GOOGlE API V2 issue in android 2.2

view story

http://stackoverflow.com – i want to use google api v2 in android 2.2. i am already done all pre-requisite requirement for it. like: Google map api key. android-support-v4.jar google-play-services_lib.jar google-play-services.jar i get this error. 02-26 09:32:04.055: E/AndroidRuntime(334): FATAL EXCEPTION: main 02-26 09:32:04.055: E/AndroidRuntime(334): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.mapfragment/com.mapfragment.MainActivity}: java.lang.ClassNotFoundException: com.mapfragment.MainActivity in loader dalvik.system.PathClassLoader[/system/framework/com.google.android.maps (HowTos)