any intent you make to a service, activity etc. in your app should always follow this format
Intent serviceIntent = new Intent(context,MyService.class);
context.startService(serviceIntent);
or
Intent bi = new Intent("com.android.vending.billing.InAppBillingService.BIND");
bi.setPackage("com.android.vending");
implicit intents (what you have in your code currently) are considered a security risk