drag and drop - Layout flicker when dragging view in its MotionEvent.ACTION_MOVE android -

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here picture of i'm trying do:

enter image description here

so, want resize single cell while dragging resize anchors (black quads) imageviews. attached custom ontouchlistener them next in motionevent.action_move:

  • calculate drag offset
  • set cell height/width based on offset
  • reposition anchor point changing it's layout params

the outcome of cell resizes there king of flicker, more shaking left/right or up/down, small offset.

my guess problem comes when catches move event, manualy change position of anchor , then, when catches move event again doesn't handle change well...or something

i have idea put invisible imageviews under each anchor , resize based on movement not move anchor while draging. when relese it, lines coresponding visible anchor. more hacking solution :)

and finally, anubody know why happening?

edit: here code i'm handlign move event:

float dragy = event.getrawy() - resizepreviouspositiony;                      linearlayout.layoutparams componentparams = (linearlayout.layoutparams)selectedcomponent.layout.getlayoutparams();                     linearlayout parrent = (linearlayout)selectedcomponent.layout.getparent();                     view topsibling = parrent.getchildat(parrent.indexofchild(selectedcomponent.layout) - 1);                     linearlayout.layoutparams topsiblingparams = (linearlayout.layoutparams)topsibling.getlayoutparams();                      if(dragy > 0 && selectedcomponent.layout.getheight() > 100 ||                             dragy < 0 &&  topsibling.getheight() > 100)                     {                         componentparams.height = selectedcomponent.layout.getheight() - (int)dragy;                         topsiblingparams.height = topsibling.getheight() + (int)dragy;                         //bottomsiblingparams.height = bottomsibling.getheight();                         selectedcomponent.layout.setlayoutparams(componentparams);                          repositionresizeanchors(selectedcomponent);                     }                     resizepreviouspositiony = event.getrawy();

and here reposition it:

if(((linearlayout)viewholder.layout.getparent()).getorientation() == linearlayout.vertical)         {             leftmargin = ((linearlayout)viewholder.layout.getparent()).getleft() +                      viewholder.layout.getleft() + viewholder.layout.getwidth()/2;         }         else         {             leftmargin = viewholder.layout.getleft() + viewholder.layout.getwidth()/2;         }         topmargin = viewholder.layout.gettop();         params = (relativelayout.layoutparams)resizetop.getlayoutparams();         params.leftmargin = leftmargin - dptopx(resizeanchorradius/2);         params.topmargin = topmargin - dptopx(resizeanchorradius/2);         resizetop.setlayoutparams(params);


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