IMarketBillingService do not created. Android 3.0

I want to implement In-app Billing app

Have some problems with IMarketBillingService.java-file creating.

I do these steps:

Create the following directory in your application's /src directory: com/android/vending/billing/

Copy the IMarketBillingService.aidl file into the sample/src/com/android/vending/billing/ directory.

Build your application.

But in /gen I can not find a generated interface file. I use Android 3.0..

When I ad开发者_开发百科d IMarketBillingService.aidl to project with API 8 -- all is ok.. IMarketBillingService.java is creating..

any suggestions?