Android application crashs when i drop item into gridview -

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i try drag , drop item between grid view, item correctly dragged when in action application crashs. code 

 case dragevent.action_drop:                      passobject passobj = (passobject)event.getlocalstate();                     view view = passobj.view;                     artifact passeditem = passobj.artifact;                     list<artifact> srclist = passobj.srclist;                     abslistview oldparent = (abslistview)view.getparent();                     artifactadapter srcadapter = (artifactadapter) oldparent.getadapter();                      linearlayoutabslistview newparent = (linearlayoutabslistview)v;                     artifactadapter destadapter = (artifactadapter)(newparent.abslistview.getadapter());                     list<artifact> destlist = destadapter.getlist();                      if(removeitemtolist(srclist, passeditem)){                         additemtolist(destlist, passeditem);                     }                      srcadapter.notifydatasetchanged();                     destadapter.notifydatasetchanged();                      //smooth scroll bottom                     newparent.abslistview.smoothscrolltoposition(destadapter.getcount()-1);                      break;                 case dragevent.action_drag_ended:                 default:                     break;

the problem in line 

artifactadapter destadapter = (artifactadapter)(newparent.abslistview.getadapter());

any appreciated !!


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