Hi Tomson,
If you're accessing web tiled layer you can use 10.2.3: AGSWebTiledLayer Class Reference
It allows you to pull in tiled layer by providing correct URL template.
In your case that would be:
http://mt{subDomain}.google.cn/vt/v=w2.114&hl=zh-CN&gl=cn&x={col}&y={row}&z={level}&s=
Regards,
David