Android - How to use DragShadowBuilder? -

i using dragshadowbuilder.java, class sample.

i don't know how can use in activity, parameters should send constructor of drawabledragshadowbuilder:

public class drawabledragshadowbuilder extends dragshadowbuilder {     private drawable mdrawable;      public drawabledragshadowbuilder(view view, drawable drawable) {         super(view);         // set drawable , apply green filter         mdrawable = drawable;         mdrawable.setcolorfilter(new porterduffcolorfilter(color.green, porterduff.mode.multiply));     }      @override     public void onprovideshadowmetrics(point shadowsize, point touchpoint) {         // fill in size         shadowsize.x = mdrawable.getintrinsicwidth();         shadowsize.y = mdrawable.getintrinsicheight();         // fill in location of shadow relative touch.         // here center shadow under finger.         touchpoint.x = mdrawable.getintrinsicwidth() / 2;         touchpoint.y = mdrawable.getintrinsicheight() / 2;          mdrawable.setbounds(new rect(0, 0, shadowsize.x, shadowsize.y));     }      @override     public void ondrawshadow(canvas canvas) {         //draw shadow view onto provided canvas         mdrawable.draw(canvas);     } } 

thank's lot.

you have pass view want drag, in constructor of dragshadowbuilder

dragshadowbuilder shadowbuilder = new view.dragshadowbuilder(view); 

and start drag using:

view.startdrag(data, shadowbuilder, view, 0); 

here complete example following excellent tutorial:

import android.app.activity; import android.content.clipdata; import android.graphics.drawable.drawable; import android.os.bundle; import android.view.dragevent; import android.view.motionevent; import android.view.view; import android.view.view.dragshadowbuilder; import android.view.view.ondraglistener; import android.view.view.ontouchlistener; import android.view.viewgroup; import android.widget.linearlayout;  public class myactivity extends activity {    @override public void oncreate(bundle savedinstancestate) {  super.oncreate(savedinstancestate);  setcontentview(r.layout.main);   findviewbyid(r.id.myimage1).setontouchlistener(new mytouchlistener());  findviewbyid(r.id.myimage2).setontouchlistener(new mytouchlistener());  findviewbyid(r.id.myimage3).setontouchlistener(new mytouchlistener());  findviewbyid(r.id.myimage4).setontouchlistener(new mytouchlistener());  findviewbyid(r.id.topleft).setondraglistener(new mydraglistener());  findviewbyid(r.id.topright).setondraglistener(new mydraglistener());  findviewbyid(r.id.bottomleft).setondraglistener(new mydraglistener());  findviewbyid(r.id.bottomright).setondraglistener(new mydraglistener());   }  private final class mytouchlistener implements ontouchlistener { public boolean ontouch(view view, motionevent motionevent) {   if (motionevent.getaction() == motionevent.action_down) {     clipdata data = clipdata.newplaintext("", "");     dragshadowbuilder shadowbuilder = new view.dragshadowbuilder(view);     view.startdrag(data, shadowbuilder, view, 0);     view.setvisibility(view.invisible);     return true;    } else {     return false;    }  } }   class mydraglistener implements ondraglistener { drawable entershape = getresources().getdrawable(r.drawable.shape_droptarget); drawable normalshape = getresources().getdrawable(r.drawable.shape);  @override public boolean ondrag(view v, dragevent event) {   int action = event.getaction();   switch (event.getaction()) {   case dragevent.action_drag_started:     // nothing     break;   case dragevent.action_drag_entered:     v.setbackgrounddrawable(entershape);     break;   case dragevent.action_drag_exited:     v.setbackgrounddrawable(normalshape);     break;   case dragevent.action_drop:     // dropped, reassign view viewgroup     view view = (view) event.getlocalstate();     viewgroup owner = (viewgroup) view.getparent();     owner.removeview(view);     linearlayout container = (linearlayout) v;     container.addview(view);     view.setvisibility(view.visible);     break;   case dragevent.action_drag_ended:     v.setbackgrounddrawable(normalshape);   default:     break;     }   return true;   }  } }