Android Question Widget on screen

hostView.setOnDragListener(new 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:
                // do 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 to ViewGroup
                View view = (View) event.getLocalState();
                ViewGroup owner = (ViewGroup) view.getParent();
                owner.removeView(view);
                GridLayout container = (GridLayout) v;
                container.addView(view);
                view.setVisibility(View.VISIBLE);
                break;
              case DragEvent.ACTION_DRAG_ENDED:
                v.setBackgroundDrawable(normalShape);
              default:
                break;
              }
              return true;
        }
    });