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<h1 id="2-2-0" class="showalways">Android Studio 2.2 (September 2016)</h1>

2.2.3（2016 年 12 月）

<p>
  This is a minor update to Android Studio 2.2. It includes a bug fixes
  focused around gradle, the core IDE, and lint.
</p>

<p>
  Highlighted build changes:
</p>

<ul>
  <li>ProGuard version rollback. Due to a <a href=
  "https://sourceforge.net/p/proguard/bugs/625/">correctness issue</a>
  discovered in ProGuard 5.3.1, we have rolled back to ProGuard 5.2.1. We
  have worked with the ProGuard team on getting a fix quickly, and we expect
  to roll forward to ProGuard 5.3.2 in Android Studio 2.3 Canary 3.
  </li>
  <li>Bug fix for <code>aaptOptions</code> <code>IgnoreAssetsPattern</code>
  not working properly (<a href="http://b.android.com/224167">issue
  224167</a>)
  </li>
  <li>Bug fix for Gradle autodownload for Constraint Layout library
    (<a href="https://code.google.com/p/android/issues/detail?id=212128">issue
    212128</a>)
  </li>
  <li>Bug fix for a JDK8/Kotlin compiler + dx issue (<a href=
  "http://b.android.com/227729">issue 227729</a>)
  </li>
</ul>

<p>
  <a href=
  "https://code.google.com/p/android/issues/list?can=1&amp;q=target%3D2.2.3+status%3AReleased+&amp;colspec=ID+Status+Priority+Owner+Summary+Stars+Reporter+Opened&amp;cells=tiles">
  See all bug fixes in 2.2.3</a>.
</p>

2.2.2（2016 年 10 月）

<p>
  This is a minor update to Android Studio 2.2. It includes a number of small
  changes and bug fixes, including:
</p>

<ul>
  <li>When reporting Instant Run issues through the IDE, the report now also
  includes logcat output for <code>InstantRun</code> events. To help us
  improve Instant Run, please <a href=
  "/studio/run/index.html#submit-feedback">enable extra logging and report
  any issues</a>.
  </li>
  <li>A number of small bug fixes for Gradle.
  </li>
  <li>A fix for problems with generating multiple APKs.
  </li>
</ul>

2.2.1（2016 年 10 月）

<p>
  This is a minor update to Android Studio 2.2. It includes several bug fixes
  and a new feature to enable extra logging to help us troubleshoot Instant
  Run issues—to help us improve Instant Run, please <a href=
  "/studio/run/index.html#submit-feedback">enable extra logging and report
  any issues</a>.
</p>

新变化

所有新的布局编辑器都内置自定义工具，以支持 ConstraintLayout。

<li>New <strong><a href=
"http://tools.android.com/tech-docs/layout-inspector">Layout
Inspector</a></strong> lets you examine snapshots of your layout hierarchy
while your app is running on the emulator or a device.
</li>

<li>New <strong><a href="/studio/write/firebase.html">Assistant</a></strong>
window to help you integrate Firebase services into your app.
</li>

<li>New <strong><a href="/studio/debug/apk-analyzer.html">APK
Analyzer</a></strong> tool so you can inspect the contents of your packaged
app.
</li>

<li>New <strong><a href=
"http://tools.android.com/tech-docs/test-recorder">Espresso Test
Recorder</a></strong> tool (currently in beta) to help you create UI tests by
recording your own interactions.
</li>

<li>New <strong><a href=
"http://tools.android.com/tech-docs/build-cache">build cache</a></strong>
(currently experimental) to speed up build performance.
</li>

<li>New <strong>C/C++ build integration with CMake and ndk-build</strong>.
Compile and build new or existing native code into libraries packaged into
your APK, and debug using lldb. For new projects, Android Studio uses CMake
by default, but also supports ndk-build for existing projects. To learn how
to include native code in your Android application, read <a href=
"/studio/projects/add-native-code.html">Add C and C++ Code to Your
Project</a>. To learn how to debug native code with lldb, see <a href=
"/studio/debug/index.html#debug-native">Debug Native Code</a>.
</li>

<li>New <strong><a href="/studio/intro/index.html#sample-code">Samples
Browser</a></strong> so you can easily look up Google Android sample code
from within Android Studio to jump start app development.
</li>

<li>New <strong>Merged Manifest Viewer</strong> to help you diagnose how your
manifest file merges with your app dependencies across project build
variants.
</li>

<li>The <strong>Run</strong> window now contains log messages for the current
running app. Note that you can configure the <a href=
"/studio/debug/am-logcat.html">logcat Monitor</a> display, but not the
<strong>Run</strong> window.
</li>

<li>New <strong><a href="/studio/run/emulator.html">Android
Emulator</a></strong> features:
  <ul>
    <li>Added new <strong>Virtual</strong> <strong>Sensors</strong> and
    <strong>Cellular</strong> &gt; <strong>Signal Strength</strong> controls.
    </li>
    <li>Added an <strong>LTE</strong> option to the <strong>Cellular</strong>
    &gt; <strong>Network type</strong> control.
    </li>
    <li>Added simulated vertical swipes for scrolling through vertical menus
    with a mouse wheel.
    </li>
  </ul>
</li>

<li>New <strong><a href="/studio/run/rundebugconfig.html">Run/Debug
Configuration</a></strong> features:
  <ul>
    <li>The <strong>Debugger</strong> tab of the Android App and Android
    Tests templates now contain several new options for debugging with LLDB.
    </li>
    <li>The <strong>Profiling</strong> tab of the Android App and Android
    Tests templates now contain a <strong>Capture GPU Commands</strong>
    option for enabling GPU tracing. You can display GPU traces in the GPU
    Debugger (a beta feature).
    </li>
    <li>The Android Tests template now has a <strong>Firebase Test Lab Device
    Matrix</strong> option for the <strong>Deployment Target</strong>.
    </li>
    <li>The Native Application template has been deprecated. If you use this
    template in a project, Android Studio automatically converts it to the
    Android App template.
    </li>
    <li>The Android Application template has been renamed to Android App.
    </li>
  </ul>
</li>

<li>Improved installation, configuration, performance, and UI features in the
<strong><a href="/studio/debug/am-gpu-debugger.html">GPU
Debugger</a></strong> (currently in beta).
</li>

<li>Android Studio now comes bundled with <strong>OpenJDK 8</strong>.
Existing projects still use the JDK specified in <strong>File &gt; Project
Structure &gt; SDK Location</strong>. You can switch to use the new bundled
JDK by clicking <strong>File &gt; Project Structure &gt; SDK
Location</strong> and checking the <strong>Use embedded JDK</strong>
checkbox.
</li>

<li>Added new <strong>help menus and buttons</strong> in the UI so you can
more easily find the online documentation.
</li>

变更

将 Android Studio 代码库从 IntelliJ 15 更新为 IntelliJ 2016.1
Instant Run 现在需要安装与目标设备 API 级别对应的平台 SDK。
如果用户在工作资料下或以次要用户身份运行应用，系统会自动停用 Instant Run。
修复了 Instant Run 的许多可靠性问题，这些问题会使更改无法部署或导致应用崩溃：
- 某些应用资产未部署到正在运行的应用中。（bug：#213454）
- 当用户在 Instant Run 和非 Instant Run 会话（可序列化类未在其中定义 serialVersionUID）之间切换时，应用崩溃。（bug：#209006）
- Instant Run 不会反映样式更改。（bug：#210851）
- Instant Run 会话不可靠，会导致 FileNotFoundException。（bug：#213083）
- 在为 KitKat 执行完全重新构建之前，不会反映对可绘制对象的更改。（bug：#21530）
- 当自定义 sourceSets 包含嵌套路径时，Instant Run 不会反映资源更改。（bug：#219145）
- 如果已更改的类包含具有枚举值的注解，热交换和温和交换就会不起作用。（bug：#209047）
- Instant Run 不会反映对注解数据的更改。（bug：#210089）
- 如果您在 Android Studio 外部进行更改，Instant Run 不会选择代码更改。（bug：#213205）
- 由于安全令牌不匹配，Instant Run 会话不可靠。（bug：#211989）
- 对于无法正确支持 run-as 的设备，冷交换会失败。（bug：#210875）
- 应用在 Instant Run 重启后崩溃。（bug：#219744）
- 从 Instant Run 切换到 Instant Debug 时观察到 ClassNotFoundException。（bug：#215805）

<li>Improved performance for <strong>Gradle sync</strong> within the IDE,
especially for large projects.
</li>

<li>Improved build times for both full and incremental builds with new app
packaging code.
</li>

<li>Improved <strong>Jack compiler performance and features</strong>,
including support for annotation processors and dexing in process. To learn
more, read the <a href=
"/studio/releases/gradle-plugin.html#revisions">Android plugin for Gradle
2.2.0 release notes</a>.
</li>

<li>Removed the <strong>Scale</strong> AVD property from the AVD Manager.
</li>

<li>The Android Emulator <strong>-port</strong> and <strong>-ports</strong>
command-line options now report which ports and serial number the emulator
instance is using, and warn if there are any issues with the values you
provided.
</li>

<li>Improved the <strong><a href=
"/studio/write/create-java-class.html">Create New Class dialog</a></strong>
and the corresponding file templates. <strong>Note:</strong> If you've
previously customized the <strong>AnnotationType</strong>,
<strong>Class</strong>, <strong>Enum</strong>, <strong>Interface</strong>, or
<strong>Singleton</strong> file templates, you need to modify your templates
to comply with the new templates or you won’t be able to use the new fields
in the <strong>Create New Class</strong> dialog.
</li>

<li>Improved the <strong><a href=
"/studio/write/vector-asset-studio.html">Vector Asset Studio</a></strong>
user interface and added support for Adobe Photoshop Document (PSD) files.
</li>

<li>Improved the <strong><a href=
"/studio/write/image-asset-studio.html">Image Asset Studio</a></strong> user
interface.
</li>

<li>Improved the <strong>Theme Editor</strong>'s Resource Picker.
</li>

<li>Fixed memory leaks and reduced overall memory usage in Android Studio.
</li>

<li>Added a <strong>Background</strong> button in the <strong><a href=
"/studio/intro/update.html#sdk-manager">SDK Manager</a></strong> so you can
get back to work and install your packages in the background.
</li>

<li>Improved <strong><a href="/studio/intro/accessibility.html">Accessibility
features</a></strong>, including support for screen readers and keyboard
navigation.
</li>

<li>Enhanced <strong>Code Analysis</strong> includes code quality checks for
Java 8 language usage and more cross-file analysis.
</li>

<li>Several toolbar icons have changed.
</li>