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  • Viewpager切换效果

    viewpager.setPageTransformer(true, new ZoomOutPageTransformer());

    //第一个为Boolean类型的值,第二个是实现类

    下面为两个切换方式,后面切换出来和 变浅效果

    	
    import android.support.v4.view.ViewPager.PageTransformer;
    import android.view.View;
    
    public class DepthPageTransformer implements PageTransformer {
        private static float MIN_SCALE = 0.75f;
                              
        @Override
        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);
                              
            }
        }                        
    }
    

     第二种

    import android.support.v4.view.ViewPager.PageTransformer;
    import android.view.View;
    
    public class ZoomOutPageTransformer implements PageTransformer {
        private static float MIN_SCALE = 0.85f;
                      
        private static float MIN_ALPHA = 0.5f;
                      
        @Override
        public void transformPage(View view, float position) {
            int pageWidth = view.getWidth();
            int pageHeight = view.getHeight();
                      
            if (position < -1) { // [-Infinity,-1)
                                    // This page is way off-screen to the left.
                view.setAlpha(0);
            } else if (position <= 1) { // [-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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  • 原文地址:https://www.cnblogs.com/lyxin/p/5699671.html
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