Method startDrag

Starts a drag. @param v The view that is being dragged @param bmp The bitmap that represents the view being dragged @param source An object representing where the drag originated @param dragInfo The data associated with the object that is being dragged @param dragAction The drag action: either {@li

(View v, Bitmap bmp, DragSource source, Object dragInfo, int dragAction,
            Point extraPadding, float initialDragViewScale)