versions/nougat/android-7.0-changes.jd

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page.keywords=preview,sdk,compatibility
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page.tags="preview", "developer preview"
page.image=images/cards/card-n-changes_2x.png
@jd:body


<div id="tb-wrapper">
<div id="tb">

<h2> </h2>

<ol>
  <li><a href="#perf"> </a>
    <ol>
      <li><a href="#doze"> Doze</a></li>
      <li><a href="#bg-opt">  </a></li>
    </ol>
  </li>
  <li><a href="#perm"> </a></li>
  <li><a href="#accessibility">  </a>
    <ol>
      <li><a href="#screen-zoom"> </a></li>
      <li><a href="#vision-settings">Vision Settings   </a></li>
    </ol>
  </li>
  <li><a href="#ndk">  NDK   </a></li>
  <li><a href="#afw">Android for Work</a></li>
</ol>

<h2></h2>
<ol>
  <li><a href="{@docRoot}preview/api-overview.html"> API- AndroidN</a>
</li>
</ol>

</div>
</div>


<p>
         AndroidN
   API.
,        .

</p>

<p>
        Android,    ,
            .
</p>


<h2 id="perf"> </h2>

<p>
      AndroidN
  ,      .
         .
     ,          .

</p>

<h3 id="doze"> Doze</h3>

<p>
    Android6.0 ( API23),  Doze   ,
    ,      ,
 ,    . AndroidN
 Doze,
  ,      ,   ,    ,
,      .
</p>


<img src="{@docRoot}images/android-7.0/doze-diagram-1.png" alt="" height="251px" id="figure1" />
<p class="img-caption">
  <strong>.1.</strong>          Doze
   .
</p>

<p>
               ,
    Doze      :
 ,     .
          Doze,
  Doze  {@link android.os.PowerManager.WakeLock},
 {@link android.app.AlarmManager},  GPS  Wi-Fi.   ,
      Doze,       ,

     .
</p>


<img src="{@docRoot}images/android-7.0/doze-diagram-2.png" alt="" id="figure2" />
<p class="img-caption">
  <strong>.2.</strong>          Doze
 ,       .
</p>

<p>
   ,
     Doze
   .

  Doze  Android6.0 ( API23),
<a href="{@docRoot}training/monitoring-device-state/doze-standby.html">   Doze     </a>.
     (,  Google Cloud Messaging (GCM)
    )
Doze.
</p>


<h3 id="bg-opt"> Svelte:   </h3>

<p>
   AndroidN
   .     ,
    ,
 .
   .
</p>

<p>
         , ,
 Wi-Fi   .
,         {@link
  android.net.ConnectivityManager#CONNECTIVITY_ACTION}   .
       ,
         .

</p>

<p>
            {@link
  android.hardware.Camera#ACTION_NEW_PICTURE}  {@link
  android.hardware.Camera#ACTION_NEW_VIDEO}   ,   .
       ,
   .
</p>

<p>
      AndroidN
 .
</p>

<ul>
  <li>  AndroidN     {@link
  android.net.ConnectivityManager#CONNECTIVITY_ACTION},
      .
    {@code CONNECTIVITY_CHANGE}
 ,      {@link
  android.content.BroadcastReceiver}.
  </li>

  <li>        {@link
  android.hardware.Camera#ACTION_NEW_PICTURE}  {@link
  android.hardware.Camera#ACTION_NEW_VIDEO}.      ,  ,     AndroidN.

  </li>
</ul>

<p>
     Android       ,
      .
(  )
  .
</p>

<p>
   Android   ,
     . ,  API {@link
  android.app.job.JobScheduler}      ,
     ,      .     {@link
  android.app.job.JobScheduler},      .

</p>

<p>

     <a href="{@docRoot}preview/features/background-optimization.html">  </a>.

</p>


<h2 id="perm"> </h2>

<p>
   AndroidN   ,      ,

  .     ,
 .
</p>

<ul>
  <li>{@code GET_ACCOUNTS} ()
    <p>
       GET_ACCOUNTS   .
 ,   AndroidN.
    </p>
  </li>

</ul>


<h2 id="accessibility">  </h2>

<p>
   AndroidN  ,
    .
     ,
    ,
.
</p>


<h3 id="screen-zoom"> </h3>

<p>
  AndroidN     <strong>Display size</strong>,
   ,
    .
<a href="http://developer.android.com/guide/topics/resources/providing-resources.html">  sw320dp</a> (  Nexus4,    ).

</p>

<div class="cols">

<div class="col-6">
  <img src="{@docRoot}images/android-7.0/screen-zoom-1.png" alt="" height="XXX" id="figure1" />
</div>
<div class="col-6">
  <img src="{@docRoot}images/android-7.0/screen-zoom-2.png" alt="" height="XXX" id="figure1" />
</div>

</div> <!-- end cols -->
<p class="img-caption">
  <strong>.3.</strong>
  Display size     AndroidN.
</p>


<p>
            .

</p>

<ul>
  <li>    API  23  ,
   .  ,
  <em>Settings</em>
<strong>Display size</strong>,        ,
    .     ,    ,

<a href="{@docRoot}guide/topics/resources/runtime-changes.html">
  </a>,      .
  </li>

  <li>    AndroidN,
(  )    ,
<a href="{@docRoot}guide/topics/resources/runtime-changes.html">    </a>.

  </li>
</ul>

<p>
      -       ,
        Android.    .
</p>

<ul>
  <li>        <code><a href=
  "{@docRoot}guide/topics/resources/providing-resources.html">sw320dp</a></code>
     .
  </li>

  <li>        ,    ,
      ,   .
  ,       .

    <p class="note">
      <strong>.</strong>    ,   ,
    , , ,
     .    ,
       .

    </p>
  </li>

  <li>     ,         .
     <a href="{@docRoot}guide/practices/screens_support.html">   </a> (<code>dp</code>).

  </li>
</ul>

<h3 id="vision-settings">Vision Settings   </h3>

<p>
   AndroidN   Vision Settings   ,
      :
<strong>Magnification gesture</strong>, <strong>Font size</strong>,
<strong>Display size</strong>  <strong>TalkBack</strong>.
   ,     .
   ,    ,
  <strong>Settings&gt;
Accessibility</strong>.
</p>

<h2 id="ndk">  NDK   </h2>

<p>
   AndroidN    ,    API-.
   NDK,       API-  Android.
  API     Android
       .
</p>

<p>
        API, ,     AndroidN,
       (logcat)    API.
         ,   .
    ,
 API
   .
</p>

<p>
        ,    NDK
      API   .
     ,   ,
     ,     (,
<code>libpng</code>),      NDK.    ,
 APK    .so,     .
</p>

<p class="caution">
  <strong>!</strong>
API. ,   ,
  Android.
</p>

<p>
         (  ),
NDK,           Android.
       OpenSSL  BoringSSL.
       ,
  ,
NDK,    .          NDK    ,
    Android API.
</p>

<p>
              Java  NDK,
         AndroidN.
</p>

<p>  Java:</p>
<pre class="no-pretty-print">
java.lang.UnsatisfiedLinkError: dlopen failed: library "/system/lib/libcutils.so"
    is not accessible for the namespace "classloader-namespace"
</pre>

<p>  NDK:</p>
<pre class="no-pretty-print">
dlopen failed: cannot locate symbol "__system_property_get" referenced by ...
</pre>


<p>
           .
</p>

<ul>
  <li> getJavaVM  getJNIEnv  libandroid_runtime.so
  JNI:
<pre class="no-pretty-print">
AndroidRuntime::getJavaVM -&gt; GetJavaVM from &lt;jni.h&gt;
AndroidRuntime::getJNIEnv -&gt; JavaVM::GetEnv or
JavaVM::AttachCurrentThread from &lt;jni.h&gt;.
</pre>
  </li>

  <li>  {@code property_get}  {@code libcutils.so}
   {@code __system_property_get}.
   {@code __system_property_get}    include:
<pre>
#include &lt;sys/system_properties.h&gt;
</pre>
  </li>

  <li>  {@code SSL_ctrl}  {@code libcrypto.so}     .
,
{@code libcyrpto.a}    {@code .so}
{@code libcrypto.so}  BoringSSL  OpenSSL.
  </li>
</ul>

<h2 id="afw">Android for Work</h2>
<p>
  AndroidN    ,   Android for Work,    ,
 ,   ,
    .
Android for Work,
  .
</p>

<ul>
  <li>     ,   DPC   .
      ,   NSDK,
   ,
(DPC)
<code>DevicePolicyManager.setCertInstallerPackage()</code>.

<code>IllegalArgumentException</code>.
  </li>

  <li>
.
<code>DevicePolicyManager.resetPassword()</code>
 .  -   ,   ,
, PIN-   .
  </li>

  <li>           .
   API-
     <code>DISALLOW_MODIFY_ACCOUNTS</code>.
  </li>

  <li>      .
    ,    <code>DISALLOW_ADD_USER</code>.
     .
 ,    <code>CreateUser()</code>
<code>createAndInitial()</code>,
<code>DevicePolicyManager.createAndManageUser()</code>.
  </li>

  <li>      .     MAC-
Wi-Fi  ,
<code>DevicePolicyManagewr.getWifiMacAddress()</code>.   Wi-Fi
 ,     {@code null}.
  </li>
</ul>

<p>
      Android for Work  AndroidN
<a href="{@docRoot}preview/features/afw.html"> Android for Work</a>.
</p>

<h2 id="other">  </h2>

<ul>
<li> ,   AndroidN,    API   ,
,     .
    .       ,
     .

<p>
      ,
      .
     ,
     DDMS.
</p>

<p>
  N    Android       ,
       .
</p>
</li>

<li>
  AndroidN
        .     ,
   (<strong>Setting</strong>&gt;
<strong>Display</strong>&gt; <strong>Font size</strong>)
   .
</li>
</ul>