解决ViewPager在ScrollView中失效的问题

public class VerticalScrollView extends ScrollView {
 
    private GestureDetector mGestureDetector;
 
    public VerticalScrollView(Context context, AttributeSet attrs){
        super(context, attrs);
        mGestureDetector = new GestureDetector(context, new YScrollDetector());
    }
 
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        return super.onInterceptTouchEvent(ev) && mGestureDetector.onTouchEvent(ev);
    }
 
    class YScrollDetector extends SimpleOnGestureListener {
 
        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
            /**
             * if we're scrolling more closer to x direction, return false, let subview to process it
             */
            return (Math.abs(distanceY) > Math.abs(distanceX));
        }
    }
}