question: public void stop ( ) { if ( sLogger . isActivated ( ) ) { sLogger . info ( "Stop address book monitoring" ) ; } mCheckHandler . removeMessages ( CHECK_MESSAGE ) ; if ( mObserverIsRegistered ) { mContactsContractCursor . unregisterContentObserver ( mContactsContractObserver ) ; mObserverIsRegistered = false ; mContactsContractCursor . close ( ) ; } mCleanupExecutor . shutdownNow ( ) ; }
target:  Stop address book monitoring