Android官方提供的两种viewpager滑动动画

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1.ZoomOutPageTransformer

package com.gelonghui.glhapp.view;import android.view.View;public class ZoomOutPageTransformer implements android.support.v4.view.ViewPager.PageTransformer {    private static float MIN_SCALE = 0.85f;    private static float MIN_ALPHA = 0.5f;    public void transformPage(View view, float position) {        int pageWidth = view.getWidth();        int pageHeight = view.getHeight();        if (position < -1) { // [-Infinity,-1)            // 这个页面正在向左远离屏幕            view.setAlpha(0);        } else if (position <= 1) { // [-1,1]            // 修改默认幻灯片动画，缩小页面            float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));            float vertMargin = pageHeight * (1 - scaleFactor) / 2;            float horzMargin = pageWidth * (1 - scaleFactor) / 2;            if (position < 0) {                view.setTranslationX(horzMargin - vertMargin / 2);            } else {                view.setTranslationX(-horzMargin + vertMargin / 2);            }            // 按比例缩小页面(比例在 MIN_SCALE 和 1之间)            view.setScaleX(scaleFactor);            view.setScaleY(scaleFactor);            // 相对于其尺寸进行渐隐            view.setAlpha(MIN_ALPHA +                    (scaleFactor - MIN_SCALE) /                    (1 - MIN_SCALE) * (1 - MIN_ALPHA));        } else { // (1,+Infinity]            // 该页面正在向右远离屏幕            view.setAlpha(0);        }    }}

2.DepthPageTransformer

package com.gelonghui.glhapp.view;import android.view.View;public class DepthPageTransformer implements android.support.v4.view.ViewPager.PageTransformer {    private static float MIN_SCALE = 0.75f;    public void transformPage(View view, float position) {        int pageWidth = view.getWidth();        if (position < -1) { // [-Infinity,-1)            // 页面正在向左离开屏幕            view.setAlpha(0);        } else if (position <= 0) { // [-1,0]            // 使用正常的滑动效果，            view.setAlpha(1);            view.setTranslationX(0);            view.setScaleX(1);            view.setScaleY(1);        } else if (position <= 1) { // (0,1]            // 渐隐            view.setAlpha(1 - position);            // 抵消默认的滑动            view.setTranslationX(pageWidth * -position);            // 按比例缩小图片            float scaleFactor = MIN_SCALE                    + (1 - MIN_SCALE) * (1 - Math.abs(position));            view.setScaleX(scaleFactor);            view.setScaleY(scaleFactor);        } else { // (1,+Infinity]            // 页面向右离开屏幕            view.setAlpha(0);        }    }}3.mViewPager.setPageTransformer(true, new DepthPageTransformer());

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