Android第二次翻译动画不一样

Question

我创建了一个非常简单的平移动画，当第一次按下按钮时，图像视图将向左移动，第二次将向右移动。距离完全一样

但第二次图像移动得更多，实际上并没有回到原来的位置。更准确地说，第二次图像移动了两倍的距离。为什么？

private var direction = 1
fun move() {
    val animatorX = ObjectAnimator.ofFloat(draggableImage1, "translationX", direction*(-100f))
    val animatorY = ObjectAnimator.ofFloat(draggableImage1, "translationY", 0f)
    animatorX.duration = (500)
    animatorY.duration = (500)
    val animationSet = AnimatorSet()
    animationSet.playTogether(animatorX, animatorY)
    animationSet.start()
    if (direction == 1) {direction = -1} else {direction = 1}
}

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main2)

        button.setOnClickListener{move()}
    }

Answer 1

您可以使用下面的动画代码，试试这个更新后的答案。

val animatorX: ObjectAnimator?
    if (direction == 1) {
        direction = -1
        animatorX = ObjectAnimator.ofFloat(star, "translationX", -100f)
    } else {
        direction = 1
        animatorX = ObjectAnimator.ofFloat(star, "translationX", 200f)
    }
    animatorX.duration = 500
    animatorX.start()

Answer 2

the second time the image goes twice the distance

因为在第一次动画之后它的 x 位置是 (initial x - 100) 并且第二次你将 x 动画化为 100 。所以第二次它从 -100 到 100 并且它与第一次的两倍距离

要向右移动，请将 translationX 设置为 0

private var direction = 1
fun move() {

    var distance = -100f
    if (direction == -1){
        distance = 0f
    }

    val animatorX = ObjectAnimator.ofFloat(draggableImage1, "translationX", distance)
    val animatorY = ObjectAnimator.ofFloat(draggableImage1, "translationY", 0f)

    animatorX.duration = (500)
    animatorY.duration = (500)
    val animationSet = AnimatorSet()
    animationSet.playTogether(animatorX, animatorY)
    animationSet.start()
    if (direction == 1) {direction = -1} else {direction = 1}
}

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main2)

    button.setOnClickListener{move()}
}

Answer 3

我确实希望有一种方法可以重置动画师，但如果没有，我确实找到了解决方法。你应该得到初始坐标，然后用它来计算平移：

val animatorX = ObjectAnimator.ofFloat(draggableImage1, "translationX", (draggableImage1.x - initalLeft) -(direction*100f))

Android第二次翻译动画不一样

Android translate animation is different the second time

android

android-animation

kotlin