[我正在Kotlin中制作旋转动画,我想在每个动画之后设置一个net rotationStart和rotationEnd,其中初始应将rotationStart值设置为0,然后在每次旋转后均采用rotationEnd值的值
val rand = Random()
var rotStart : Float = 0f
var rotEnd : Float = rand.nextFloat(100f)
像这样设置轮播:
var rotateAnimation = RotateAnimation(
rotStart, rotEnd,
Animation.RELATIVE_TO_SELF, 0.5f,
Animation.RELATIVE_TO_SELF, 0.5f
)
rotateAnimation.duration = 4000
rotateAnimation.repeatCount = 4
与听众:
rotateAnimation.setAnimationListener(object : Animation.AnimationListener {
override fun onAnimationStart(animation: Animation?) {
}
override fun onAnimationRepeat(animation: Animation?) {
rotStart = rotEnd
rotEnd = rand.nextFloat(359f)
}
override fun onAnimationEnd(animation: Animation?) {
}
})
img_spinner.startAnimation(rotateAnimation)
}
这里的问题是,值rotStart和rotEnd在每个周期后都不会更新。我忘记实现了onUpdateListener吗?
val angles = arrayOf(9,6,9,4)
var rotStart = 0f
var imageSpinner = findViewById<ImageView>(R.id.img_spinner)
val ra1 = RotateAnimation(rotStart,-angles[0].toFloat() * 39, Animation.RELATIVE_TO_SELF, 0.5f,
Animation.RELATIVE_TO_SELF, 0.5f)
ra1.duration = 3200
val ra2 = RotateAnimation(rotStart, -angles[1].toFloat() * 39, Animation.RELATIVE_TO_SELF, 0.5f,
Animation.RELATIVE_TO_SELF, 0.5f)
ra2.duration = 1900
val ra3 = RotateAnimation(rotStart, -angles[2].toFloat() * 39, Animation.RELATIVE_TO_SELF, 0.5f,
Animation.RELATIVE_TO_SELF, 0.5f)
ra3.duration = 5400
val ra4 = RotateAnimation(rotStart, -angles[3].toFloat() * 39, Animation.RELATIVE_TO_SELF, 0.5f,
Animation.RELATIVE_TO_SELF, 0.5f)
ra4.duration = 5400
此后,您必须在每个onAnimationEnd上进行设置:imageview.startAnimation(ra#NUMBER#)。这是一种解决方法,而不是干净的解决方案:-)