public class CustomScrollView extends ScrollView {    private GestureDetector mGestureDetector;    View.OnTouchListener mGestureListener;    public CustomScrollView(Context context, AttributeSet attrs) {        super(context, attrs);        mGestureDetector = new GestureDetector(context, new YScrollDetector());        setFadingEdgeLength(0);    }    @Override    public boolean onInterceptTouchEvent(MotionEvent ev) {        return super.onInterceptTouchEvent(ev) && mGestureDetector.onTouchEvent(ev);    }    // Return false if we‘re scrolling in the x direction      class YScrollDetector extends SimpleOnGestureListener {        @Override        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {                         return Math.abs(distanceY) > Math.abs(distanceX);        }    }}

public class VerticalScrollView extends ScrollView {private float xDistance, yDistance, lastX, lastY;public VerticalScrollView(Context context, AttributeSet attrs) {    super(context, attrs);}@Overridepublic boolean onInterceptTouchEvent(MotionEvent ev) {    switch (ev.getAction()) {        case MotionEvent.ACTION_DOWN:            xDistance = yDistance = 0f;            lastX = ev.getX();            lastY = ev.getY();            break;        case MotionEvent.ACTION_MOVE:            final float curX = ev.getX();            final float curY = ev.getY();            xDistance += Math.abs(curX - lastX);            yDistance += Math.abs(curY - lastY);            lastX = curX;            lastY = curY;            if(xDistance > yDistance)                return false;    }    return super.onInterceptTouchEvent(ev);}}