xref: /frameworks/base/docs/html-intl/intl/zh-cn/about/versions/nougat/android-7.0.jd

page.title=Android N for Developers
meta.tags="preview", "androidn"
page.tags="preview", "developer preview"
page.image=images/cards/card-n-apis_2x.png
@jd:body




<div id="tb-wrapper">
<div id="tb">
  <h2></h2>
  <ol>
      <ul style="list-style-type:none;">
        <li><a href="#multi-window_support"></a></li>
        <li><a href="#notification_enhancements"></a></li>
        <li><a href="#jit_aot">JIT/AOT </a></li>
        <li><a href="#quick_path_to_app_install"></a></li>
        <li><a href="#doze_on_the_go"></a></li>
        <li><a href="#background_optimizations"></a></li>
        <li><a href="#data_saver">Data Saver</a></li>
        <li><a href="#vulkan">Vulkan API</a></li>
        <li><a href="#tile_api">Quick Settings Tile API</a></li>
        <li><a href="#number-blocking"></a></li>
        <li><a href="#call_screening"></a></li>
        <li><a href="#multi-locale_languages"></a></li>
        <li><a href="#emoji"></a></li>
        <li><a href="#icu4">Android  ICU4J API</a></li>
        <li><a href="#gles_32">OpenGL ES 3.2 API</a></li>
        <li><a href="#android_tv_recording">Android TV </a></li>
        <li><a href="#android_for_work">Android for Work</a></li>
        <li><a href="#accessibility_enhancements"></a></li>
        <li><a href="#direct_boot"></a></li>
        <li><a href="#key_attestation"></a></li>
        <li><a href="#network_security_config"></a></li>
        <li><a href="#default_trusted_ca"> CA</a></li>
        <li><a href="#apk_signature_v2">APK Signature Scheme v2</a></li>
        <li><a href="#scoped_directory_access"></a></li>
        <li><a href="#keyboard_shortcuts_helper"></a></li>
        <li><a href="#sustained_performance_api"> API</a></li>
        <li><a href="#vr">VR </a></li>
        <li><a href="#print_svc"></a></li>
        <li><a href="#virtual_files"></a></li>
        <li><a href="#framemetrics_api">FrameMetricsListener API</a></li>
      </ol>
</div>
</div>



<p>Android N  N Developer Preview 

 </p>

<p>
  <a href="{@docRoot}preview/behavior-changes.html"></a> <a href="{@docRoot}preview/setup-sdk.html#docs-dl">API </a> API 



</p>

<h2 id="multi-window_support"></h2>


<p> Android N  &mdash; 
 </p>

  <p> </p>
  <ul>
  <li> Android N 


 </li>

<li> Android TV <a href="{@docRoot}preview/features/picture-in-picture.html"></a>

</li>
  </ul>

<div class="col-4of10">
<img src="{@docRoot}images/android-7.0/mw-portrait.png" alt="" style="height:460px;padding-left:1em;" id="img-split-screen" />
<p class="img-caption">
  <strong> 1. </strong>
</p>

  </div>

<p>
&mdash;

 </p>

<p>
 Activity  Activity 


</p>

<p>
  <a href="{@docRoot}preview/features/multi-window.html"></a>

</p>

<h2 id="notification_enhancements"></h2>

<p> Android N 
</p>

<ul>
  <li>
    <strong></strong>


  </li>

  <li>
    <strong></strong> <code>MessageStyle</code> 



  </li>

  <li>
    <strong></strong>
 Dismiss  Archive 
 Android Wear 


  </li>

  <li>
    <strong></strong>Android 


  </li>

  <li>
    <strong></strong> API 


  </li>
</ul>

<div class="col-4of12">
  <img src="{@docRoot}images/android-7.0/notifications-1.png" alt="" style="padding:.5em;max-width:226px">
</div>

<div class="col-4of12">
  <img src="{@docRoot}images/android-7.0/notifications-3.png" alt="" style="padding:.5em;max-width:226px">
</div>

<div class="col-4of12">
  <img src="{@docRoot}images/android-7.0/notifications-2.png" alt="" style="padding:.5em;max-width:226px">
</div>


<p class="img-caption">
  <strong> 2. </strong>
</p>

<p><a href="{@docRoot}preview/features/notification-updates.html"></a>

</p>



<h2 id="jit_aot"> JIT/AOT </h2>

<p> Android N  Just in Time (JIT)  ART  Android 

JIT  Android  Ahead of Time (AOT) 

</p>

<p> Android  AOT/JIT 
Android 


</p>

<p> RAM 

</p>

<p>Android 

</p>

<h2 id="quick_path_to_app_install"></h2>

<p>Android  JIT 
 Android 6.0 

 </p>

<h2 id="doze_on_the_go">...</h2>

<p>Android 6.0  CPU 

 </p>

<p> Android N  CPU 



</p>


<img src="/preview/images/doze-diagram-1.png" alt="" id="figure1" />
<p class="img-caption">
  <strong> 3. </strong>

</p>


<p>
/


</p>

<p> {@link
android.os.PowerManager.WakeLock}{@link android.app.AlarmManager}  GPS/Wi-Fi  CPU 

</p>

<p>

<a href="{@docRoot}training/monitoring-device-state/doze-standby.html#assessing_your_app"></a>
</p>

<h2 id="background_optimizations">Project Svelte</h2>

<p>Project Svelte  Android  RAM
 Android N Project Svelte 
 </p>

<p> &mdash;  RAM


 </p>

<p> Android 5.0 {@link android.app.job.JobScheduler} 


JobScheduler 
 </p>

<p>
   <a href="https://developers.google.com/android/reference/com/google/android/gms/gcm/GcmNetworkManager">
 <code>GCMNetworkManager</code></a>Google Play  Android 


</p>

<p> <code>JobScheduler</code> 
<code>GCMNetworkManager</code> &mdash;  Android N 



</p>

<p> Android N  &mdash;
 {@link android.net.ConnectivityManager#CONNECTIVITY_ACTION}{@link
  android.hardware.Camera#ACTION_NEW_PICTURE}  {@link
  android.hardware.Camera#ACTION_NEW_VIDEO} &mdash; 
 N Developer Preview  <code>JobScheduler</code>  API

 </p>

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

</p>


<h2 id="data_saver">Data Saver</h2>

<div class="col-5of12" style="margin-right:1.5em;">
<img src="{@docRoot}images/android-7.0/datasaver.png" style="border:2px solid #ddd">

<p class="img-caption" style="padding-right:2em;">
  <strong> 4. </strong>  Data Saver
</p>
  </div>

<p>

 </p>

<p>Android N  Data Saver 

Data Saver  Data Saver 

 </p>

<p> <strong>Settings</strong>  Data Saver  &mdash; 



 Data Saver 
</p>

<p>Android N  {@link android.net.ConnectivityManager}<a href="{@docRoot}preview/features/data-saver.html#status"> Data Saver </a><a href="{@docRoot}preview/features/data-saver.html#monitor-changes"></a>


 Data Saver 
</p>


<h2 id="vulkan">Vulkan API</h2>

<p>
  Android N  3D  API <a href="http://www.khronos.org/vulkan" class="external-link">Vulkan</a>  <a href="https://www.khronos.org/opengles/" class="external-link">OpenGL ES</a> Vulkan  3D  Khronos Group 



</p>

<p>
  Vulkan  CPU  GPU 
Vulkan 


</p>

<p>
  Vulkan  Android NDK

</p>

<ul>
  <li>
  </li>

  <li>
  </li>

  <li>SPIR-V 
  </li>

  <li>SPIR-V 
  </li>
</ul>

<p>
  Vulkan  Vulkan  Nexus 5XNexus 6P  Nexus Player
 Vulkan 

</p>

<p>
   <a href="{@docRoot}ndk/guides/graphics/index.html">API </a>
</p>

<h2 id="tile_api">Quick Settings Tile API</h2>


<div style="float:right;max-width:320px">
<img src="{@docRoot}images/android-7.0/quicksettings.png" style="padding-left:1.5em;">

<p class="img-caption" style="padding-left:2em;">
  <strong> 5.</strong> 
</p>


  </div><p>
 Android N 
 </p>

<p>
 &mdash; 

 </p>

<p>Android N  API
</p>

<p>
  


</p>

<p>
  

</p>

<p>
   <a href="{@docRoot}preview/setup-sdk.html#docs-dl">API </a> <code>android.service.quicksettings.Tile</code>

</p>



<h2 id="number-blocking"></h2>

<p>Android N  API


</p>

<p>Android 

</p>

<ul>
  <li> 
  <li>  Backup &amp; Restore

  <li> 
</ul>

<p> Android  VOIP 


</p>

<p>
   <a href="{@docRoot}preview/setup-sdk.html#docs-dl">API </a> <code>android.provider.BlockedNumberContract</code>


</p>

<h2 id="call_screening"></h2>

<p>
  Android N  <code>CallScreeningService</code> {@link android.telecom.Call.Details Call.Details} 



</p>

<ul>
  <li> 
  <li> 
  <li> 
</ul>

<p>
   <a href="{@docRoot}preview/setup-sdk.html#docs-dl">API </a> <code>android.telecom.CallScreeningService</code>


</p>


<h2 id="multi-locale_languages"></h2>


<p>Android N <strong></strong>
 API  &mdash; 



</p>

<p>Android N 
 25 
 100 
</p>

<p> <code>LocaleList.GetDefault()</code> 
Android N 

</p>

<p><a href="{@docRoot}preview/features/multilingual-support.html"></a>
</p>


<h2 id="emoji"></h2>

<p>
  Android N 



</p>

<ul>
  <li>
    <strong></strong>
     {@link android.graphics.Paint#hasGlyph(String)} 

  </li>
  <li>
    <strong></strong>
    

    

    
    <a class="external-link" href="http://www.unicode.org/Public/9.0.0/ucd/StandardizedVariants-9.0.0d1.txt"> Unicode </a> <em></em>



  </li>
  <li>
    <strong></strong>Android N 


 {@link android.graphics.Paint#hasGlyph(String)} 

 <a class="external-link" href="http://unicode.org/emoji/charts/full-emoji-list.html">Unicode </a>


  </li>
</ul>


<h2 id="icu4">Android  ICU4J API</h2>

<p>
  Android N  Android  <code>android.icu</code>  <a href="http://site.icu-project.org/">ICU4J</a> API 
 <code>com.java.icu</code>  <code>android.icu</code>

 ICU4J  Android  <code>android.icu</code> API  APK 


</p>

<p>
   Android ICU4J API  <a href="{@docRoot}preview/features/icu4j-framework.html">ICU4J </a>
</p>



<h2 id="gles_32">OpenGL&trade; ES 3.2 API</h2>

<p>Android N  OpenGL ES 3.2 </p>

<ul>
  <li>  <a class="external-link" href="https://www.khronos.org/registry/gles/extensions/ANDROID/ANDROID_extension_pack_es31a.txt">
Android </a></a> (AEP) <code>EXT_texture_sRGB_decode</code> 
  <li>  HDR 
  <li> BaseVertex 
  <li>  WebGL 
</ul>

<p>Android N  OpenGL ES 3.2  API  <code>GLES32</code> 
 OpenGL ES 3.2  <code>&lt;uses-feature&gt;</code>  <code>android:glEsVersion</code> 

 </p>

<p> OpenGL ES  OpenGL ES  <a href="{@docRoot}guide/topics/graphics/opengl.html">OpenGL ES API </a>
</p>


<h2 id="android_tv_recording">Android TV </h2>

<p>Android N  API  Android TV 
 API TV 

 </p>

<p> <a href="{@docRoot}preview/features/tv-recording-api.html">Android TV  API</a></p>


<h2 id="android_for_work">Android for Work</h2>

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

</p>

<h3 id="work_profile_security_challenge"> </h3>

<p>
   N SDK 



<code>ACTION_SET_NEW_PASSWORD</code> <code>ACTION_SET_NEW_PARENT_PROFILE_PASSWORD</code> 



</p>

<p>
   <code>setPasswordQuality()</code><code>setPasswordMinimumLength()</code> PIN 


 <code>getParentProfileInstance()</code>  <code>DevicePolicyManager</code> 


   <code>setOrganizationColor()</code>  <code>setOrganizationName()</code> 


</p>
<h3 id="turn_off_work"> </h3>

<p>




 </p>

<h3 id="always_on_vpn">Always on VPN </h3>

<p> VPN 
 VPN
</p>

<p>
   <code>DevicePolicyManager</code>  <code>setAlwaysOnVpnPackage()</code>  <code>getAlwaysOnVpnPackage()</code>


</p>

<p> VPN VPN  Always on VPN 
 Intent <code>android.net.VpnService</code>

 </p>

<p>
   <strong>Settings&gt;More&gt;Vpn</strong>  <code>VPNService</code>  Always on VPN 


</p>

<h3 id="custom_provisioning"></h3>

<p>
  <code>DevicePolicyManager.EXTRA_PROVISIONING_MAIN_COLOR</code> <code>DevicePolicyManager.EXTRA_PROVISIONING_LOGO_URI</code> 




</p>

<h2 id="accessibility_enhancements"></h2>

<p>Android N Vision Settings
 TalkBack

 </p>

<p>

 Settings &gt; Accessibility 
</p>

<p> Android N 
 API 

</p>

<p> <a href="{@docRoot}preview/setup-sdk.html#docs-dl">API </a>  <code>android.accessibilityservice.GestureDescription
</code></p>


<h2 id="direct_boot"></h2>

<p>




</p>

<p> Android N 



 </p>

<p>


 <code>LOCKED_BOOT_COMPLETED</code> Intent 



 </p>

<a href="{@docRoot}preview/features/direct-boot.html"></a></p>
</p>


<h2 id="key_attestation"></h2>

<p> Android 
 Linux  Android 

</p>

<p>Android N 
 RSA  EC 


 </p>

<p> X.509 

 ECDSA 



</p>

<p> Android  <a class="external-link" href="https://source.android.com/security/verifiedboot/verified-boot.html#bootloader_requirements">bootloader</a> <a class="external-link" href="https://source.android.com/security/trusty/index.html"> (TEE)</a> 


</p>

<ul>
<li></li>
<li><a href="https://source.android.com/security/verifiedboot/index.html" class="external-link"></a></li>
  </ul>

<p><a href="https://source.android.com/security/keystore/" class="external-link"></a>
</p>

<p>Android N 
</p>

<h2 id="network_security_config"></h2>

<p> Android N  APIX509TrustManagerHTTPSTLS


<em></em></p>

  <p></p>
<ul>
<li><b></b> (CA) 
 CA 

</li>
<li><b></b>


</li>
<li><b></b>
</li>
<li><b></b>
</li>
</ul>

<p><a href="{@docRoot}preview/features/security-config.html"></a>
</p>

<h2 id="default_trusted_ca"></h2>

<p> Android N  (CA)
 Android N  CA<a href="{@docRoot}preview/features/security-config.html"></a> CA 


</p>

<h2 id="apk_signature_v2">APK signature scheme v2</h2>

<p>
  Android N  APK Signature Scheme v2 APK 

Android Studio 2.2  Android Gradle 2.2  APK Signature Scheme v2 


</p>

<p>
   APK Signature Scheme v2
 APK Signature Scheme v2 
 Android Studio 2.2  Android Gradle 2.2 

 <code>build.gradle</code>  <code>v2SigningEnabled false</code> 



</p>

<pre>
  android {
    ...
    defaultConfig { ... }
    signingConfigs {
      release {
        storeFile file("myreleasekey.keystore")
        storePassword "password"
        keyAlias "MyReleaseKey"
        keyPassword "password"
        <strong>v2SigningEnabled false</strong>
      }
    }
  }
</pre>

<p class="caution"><strong></strong> APK Signature Scheme v2 

 APK Signature Scheme v2  <code>zipalign</code> 

</p>

<p>
   Android Studio <a href="{@docRoot}studio/publish/app-signing.html#release-mode"></a> Android Gradle <a href="{@docRoot}studio/build/build-variants.html#signing"></a>



</p>

<h2 id="scoped_directory_access"></h2>

<p> Android N  API <a href="{@docRoot}guide/topics/data/data-storage.html#filesExternal"></a> SD 

 API  <code>Pictures</code> 
 API <code>READ_EXTERNAL_STORAGE</code>



</p>

<p> API 
 API  UI

</p>

<p><a href="{@docRoot}preview/features/scoped-folder-access.html"></a>

</p>

<h2 id="keyboard_shortcuts_helper"></h2>

<p>
 Android N Alt + /

<em></em>

 <code>Activity.onProvideKeyboardShortcuts()</code>  <a href="{@docRoot}preview/setup-sdk.html#docs-dl">API </a> 


</p>

<p>
 {@code Activity.requestKeyboardShortcutsHelper()}

</p>

<h2 id="sustained_performance_api"> API</h2>

<p>




</p>

<p>
Android N  (OEM) 

<em></em>


</p>

<p>
 Nexus 6P  N Developer Preview  API


 {@code Window.setSustainedPerformanceMode()} 


</p>

<h2 id="vr">VR </h2>

<p>
Android N  VR  VR 
 VR  CPU  VR 


Android N 
 Android N  VR  <a href="https://developers.google.com/vr/android/"> Android  Google VR SDK</a>

</p>


<h2 id="print_svc"></h2>

<p>
   Android N 

</p>

<p>
  

</p>

<ul>
  <li> <code>PrinterInfo.Builder.setResourceIconId()</code>  ID 

  </li>

  <li> <code>PrinterInfo.Builder.setHasCustomPrinterIcon()</code> <code>android.printservice.PrinterDiscoverySession.onRequestCustomPrinterIcon()</code> 



  </li>
</ul>

<p>
   <code>PrinterInfo.Builder.setInfoIntent()</code> 

</p>

<p>
   <code>android.printservice.PrintJob.setProgress()</code>  <code>android.printservice.PrintJob.setStatus()</code> 



</p>

<p>
   <a href="{@docRoot}preview/setup-sdk.html#docs-dl">API </a>
</p>

<h2 id="framemetrics_api">FrameMetricsListener API</h2>

<p>
FrameMetricsListener API  UI 
API  Pub/Sub API 
 <code><a href="{@docRoot}tools/help/shell.html#shellcommands">adb shell</a>
dumpsys gfxinfo framestats</code>  120 

</p>

<p>
 FrameMetricsListener  UI  USB 
API  {@code adb shell dumpsys gfxinfo} 




 UI 


</p>

<p>
 <code>FrameMetricsListener.onMetricsAvailable()</code> 
 <a href="{@docRoot}preview/setup-sdk.html#docs-dl">API </a>  {@code FrameMetricsListener} 


</p>

<p>
API  {@code FrameMetrics} {@code UNKNOWN_DELAY_DURATION}{@code INPUT_HANDLING_DURATION}{@code ANIMATION_DURATION}{@code LAYOUT_MEASURE_DURATION}{@code DRAW_DURATION}{@code SYNC_DURATION}{@code COMMAND_ISSUE_DURATION}{@code SWAP_BUFFERS_DURATION}{@code TOTAL_DURATION}  {@code FIRST_DRAW_FRAME}






</p>


<h2 id="virtual_files"></h2>

<p>
   Android  Google 




</p>

<p>
  Android N 
<em></em> {@link android.provider.DocumentsProvider}  {@link android.content.Intent#ACTION_VIEW}Intent  URI


Android N 

</p>

<p>
   URI {@link android.content.Intent}  UI
 {@link android.content.ContentResolver#openInputStream(Uri) openInputStream()}  {@link android.content.Intent#CATEGORY_OPENABLE} 




</p>

<p>
   {@link android.app.Activity#onActivityResult onActivityResult()} 

  URI

</p>

<pre>
  // Other Activity code ...

  final static private int REQUEST_CODE = 64;

  // We listen to the OnActivityResult event to respond to the user's selection.
  &#64;Override
  public void onActivityResult(int requestCode, int resultCode,
    Intent resultData) {
      try {
        if (requestCode == REQUEST_CODE &amp;&amp;
            resultCode == Activity.RESULT_OK) {

            Uri uri = null;

            if (resultData != null) {
                uri = resultData.getData();

                ContentResolver resolver = getContentResolver();

                // Before attempting to coerce a file into a MIME type,
                // check to see what alternative MIME types are available to
                // coerce this file into.
                String[] streamTypes =
                  resolver.getStreamTypes(uri, "*/*");

                AssetFileDescriptor descriptor =
                    resolver.openTypedAssetFileDescriptor(
                        uri,
                        streamTypes[0],
                        null);

                // Retrieve a stream to the virtual file.
                InputStream inputStream = descriptor.createInputStream();
            }
        }
      } catch (Exception ex) {
        Log.e("EXCEPTION", "ERROR: ", ex);
      }
  }
</pre>

<p>
   <a href="{@docRoot}guide/topics/providers/document-provider.html"></a>


</p>