ViewPager的两种切换效果

来源：互联网发布：淘宝刷销量怎么刷编辑：程序博客网时间：2024/06/07 10:21

用法: babyrecipe_vp.setPageTransformer(true, new DepthPageTransformer());// babyrecipe_vp.setPageTransformer(true, new ZoomOutPageTransformer());        两个类分别如下：

import android.view.View;/** * ViewPager切换效果1 * * @author liubo * */public class DepthPageTransformer implements android.support.v4.view.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);        }    }}

import android.annotation.SuppressLint;        import android.support.v4.view.ViewPager;        import android.util.Log;        import android.view.View;/** * ViewPager切换动画2 * * @author liubo * */public class ZoomOutPageTransformer implements ViewPager.PageTransformer {    private static final float MIN_SCALE = 0.85f;    private static final float MIN_ALPHA = 0.5f;    @SuppressLint("NewApi")    public void transformPage(View view, float position) {        int pageWidth = view.getWidth();        int pageHeight = view.getHeight();        Log.e("TAG", view + " , " + position + "");        if (position < -1) { // [-Infinity,-1)            // This page is way off-screen to the left.            view.setAlpha(0);        } else if (position <= 1) // a页滑动至b页 ； a页从 0.0 -1 ；b页从1 ~ 0.0        { // [-1,1]            // Modify the default slide transition to shrink the page as well            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);            }            // Scale the page down (between MIN_SCALE and 1)            view.setScaleX(scaleFactor);            view.setScaleY(scaleFactor);            // Fade the page relative to its size.            view.setAlpha(MIN_ALPHA + (scaleFactor - MIN_SCALE) / (1 - MIN_SCALE) * (1 - MIN_ALPHA));        } else { // (1,+Infinity]            // This page is way off-screen to the right.            view.setAlpha(0);        }    }}

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