cont..

1.commons of 2d-3d all uses surface
2.difference 2d uses canvas over surface,3d uses glcontext over surface
3.z ordering of layers which is near to screen .... not surfaces
4.stack based implementation get the appropriate layer using push restore ...not surface
5.EGL has some query interface, activity tells the requirement, EGL selects the appropriate channel ......based on parameters .... but canvas drawing and gldrawing are entirely different
6.the view hierarchy helps to localize the area where either canvas or gldrawing is applied
7.Layout inflator is used only for xml
8.ViewRoot
9.