Android 使用 ChangeImageTransform 共享元素转换在两个 Activity 之间设置 ImageView 动画
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Animate ImageView between two activities using shared element transitions with ChangeImageTransform
提问by iForests
I am trying to animate one ImageView to another position between two activities in Android API level 21. Since "MoveImage" in Android L Preview has been removed, I use "ChangeImageTransform" instead, but the sample code in documents doesn't work out (the two images animated separately).
我试图在 Android API 级别 21 中将一个 ImageView 动画到两个活动之间的另一个位置。由于 Android L Preview 中的“MoveImage”已被删除，我改用“ ChangeImageTransform”，但文档中的示例代码不起作用（两个图像分别动画）。
<transitionSet xmlns:android="http://schemas.android.com/apk/res/android">
<changeImageTransform>
<targets>
<target android:targetId="@id/ivA" />
<target android:targetId="@id/ivB" />
</targets>
</changeImageTransform>
</transitionSet>
Is there any working example? Thanks!
有没有工作的例子？谢谢！
回答by Yi-Ping Shih
To make a screen transition animation between two activities that have a shared element, you can read this articleand follow the mentioned steps:
要在具有共享元素的两个活动之间制作屏幕过渡动画，您可以阅读本文并按照上述步骤操作：
- Enable window content transitions in your theme.
- Specify a shared elements transition in your style.
- Define your transition as an XML resource.
- Assign a common name to the shared elements in both layouts with the android:transitionName attribute.
- Use the ActivityOptions.makeSceneTransitionAnimation() method.
- 在您的主题中启用窗口内容转换。
- 在您的样式中指定共享元素过渡。
- 将您的转换定义为 XML 资源。
- 使用 android:transitionName 属性为两个布局中的共享元素分配一个通用名称。
- 使用 ActivityOptions.makeSceneTransitionAnimation() 方法。
About the 3rd step, according to the documentation:
关于第三步，根据文档：
In combination with ChangeBounds, ChangeImageTransform allows ImageViews that change size, shape, or ImageView.ScaleType to animate contents smoothly.
与 ChangeBounds 结合，ChangeImageTransform 允许更改大小、形状或 ImageView.ScaleType 的 ImageViews 平滑地为内容设置动画。
The res/transition/your_transition.xml should be like this:
res/transition/your_transition.xml 应该是这样的：
<transitionSet xmlns:android="http://schemas.android.com/apk/res/android">
<changeBounds>
<targets>
<target android:targetId="@id/ivA" />
<target android:targetId="@id/ivB" />
</targets>
</changeBounds>
<changeImageTransform>
<targets>
<target android:targetId="@id/ivA" />
<target android:targetId="@id/ivB" />
</targets>
</changeImageTransform>
</transitionSet>
or simply like this if only ivA and ivB need to be animated:
或者只是这样，如果只需要 ivA 和 ivB 需要动画：
<transitionSet xmlns:android="http://schemas.android.com/apk/res/android">
<changeBounds/>
<changeImageTransform/>
</transitionSet>
回答by formica
I have got this working following this guide, a few others, and the referenced material.
我按照本指南、其他一些指南和参考资料进行了这项工作。
A transition set in this style. I put this under res/transition:
以这种风格设置的过渡。我把它放在 res/transition 下：
<transitionSet xmlns:android="http://schemas.android.com/apk/res/android">
<changeBounds>
<targets>
<target android:targetId="@id/ivA" />
<target android:targetId="@id/ivB" />
</targets>
</changeBounds>
<changeImageTransform>
<targets>
<target android:targetId="@id/ivA" />
<target android:targetId="@id/ivB" />
</targets>
</changeImageTransform>
</transitionSet>
In the source and target ImageViews, you need to add a name tag. The name must be the same.
在源和目标 ImageViews 中，需要添加名称标签。名称必须相同。
<ImageView
...
android:transitionName="MYTRANSITIONVIEW"
/>
In styles.xml, add to the application theme:
在styles.xml中，添加到应用主题：
<item name="android:windowContentTransitions">true</item>
<item name="android:windowActivityTransitions">true</item>
<item name="android:windowSharedElementEnterTransition">@transition/my_transition</item>
<item name="android:windowSharedElementExitTransition">@transition/my_transition</item>
I am running this inside a fragment so I start the new activity like this:
我在一个片段中运行它，所以我开始这样的新活动：
Bundle bundle = null;
if (activity != null) {
ActivityOptionsCompat options =
ActivityOptionsCompat.makeSceneTransitionAnimation(activity, Frag2_, "MYTRANSITIONVIEW");
bundle = options.toBundle();
}
activity.startActivity(i, bundle);
It works on API 21 clients. It did not work on an API 16 client as the XML tags are not valid.
它适用于 API 21 客户端。它不适用于 API 16 客户端，因为 XML 标记无效。
I hope this helps.
我希望这有帮助。
Slight update, to get the reverse transition on exit, I had to call
轻微更新，为了在退出时获得反向转换，我不得不打电话
supportFinishAfterTransition();
rather than finish();
而不是完成（）；
