仿抖音上下滑动分页视频，面试字节跳动被问Android屏幕适配方案

/**

*/ public class VerticalViewPager extends ViewPager {

private boolean isVertical = false; private long mRecentTouchTime;

public VerticalViewPager(@NonNull Context context) { super(context); }

public VerticalViewPager(@NonNull Context context, @Nullable AttributeSet attrs) { super(context, attrs); }

private void init() { setPageTransformer(true, new HorizontalVerticalPageTransformer()); setOverScrollMode(OVER_SCROLL_NEVER); }

public boolean isVertical() { return isVertical; }

public void setVertical(boolean vertical) { isVertical = vertical; init(); }

private class HorizontalVerticalPageTransformer implements PageTransformer {

private static final float MIN_SCALE = 0.25f;

@Override public void transformPage(@NonNull View page, float position) { if (isVertical) { if (position < -1) { page.setAlpha(0); } else if (position page.setAlpha(0); } } else { int pageWidth = page.getWidth(); if (position < -1) { // [-Infinity,-1) // This page is way off-screen to the left. page.setAlpha(0); } else if (position mRecentTouchTime = System.currentTimeMillis(); if (getCurrentItem() == 0 && getChildCount() == 0) {