phileo

class DepthPageTransformer: ViewPager.PageTransformer {
    companion object {
        private const val MIN_SCALE = 0.75f
    }

    override fun transformPage(view: View, position: Float) {
        when {
            position < -1 -> // [-Infinity,-1)
                // This page is way off-screen to the left.
                view.alpha = 0f

phileo

class ZoomPageTransformer: ViewPager.PageTransformer {
    companion object {
        private const val MIN_SCALE = 0.85f
        private const val MIN_ALPHA = 0.5f
    }

    override fun transformPage(view: View, position: Float) {
        val pageWidth = view.width
        val pageHeight = view.height

phileo

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/media02_001" android:duration="25"/>
    <item android:drawable="@drawable/media02_002" android:duration="25"/>
    <item android:drawable="@drawable/media02_003" android:duration="25"/>
    <item android:drawable="@drawable/media02_004" android:duration="25"/>
    <item android:drawable="@drawable/media02_005" android:duration="25"/>
    <item android:drawable="@drawable/media02_006" android:duration="25"/>
    <item android:drawable="@drawable/media02_007" android:duration="25"/>