Merge "cherrypick from mnc-io-docs docs: Updated APK Signature Scheme v2 doc"...

<p>

  Android N introduces APK Signature Scheme v2, a new app-signing scheme that

  offers faster app install times and better protection against unauthorized

  alterations to APK files. Android Studio 2.2 and Gradle provide built-in

  support for APK Signature Scheme v2.

  offers faster app install times and more protection against unauthorized

  alterations to APK files. By default, Android Studio 2.2 and the Android

  Plugin for Gradle 2.2 sign your app using both APK Signature Scheme v2 and

  the traditional signing scheme, which uses JAR signing.

</p>

<p>

  Although we recommend applying APK Signature Scheme v2 to your app, the new

  scheme is not mandatory. If your app doesn't build properly when using the

  APK Signature Scheme v2, you can use the traditional signing scheme—which

  uses JAR signing—instead. To use the traditional scheme, open the

  module-level <code>build.gradle</code> file and add the

  <code>v2SigningEnabled</code> parameter to your release signing

  configuration, setting this parameter's value to <code>false</code>:

  Although we recommend applying APK Signature Scheme v2 to your app, this new

  scheme is not mandatory. If your app doesn't build properly when using APK

  Signature Scheme v2, you can disable the new scheme. The disabling process

  causes Android Studio 2.2 and the Android Plugin for Gradle 2.2 to sign your

  app using only the traditional signing scheme. To sign with only the

  traditional scheme, open the module-level <code>build.gradle</code> file, then

  add the line <code>v2SigningEnabled false</code> to your release signing

  configuration:

</p>

<pre>

  }

</pre>

<p class="caution"><strong>Caution: </strong> If you sign your app using APK

  Signature Scheme v2 and make further changes to the app, the app's signature

  is invalidated. For this reason, use tools such as <code>zipalign</code>

  before signing your app using APK Signature Scheme v2, not after.

</p>

<p>

  For more information, see the following guides, which describe how to <a href=

  "{@docRoot}studio/tools/publishing/app-signing.html#release-mode"> sign an app

  in Android Studio</a> and how to <a href=

  For more information, read the Android Studio documents that describe how to

  <a href="{@docRoot}studio/tools/publishing/app-signing.html#release-mode">

  sign an app</a> in Android Studio and how to <a href=

  "{@docRoot}studio/tools/building/configuring-gradle.html#signing"> configure

  the Gradle build file for signing apps</a>.

  the build file for signing apps</a> using the Android Plugin for Gradle.

</p>

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