Android中使用PropertyValuesHolder 和Keyframe建立抖動動畫
PropertyValuesHolder儲存了view的屬性的資訊以及在動畫進行過程中該屬性的值。
通過PropertyValuesHolder.ofKeyframe方法來建構改方法接收一個屬性名以及多個Keyframe對象作為參數。可以通過PropertyValuesHolder改變多個屬性。
使用
jitter(view,1f)
private fun jitter(view: View, shakeFactor: Float){
var pvhScaleX = PropertyValuesHolder.ofKeyframe(
View.SCALE_X,
Keyframe.ofFloat(0f, 1f),
Keyframe.ofFloat(.1f, .9f),
Keyframe.ofFloat(.2f, .9f),
Keyframe.ofFloat(.3f, 1.1f),
Keyframe.ofFloat(.4f, 1.1f),
Keyframe.ofFloat(.5f, 1.1f),
Keyframe.ofFloat(.6f, 1.1f),
Keyframe.ofFloat(.7f, 1.1f),
Keyframe.ofFloat(.8f, 1.1f),
Keyframe.ofFloat(.9f, 1.1f),
Keyframe.ofFloat(1f, 1f)
)
var pvhScaleY = PropertyValuesHolder.ofKeyframe(
View.SCALE_Y,
Keyframe.ofFloat(0f, 1f),
Keyframe.ofFloat(.1f, .9f),
Keyframe.ofFloat(.2f, .9f),
Keyframe.ofFloat(.3f, 1.1f),
Keyframe.ofFloat(.4f, 1.1f),
Keyframe.ofFloat(.5f, 1.1f),
Keyframe.ofFloat(.6f, 1.1f),
Keyframe.ofFloat(.7f, 1.1f),
Keyframe.ofFloat(.8f, 1.1f),
Keyframe.ofFloat(.9f, 1.1f),
Keyframe.ofFloat(1f, 1f)
)
var pvhRotate = PropertyValuesHolder.ofKeyframe(
View.ROTATION,
Keyframe.ofFloat(0f, 0f),
Keyframe.ofFloat(.1f, -3f * shakeFactor),
Keyframe.ofFloat(.2f, -3f * shakeFactor),
Keyframe.ofFloat(.3f, 3f * shakeFactor),
Keyframe.ofFloat(.4f, -3f * shakeFactor),
Keyframe.ofFloat(.5f, 3f * shakeFactor),
Keyframe.ofFloat(.6f, -3f * shakeFactor),
Keyframe.ofFloat(.7f, 3f * shakeFactor),
Keyframe.ofFloat(.8f, -3f * shakeFactor),
Keyframe.ofFloat(.9f, 3f * shakeFactor),
Keyframe.ofFloat(1f, 0f)
)
var animator = ObjectAnimator.ofPropertyValuesHolder(view, pvhScaleX, pvhScaleY, pvhRotate).setDuration(1000)
animator.repeatCount = ValueAnimator.INFINITE
animator.start()
}