如何在viewpager中实现垂直堆栈转换器

Question

在垂直viewpager中，当垂直当前屏幕中的滑动移动到左侧但我必须在第一个视图上移动我的第二个视图（即）第一个视图应该适合屏幕。我已经实现了垂直堆叠变换器但是它不适合我。你能帮助我解决这个问题。

提前致谢。

这是我用过的viewpager。

public class VerticalViewPager extends ViewPager {

public VerticalViewPager(Context context) {
    super(context);
    init();
}

public VerticalViewPager(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
}

private void init() {

    setPageTransformer(true, new VerticalPageTransformer());

    setOverScrollMode(OVER_SCROLL_NEVER);
}

private class VerticalPageTransformer implements ViewPager.PageTransformer {

    @Override
    public void transformPage(View view, float position) {

            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]

               // Counteract the default slide transition
            view.setTranslationY(position < 0 ? 0f : -view.getHeight() * position);

            } else { // (1,+Infinity]
                // This page is way off-screen to the right.
                view.setAlpha(0);
            }

}

/**
 * Swaps the X and Y coordinates of your touch event.
 */
private MotionEvent swapXY(MotionEvent ev) {
    float width = getWidth();
    float height = getHeight();

    float newX = (ev.getY() / height) * width;
    float newY = (ev.getX() / width) * height;

    ev.setLocation(newX, newY);

    return ev;
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    try {
        boolean intercepted = super.onInterceptTouchEvent(swapXY(ev));
        swapXY(ev); // return touch coordinates to original reference frame for any child views
        return intercepted;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return false;
}

@Override
public boolean onTouchEvent(MotionEvent ev) {
    return super.onTouchEvent(swapXY(ev));
}
}

这是我修改过的代码。

@Override
public void transformPage(View view, float position) {
            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]

               // Counteract the default slide transition
                view.setTranslationY(position < 0 ? 0f : -view.getHeight() * position);

            } else { // (1,+Infinity]
                // This page is way off-screen to the right.
                view.setAlpha(0);
            } 
}