问题描述
在 ViewHolder 中，单击 RecyclerView 项时我正在执行此缩放动画
override fun onTouch(v: View?,event: MotionEvent?): Boolean {
if (event != null && v != null) {
when (event.action) {
MotionEvent.ACTION_DOWN -> {
v.scaleDown()
}
MotionEvent.ACTION_CANCEL -> {
v.scaleUp()
}
MotionEvent.ACTION_UP -> {
v.performClick()
v.scaleUp()
}
}
return true
} else {
return false
}
}
private fun View.scaleUp() {
val scaleXAnimation = ObjectAnimator.ofFloat(this,"scaleX",scaleX,maxScale)
val scaleYAnimation = ObjectAnimator.ofFloat(this,"scaleY",scaleY,maxScale)
val animset = AnimatorSet().also {
it.playTogether(scaleXAnimation,scaleYAnimation)
it.duration = scaleAnimationDuration
it.interpolator = LinearInterpolator()
it.start()
}
}
但是这个实现也允许在滚动时缩放视图。
recycler-view 滚动时，有没有办法阻止触摸事件？
或者有什么其他方式可以在点击项目时实现按比例缩小的动画？
解决方法
您可以使用 RecyclerView 的滚动状态，它们是：
可以在以下位置找到有关状态的更多详细信息： https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView
状态 1：
SCROLL_STATE_DRAGGING :
The RecyclerView is currently being dragged by outside input such as user touch input.
状态 2：
SCROLL_STATE_IDLE
The RecyclerView is not currently scrolling.
状态 3：
SCROLL_STATE_SETTLING
The RecyclerView is currently animating to a final position while not under outside control.
使用这些滚动状态并基于它做你的动画。 我能想到两种方法：
方法一：
Either perform your animation only when the Scroll State is at Idle as per State 2
方法二：
Set focus of recyclerview to off state when the RecyclerView is being dragged as per State 1