android - Problem implementing vertical swipe in Gallery -

i asked similar question in android developers group haven't received response yet, figured i'd try luck here.

i want implement vertical swipe on gallery , have working... sort of. subclassed gallery override onfling , ondown methods.

here code used override these methods:

@override public boolean onfling(motionevent e1, motionevent e2, float velocityx, float velocityy) {     if (m_curtouchpos == no_current_touch_pos || m_callback == null)         return super.onfling(e1, e2, velocityx, velocityy);      float e1x = e1.getx();     float e1y = e1.gety();     float e2x = e2.getx();     float e2y = e2.gety();      float offpath = math.abs(e1x - e2x);     float distance = math.abs(e1y - e2y);      if (offpath < s_swipemaxoffpath &&          //math.abs(velocityy) >= s_swipeminvelocity &&          distance >= s_swipemindistance)     {         if (e1y > e2y)         {             m_callback.onswipeup(m_curtouchpos);             //return true;         }         else if (e2y > e1y)         {             //todo: implement             //m_callback.onswipedown(m_curtouchpos);             //return true;         }     }      m_curtouchpos = no_current_touch_pos;     return super.onfling(e1, e2, velocityx, velocityy); }  @override public boolean ondown(motionevent eve) {     m_curtouchpos = pointtoposition((int)eve.getx(), (int)eve.gety());     return super.ondown(eve); } 

the problem onfling doesn't called when vertical swipe... in order onfling method have press on item in gallery, slide little left or right, , swipe vertically.

horizontal swipes onfling method.

any ideas on how work?

ok, have found answer... ondown() method needs return true. call return super.ondown(eve) causing fail because default implementation returns false.

i found answer in post here on stackoverflow:

android: gesturedetector not working (gesturedetector.ontouchevent(event) false) tabs (tabactivity, tabwidget)