app/src/main/java/me/zhanghai/android/douya/ui/ViewPagerTransformers.java

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/*
 * Copyright (c) 2015 Zhang Hai <Dreaming.in.Code.ZH@Gmail.com>
 * All Rights Reserved.
 */

package me.zhanghai.android.douya.ui;

import android.support.v4.view.ViewPager;
import android.view.View;

public class ViewPagerTransformers {

    private ViewPagerTransformers() {}

    public static class Depth implements ViewPager.PageTransformer {

        private static final float MIN_SCALE = 0.75f;

        public void transformPage(View view, float position) {

            int pageWidth = view.getWidth();

            if (position < -1) { // [-Infinity,-1)

                // This page is way off-screen to the left.
                view.setAlpha(0);

            } else if (position <= 0) { // [-1,0]

                // Use the default slide transition when moving to the left page
                view.setAlpha(1);
                view.setTranslationX(0);
                view.setScaleX(1);
                view.setScaleY(1);

            } else if (position <= 1) { // (0,1]

                // Fade the page out.
                view.setAlpha(1 - position);

                // Counteract the default slide transition
                view.setTranslationX(pageWidth * -position);

                // Scale the page down (between MIN_SCALE and 1)
                float scaleFactor = MIN_SCALE
                        + (1 - MIN_SCALE) * (1 - Math.abs(position));
                view.setScaleX(scaleFactor);
                view.setScaleY(scaleFactor);

            } else { // (1,+Infinity]

                // This page is way off-screen to the right.
                view.setAlpha(0);
            }
        }
    }

    public static class ZoomOut implements ViewPager.PageTransformer {

        private static final float MIN_SCALE = 0.85f;