Docs: Added AS 2.0 Release Notes

everything you need to begin developing Android apps:</p>

everything you need to begin developing Android apps:</p>

<ul>

<ul>

<li>IntelliJ IDE + Android Studio plugin</li>

  <li>IntelliJ IDE + Android Studio plugin

<li>Android SDK Tools</li>

  </li>

<li>Android Platform-tools</li>

<li>A version of the Android platform</li>

  <li>Android SDK Tools

<li>A version of the Android system image for the emulator</li>

  </li>

  <li>Android Platform-tools

  </li>

  <li>A version of the Android platform

  </li>

  <li>Android Emulator with an Android system image including Google Play

  Services

  </li>

</ul>

</ul>

<p>For an introduction to Android Studio, read the

<p>For an introduction to Android Studio, read the

<p>The sections below provide notes about successive releases of

<p>The sections below provide notes about successive releases of

Android Studio, as denoted by revision number. </p>

Android Studio, as denoted by revision number. </p>

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    <img src="{@docRoot}assets/images/styles/disclosure_up.png" class="toggle-content-img"

    <img src="{@docRoot}assets/images/styles/disclosure_up.png" class="toggle-content-img"

      alt=""/>Android Studio v2.0.0</a> <em>(March 2016)</em>

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    <p class="note">

      <strong>Note:</strong> If you are developing for the N Developer Preview, you

      should use Android Studio 2.1 Preview. Android Studio 2.0 does not support

      all the features required to target the N Preview. To learn more, read about

      how to properly <a href="{@docRoot}preview/setup-sdk.html">set up your

      developer environment</a> for the N Preview.

    </p>

    <p>

      <strong>Instant Run</strong>:

    </p>

    <ul>

      <li>Android Studio now deploys clean builds faster than ever before.

      Additionally, pushing incremental code changes to the emulator or a physical

      device is now almost instantaneous. Review your updates without redeploying a

      new debug build or, in many cases, without restarting the app.

      </li>

      <li>Instant Run supports pushing the following changes to a running app:

        <ul>

          <li>Changes to the implementation of an existing instance method or

          static method

          </li>

          <li>Changes to an existing app resource

          </li>

          <li>Changes to structural code, such as a method signature or a static

          field (requires a target device running API level 21 or higher).

          </li>

        </ul>

      </li>

      <li>Read the documentation to learn more <a href=

      "{@docRoot}tools/building/building-studio.html#instant-run">about Instant

      Run</a>.

        <p class="note">

          <strong>Note:</strong> Instant Run is supported only when you deploy the

          debug build variant, use <a href=

          "{@docRoot}tools/revisions/gradle-plugin.html#revisions">Android Plugin for

          Gradle version 2.0.0</a> or higher, and configure your app's module-level

          <code>build.gradle</code> file for <code>minSdkVersion 15</code> or higher.

          For the best performance, configure your app for <code>minSdkVersion

          21</code> or higher.

        </p>

      </li>

    </ul>

    <p>

      <strong>Android Emulator 2.0</strong>:

    </p>

      <ul>

        <li>Performance improvements:

        </li>

          <ul>

            <li>Emulator now uses CPU acceleration on x86 emulator system images by

            default.

            </li>

            <li>Added <a href="{@docRoot}training/articles/smp.html">SMP</a> support

            to take advantage of host multi-core architecture when emulating Android

            6.0 (API level 23) or higher, resulting in much better performance and

            speed than the physical counterpart. Also with SMP support, you can test

            apps that specifically target multi-core Android devices.

            </li>

            <li>Improved data and APK push-pull protocol between the the <a href=

            "{@docRoot}tools/help/adb.html">Android Debug Bridge</a> and devices

            running Android 5.0 (API level 21) or higher. See speed improvements up

            to five times faster than using a physical device.

            </li>

          </ul>

        <li>Extended UI controls and a floating toolbar provide easy access to features

        previously available only through the command line, such as taking screen

        captures, adjusting the battery level, rotating the screen, and managing

        virtual calls.

        </li>

        <li>Upload KML and GPX files to play back a set of custom location points.

        </li>

        <li>Dynamically resize the emulator by dragging a corner or zoom into the

        emulator window.

        </li>

        <li>Install APKs or add media files to the emulator’s internal SD card by

        dragging and dropping files into the emulator window.

        </li>

        <li>Simulate multi-touch input. While interacting with the emulator screen,

        enter multi-touch mode by holding down the <strong>Ctrl</strong> key on

        Windown/Linux, or <strong>Command</strong> key on Mac OSX.

        </li>

        <li>Improvements to the <a href=

        "{@docRoot}tools/devices/managing-avds.html">Android Virtual Device

        Manager</a>:

          <ul>

            <li>System images are now categorized under the following tabs:

            <em>Recommended</em>, <em>x86</em>, and <em>Other</em>.

            </li>

            <li>Under advanced settings, you can enable multi-core support and

            specify the number of cores the emulator can use.

            </li>

            <li>Under advanced settings, you can determine how graphics are rendered

            on the emulator by selecting one of the following options:

              <ul>

                <li>

                  <strong>Hardware:</strong> use you computer's graphics card for

                  faster rendering.

                </li>

                <li>

                  <strong>Software:</strong> use software-based rendering.

                </li>

                <li>

                  <strong>Auto:</strong> let the emulator decide the best option. This

                  is the default setting.

                </li>

              </ul>

            </li>

          </ul>

        </li>

        <li>Read the documentation to find out more about <a href=

        "{@docRoot}tools/devices/emulator.html">using the Android Emulator</a>.

        </li>

      </ul>

<p><strong>New additions to Lint:</strong></p>

  <ul>

    <li>Inspection of {@code switch} statements using {@link

    android.support.annotation.IntDef @IntDef} annotated integers to make sure

    all constants are handled. To quickly add any missing statements, use the the

    intention action drop-down menu and select <b>Add Missing @IntDef

    Constants</b>.

    </li>

    <li>Flags for incorrect attempts to use string interpolation to insert

    version numbers in the {@code build.gradle} file.

    </li>

    <li>Flags for anonymous classes that extend the {@link android.app.Fragment

    Fragment} class.

    </li>

    <li>Flags for native code in unsafe locations, such as the {@code res/} and {@code

    asset/} folders. This flag encourages storing native code in the {@code libs/}

    folder, which is then securely packaged into the application’s {@code

    data/app-lib/} folder at install time. <a class="external-link" href=

    "https://android-review.googlesource.com/#/c/169950/">AOSP: #169950</a>

    </li>

    <li>Flags for unsafe calls to {@link java.lang.Runtime#load(java.lang.String)

    Runtime.load()} and {@link java.lang.System#load(java.lang.String)

    System.load()} calls. <a class="external-link" href=

    "https://android-review.googlesource.com/#/c/179980/">AOSP: #179980</a>

    </li>

    <li>Find and remove any unused resources by selecting <b>Refactor &gt; Remove

    Unused Resources</b> from the menu bar. Unused resource detection now

    supports resources only referenced by unused resources, references in raw

    files such as {@code .html} image references, and {@code tools:keep} and

    {@code tools:discard} attributes used by the Gradle resource shrinker, while

    considering inactive source sets (such as resources used in other build

    flavors) and properly handling static field imports.

    </li>

    <li>Checks that implicit API references are supported on all platforms

    targeted by {@code minSdkVersion}.

    </li>

    <li>Flags improper usage of {@link android.support.v7.widget.RecyclerView}

    and {@link android.os.Parcelable}.

    </li>

    <li>{@link android.support.annotation.IntDef @IntDef}, {@link

    android.support.annotation.IntRange @IntRange}, and {@link

    android.support.annotation.Size @Size} inspections are now also checked for

    {@code int} arrays and varargs.

    </li>

  </ul>

<p><strong>Additional Improvements</strong>:</p>

    <ul>

      <li>Improved AAPT packaging times by specifying deploy target before the app

      is built. This allows Android Studio to efficiently package only the

      resources required by the specified device.

      </li>

      <li>Added Cloud Test Lab integration to provide on-demand app testing with

      the convenience and scalability of a cloud service. Learn more about how you

      can <a href="{@docRoot}training/testing/start/index.html#run-ctl">use Cloud

      Test Lab with Android Studio</a>.

      </li>

      <li>Added a preview of the new <a class="external-link" href=

      "//tools.android.com/tech-docs/gpu-profiler">GPU Debugger</a>. For graphics

      intensive applications, you can now visually step through your OpenGL ES code

      to optimize your app or game.

      </li>

      <li>Added support for Google App Indexing integration and testing. Add deep

      links, app indexing, and search functionality to your apps to help drive more

      traffic to your app, discover which app content is used most, and attract new

      users. Test and validate your URL links in your app all within Android

      Studio. Learn more about implementing and testing <a href=

      "{@docRoot}tools/help/app-link-indexing.html">Deep Link and App Indexing

      APIs</a>.

      </li>

      <li>Upgrades from the latest IntelliJ 15 release, including improved code

      analysis and performance. See <a class="external-link" href=

      "https://www.jetbrains.com/idea/whatsnew">What's New in IntelliJ</a> for a

      complete description of the new features and enhancements.

      </li>

      <li>XML editor auto-complete now adds quotations marks when completing

      attributes. To check if this option is enabled, open the <b>Setting</b> or

      <b>Preferences</b> dialogue, navigate to <b>Editor &gt; General &gt; Smart

      Keys</b>, and check the box next to <b>Add quotes for attribute value on

      attribute completion</b>. <a class="external-link" href=

      "//b.android.com/195113">Issue: 195113</a>

      </li>

      <li>The XML editor now supports code completion for <a href=

      "{@docRoot}tools/data-binding/guide.html#layout_details">data binding</a>

      expressions.

      </li>

    </ul>

  </div>

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    <img src="{@docRoot}assets/images/styles/disclosure_down.png" class="toggle-content-img"

      alt=""/>Android Studio v1.5.1</a> <em>(December 2015)</em>

      alt=""/>Android Studio v1.5.1</a> <em>(December 2015)</em>

  </p>

  </p>

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