Android 如何使用 StateListAnimator？
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How to use StateListAnimator?
提问by nhaarman
From the docs:
从文档：
The new StateListAnimator class lets you define animators that run when the state of a view changes. The following example shows how to define an StateListAnimator as an XML resource:
新的 StateListAnimator 类允许您定义在视图状态更改时运行的动画器。以下示例显示了如何将 StateListAnimator 定义为 XML 资源：
<!-- animate the translationZ property of a view when pressed --> <selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<set>
<objectAnimator android:propertyName="translationZ"
android:duration="100"
android:valueTo="2"
android:valueType="floatType"/>
<!-- you could have other objectAnimator elements
here for "x" and "y", or other properties -->
</set>
</item>
<item android:state_enabled="true"
android:state_pressed="false"
android:state_focused="true">
<set>
<objectAnimator android:propertyName="translationZ"
android:duration="100"
android:valueTo="2"
android:valueType="floatType"/>
</set>
</item>
</selector>
However, it says nothing about how to actually usethis xml file. There seems to be no method on the Resourcesclass to get a StateListAnimator, and the StateListAnimatorclass does not provide any info either.
但是，它没有说明如何实际使用这个 xml 文件。Resources类上似乎没有获取 a 的方法StateListAnimator，并且StateListAnimator该类也不提供任何信息。
How can we use this?
我们如何使用它？
回答by harism
In Android La new xml attribute has been added for View:
在Android L 中，为View添加了一个新的 xml 属性：
android:stateListAnimator : Sets the state-based animator for the View.
Additionally for instantiating StateListAnimatorobject programmatically a new method :
此外，为了以编程方式实例化StateListAnimator对象，还有一个新方法：
loadStateListAnimator(Context context, int id)
has been added to AnimatorInflater.
已添加到AnimatorInflater。
These can be found on Android Ldeveloper preview documentation package.
这些可以在Android L开发者预览文档包中找到。
回答by Radesh
I use this code in java and works fine
我在java中使用此代码并且工作正常
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
crd.setStateListAnimator(AnimatorInflater.loadStateListAnimator(ctx,
R.drawable.card_smooth_shadow));
}
And my animator/card_smooth_shadow.xml
还有我的动画师/card_smooth_shadow.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<set>
<objectAnimator android:propertyName="translationZ"
android:duration="@android:integer/config_shortAnimTime"
android:valueTo="10dp"
android:valueType="floatType"/>
</set>
</item>
<item
android:state_pressed="false">
<set>
<objectAnimator android:propertyName="translationZ"
android:duration="100"
android:valueTo="2dp"
android:valueType="floatType"/>
</set>
</item>
RESULT
结果
