旋转动画期间更新属性

问题描述 投票:0回答:1

[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?

xml animation kotlin rotation android-animation
1个回答
0
投票
嗯,到目前为止,我发现的唯一方法是在这里(以防万一没有人回答这个问题,这是我的解决方法)

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:-)
© www.soinside.com 2019 - 2024. All rights reserved.