Hi,
My own way is to add an item to disable/enable ACRA from my app's preferences:
This way, you can enable/disable ACRA from the app in your AVD and the setting is kept through updates unless you uninstall completely your app before reinstalling.
You could also simply check the value of android.os.Build.PRODUCT before the call to ACRA.init(). If the value is "sdk", don't init ACRA.
Kevin