to build a list of server connection choices:
</p>

<pre>
// VpnConfig is a sample class used store config data, not defined
List&lt;VpnConfig&gt; vpnConfigs = new ArrayList&lt;&gt;();

Parcelable[] parcelables =
    appRestrictions.getParcelableArray("vpn_configuration_list");

if (parcelables != null && parcelables.length > 0) {
    // iterate parcelables and cast as bundle
    for (int i = 0; i < parcelables.length; i++) {
        Bundle vpnConfigBundle = (Bundle) parcelables[i];
        // parse bundle data and store in VpnConfig array
        vpnConfigs.add(new VpnConfig()
            .setServer(vpnConfigBundle.getString("vpn_server"))
            .setUsername(vpnConfigBundle.getString("vpn_username"))
            .setPassword(vpnConfigBundle.getString("vpn_password")));
    }
}

if (!vpnConfigs.isEmpty()) {
    // ...choose a VPN configuration or prompt user to select from list
}</pre>

<h2 id="listen-configuration">
  Listen for Managed Configuration Changes
</h2>

<p>
  Whenever an app's managed configurations are changed, the system fires the
  {@link android.content.Intent#ACTION_APPLICATION_RESTRICTIONS_CHANGED
  ACTION_APPLICATION_RESTRICTIONS_CHANGED} intent. Your app has to listen for
  this intent so you can change the app's behavior when the configuration settings
  change.</p>

<p class="note">
  <strong>Note:</strong> The {@link
  android.content.Intent#ACTION_APPLICATION_RESTRICTIONS_CHANGED
  ACTION_APPLICATION_RESTRICTIONS_CHANGED} intent is sent only to listeners
  that are dynamically registered, <em>not</em> to listeners that are declared
  in the app manifest.
</p>
<p>
  The following code shows how to dynamically register a broadcast receiver for
  this intent:
</p>

<pre>IntentFilter restrictionsFilter =
    new IntentFilter(Intent.ACTION_APPLICATION_RESTRICTIONS_CHANGED);

BroadcastReceiver restrictionsReceiver = new BroadcastReceiver() {
  &#64;Override public void onReceive(Context context, Intent intent) {

    // Get the current configuration bundle
    Bundle appRestrictions = myRestrictionsMgr.getApplicationRestrictions();

    // Check current configuration settings, change your app's UI and
    // functionality as necessary.
  }
};

registerReceiver(restrictionsReceiver, restrictionsFilter);
</pre>
<p class="note">
  <strong>Note:</strong> Ordinarily, your app does not need to be notified
  about configuration changes when it is paused. Instead, you should unregister
  your broadcast receiver when the app is paused. When the app resumes, you
  first check for the current managed configurations (as discussed in
  <a href="#check-configuration">Check Managed Configurations</a>), then register
  your broadcast receiver to make sure you're notified about configuration changes
  that happen while the app is active.
</p>