android - 如何在 Kotlin 中为动画列表设置动画？

Question

我在 drawables 中有一个动画列表 XML:

<animation-list xmlns:android="http://schemas.android.com/apk/res/android" android:oneshot="false">
    <item android:duration="40" android:drawable="@drawable/animated_person_0 />
    <item android:duration="40" android:drawable="@drawable/animated_person_1 />
    <item android:duration="40" android:drawable="@drawable/animated_person_2 />
</animated-list>

我从我的 content_main.xml 调用了 list:

<ImageView
    ...
    android:id="@+id/animatedPerson"
    android:src="@drawable/animatedperson"
    ...
/>

现在无论我用我的代码尝试什么，我都无法启动动画。

Answer 1

在 Java 中是这样的:

// Get the background, which has been compiled to an AnimationDrawable object.
AnimationDrawable frameAnimation = (AnimationDrawable) img.getBackground();

// Start the animation (looped playback by default).
frameAnimation.start();

所以 Kotlin 会非常相似:

// Get the background, which has been compiled to an AnimationDrawable object.
val frameAnimation: AnimationDrawable = img.background as AnimationDrawable

// Start the animation (looped playback by default).
frameAnimation.start()