We actually wondered that too but it seems that its just the one arg constructor (the real constructor arguments are defined [here](https://github.com/android/platform_frameworks_base/blob/master/core/java/android/view/MenuInflater.java#L78) and the construction happens [here](https://github.com/android/platform_frameworks_base/blob/master/core/java/android/view/MenuInflater.java#L78)). 

I don't think you can specify layout attributes for an action view in a menu definition - just a class name as an attribute on the menu item node.