效果如下所示:
思路:
a.利用ViewPager自带的动画效果,略作修改,实现滑动覆盖翻页效果。
b.移动时加入阴影效果。
1.关键代码如下所示:
public class ReaderViewPager extends ViewPager { public ReaderViewPager(Context context) { this(context, null); } public ReaderViewPager(Context context, AttributeSet attrs) { super(context, attrs); setReadEffect(); setScrollerDuration(); } private void setScrollerDuration() { try { Field field = ViewPager.class.getDeclaredField("mScroller"); field.setAccessible(true); FixedSpeedScroller scroller = new FixedSpeedScroller(getContext(), new DecelerateInterpolator()); field.set(this, scroller); scroller.setmDuration(300); } catch (Exception e) { Log.e("@", "", e); } } public void setReadEffect() { setPageTransformer(true, new PageTransformer() { private static final float MIN_SCALE = 0.75f; @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 <= 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.setAlpha(1); 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); } } }); } }
2.阴影效果添加(其实阴影是一张图片,本来是要在ReadViewPager内部添加阴影效果,但是不显示,貌似被ReadViewPage自己遮住了,就用笨办法实现了^_^):
3.阴影随翻页而移动效果实现
readerViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { shadowView.setTranslationX(readerViewPager.getWidth()-positionOffsetPixels); } @Override public void onPageSelected(int position) { } @Override public void onPageScrollStateChanged(int state) { } });
4.OK,就是这么简单,快去做一个自己的驾考宝典吧 。。。
5.我自己写了一些简单的实现方法,有3个View的实现方式,还有其他使用开源控件实现的,这是地址,欢迎提意见哦
GitHub项目demo地址
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