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<html devsite><head>
<meta name="book_path" value="/_book.yaml"/>
<meta name="project_path" value="/_project.yaml"/>
</head>
<body>
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Copyright 2018 The Android Open Source Project
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<h1 id="implementing_synchronized_app_transitions" class="page-title">实现同步应用转换</h1>
<p>同步应用转换是 Android 9 中的一项功能，可以改进现有的应用转换架构。当用户打开、关闭应用或在应用之间切换时，SystemUI 或启动器（主屏幕）进程会发送逐帧控制动画的请求，同时保证在视图动画和窗口动画之间进行同步。SystemUI 或启动器在动画过程中绘制新帧时，会在动画应用表面请求一个不同的转换，此转换可以确定应用在屏幕上的组成形式，并标记要与 SystemUI 或启动器目前正在绘制的帧同步的请求（表面事务）。</p>
<p>此过程可以实现无法在 Android 8.x 及更低版本中实现的新应用转换动画。例如，您可以通过<a href="/devices/tech/display/images/app-launch-animation.mp4">应用启动动画</a>将主屏幕图标无缝转换到应用表面，并可以通过<a href="/devices/tech/display/images/notification-launch-animation.mp4">通知启动动画</a>将通知转换到应用表面。</p>
<h2 id="examples_and_source">示例和来源</h2>
<p>请参阅以下参考来了解这项功能。</p>
<ul>
<li><p><a href="https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/app/ActivityOptions.java"><code>ActivityOptions.makeRemoteAnimation</code></a></p></li>
<li><p><a href="https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/view/"><code>RemoteAnimationAdapter</code></a></p></li>
<li><p><a href="https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/view/"><code>RemoteAnimationRunner</code></a></p></li>
<li><p><a href="https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/app/Activity.java#7869"><code>Activity.registerRemoteAnimations</code></a></p></li>
</ul>
<p>有关通知启动动画的参考实现，请参阅 <a href="https://android.googlesource.com/platform/frameworks/base/+/master/packages/SystemUI/src/com/android/systemui/statusbar/notification/"><code>ActivityLaunchAnimator.java</code></a>。</p>
<h2 id="implementation">实现</h2>
<p>您可以根据需要在启动器/系统界面上实现这项功能，也可以在 SystemUI/Launcher3 中使用 AOSP 实现。</p>
<aside class="note"><strong>注意</strong>：<span>这项功能会增加 GPU 和 CPU 在动画期间的负载。</span></aside>
<h2 id="validation">验证</h2>
<p>要验证动画效果，请衡量控制应用（即 SystemUI 或启动器）在动画期间的性能（如<a href="https://developer.android.com/training/testing/performance">测试界面性能</a>中所述）。</p>
</body></html>
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