Today i was update my android sdk to new android adk-17 . i am facing some problems in this, that is unable to show AddMob in my app, if i remove addmob in the code able to
Maybe the ADK update has messed-up with your project's build-path.
Try removing the admob JAR and add it again to your libs
folder, add it to your Build Path and do a Clean Project.
Anyway it's hard to help you without more details on the error you encounter.
EDIT following poster's comment about not having a libs
folder:
You should try this:
libs
folder at the root of your projectlibs
folder