zh-cn/preview/behavior-changes.jd

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@jd:body


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

<h2></h2>

<ol>
  <li><a href="#perf"></a>
    <ol>
      <li><a href="#doze"></a></li>
      <li><a href="#bg-opt"></a></li>
    </ol>
  </li>
  <li><a href="#perm"></a>
  </li>
  <li><a href="#sharing-files"></a></li>
  <li><a href="#accessibility"></a>
    <ol>
      <li><a href="#screen-zoom"></a></li>
      <li><a href="#vision-settings"></a></li>
    </ol>
  </li>
  <li><a href="#ndk">NDK </a></li>
  <li><a href="#afw">Android for Work</a></li>
  <li><a href="#annotations"></a></li>
  <li><a href="#other"></a></li>
</ol>

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

</div>
</div>


<p>
  Android N  API


</p>

<p>
   Android

</p>


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

<p>
Android N  RAM
 Intent


</p>

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

<p>
  Android 6.0API  23 CPU  Android N  CPU


</p>


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

</p>

<p>


 {@link android.os.PowerManager.WakeLock}{@link android.app.AlarmManager} GPS  Wi-Fi


/


</p>


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

</p>

<p>

 Android 6.0API  23<a href="{@docRoot}training/monitoring-device-state/doze-standby.html"></a>


 Google Cloud Messaging (GCM)


</p>


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

<p>
  Android N


</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>
  Android N

</p>

<ul>
  <li> Android N  {@link
  android.net.ConnectivityManager#CONNECTIVITY_ACTION}
{@link android.content.BroadcastReceiver}  {@code CONNECTIVITY_CHANGE}


  </li>

  <li> {@link
android.hardware.Camera#ACTION_NEW_PICTURE}  {@link
android.hardware.Camera#ACTION_NEW_VIDEO}  Android N

  </li>
</ul>

<p> Intent Android N

  Android
{@link
  android.app.job.JobScheduler} API

 {@link
  android.app.job.JobScheduler}
</p>

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


</p>

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

<p>
  Android N
</p>

<h3 id="permfilesys"></h3>

<p>
   Android N (<code>0700</code>)


</p>

<ul>
  <li>
     {@link android.content.Context#MODE_WORLD_READABLE} / {@link android.content.Context#MODE_WORLD_WRITEABLE}  {@link java.lang.SecurityException}


    <p class="note">
      <strong></strong>
       API  {@link java.io.File File} API


    </p>
  </li>
  <li>
     <code>file://</code> URI
 <code>file://</code> URI  <code>FileUriExposedException</code>

 {@link
    android.support.v4.content.FileProvider}

  </li>
  <li>
    {@link android.app.DownloadManager}
 {@link
    android.app.DownloadManager#COLUMN_LOCAL_FILENAME}
 Android N  {@link android.app.DownloadManager#COLUMN_LOCAL_FILENAME}  {@link java.lang.SecurityException}


     {@link
    android.app.DownloadManager.Request#setDestinationInExternalFilesDir
    DownloadManager.Request.setDestinationInExternalFilesDir()}  {@link
    android.app.DownloadManager.Request#setDestinationInExternalPublicDir
    DownloadManager.Request.setDestinationInExternalPublicDir()}  {@link android.app.DownloadManager#COLUMN_LOCAL_FILENAME}


 {@link android.app.DownloadManager}  {@link android.content.ContentResolver#openFileDescriptor
    ContentResolver.openFileDescriptor()}


  </li>
</ul>

<h2 id="sharing-files"></h2>

<p>
 Android N Android  {@link android.os.StrictMode} API  {@code file://} URI

 URI  Intent  {@code FileUriExposedException}

</p>

<p>
 {@code content://} URI URI
 {@link android.support.v4.content.FileProvider}
<a href="{@docRoot}training/secure-file-sharing/index.html"></a>


</p>

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

<p>
  Android N


</p>


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

<p>
  Android N <strong></strong><a href="http://developer.android.com/guide/topics/resources/providing-resources.html">
 sw320dp</a> Nexus 4


</p>

<div class="cols">

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

</div> <!-- end cols -->
<p class="img-caption">
  <strong> 3.</strong>  Android N

</p>


<p>


</p>

<ul>
  <li> API  23
Settings <strong>Display size</strong>

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


  </li>

  <li> Android N <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"></h3>

<p>
  Android N WelcomeVision 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>
  Android N  API
   NDK Android  API
 Android  API

</p>

<p>
   API Android N  API


 API


</p>

<p>
   NDK  API  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>
   Android N  Java  NDK

</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> JNI  libandroid_runtime.so  getJavaVM  getJNIEnv

<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 alternative __system_property_get}  {@code libcutils.so}  {@code property_get}  {@code __system_property_get}  include


<pre>
#include &lt;sys/system_properties.h&gt;
</pre>
  </li>

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


  </li>
</ul>

<h2 id="afw">Android for Work</h2>
<p>
  Android N  Android for Work  Android for Work


</p>

<ul>
  <li> DPC
 N SDK  (DPC)  <code>DevicePolicyManager.setCertInstallerPackage()</code>


 <code>IllegalArgumentException</code>


  </li>

  <li>
 {@code DevicePolicyManager.resetPassword()}

PIN

  </li>

  <li> <code>DISALLOW_MODIFY_ACCOUNTS</code>  Account Management API


  </li>

  <li> <code>DISALLOW_ADD_USER</code>


<code>CreateUser()</code>  <code>createAndInitializeUser()</code>  <code>DevicePolicyManager.createAndManageUser()</code>


  </li>

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

  </li>

  <li>


</ul>

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

<h2 id="annotations"></h2>

<p>
Android N


</p>

<ul>
   <li>{@code VISIBILITY_BUILD}:</li>
   <li>{@code VISIBILITY_SYSTEM}:
</li>
</ul>

<p>

 {@code @Retention(RetentionPolicy.RUNTIME)}
</p>

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

<ul>
<li> Android N  API


<p>
 DDMS


</p>

<p>
 N

</p>
</li>

<li>
Android N  (<strong>Setting</strong> &gt;
<strong>Display</strong> &gt; <strong>Font size</strong>)


</li>

<li>
 Android  TCP
Android N  {@code android.os.NetworkOnMainThreadException} ANR


</li>

<li>
{@code Debug.startMethodTracing()}  SD


 {@code WRITE_EXTERNAL_STORAGE}  API
</li>

<li>
 API  {@link android.os.Binder}  {@code TransactionTooLargeExceptions}  {@code RuntimeExceptions}


 {@link android.app.Activity#onSaveInstanceState Activity.onSaveInstanceState()}  {@code ActivityThread.StopInfo}  Android N  {@code RuntimeException}


</li>

<li>
 {@link android.view.View}  {@link java.lang.Runnable}  {@link android.view.View}  {@link android.view.View}  {@link java.lang.Runnable}  {@link android.view.View} {@link java.lang.Runnable}


<ul>
   <li> UI  {@link android.view.View}{@link java.lang.Runnable}

   </li>
   <li> {@link java.lang.Runnable}  {@link java.lang.Runnable}
</li>
</ul>
</li>

<li>
 Android N  {@link android.Manifest.permission#DELETE_PACKAGES DELETE_PACKAGES}


 {@link android.content.pm.PackageInstaller#uninstall PackageInstaller.uninstall()}  {@link android.content.pm.PackageInstaller#STATUS_PENDING_USER_ACTION STATUS_PENDING_USER_ACTION}


</li>

</ul>