短视频代码，自定义叠加动画实现的相关代码
package im.zebra.myviewpager2
import android.view.View
import androidx.viewpager2.widget.ViewPager2
import kotlin.math.abs
private const val MIN_SCALE = 1f
class ViewPagerOverlay : ViewPager2.PageTransformer {
override fun transformPage(view: View, position: Float) {
val pageWidth = view.width
when {
position < -1 -> { // [-Infinity,-1)
// This page is way off-screen to the left.
view.alpha = 0f
}
position <= 0 -> { // [-1,0]
// Use the default slide transition when moving to the left page
view.alpha = 1F
view.translationX = 0f
view.scaleX = 1f
view.scaleY = 1f
}
position <= 1 -> { // (0,1]
// Fade the page out.
view.alpha = 1 - position
// Counteract the default slide transition
view.translationX = pageWidth * -position
// Scale the page down (between MIN_SCALE and 1)
val scaleFactor: Float = (MIN_SCALE
(1 - MIN_SCALE) * (1 - abs(position)))
view.scaleX = scaleFactor
view.scaleY = scaleFactor
}
else -> { // (1, Infinity]
// This page is way off-screen to the right.
view.alpha = 0f
}
}
}
}以上就是 短视频代码，自定义叠加动画实现的相关代码，更多内容欢迎关注之后的文章
