java - Horizontal scroll view scrolling one item at time -


i implementing panel include horizontal list view using horizontal scroll view . in need control scrolling of horizontal scroll view , scrolling 1 item @ time.

could 1 give me idea kind of thing.

i manged using overriding horizontalscrollview , merging code got various internet examples .it working fine .

i have used gesturedetector , onfling method achieve task.

public void setcenter(int index) {      viewgroup parent = (viewgroup) getchildat(0);      view preview = parent.getchildat(previndex);     //preview.setbackgroundcolor(color.parsecolor("#64cbd8"));     android.widget.linearlayout.layoutparams lp = new linearlayout.layoutparams(             linearlayout.layoutparams.wrap_content,             linearlayout.layoutparams.wrap_content);     lp.setmargins(5, 0, 5, 0);     preview.setlayoutparams(lp);      view view = parent.getchildat(index);     //view.setbackgroundcolor(color.red);      int screenwidth = ((activity) context).getwindowmanager()             .getdefaultdisplay().getwidth();      int scrollx = (view.getleft() - (screenwidth / 2))             + (view.getwidth() / 2);     this.smoothscrollto(scrollx, 0);     previndex = index;     log.d("item", string.valueof(previndex)); }  @override public boolean ondown(motionevent e) {     // todo auto-generated method stub     return false; }  @override public boolean onfling(motionevent e1, motionevent e2, float velocityx,         float velocityy) {     if (flingdisable)         return false;     boolean returnvalue = false;     float ptx1 = 0, ptx2 = 0;     if (e1 == null || e2 == null)         return false;     ptx1 = e1.getx();     ptx2 = e2.getx();     // right left      if (ptx1 - ptx2 > swipe_min_distance             && math.abs(velocityx) > swipe_threshold_velocity) {         if (activeitem < maxitem - 1)             activeitem = activeitem + 1;          returnvalue = true;      } else if (ptx2 - ptx1 > swipe_min_distance             && math.abs(velocityx) > swipe_threshold_velocity) {         if (activeitem > 0)             activeitem = activeitem - 1;          returnvalue = true;     }     //scrollto = activeitem * itemwidth;     //this.smoothscrollto(0, scrollto);     setcenter(activeitem);     return returnvalue; }    @override public boolean ontouch(view v, motionevent event) {     if (gesturedetector.ontouchevent(event)) {         return true;     }     boolean returnvalue = gesturedetector.ontouchevent(event);      int x = (int) event.getrawx();      switch (event.getaction()) {     case motionevent.action_move:         if (start) {             this.prevscrollx = x;             start = false;         }         break;     case motionevent.action_up:         start = true;         this.currentscrollx = x;         int minfactor = itemwidth / swipe_page_on_factor;          if ((this.prevscrollx - this.currentscrollx) > minfactor) {             if (activeitem < maxitem - 1)                 activeitem = activeitem + 1;          } else if ((this.currentscrollx - this.prevscrollx) > minfactor) {             if (activeitem > 0)                 activeitem = activeitem - 1;         }         log.d("item", string.valueof(activeitem));         setcenter(activeitem);         returnvalue = true;         break;     }     return returnvalue; }

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