If you have Android Apps with admob, and you update admob API with current ADT (may be ADT-17 or later), may be your code can be compiled without error, but fail in run-time, caused by java.lang.NoClassDefFoundError: com.google.ads.AdView!
It seem to be problem in ADT with external jars. To solve it:
- Create a libs folder in your project.
- Copy AdMob jar, GoogleAdMobAdsSdk-6.0.1.jar, in the libs folder.
- Update Java Build Path by selecting "Add JARs..." (NOT "Add External JARs...") to add the jar in libs.