//動畫XML animator.anim_alpha
<objectAnimator xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="1000"
    android:propertyName="alpha"
    android:valueTo="0.1f" />
    
//載入動畫    
AnimatorInflater.loadAnimator(this, R.animator.anim_alpha)
    .apply {
        setTarget(textView)
        start()
    }

 //建立一個1.0~0.1之間漸變的動畫
 val animation = ValueAnimator.ofFloat(1.0f, 0.1f)
 //監聽動畫值的改變
 animation.addUpdateListener { animation ->
     //在這裡取得從1.0~0.1之間的每個值
     textView.alpha = animation.animatedValue as Float
     textView.requestLayout()
 }
 //動畫期間
 animation.duration = 2000
 animation.start()

class BezierEvaluator(private val controlPoint: Point) : TypeEvaluator<Point> {
    override fun evaluate(t: Float, startValue: Point, endValue: Point): Point {
        val x =
            ((1 - t) * (1 - t) * startValue.x.toFloat() 
            	+ 2f * t * (1 - t) * controlPoint.x.toFloat() 
            	+ t * t * endValue.x.toFloat()).toInt()
        val y =
            ((1 - t) * (1 - t) * startValue.y.toFloat() 
            	+ 2f * t * (1 - t) * controlPoint.y.toFloat() 
            	+ t * t * endValue.y.toFloat()).toInt()
        return Point(x, y)
    }
}

//步驟1：取得imageView、title

val imageView = view!!.findViewById<View>(R.id.sceneryImageView)
val title = view.findViewById<View>(R.id.sceneryTitle)

//步驟2：將imageView、title 設定Transition Name，這裡的Transition Name會與DetailActivity一樣
val activityOptions = ActivityOptionsCompat.makeSceneTransitionAnimation(
        this,
        Pair(imageView, DetailActivity.TRANSITION_SCENERY_IMAGE_NAME),
        Pair(title, DetailActivity.TRANSITION_SCENERY_TITLE_NAME)
)

//步驟3：startActivity，並將activityOptions傳入
startActivity(intent, activityOptions.toBundle())

setTransitionName(sceneryImageView, TRANSITION_SCENERY_IMAGE_NAME)
setTransitionName(sceneryTitle, TRANSITION_SCENERY_TITLE_NAME)

private fun showDetail() {
    isShow = true
    //Clone layout2
    val constraintSet = ConstraintSet()
    constraintSet.clone(this, R.layout.layout2)
    //設定動畫方式
    val transition = ChangeBounds()
    transition.interpolator = AnticipateOvershootInterpolator(1.0f)
    transition.duration = 1000
    //開始動畫
    TransitionManager.beginDelayedTransition(constraintLayout, transition)
    constraintSet.applyTo(constraintLayout)
}

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="240dp"
    android:height="240dp"
    android:viewportHeight="24.0"
    android:viewportWidth="24.0">
    <path
        android:name="iconPath"
        android:fillColor="#274fe1"
        android:pathData="M5,8 V16 H19 V8" />
</vector>

<objectAnimator xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="600"
    android:interpolator="@android:interpolator/linear"
    android:propertyName="pathData"
    android:valueFrom="M8,5 V19 H16 V5"
    android:valueTo="M5,8 V16 H19 V8"
    android:valueType="pathType" />

//objectAnimator
<objectAnimator xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="2000"
    android:propertyName="trimPathStart"
    android:valueFrom="0"
    android:valueTo="1"
    android:valueType="floatType" />
    
//Vector Drawable
<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:height="24dp"
    android:viewportHeight="24.0"
    android:viewportWidth="24.0"
    android:width="24dp">
    <path
        android:name="line"
        android:strokeColor="#0c6bf9"
        android:strokeWidth="1.5"
        android:pathData="M0,20 L24,20"/>
</vector>
    
//動畫
<animated-vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/line">
    <target
        android:name="line"
        android:animation="@animator/anim_trim_path_end_0_to_1" />
</animated-vector>